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HomeMy WebLinkAbout474 - Specifications 1 - Reinforced Concrete BridgesM RESOLUTION N0. 4 74-' A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF NEWPORT BEACH ADOPT- ING SPECIAL SPECIFICATIONS NO. 1 FOR THE CONSTRUCTION OF REINFORCED CONCRETE BRIDGES AND APPURTENANCES THERETO WITHIN SAID CITY• Be it resolved by the City Council of the City o:f Newport Beach that the following Specifications to be known as Special Specifications No. 1 for the Construction of Reinforced Concrete Bridges and Appur- tenances thereto in the City of Newport Beach, be and the same are hereby adopted. A& IWV :S r M RESOLUTION N0. 4 74-' A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF NEWPORT BEACH ADOPT- ING SPECIAL SPECIFICATIONS NO. 1 FOR THE CONSTRUCTION OF REINFORCED CONCRETE BRIDGES AND APPURTENANCES THERETO WITHIN SAID CITY• Be it resolved by the City Council of the City o:f Newport Beach that the following Specifications to be known as Special Specifications No. 1 for the Construction of Reinforced Concrete Bridges and Appur- tenances thereto in the City of Newport Beach, be and the same are hereby adopted. A& IWV :S f I N D E % 1. GENERAL REQUIREMENTS SECTION PAGE 1. Work and Plans 1 2. Examination of Ground 1 3. Suitable Appliances 1 4. Setting Stakes 1 5. Inspectors 1 6. Materials and Samples 1 7. Labor 2 8. Preservation of Monuments 2 9. Removing obstructions 2 10. Headers 2 11. Observing City Ordinances 2 12. Cross Streets 2 13. Barriers, Lights, Temporary Bridges, etc. 2 14. Public Utilities 2 15. Notice to Contractor 3 16. Defective Work 3 17. Loss or Damage 3 18, Variance of Quantities 3 19. Restoration of Streets and Sidewalks 3 20. Protection of Work and Cleaning up 3 21. Allowable Variation 3 22. Final Inspection 3 23. Fees and Royalties 4 24. Definitions 4 M ti II• REINFORCED CONCRETE BRIDGES AND APPURTENANCES SECTION 1. Grading 2 • laterials .3. Cement 4. Sand 5. Sand Specifications & Tests 6. Methods of Test 7. Gravel or Broken Stone for Concrete 8.' Poa Gravel for Concrete 9. Rattler Test 10. Reinforcing Stool 11. Water 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. U. 2.3 . 24. PAGE 5 5 5 -6 6 -7 7 7 -11 11 -12 12 13 13 -14 14 Proportioning Concrete Materials 14 -15 Weighing Materials 15 ifr. 15 -16 Consistency of Concrete II• REINFORCED CONCRETE BRIDGES AND APPURTENANCES SECTION 1. Grading 2 • laterials .3. Cement 4. Sand 5. Sand Specifications & Tests 6. Methods of Test 7. Gravel or Broken Stone for Concrete 8.' Poa Gravel for Concrete 9. Rattler Test 10. Reinforcing Stool 11. Water 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. U. 2.3 . 24. PAGE 5 5 5 -6 6 -7 7 7 -11 11 -12 12 13 13 -14 14 Proportioning Concrete Materials 14 -15 Weighing Materials 15 Mixing Concrete 15 -16 Consistency of Concrete 16 Tests of Concrete 16 Placing Concrete 16 -17 Placing Concrete under Water 17 Construction Methods 17 -18 Bonding 18 Curing 18 -19 Concrete Railings 19 Sidewalks on Bridges 19 Surface Finish 19 -20 ti S SCTION PAGE 25. Forms 20 -21 26. Falsowork 21 27. Reinforcement 21 -22 28. Expansion Joints 22 29. Concrete Piles 22 -23 30. Schlueter Interlocking Reinforced Concrete Sheet Piles 23 31. Concrete Steps & Landings 23 32. Concrete Pipe Drains 23 -24 33. Pipe Hand Rails 24 34. Expansion Details 24 35. Cement Concrete Pavement, Cement Concrete Sidewalks & Cement Concrete Curbs 24 36. Ornamental Lighting 26 37. Water Pipe Lines 26 38. Removal of Existing 'Ydooden Bridge 26 i . 1. GENERAL REQUIREMENTS - -000 -- SECTION 1: WORK AND PLANS: The Contractor shall, for the price bid; furnish all labor, materials and equipmdnt necessary to execute the work in every .respect, in a thorough, workmanlike manner in accordance with hi' .p'.ars, prof -les and specifications and to the satisfae tic.- :•i.' *`� ;.'aperintendent of Streets. All work shall., dosing ita progress and co its completion, conform to the lines, e_evatLon_ 0nd grades shown on said plans and pro- files: A copy of thu plans and specifications furnished by the City Engineer shall be kept upon the work at all times during its progress and access thereto Eha'.1 at all times be accorded the City Engineer or the Superintendent of Streets. SECTION 2: EXAMINATION OF GROUND Bidders must examine and judge for themselves as to the location of the proposed work, the nature of the excavation c0 be made an9 the work to be.done. The plans for the work will shcv+ conditions as they are supposed, or believed by the City Engineer to exist, but it is neither intended nor to be inferre9 that the conditions as shown thereon constitute a representation by tkio city or f1ts officers that such conditions are actually existent, nor shall the city or any of its officers be liable for any loss sustained by the Contractor as a result of any variance between conditions as shown on the plans and the ac- tual conditions revealed during the progress of the work or other- wise. SECTION 3: SUITABLE APPLIANCES: The Contractor shall use such methods and appliances for the performance of the work embraced under these specifications as will secure a satisfactory quality of work and rate of progress. SECTION 4: SETTING STAKES; Contractor shall give twenty —four 24 hours' notice in writing when he will require "the service of the City Engineer for laying out any portion.of the work. The Contractor shall dig all holes necessary for line and grade stakes, and shall preserve all stakes set for line, grades or measurements of the work in their proper places until authorized to remove them by the City Engineer. Any.expense incurred in replacing said Stakes: whirh the Contractor may have failed to preserve, shall be borne by the Contractor. SECTION 5: INSPECTORS: Tho Contractor shall prosecute the work only in the presence of an. inspector authorized by the Super- intendent of Streets and any work done in the absence of said inspector shall be subjert to rejection. The Contractor shall furnish the inspector, the Gity Engineer and the Superintendent of Streets reasonable facilities for obtaining full information respecting the progress and manner of the work and character of the materials. 1 r MATERIALS quality and AND SANiP.LES: fully equal All materials must be of to samples, where samples are required. The Contractor shall furnish to the City Engineer 1. GENERAL REQUIREMENTS - -000 -- SECTION 1: WORK AND PLANS: The Contractor shall, for the price bid; furnish all labor, materials and equipmdnt necessary to execute the work in every .respect, in a thorough, workmanlike manner in accordance with hi' .p'.ars, prof -les and specifications and to the satisfae tic.- :•i.' *`� ;.'aperintendent of Streets. All work shall., dosing ita progress and co its completion, conform to the lines, e_evatLon_ 0nd grades shown on said plans and pro- files: A copy of thu plans and specifications furnished by the City Engineer shall be kept upon the work at all times during its progress and access thereto Eha'.1 at all times be accorded the City Engineer or the Superintendent of Streets. SECTION 2: EXAMINATION OF GROUND Bidders must examine and judge for themselves as to the location of the proposed work, the nature of the excavation c0 be made an9 the work to be.done. The plans for the work will shcv+ conditions as they are supposed, or believed by the City Engineer to exist, but it is neither intended nor to be inferre9 that the conditions as shown thereon constitute a representation by tkio city or f1ts officers that such conditions are actually existent, nor shall the city or any of its officers be liable for any loss sustained by the Contractor as a result of any variance between conditions as shown on the plans and the ac- tual conditions revealed during the progress of the work or other- wise. SECTION 3: SUITABLE APPLIANCES: The Contractor shall use such methods and appliances for the performance of the work embraced under these specifications as will secure a satisfactory quality of work and rate of progress. SECTION 4: SETTING STAKES; Contractor shall give twenty —four 24 hours' notice in writing when he will require "the service of the City Engineer for laying out any portion.of the work. The Contractor shall dig all holes necessary for line and grade stakes, and shall preserve all stakes set for line, grades or measurements of the work in their proper places until authorized to remove them by the City Engineer. Any.expense incurred in replacing said Stakes: whirh the Contractor may have failed to preserve, shall be borne by the Contractor. SECTION 5: INSPECTORS: Tho Contractor shall prosecute the work only in the presence of an. inspector authorized by the Super- intendent of Streets and any work done in the absence of said inspector shall be subjert to rejection. The Contractor shall furnish the inspector, the Gity Engineer and the Superintendent of Streets reasonable facilities for obtaining full information respecting the progress and manner of the work and character of the materials. . 1— SECTION 6; specified MATERIALS quality and AND SANiP.LES: fully equal All materials must be of to samples, where samples are required. The Contractor shall furnish to the City Engineer for test, whenever requested and free of charge$ samples of all materials proposed to be used in the work. Rejected material must be immediately removed from the work by the Contractor and shall not be brought again upon the work. . 