HomeMy WebLinkAbout448 - Specifications 43 - Reinforced Concrete Bridges0•
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RESOLUTION NO. Z=
A RESOLUTION OF THE CITY COUNCIL OF THE CITY
OF NEWPORT BEACH ADOPTING SPECIFICATIONS NO.
43 FOR THE CONSTRUCTION OF REINFORCED CONCRETE
BRIDGES 'WITHIN SAID CITY.
BE IT RESOLVED by the City Council of the City of
Newport Beach thet the following specifications, to be known as
Specifications No. 43, for the construction of reinforced concrete
bridges in the City of Newport Beach, be and the same are hereby
adopted.
!CORK TO BE DONE
Under these Specifications the Contractor will be
rec,-.ired:
s
1. To excavate or fill in to such an extent and in such a
manner as may be required by the plans, profiles and cross - sections
and these specifications.
2. To furnish all materials as hereinafter provided and
required in the construction and completion of the work or im-
provement, as specified herein, and all labor, tools, machinery
and equipment necessary and required for the performance of said
work or improvement.
3. To construct the bridge and appurtenances thereto com-
plete as hereinafter specified.
GRADING.
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Grading shall include all filling, the removal of all
earth, sand, stone or other material of Thatever nature it may be
that may be encountered in preparing the foundations for pile
bents, abutments, wails, etc., and shall also include all trimming
and shaping required to bring the fill or excavation, as the case
may be,.to grade and cross - section. Then mud or other soft ma-
terial ie encountered it shall be taken out and the space filled
with good earth, sand or gravel, which, if it is earth or gravel
shall be either rolled or ta::ped 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
material to a depth greater than five (5) feet below the subgrade
of the foundation for walls, abutments, pile bents. etc.
All filling shall be done with good sound earth, gravel
or sand. whenever a fill is to be made of earth or gravel the
embankment 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. Then 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 a:': r .; ?i, timber, trash or
other debris unfit for foundnticn.
The .Contractor shall noti."y &Ya DaDineer when any portion
of the work has -,been brought to subgrede when the latter will
check the elevations of the same, and if the mork is found to be in
accordance with the specifications and grades given, the Contractor
shall proceed as hereinafter mentioned.
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MATERIALS FOR REINFORCED CONCRETE.
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All materials includinb cement, sand, pea gravel, travel,
broken stone, reinforcin6 steel, water, etc. shall conform to the
followinb specifications:
CEMENT.
All cement shall be Portland Cement, and must conform
to the following requirements and be subject to the following
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.
W CONSISTENCY. All cement for act tests, test pats, and
neat briquettes will be mixed with sufficient water to reduce the
cement to normal consistency, as prescribed by the Specifications
of the American Society for Testing materials, hereinbefore re-
ferred to. Neat briquettes will be compacted by light tamping.
vortar briquettes shall be mixed to a state of plasticity corre-
sponding as nearly as possible to normal consistency in neat
briquettes.
(b) FINENESS. The cement must be evenly ground, and when
tested mite ollowing standard sieves, must pass at least
the following percentages by weight:
No. 100 Sieve, havin6 100 meshes per lineal inch -
92 per cent.
No. 20r) Sieve, having 200 meshes per lineal inch -
75 per cent.
(c) TIDE OF SETTING. It shall develop initial set in not
less than one hour, nor more than ten hours.
(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 and six in water) - 500
pounds.
At 28 days (1 day in moist air and 27 days in -ater)
600 pounds.
Briquettes one inch square in section, made of one part
of cement, three parts of standard testin6 sand, shall attain a
minimum strength as follows:
At 7 days (1 day in moist air and 6