1— SECTION 7: LABOR: person employed on to perform the work charged immediately the work. 1 Any superintendent, foreman, laborer or other the work by the Contractor, who fails or refuses in the mariner specified herein, shall be dis- and such person shall rot again be employed on SECTION 8: PRESERVATION OF %iCT.T'1. ;EP ?TS:. T_ n 6ont actor shall not dis- turb any monuments or stakes Tound an t.ao p=r' aj the improvements without permission from tho Mty Ent.,inee_•. and. Lo shall bear the expense of resetting any monuments ur stakes which may be disturbed without permission SECTION 9: MOVING OBSTRUCTIONS: The Contractor shall remove trees where required by the plans of or where the proper completion of . the work requires their removal. The Contractor shall also remove all stone, debris or other obstructions, of whatever kind or char- acter, encountered in making the improvements. SECTION 10: HEADERS: Whenever thapavement to be laid does not terminate against a curb, gutter or other pavemont, the Contractor shall provide and set upon the line of termination a healer of sound plank, two (2) inches in thickness and of a. width not less than the thickness of the pavement. The top edge of the plank shall conform to the cross- section of the finished street. -Sail neaders shall be scinsidwro3 a iocessary part of the pavement ail shall rcnain in place when thu work is completed and accepted. SECTION 11: OBSERVING CITY ORDINANCES: The Contractor shall observe all the ordinances of the City of Newport Beach in relation to the obstruction of streets, keeping open passageways and protecting the same where they are exposed and would be dangerous to travel. SECTION 12: CROSS STREETS: No two consecutive cross streets shall be closed at any one time. SECTION 13; BARRIERS, LIGHTS, TEMPORM BRIDGES, ETC.: The Contractor shall erect ani keep erected, by night ail day, a fence or proper barrier along the line of the work and across the ends of the same in order to guard the public effectively from danger of falling into trenches or from upsetting their vehicles against the earth thrown up during the progress of the work, and he shall post all proper notices and signals to the public of the state of the streets while the work is in progress. A red light most be maintained at night at each end of the barrier from sunset until sunrise. He shall provide and maintain All necessary detours and temporary bridges.. SECTION 14; PUBLIC UTILITIES; In case it should be necessary to move the property of any owner of a public utility or franchise, such owner will, upon proper application by the Contractor, be notified by the Superintendent of Streets to move such property within a specified reasonable time, and the Contractor shall not interfere with said property until after the expiration of the time specified. The right is reserved to the owners of public utilities and franchises to enter upon the street for the purpose of making repairs or changes of their property made necessary by the work. The City of Newport Beach shall also have the privilege of entering upon the street for the purpose of repairing sewers, and water pipes, or making house connections therewith, or repairing culverts or storm drains. -2- SECTION 15: NOTICE TO CONTRACTOR: Notice of any imperfections in the work to any foreman or agent in charge of any portion of the work, in the absence of the Contractor, shall be considered as notice to the Contractor. SECTION 16:. DEFECTIVE WORK:. No work which is defective in its construction.or deficient.in any of the requirements of these specifications will be considered as eccepted in consequence of the failure of any officer of the city or in.spector.connected With the work, to point out said defects or deficiency during construction. The Contractor shall correct any imperfect work, whenever discovered, before the final acceptance of the work. SECTION 17: LOSS OR DAMAGE: All loss or damage arising from any unforseen obstruction or difficulties which may be encountered. in the prosecution of the work or from any action of the elements prior to the acceptance of the work,.or from any act or omission not authorized by these specifications, on the part of the Con —. tractor or any agent or person employed by him, shall be sustained by the Contractor. SECTION 18: VARIANCE OF QUANTITIES:. The Contractor assumes all risk of variance in any computation or statement of amounts of quantities necessary to complete the work required by the contract and agrees to furnish all necessary labor and.materials to fully. complete said work in accordance with.the plans and specifications and to the satisfaction of the Superintendent of Streets. SECTION 19: RESI.TORATION OF STREETS AND SIDEWALKS. Where trenches are excavated in streets which,are paved; macadamized, oiled or otherwise improved, the pavement or surface thus removed shall be replaced by the Contractor in a,workmanlike manner and in ac- cordance with the specifications under which the :street was originally improved. Unless.ptherwise provided, the Contractor shall re- place and repair any damage to sidewalks, cross — walks, curbs and gutters resulting from trench excavation prior to the acceptance of the work. SECTION 20: PROTECTION OF.WORK AND CLEANING UP: The Contractor shall care for all work until final completion an8, acceptance of the whole. All damage done to existing improveme.t5 by the Con- tractor shall be repaired by him. He shall remove all..surplus material and rubbish from the work after its completion and be- fore he makes application for the acceptance of the work. SECTION 21: ALLOWABLE VARIATION: When, in these specifications, a maximum.of minimum, either in size, percentage or thickness, or relating to quality or character or other matter, is.allowed or proscribed, the work shall be accepted as in compliance there- with if within such maximum or minimum so allowed. SECTION 22:.FINAL INSPECTION:. The Contractor shall:notify the Superintendent of Streets when he.desires a final inspection of the work. The Superintendent of Streets will as soon thereafter as possible make the necessary examination.. If the work is found to be in compliance With these_ specifications, the Superintendent of Streets will furnish the Contractor with a certificate t0 that effect. —3— 00 SECTION 23: FEES AND ROYALTIES. All fees or royalties for any patented invention, article or arraneemrait in any manner connected with the work, or with these specifications, stall be included in the price stated in the proposal, and tno C.L.,ractor shall protect and hold the City harmless against -11y and ail 3eman3s or claims for such fees or royalties, whether such 3eman3s or claimsare filed luring the life of the contract or after its completioni SECTION 24: DEFINITIONS: whenover the word "City" is usoi in the specifications, it refers to the Cite of Newport Beach, California. Whenavor the word "Contractor" is usoi in the specifi- cations, it refers to the party or parties of the seconi part in the agreement for the construction of the work herein specified. Whenever the words "Superintendent of Streets" and "City Engineer" are used in the specifications, they refer, respectively, to the Superintendent of Streets and the City En- gineer of the City of Newport Beach, California, or their authorized agents_ or inspectors. m II.REINFORCED CONCRETE BRIDGE AND APPURTENANCES SECTION 1: GRADING. Grading shall include all filling, the removal of all earth', sand, stone or other material of whatever nature it may be that may be encountered in preparing the foundations for pile bents, abutments, rally; etc,.. and. Fha'� also include all trimming and shaping requiree. to ';ring the .'. -11 or excavation, as the case may be, tc grace and sei;y.ion� When mud or other soft material is encoun-i ored '_.t shailbe ta'ier_ out and the space filled with good earth, sand or gravel, which; if it is earth.or gravel shall be either rolled or tamped until the surface of the foundation is firm and unyielding: The Contractor, however, will not be required in such cases to excavate mud or other soft mate- rial to a depth greater than five (6) foot below the sub -grade of the foundation for walls, abutments, pile bents, otc. All filling shall be done with good sound earth, gravel or sand. Whenever a fill is to be made of earth or gravel the om- bankment shall be brought up in layers not exceeding six (6) inches in depth, and each layer thoroughly dampened and rolled or tamped until it is firmly compacted. When the fill is made with sand it shall be brought up to grade and thoroughly dampened and compacted. No material of a perishable, spongy or otherwise improper nature shall be used in filling. The space over which fills are to be made shall first be cleared of all brush, timber, trash or other debris unfit for foundation. The Contractor shall notify the Engineer when any portion of the work has boar brought to sub -grade when the latter will check the elevations of the same, and if the work is found to be in accordance with the specifications and grades liven, the Contractor shall proceed as hereinafter mentioned. SECTION 2: MATERIALS FOR REINFORCED CONCRETE. All materials in -, eluding cement, sand pea gravel, gravel, broken stone, reinforcing steel, water, etc., shall conform to the following specifications: SECTION 3: CEMENT. All cement shall be Portland Cement, and must conform to the following requirements and be subject to the follow- ing tests, which will be open to the Contractor and will be made by the methods and under the conditions prescribed in Specifications C -9 -17, adopted by the American Society for Testing Materials in 1916. (a) CONSISTENCY. All cement for set tests, test pats, and neat briquettes will be mixed with sufficient water to reduce the cement to normal consistency, as proscribed by the Specifications of the American Society for Testing Materials, hcreinbeforo referred to. Neat briquettes will be compacted by light tamping. Mortar . briquettes shall be mixed to a state of plasticity corresponding as nearly as possible to normal consistency in neat briquettes• c f (b) FINENESS: The cement must be evenly ground, and when tested with the following standard sieves, must pass at least the follow- ing percentages of weight: No. 100 Sieve, having 100 meshes per lineal inch - 92 per cent. No. 200 Sieve, having 200 meshes per lineal inch - 75 per cent. (c) TIME OF SETTING: It shall develop initial set in not less than one hour, nor more than ten hours. -5- (d) TENSILE STRENGTH: Neat briquettes one inch square in section shall attain a minimum strength as follows: At 24 hours in moist air - 175 lbs. At 7 days (1 day in moist air ani six in water) - 500 pounis. At 28 days (1 any i.-Li mol_st air ar_:t 25' Says in water) - 600 pounis. Briquettes one inch square in section, made of one part of cement, three parts of standari testing sans, shall attain a minimum strength as follows: I At 7 days (1 iay in moist air ani 6 days in water) 200 pounis. At 28 iays (1 iay in moist air ani 27 says in water) 275 pounis. The sans test must in all cases shod an Increase in strength at 28 iays over the 7 -lay tests. (e) SOUNDNESS: Pats of neat cement about three inches in iiameter, one -half inch thick at the center, ani tapering to a thin edge, will be kept,in moist air for a porioi of 24 hours. A pat will then be kept in air at normal temperature ani observed at intervals for at least 28 iays. Another pat will, after having been kept 24 hours.al. moist air, be placei in water at normal temperature ani maintained for throe hours. These pats, to satisfactorily pass the requirements, must remain firm ani hart, ani must not show any'sigm of iis- tortion, checking, cracking, blotching or iisintegrating. ('f) PROTECTION: All cement storei must be protectei from the weather ani be ieliverei to the work in the original package of the manufacturer. No cement shall be usei which has boon mixe93 in any way with another brani or quality of cement or which has boon tampered with in any way after being: placei in the original package of the manufacturer, nor shall any cement be usei from packages containing lumpy cement or which has been rogrouni. SECTION 4: SAND. DEFINITION OF ShND: The fine, granular material naturally or artificially proiucei by'tho'iisintotration or erosion of rock. SPECIFICATIONS AND TESTS FOR SAND TO BE USED IN CONCRETE. 1. OIL• Sani shall be free from oil. 2e ORGANIC MaTTER•' Sani, when testei in accoriance with Niotho.i of Test hereinafter iescribei, shall not show'a solutim color iarker than the staniari color solution. -6- Q 3. STRENGTH. Sant, when testei in accordance with Methoi of Tost hereinafter iescribed, shall not show comprossivo strength at the age of seven (7) iays. less than that of Ottawa Staniard ir Sani, similarly testei. 4. WASHING. Sani shall be thoroughly ani uniformly washed. After washing, sani, when tested i.n accordance with Methoi of Test v/ hereinafter iescribei, shall not conta'_n more than three (3) per cent, by weight, of silt, loam, clay, etc. 5. SIEVE ANALYSIS. Sani, when testei in accoriance with Methoi of Test hereinaftor iescribei, shallconform to the follow- ing sieve analysis, by woight. (a), Not more than five (5) per silt, loam, clay, etc., determined shall pass a No. 100 sieve. cent minus the per cent of above (Paragraph 4, "Washing ") (b) Not less than twenty (20) per cent and not more than fifty (50) per cent shall pass a No. 30 sieve. (c) Not less than ninety —five (95) per cent shall pass a No. 4 sieve. SECTION 5: FOR SAND TO BE 1. OIL. Sani shall be free from oil. 2. ORGANIC IVLTTER, Sani, when tested in accoriance with Methoi of Test hereinafter iescribei, shall not show a solution color iarker than the Staniari color solution. 3. STRENGTH. Sani. when tested in accordance with Methoi of Test hereinafter iescribei, shall not show compressive strength at the age of seven (7) days less than that of Ottawa Staniari Sand similarly tested. 4. WASHING. Sand shall be thoroughly and uniformly washed. After washing, sand, when tested in accordance with Method of Test, hereinafter described,'shall not contain more than three (3) per cent by weight of silt, loam, clay, etc. 5. SIEVE ANALYSIS. Sand when tested in accordance with Method of Test hereinafter described. shall conform to the follow- ing analysis by weight. A. Not more than six (6) per cent minus the per cent of silt, loam, clay, etc. determined above (Paragraph 4, "Washing ") shall pass a No. 100 Sieve. B. Not less than seventeen (17) per cent and not more than forty —two (42) per cent shall pass a No. 30 sieve. C. All shall pass a No. 4 sieve. SECTION 6: METHODS OF TEST. A. Method of Test for Organic Impurities. 1. a A representative test sample of sand of about 1 lb. shall be obtained by quartering or by the use of a sampler. (b) A 12 oz. graduated glass prescription bottle shall be filled to the 4 1(2 oz. mark with the sand to be tested. —7— (c) A 3 per cent solution of sodium hydroxide (NaOH) in water shall be added until the volume of sand and liquid, after shaking, Eives a total value of 7 liquid ounces. ,(d) The bottle shall be stoppered and shaken thoroughly and then allowed to stand for 24 hours. (e) A standard color solat;.Ld -,hall be prepared by adding 2.5 cc. of a 2 per cent solution o1 tannic ac .d in 10 p-ur cent alcohol to 22.5 cc. of a 3 per cent sodium hydroxide.solution. This shall be placed in a 12 oz. prescription bottle, stoppered and allowed to stand for 24 hours, then 25 cc. of water added. (f) The color of the clear liquid above the sand shall be compared with the standard color solution prepared as in paragraph (c) or with a glass of color similar to the Standard Solution. 2. Solutions darker than the standard color have a "Color Value" higher than 250 parts par million in terms of tannic acid. B. Method of Test for strength. Both.concrote sand and Ottawa Standard Sand (the latter as hereinbolow described and defined) shall be made into mortar composed of ono (1) part by weight of Portland Cement, and two (2) parts by weight of sand. The consistency of the mortar made with concrete sand shall be the same as that of the mortar made with Ottawa Standard Sand. All mortar test specimens shall be made, stored and tested as hereinafter described. MIXING CEMENT MORTAR. 1. The quantity of dry matoriadl to be mitred at one time shall not oxcoed 1000,.g; nor be loss.thdn`500 g; The proportions of cement, or,cement aril sand, shall to stated by weight;in grams of the dry materials; the quantity . of iater -slid be exprCssed in cubic contimeters (1 cci of.water — on© g.). The dry materials shall be weighed, placed upon a non absorbent-s�irfaco, thoroughly mixed dry if sans is used, and a crater formal in; the Center; into which the proper percentage of cioan watur.A all be poured; the material on the outer eige shall be turned into the orator by the aii of a trowel, After an interval of 1/2 .&inut© for the ab- sorption of the water, the operation shall be complete.i by con- tinuous, vigorous mixing; squeezing ani kneading with the hams for at least one minute. During the operation of nixing, the hands should be protectai by rubber gloves. In or.lor to secure uniformity in the results of tests for compression strength, the manner of mixing above iescribei should be carefully followei. At least one minute is necessary to obtain the desirei plasticity which is not appreciably affected by con= tinuing the mixing for several minutes: The exact time necessary is iepenient upon the porsonal equation of the operator: The error in mixing should be on the siie.of over — mixing. 2.. The tomporaturo of the room atii the mixing water shall be maintainoi; as nearly as practicable, at 21 degrees c. (700 F.). Consistency of Mortar. Fourteen per cent (141o) of water shall be uses with Ottawa Stanlari Sani. To obtain the same consistency with the concrete sand, a metal truncated cono four inches (4 ") in groatest diameter, two inches (29 in smallest diameter, and six inches (69 high, shall be used. The consistency of the aonurat: van3 mortar and that of the Ottawa Standard Sand mortar shall bo considered the some when their respective slumps, made as above, are equal. Compression Tests. 1. A cylindrical test piece 2 in. in diameter and 4 in. in length is recommended for use in making compression tests of standard mortars. The molds shall be made of non- corroding metal. A satisfactory form of mold is shown in Fig. 1, page 134, of A.S.T.M. 1924 book of Tentative Standards. The ends of the mold . shall ba parallel. The tubing used K the molds shall be of sufficient thickness to prevent appreciable distortion. The molds shall be oiled before using. During the molding of the piece, the mold shall rest on a clean, plane surface (preferably a piece of plate glass which is allowed to romain in place until the mold is removed). 2. The said to be used shall be natural said from Ottawa, Ill., screened to pass a No. 20 sieve and rotainned on a No. 30 sieve. This sand may bo obtained from the Ottawa Silicia Co., at a cost of three cents per pound, f.o.b. cars, Ottawa, Ill. 3. The sand, having passed the No. 20 sieve, shall be considered standard when not more than 5 g. passes the No. 30 sieve after one minute continuous sieving of a 500 -14 sample. tions: 4. The sieves shall conform to the following specifica- The No. 20 sieve shall have betwoen 19.5 and.20.5 wires per whole inch of the warp wires, and between 19 and 21 wires per whole inch of the shoot wires. The diameter of the :mire should be 0.0165 U. and the average diameter shall not be outside the limits of 0.0160 and 0.0170 in. The No, 30 sieve shall have between 29.5 and 30.5 wires per whole inch of the warp wires and between 28:5 and 31:5 *mires per whole inch of the shoot wires. The diameter of tho wire should be 0.011 in. and the average diameter shall not be outside the limits 0.0105 to 0.0115 in. 5. The mortar shall be placed in the mold in layers about 1 in. in thickness; each layer being tamped by means of the steel tamper shown in Fig. 2, page 134, of A.S.T.NI. 1924, Book of Ten - tativo Standards. The weight of tamper shall be approximately 3(4 lb. In finishing the test piece, the mortar shall be heaped above the mold and smoothed off witha trowel. As soon as the test pioces from one sample are molded, the top of each test piece shall be covered with a piece of glass which is brought to a fin= bearing on the fresh mortar. The cover glasses shall remain in place until molds are removed. 6. Tests of standard mortar cyliniers shall bo made in any testing machine which is adapted to meet the specifi$droquire- �� Monts. The test pieces shall be tested as soon as removed from the water. The ends of the test cyliniers shall be smooth plane surfaced. The metal bearing plates of the testing machine shall be placed in iirect contact with the ends of the test piece. During the test a spherical bearing :lock shall be used on top of the cylinder- QM F >` In order to securo a uniform iistribution of the load ov0r the test cylinder the spherical boaring block must bo accurately contered. The diameter of tho spherical bearing block shouli be only a little greater than that of the test piece. The test piece shall be loaded continuously to failure. The movinc- head of the testing machine shall travel at the rate of jot less than 0.05 or more than Or10 in. per minute. 7. Testing machines should be frequently calibrated in orier to determine their accuracy. B. Cyliniers that are manifestly faulty, or which give strengths iiffering more than 15 per cent from the avrrage value of all test pieces testoi at the same period ani maie from the same sample, shall not be considered in ietermining the compressive strength. Storag,e of Test Pieces. 1. The moist closet may consist of a saapstone, slate or concrete box, or a wooden box lined with metal. If a wooden box is used, the interior should be covered with felt or broad wickering kept wet. The bottom of the moist closet should be covered with water. The interior of the closet should be provided with non- absorbent .shelves on which to place the test pieces, the shelves being so arranged that they may be withdrawn readily. 2. All test pieces, immediately after molding, shall be placed in the moist closet for from 20 to 24 hours. 3. The briquettes shall be kept in molds on glass plates in the moist closet for at least 20 hours. After from 20 to 24 hours in moist air the briquettes shall be immersed in clean water in.storage tanks of non- corroding material. 4. The air and water shall be maintained as nearly as practicable at a temperature of 21 degrees C. (70 degreos F.). C. Method of Tost for Decantation. 1. This method of test covers the determination of the total quantity of silt, loam, clay, etc., in sand and other fine aggregates. 2. The pan or vossel to bo used in the determination shall be approximately 9 in. (230 mm.) in diameter and not loss than 4 in. (102 mm.) in depth. .3. The sample must contain sufficient moisture to prevent segregation and shall bo thoroughly mixed. A representative portion of the sample sufficient' to yield approximately 500 g. of dried material shall then be driod to a constant weight at a temperature not exceeding 100 C (230 degrees F). 4. The dried material shall be placed in the ppan and sif - ficient orator added to cover the sample (about 225 cc.). The contents of the pan shall be agitated vigorously for l5 seconds, and then be allowed to settle for 15 seconds, after which the water shall be poured off, care being takon not to poor off any sand. This operation shall be repeated until the was4 water is �r clear. As a precuation, the wash water shall be poured through a 200 -mesh sieve and any material retained thereon returned to the washed sample. The washed sand shall be dried to.a constant weight at a temperature not exceeding 100 degrees C. (230 degrees F) and weighed.. 5? The results shall be calculated from the formula: Percentage of silt, clay, loam, etc., Original dry weight after washing % 100 Original dry weight. -10- 6. When check determinations are desired, the wash water shall be evaporated to dryness•, the residue weighed, and the per- centage calculated from the formula: Vieight of residue x 103 Percentage of silt, loam, clay, etc. - - Or;.gi.nal dry weight. D. Method of Test for Sieve Analysis. 1. A representative test sample of the aggregate shall be selected by quartering or by use of a, sampler, which after drying will give not less than the following: (a) Fine aggregate, 500 g. b Coarse aggregate or.a mixture of fine and coarse aggregates, weight iii grams, 3000 times -size of largest sieve required, measured in inches. TABLE 2. Sieve Opening Wire Diam. Tolerance Der cent Sieve Wire Max. No. or Avg. Diam. imum Size in opng. Uni. Over Open- No. 100 0.149 0.0059 0. 102 0.0040 6 15 35 40 No. 30 0.59 0.0232 0. 33 0.0130 5 15 30 25 No. ' 4 4.76. 0.187 1. 27 0.050 3 15 30 10 No. 3 6.680 0.263 1. 78 0.070 3 15 30 10 3/8 in. 9..5 0.375 2. 33 0.092 3 10 10 10 2. The sample shall be dried at not over 110 degrees C (230 degrees F) to constant weight. .3. (a The sieves shall be of square -mesh wire -cloth and shall be mounted on substantial frames constructed in a manner that will prevent loss of material during sifting. (b) The size of wire and sieve openings shall be as given in Table 2. 4.. (a) The sample shall be separated into a series of sizes by means of the sieves specified in Paragraph 3 above. Sifting shall be continued until not more than one (1) per cent by weight of the sample passes any sieve during one (1) minute. (b) Each size shall be weighed on a balance or $cale which is sensitive to 1 /1000 of the weight of the test sample. (c) The percentage by weight of the total sample which is finer than each of the sieves shall be computed. 5. (a) The percentages in sieve analysis shall be re- ported to the nearest whole number. SECTION 7: GRAVEL OR BROKEN STONE FOR CONCRETE. Coarse aggregate shall be sound crushed rock, broken stone or washed gravel, or combination of both. The particles of coarse aggregate shall be of clean, hard, tough, durable material free from vegetable or other -deleterious substances. It shall be free from dirt, mud or stone dust. Coarse aggregate, as furnished, shall be uniformly graied from the largest to the smallest screen sizes given below, ani in addition shall conform to the following tests: -11- GRADING. When analyzed by laboratory screens and sieves coarse aggregate for use in cement concrete work shall conform to grading requirements, as follows: (a) All shall pass a screen having two (2) inch square openings. (b) ]jot less than ninety -five (95) per cent, by weight, shall .pass a screen having 1 1/2" square openings. (c) Not less than thirty -five (36) per cent and not more than sixty (60) per cent, by weight,shall be retained on a screen having 3/411 square - openings. •(d) Not more than five (5) per cent, by weight, shall pass a screen having 3/8" square openings. (e) Coarse aggregate for concrete piling shall conform to grading requirements as follows: (a) All shall pass a screen having one and one -half (1j) inch square openings. (b) Not less than ninety -five (95) per cent, by weight, shall pass a screen having one i_rich square openings. (c) Not less than fifty -five (55) per cent and not more than eighty -five (85) per cent, b weight, shall be retained on a screen having three- fourtl_c N 4ths) inch square openings. (d) Not more than fi76 (5) per cent, by weight, shall pass a screen having three- eighths (3 /8ths) inch square openings. (e) All shall be retained on a four -mesh sieve. Coarse aggregate for concrete railing shall conform to the grading requirements as follows. All shall pass a one -half (1/2) inch square opening and twenty -five (25) per cent be retained on a one - quarter (1/4) inch square opening. Gravel shall not show a loss of more than thirty -two (32) per cent and broken stone shall not show a loss of more than twenty -two (22) per cent when subjected to the rattler test here- inafter specified. PEA GRAVEL FOR CONCRETE. Pea gravel shall be sound, washed gravel, clean, hard, tough, durable material free from vegetable or other deleterious substances. It shall be free from dirt, mud or stone dust. Pea gravel as furnished shall be uniformly graded from the largest to the smallest screen or sieve sizes given below, and in addition shall conform to the following tests: GRADING. When analyzed by laboratory screens and sieves pea gravel for use in cement concrete work shall conform to grading require- ments, as.follows: (a) All shall pass a screen having 1/2 inch square openings. -12- _o NWF 0 :, (b) Not less than 95 per cent, by weight, shall pass a scxe en having 3/8 inch square openings. (c) Not less than 40 per cent, and not pure than 60 per cent by weight, -shall be retainee. on :. 4-mesr. :'.: !Aaving square openings. (d) Not more than 10 por cent, by reight, shall pass a 14-m esh sieve with square openings. Pea gravel shall not show a loss of more than 32 per cent when subjected to tho rattler test hereinafter specified. SECTION 9: RATTLER TEST. At least thirty (30) pounds of the material to be tested shall be available for the tost. Each sample when ready for the rattler shall consist of five (5) kilograms (elevon pounds) of said material, and shall pass a two anft one -half inch scroen, sixty per cent, by weight, shall be retained on a three- quarter inch screen, and all shall be rotained•on a one -half inch screen. The s ^.id sample shall be tested in a rattler consisting of a metal cylinder 28 inches in diameter and twdnty inches in length, longitudinally mounted on a horizontal shaft and having a shelf four inches wide extending from end to end. During the test the "zattler"shall be revolved at a rate of between 28 and 30 revolutions per mi. uto. A charge for the rattler shall consist of the °aid five kilograms sample and fourteen' cubical blocks of east iron with rounded corners and edges, said ::locks measuring about one and one -half inches in each dimension and having a weight of five kilograms. After re- ceiving the charge, the rattler shall be given five hundred revolutions. The sample shall.thon bo screened and the portion, by weight, which will pass a 10 -mush screen, which shall be considered and designated as the loss. SECTION 10: REINFORCING STEEL. Steel. shall be made by the open hearth process and shall be of uniform quality. It shall contain not more than five - hundredths (.05) per cent sulphur; if made by the acid process it shall contain not more than six hundredths (.06) per cent phosphorus, and if made by the basic process not more than four - hundredths (.04) por cent phosphorus. When tested in specimens of standard form, or full sized pieces, of the same length, it shall have an ultimate tensile strength of fifty -five thousand (55,000) to seventy thousand (70,000) pounds per square inch; an elastic limit of not less than one -half (1/2) the ultimate strength, and a minimum percentage of elongation in eight (8) inches of one million two hundred and fifty thousand (1,250,000) divided by the ultimate strength. Test specimens shall bond cold through one hundred and eighty (180) dogreos around a pin without cracking on the outside of the bent portion, the diameter of the pin being equal to the thickness of the specimen if less than three - quarter (3/4) inch, and being twice the thickness of the specimen if three- quarter (3/4) inch or larger. -13- Reinforcing bars shall be free from flaws, cracks, mill 40 scale, oil or paint. All reinforcing bars shall be square deformed bars unless othorwiso specified. SECTION 11: ryiHTER. relater shall be clean, f-reo from oil, acid-, alkali or vegetable matter. SECTION 12: PROPORTIONING CONCRETE MATERI: -LS. All cemont concrete shall be composed of the following materials ani in the following proportions; One (1) sack of cement weighing ninety -four (94) pounis, net, to five hunired thirty -five t5.35) pounis of mixei aggregate, by weight, except as herein otherwise provided, and not less than six (6) and not more than 6.3 gallons of water, which includes water or moisture contained in the aggregate. The mixed aggregate shall be composed of a combination of ti7o hunirei forty (240) pounds of gravel or broken stono aril 295 pounis of sans and pea gravel, except as heroin otherwise proviaei. The percentage by woight of sans and pea gravel shall be 3etorminoi by tho follow- ing formulas:. C = 100 (A- 3.90) D = 100 - C where A is the fineness modulus of the pea gravel B is the fineness modulus of the sand C is the percentage of sand; by weight D is the percentage of pea gravel, by woight The fineness modulus of the sans and the pea gravel shall be doterminoi by a sieve analysis using the following sizes of Stairiard Sieves with square openinl,°s. 100 -mesh, 50 -mesh, 30 -mesh, 14- mosh., 8 -mesh 4 -mesh; 3 /811- mos.h, 3/4" -mash, and 1- l /21� -nesh, The sum of the percontages of material, by weight, of the. sample coarser than each of the respective sizes of the Standard Sieves horeinbefore mentioned diviiei by 100 is the fineness mod- ulus of the material. The weights herein specified are for dry sans, pea gravel and gravel or broken stone. Provides any moisture is contained in sail materials, the woieht thereof must be deducted in order to obtain the weights a'zvo specified for dry materials. -14- The weights above -specified for sand, pea gravel and gravel or broken stone are based upon a minimum specific gravity of 2.67 and a maximum of 2.69. To determine the weights of aggregate for the concrete mix when the specific gravity of the aggregate is different than the values mentioned, multiply the weights of aggregate above specified by the value "F" given in the following Table opposite the specific gravity of the aggregate: Specific Gravity Value of. of 4�9xe� ate F 2:59 to 2.61 0. 970 2.61 to 2.63 0. 978 2.63 to 2.65 0. 985 2.65 to 2.67 0. 992 2.67 to 2.69 1. 00 2 :69 to 2.71 1. 008 2.71 to 2.73 1. 015 2.73 to 2.75 1. 023 The volume of cement for each cubic yard of concrete in place, when proportioned as above specified, shall not be less than 5.90 cubic feet, or more than 6.10 cubic feet. A cubic foot of cement shall be considered as having a weight of 94 pounds. SECTION 13: WEIGHING MATERIALS. The sand, pea gravel and the gravel or broken stone shall.be kept in separate bins, compartments or piles, and all of said materials shall be carefully weighed in the proportions spa cified by means of multiple beam or dial scales. The scales shall be set so that the gradings as actually obtained shall not be below the minimum nor above the maximum percentages herein specified. Cement in sacks as above specified shall be dumped directly in the mixer. The water necessary for each batch shall be accurately measured with an apparatus which will prevent the use of more water than herein specified. No mixer shall be used which is not provided with an accurate water measuring device or apparatus. SECTION 14: MIXING CONCRETE. All mixing of concrete for the pavement shall be done in a batch mixer, equipped with a batch meter. The mixer shall be chargod with. cement and sufficient sand, pea gravel and gravel or broken stone to conform to the proportions hereinbefore stated. Sufficient water, not in excess of the quantity above specified, shall be added to produce a plastic or quaking concrete which can be handled without causing a separation of the coarso aggregate from the mortar. The mixer drum shall have a speed of not less than 13 revolutions por minute, and every batch of concrete shall be mixed in the drum of the mixer not less than one and one -half minutes before any por- tion of the batch is discharged from the said drum., At least soventy -five (75).soconds'.must olapse'butwoen the placing of successive batches in the mixer. -15- SECTION 16: CONSISTENCY OF CONCRETE. • The concrete, after boing mixed as hereinbefore specified, shall, when subjected to the following test, have a slump of not loss than eight (8) per cunt, nor more than twenty (201 per cent. The slump test shall be made in the Following manner: Thu test tube to be used in making the slump test shall have an inside diameter of eight (8) inches at the base and an inside diameter of four (4) inches at the top, and a perpendicular height of twelvo (12) inches. Immediately after the concrete has boon mixed and deposited on the sub - grade, a sufficient quantity thereof shall be placed in four layers in the taporod test tube until the concrete is flush with the top of the tube, each layer shall be thoroughly settled by working with a pointed iron rod. Then the test tube shall be lifted, allowing the concrete to settle or slump. After the pile of concrete has set one (1) minute, its height shall be measured ani subtracted from the original height of twelve (12) inches, which difference in1might is the amount of the slump in inches from which the percentage of slump shall be determined. SECTION 16: TESTS OF CONCRETE. The concrete composed of the materials, proportions, coir- sistency, mixing, etc., provided for in those specifications, must be of such quality and character of workmanship that it will have an ultimate compressive strength of not less than 3,000 pounds per square inch, or an +zltimste modulus ci rupture of not less than 600 pounds per square inch. The test specimen for determining compressive strength shall "consist of a cylinder of the concrete to be tested six (6) inches in diameter, and twelve (12) inches in height. The test specimen for determining modulus of rupture shall consist of a beam of the concrete to be tested, six '�6) inches in width, six (6) inches in thickness and thirty -six ( 756) inches in length. Samples of the concrete to be tested shall be taken im- mediately after the concrete has left the mixer and deposited on the sub -grade and moldel into the test specimens,above mentionel. The concrete shall be thoroughly roiled ani care taken to remove air pockets. The freshly made test specimen shall be struck off and troweled level with the top of the mold. The test specimen, after molding, shall be covered to protect same from injury, and buried in damp sand, ani at the end of forty -eight (48) hours the moll shall be.removod and the test specimen covered with sand or earth aril maintained in a continuous lamp condition for a period of ten (10) days. At the eni of twelve (12) days from the lay of molling tho specimen, it shall be uncovered and air -cures for sixteen (16) lays, ani tostel at the eni of twenty -eight (28) days. PLACING CONCRETE SECTION 17: PLACING. All concrete shall be placed while fresh ani before it has taken an initial set. Retempering, with aiiitional water, any concrete that has partially hardened, shall not be permitted. -16- r .� Concrete shall, when practicable, be spread in horizontal layers. Coraparatively +vet mixture shall be puddled or joggled with proper tools to reovo all air bubles ani secure good contact with the reinforcement. Enough men shall be employed tamping and pudiling so that each batch shall be compactei before another is dumped in the form. The portions next all outside faces shall be cut.in by spades or wedge—shaped tampers to secure a smooth ex- ternal surface composed of the mortar of the concrete.. Special care must be taken to thoroughly remove all laitance and to roughen surfaces of concrete by picking before again pouring at joints. For all concrete this cleaning and roughening must be done - to the satisfaction of the Engineer, and as much of the concrete removed by picking, etc., as may be required by him to insure that fresh,concrete may be deposited upon sound concrete surfaces and that no laitance is suffered to remain. Layers of concrete must not be tapered off in wedge — shaped slopes, but must be built with square ends and level tops. Concrete, when mixed,, shall be immediately deposited with- out any separation of its ingredionts and thoroughly rammed and tamped or Spaded in layers not more than six inches (6 ") in depth, until it is thoroughly compact and until free mortar appears on the surface and all voids are filled. It shall not beopermitted to fall from any considerable height. The.use of chutes in conveying or depositing concrete will be allowed only at the discretion of the Engineer,.and wherever they are used, they must be laid at such inclination as will permit the flow of concrete of such consis prcy as is required. The use of additional water in mix.ng -;h_e cuncrete to promote free flow in chutes of low inclination viii rot be allowed. ' SECTION 18; CONCRETE DEPOSITED UNDER WATER. Concrete shall not b� deposited under water except by permission of the Engineer- All portions of the structu e for which concrete must be deposited under water shall be. poured continuously until completed; when such portions are completed, all scam, laitance and sediment must be removed before fresh concrete is deposited- Concrete must not be placed in running water. SECTION 19; CONSTRUCTION METHODS. The concrete in each integral part of the structure shall be placed continuously, and the Contractor will not be allowed to commence work on any such part unloss his inspected and approved material on hand and his force are sufficient to complete the part without interruption in the placing of'the concrete - Joints in the concrete due to stopping work are to be avoided as far as possible, except where indicated.on the plans- Such joints, when necessary, shall be horizontal in walls and columns, and shall in general-. be at the tops and bottoms of columns. Spans consisting of slabs and girders shall be poured continuously in one operation unless otherwise specified. An application of form oil sufficient to prevent bondingof concrete surfaces shall be applied to the ends of floor slabs, girders, curbs and posts where construction joints over piers and bents are indicated on the plans. —17— rs 1P The surface of the floor slab shall be finished true to -ilesk grade and cross- section by thorough tamping until the mortar fluhhes freely to the surface. The templet and tamper boards.shall at fre- quent intervals of time be teste.l for shape. After tamping, a straightedge approximately twelve feet (121) in length with a troweling or smoothing surface nine inches (9 "). in width, shall be used with its length parallel to the ^enter line of the pavement and operated from bridges with a combined longitudinal and trans- verse motion, planing off the high places and filling in the de- pressions. The surface of the concrete shall be finally finished smooth and true to grade with a canvas belt or trowel,_ as the Engineer may direct. When a straightedge ten feet (101) long is laid on the finished surface of the slab, and parallil with the line of the read, the surface shall in no place vary more than one - quarter inch (4 ") from the lower edge of the straightedge. Upon completion of the concrete slabs, should it be found that the surface does not conform to the above requirement, the high points shall be reduced to the one - quarter (4 ") inch allowable variation by bush• - hammering or by use of carborundum stones, the ark to be carried out to the satisfaction of the Engineer. SECTION 20: BCNDING. When joining . now concrete with concrete already set, the surface shall be cleaned, roughened, thoroughly watered and coated with a -chin mortar, composed of neat cement, All laltance shall be thoroughly romovaa to sound conartans oaloro aeposi.ting new concrete. To socur. a a bond betdoon v ni tied or inclined surfaces of concrete placed on different days, grooves shall be formed in the older work by nailing to tho Toro planks not less than eight inches (8 ") wide and three inches 3'') chick beveled at the edges and ends to facilitate removal. These planks shall be placed as directed, and shall in general cover a spaie equal to about one - third (1/3) of the aren to be bonjoa, Where in the opinion ct the :engineer a better bond between the old and new work is necessary chaa can be secured by the above methods, shor+ rods shall bo embedded in the older work for one - half (112) their length, as directed, and projecting ends bent into a hook aster removal of the Terms. SECTION 21: CURING. During the first ton (10) days after placing, the concrete shall be kept wet and protected against injury until it is thor- oughly Get. Fresh concrete on the floor slabs shall be covered with heavy burlap laid directly on tha.pavenent. This burlap covering shall, as soon as placed, be sprinkled with water by means of an adjustable garden hoso nozzle, so adjusted that it will spray, and it shall be kept wet until •removei. The Contractor shall pro? ido sufficient burlap to cover the maximum amain*•, of pavement lai? in one (1) day's run. This burlap shall be used exclusively for covering pavement and shall be replaced by now burlap when badly deteriorated. SOMM After the floor slab has set sufficiently so that the -` earth will not become incorporated in the surface of the concrete, the burlap shall be removed and the surface covered with at least two inch (211) of earth and earth dykes of sufficient height to hold at least two inches (211) of water over said earth covering, and the pavement shall be kept flooded with water for a period of fourteen (14) days and protected from traffic for at least thirty (30) days. No live loads shall be permitted upon any portion of'the bridge for a period of thirty (30) days from the date the concrete is placed. SECTION 22: CONCRETE RAILINGS. At the open tops of forms the edges of the railing shall be rounded by means of an edging tool. Pure hydrated lime shall be added to the concrete in curbs, railing and posts. The amount of lime to be used shall be approximately five per cent (5%%) by weight of the cement used in the concrete. The cement for use in concrete railing and posts shall be preferably a light color, in the finished product. SECTION 23: SIDEWALKS ON BRIDGES. After the concrete has been deposited in place, it shall be thoroughly tamped in such a manner that the coarse aggregate will be forced down and a layer of free mortar about one — quarter inch (1/411) thick covers the surface. The surface shall be struck off by means of a strike —board to a uniformly smooth surface after which it shall be floated with an acceptable wooden or cork float. The surface shall then be marked into uniform rectangles not ldss than two feet six inches (2' -0), nor more than four feet (41) on a side. A marking shall be placed across the walk at the ends of spans where an expansion joint has been installed. When a five foot (51) straightedge is placed on the side- walk, the surface shall not vary more than one — eighth inch (1/8 ") from the edge of the straightedge, except at grade changes, and the finished surface shall be free from blemishes. SECTION 24: SURFACE FINISH- The external surface of all concrete masonry shall be thoroughly worked during the operation of placing by means of a broad —tined fork or a concrete spade of an approved type. The work- ing shall be such as to force all coarse aggregate from the surface and thoroughly work the mortar against the forms to produce a smooth finish free from water and air pockets or honeycomb. Upon removal of forms all depressions resulting from the removal of metal ties and all other holes and rough places shall immediately be pointed with a mortar composed of three parts of sand and one (1) part of cement. The surface film of all such pointed surface shall be carefully removed before setting occurs. Exposed surfaces shall then be finished by the methods specified below. The surface finish shall be obtained by finishing in two (2) operations, namely, "first rub" and "second rub ". The "first rub" is a surface treatment of imperfections that are present upon the removal of forms, such as form marks, bolt holes, protruding tie wires, etc., and shall be done immediate- ly upon the removal of forms, usually within twerty� four (24) to forty —eight (48) hours after concrete is placed on vertical surfaces that are not supporting members. After removing any fins or —19— projections, 'a mortar composed.of.one (1) part cement to three (3) parts of sand (screened through a 14 or 16 mosh scree) shall be applied to the entire surface, while the concrete is green so that it will become an integral part of the surface. Care shall be exercised that the mixture is not too rich so that chocking of the surface will be prevented. The "second rub" shall be done as the last operation when all other work on the structure is completed. Tho.workmen shall start at the top "and work down. The treatment shall ponsist of the application of orator and very thorough rubbing with carborundum stones. Care shall be exorcised to leave the surface without show- ing linos whore work startod and stopped. Mechanical means of surfacing may be employed if the rosul.ts obtained are of the same quality as the foregoing. Whon tongue and groove lumbar is used and a smooth surface free from pockots or honey comb is obtained, rubbing Pf exposed surfaces will bo rogizirod for•tho handrail only. SECTION 25, FORMS. The forms shall be smooth, tight, true to the required lines and grade, and of sufficient strength to resist springing out of shape during the placing of the concrete. All dirt, chips, sawdust, etc., shall be thoroughly removed from forms before apy concrete is deposited therein. All mortar and dirt shall be removod from forms previously used. The forms shall be thoroughly soakod with water inside and outside immediately before corkcroto is placed against them; they shall remain in place until the Engineer authorizod their removal; and they shall be removed in such order as hp may iiroct. Falsework and forms supporting concrete beams ,rod slabs shall not be removed in loss than twenty —oight (28) days after said beams and slabs have been placed. Forms for reinforced concrete piles shall remain in place fourteen (14 ) days. In no case shall any .. forms be removed in.loss than ten 10) days after placing concrete, without permission of the Engineer. The shooting for all outside faces above the surface of the ground shall be surfaced on both edgos and one side to a uniform thickness, with the surfacodd silo against the coneroto. Tongue and groove lumber shall preferably be used. Sharp edges and corners in the concrete shall be avoided by nailing to the forms a triangular fillet of wood made from a 1 —inch by 1 —inch piece sawed diagonally and by bevelling the corners of forms. This is not to be done, however, in the forms for concrete railings. Forms for the railing may be made of metal or of tongue and groove surfaced lumber. They shall be of first ciass workmanship. and shall meet with the approval of the Engineer. A1} corners or sharp olges shall be chamfered. This shall be done in forms con - structo.i.of lumber by nailing in triangular fillets of wool made from a one — quarter inch by one — quarter inch (i" x ',"):piece sawod diagonally. In order to prevent these strips from getting out of line by bulging or otherwise, necessary precautions shall be taken such as using lumber of minimum swell when wot, short lengths of fillets and nailing at intervals of not more than four inches (411). The workmanship shall be equivalent to first class pattern work. Forms shall be given a coat of white shellac or other equally good preparation before being used. Bolts shall be used to hold railing forms together. —20— +4. The thickness of forms for copings and curbs shall not be less than two inches (2 ") ani the width not less than the full depth of coping or curb. The forms shall be so constructed that portions, where finishing is required", may be removed without disturbing portions of forms to remain. `Forms shall be of sufficient strength to carry the dead weight of the concrete as a liquid without deflection, and if any such deflection occurs it shall be sufficient cause for the re- jection of the work. Forms for girders and slabs shall be cambered such amount as may be required by the Engineer. Forms :shall as far as practicable be so constructed that the form.marks will conform to the general lines of the structure as directed by the Engineer. Bolts shall be used to hold together forms for all sections two feet (21) or more in thickness. SECTION 26: FALSEWORK. The Contractor shall set all footings and posts deep enough. in the ground to prevent undermining by flood waters during con- struction and he shall take all risks as to the safety, stiffness and adequacy of falsework, trusses, supports, footings, posts, etc., used on the work. Falsework and footings shall be of adequate size and strength to support safoly the loads imposed upon them without injurious de- formation or settlement. Wedges shall be used to bring forms for beams and girders to exact elevation, required camber and uniform bearing before pouring concrotc. In all cases the Contractor shall be responsible for and must make good any injury arising from inadequate forms or falsework or from the promaturo removal thereof. SECTION 27:' REINFORCEMENT CLEANING: Reinforcing steel before being positioned, shall be thor- oughly cleaned of mill and rust scale, mortar, oil, dirt and of coatings of any character that will destroy or reduce the bond. BENDING: Reinforcing steel shall accurately conform to the dimensions shown on the plans. The radius of bends shall be four (4) or more times the least diameter of the bar. STRAIGHTENING: Bars shall not be bent or straightened in a manner that will injure tho material. Bars with kinks or bends shall not be used. —21— _• PLACING, Reinforcing bars shall be accurately placed as shown on the plans and shall be firmly and securely held in position by wiring atintersections with No. 14 wire and by using concrete or metal chairs, spacers, metal hangers, supporting wires and other approved devices, furnished by and at the expense of the Contractor. Metal supports which extend to the surface of the concrete and wooden supports shall not be used. Placing bars on layers of fresh concrete as the work progresses and adjusting bars during the placing of concrete will not be permitted. Bars shall be accurately spaced as shown on the plans. In no case shall the clear distance between parallel bars be less than one and one —half (1� ") inches and in no case shall the embed- ment in concrete be less than twice the diameter of the bar. SPLICING. Splices of tensile reinforcement at points of maximum stress shall be avoided. Where bars are spliced they shall have a lap of at least forty (40) diameters. INSPECTION. No concrete shall be deposited until the Engineer has inspected the placing of the reinforcing steel and given per- mission to place concrete. All concrete placed in violation of this provision will be rejected= SECTION 28, EXPANSION JOINTS. Expansion joints shall be place9. where indicated on the plans, and shall be provided by placing in position for the full width and depth, a previously prepared strip in the form of a built —up board, composed of a body of compressible asphalt compound supported by layers of asphalt saturated high grade woolfelt along the exterior vertical faces for the full depth of the joint. The expansion joints shall be of such character as not to become soft and run out in hot weather, nor hard or brittle and chip out in cold weather. SECTION 29. CONCRETE PILES. Concrete piles shall be properly reinforced as shown on the plans, care being taken to insure that the reinforcing steel is placed and held firmly in correct position. They shall be kept wet for at least fourteen (14) days after pouring and shallbe allowed to harden for at least thirty (30) days before being lifted or driven. When removed from the forms, they shall present true, smooth, even surfaces, free from honeycomb and voids and shall be so straight that a line stretched from butt to tip on any face will not be more than one inch (11') from the face of the pile at any point. Concrete piles must at all times be so handled as to avoid breaking or chipping the edges. The Contractor shall provide slings at or near the quarter points for raising or transporting long piles. — @2_ • DRIVING• The piles shall be accurately spaco3 and driven or jetted vertically or on a batter as shown on the plans and according to the stakes sot by the Engineer. Piles that are injured in driving and piles that are driven out of place shell be withdrawn or cut off as directed by the Engineer, A satisfactory steam hammer of ample weight shall be used for driving piles. The heads of the .concrete piles shall be protected from the direct impact of the hammer by a cushion head and this cushion head shall be so arranged that the reinforcing rods projecting above the piles will not be displaced or injured in driving.* Piles may be cast full length of rods, if desired, provided tops of piles are cut off to expose steel as shown on the plans, after riles have been driven. A water jet shall be used if necessary in driving the piles. Jetting aparatus of sufficient capacity must be furnished by the Contractor. A gauge shall be provided in the jet line so that the pressure may be determined at all times. After jetting piles to such a depth as the Engineer may prescribe, the use of the jet shall be discontinued and the piles driven to firm bearing with the hammer alone. Piles must be jetted and driven to the depth below point of cut off shown on the plans and they shall be furnished of suf- ficient length thereof. When no length is shown, they shall be driven to a penetration of not more than one (1) inch at the last blow with a three thousand (3000) pound hammer falling twenty (20) feet on to a sound head or an equivalent penetration. SECTION 30: SCHLUETER INTERLOCKING CONCRETE SHEET PI E• Schlueter Interlocking Concrete Shoot Piles shall be . constructed along such portions of the work and of the size and shape as shown upon the plans. The concrete materials used in the uonstruction thereof as well•as measuring materials, mixing of concrete, placing, pro- tection, etc., shall conform to the requirements hereinbefore specified for concrete piles. SECTION 31: CONCRETE STEPS AND LANDINGS. Concrete steps and landings shall be constructed along such portions of the work and of the size and shape as shown upon the plans. The concrete and cement mortar finish and all concrete materials used in the construction thereof, as well as measuring materials, mixing of concrete, placing, protection, Otc., shall conform to the requirements for the construction of cement concrete sidewalk as provided for in Specifications No. 39, for the con- struction of cement concrete pavements, cement concrete curbs and cement concrete sidewalks, adopted by Resolution No-'346 of the Board of Trustees of the City of Newport Beach. SECTION 32: CONCRETE PIPE DRAINS• Concrete pipe drains shall be constructed along such portions of the work and of the size and shape as shown upon the plans. All concrete materials used in the'constructi.on of the pipe shall conform to requirements hereinbefore specified. The aggregate shall be composed of sand or of sand and rock provided that the size of the rock when used in its greatest dimensions must not be greater than one —half (1 /2) the thickness of the shell of the pipo• —23— W1 1. Tho pipe shall be made of a mixture which shall be by measure not less than one (1) part of cement to throe ;(3) parts aggregate. The material shall be thoroughly mixed in a batch machine mixer and shall be machine molded and machine compacted. Cement mortar for joints shall be composed of one (1) part of cement to two (2) parts sand. Care should betaken to in- sure a water tight joint. SECTION 33'. DESCRIPTION. PIPE YNDRAIL. Pipe handrail shall consist of two inch (2 ") posts and rails. Pipe shall be standard galvanized iron or stogl. The hand- rail shall bo'fastonod together with fittings or by welding. If pipe is welded, all burrs and lumps of metal shall bo :removod and the rail shall present a neat and workmanlike appearance. Fittings, if used, shall be ball pattern galvanized malleable iron free from flaws. CONSTRUCTION: Pipe rails shall be cut to multiples of even panel lengths so that there will be no joints in the rails between the posts. Fittings shall screw onto all posts and both ends of each length of rail. The rails shall slido through th3 intormodiato fittings. Throaloi joints shall be coated with white leas before assembly and turnod up so that no threats will be exposoi after erection. All connections must be tight. The posts may be set at the time the concrete is poured, or holes may be left ani the posts afterwaris groutoi in lace with a grout composed of one (1) part Portland cement and two 2) parts of clean sans. The completed railing shall be true to line and grado. SECTION 34: M2ANSION DETAILS Expansion details shall conform to the plans. The Con- tractor shall oxerciso the utmost care to sot top ani bottom plates of rocker bearings and expansion plc.tes in correct position and truly level in all directions: so that all rockers ani expansion plates will take uniform bearing. Expansion angles at joints on floor slab shall be care- fully bent to the crown of the roar ani accurately placed true to grade, one - eighth inch (1/8 ") below the roadway surface. 'Phosphor bronze expansion platce shall be cast in the form anal dimensions shovm on the plans and contact surfaces shall be milled, polished ani covered with flake graphite when placed. SECTION 35: Cement concrete pavement, cement concrete sidewalk and cement concrete curbs shall be constructed along such portions of the work and of the size end shape as shown upon the plans and in accordance with City of Newport Beach Standard Specifications No. 39 adopted by Resolution No. 346 of the Board of Trustees of the City of Newport Beach. -24- SECTION 36: ORN.4kENTAL LIGHTING. work 'o be done.. 1. Remove the existing concrete lighting posts.and all ac- cessories and install them at the locations as shown on the plans. 2. To furnish all material, including posts, conduit, cable, lamps, globes and all other necessary appliances for the installa- tion of bridge lighting posts. 3. To furnish all labor necessary, lay conduits, install cable, erect and equip the posts. ORNAMENTAL LIGHTING POSTS: The posts shall be of the type and kind manufactured by the Lalux Manufacturing Company and designated by them as Lalux Bridge Lighting Posts No. 28, complete, as shown on the plans. These Posts shall be made of crushed granite and cement and have etched granite finish, and shall be of the design and construction as shown on plans. The GLOBE HOLDERS shall be cast bronze of the type shown on the plans and shall have ample provision for drainage to the outside. The Posts shall be composed of materials in the following proportions:- One (1) cubic foot of Portland Cement, Three and one -half (3z) cubic feet of crushed granite, miled thoroughly with two and one -half (22) gallons of water added to form a saturated mass, which is then fed into the special molds. The reinforcing shall consist of four 3/8" square deformed steel rods extending vertically from top to bottom of posts and to be equally spaced around shaft, and to be at least 1" from outside surface. Reinforcing rods shall be held and supported in position by means of spacer rings fitted around the core tube and shall be spaced not more than two feet apart. Each spacer ring to have four lug rings to support the reinforcing bars in such a manner that these bars cannot drift or be forced out of position during the process of manufacture. The reinforcing above described shall be securely fastened into the special metal molls in such a manner that no tension is applied to the reinforcing. The molds to be closed and securely bolted up and placed .in a machine that so operates luring the process of filling the moll that all voids and spaces will be thoroughly filled with a dense concretemixture. The forms or molds can be then fastened into a machine that rotates with a sufficient speed to compact the mass of concrete so that a cross - section taken from one of the posts after it is cured and finished will closely resemble granite in its original state. -26- I% i J r • The Granite Concrete Mixture after going through the above process shall be allowed to set in the mold until it gains sufficient strength to be stripped out and handled safely. It shall then be put in a tank of water and allowed to cure under water at least three days before removing and shall then be taken out of the water and permitted to air cure at least ten days. It shall then be dipped in acid to etch the exterior surface to the granite texture above mentioned, all acid to be thoroughly washed off with clean water after the acid etching process. The bridge lighting posts shall be anchored to the bridge posts as shown on the plans. Aluminum cover plates eight and one -half inches by nine and one -half inches (8i" x 9jn) shall be installed at the hand - holes on the bridge posts, as shown on plans. Lalux Lighting Units No. 1002 manufactured by the Lalux Manufacturing Company shall be installs on the bridge lighting posts as shown upon the plans. All lighting units must be assembled absolutely water- tight. All conduit, cable, post wiring, sockets and lamps shall be installed along such portions of the work, as shown upon the plans. The materials used in the installation thereof, as well as the installation of the cable, conduit, post wiring, etc., shall conform to the requirements as specified in the City of Newport Beach Standard Specifications No. 38, adopted by Resolution No. 321 of the Board of Trustees of the City of Newport Beach. SECTION 37: Existing water pipe lines shall be moved to the new locations as shown upon the plans. where necessary to disconnect the pipe line, the Contractor shall join the pipe in it's new location, the joint to conform to the original joint. where ad- ditional pipe and pipe fittings are required, they will be supplied to the Contractor by the City water Department of the City of New- port Beach. The Contractor shall furnish all labor necessary to dis- connect the pipe and the moving of the pipe and the re- connection of same. The Contractor shall supply and install all pipe hangers as shown upon the plans. The Contractor shall take proper steps necessary to prevent the interruption of water service. SECTION 38: REMOVAL OF EXISTING w00DEN BRIDGES. !, The Contractor shall remove the salvaged material not required in bridges shall be delivered to the City in the City, as directed by the Street .126= the existing bridges. All the construction of new yard or any other location Superintendent. � �, Passed and approved this 6-d clay of 192 �n VI STATE OF CALIFORNIA y ATTEST: City Clerk. COUNTY OF ORANGE l ss. CITY OF NEWPORT BEACH ) I,. City Clerk of the City of Newport Zeach, do hereby certify that the foregoing Resol- ution, being Resolution No./-/7y, was adopted by the City Council of the City of Newport Beach, signed by the Mayor of said City, and attested by the Aity Clerk, all at a regular meeting thereof held on the b- day of 790 192 and that the same was adopted by the following vote, to wit: AYES: Councilmen, �G��`�°� "" G�.�,.vrr'�, /✓- IV (itc�a..- ...a.,v, 777ws c.�w �.�+� "�^.•d1"' NOES: Councilmen, ABSENT: Councilmen, �J'Lynz. City Clerk of the City of Newport Beach W_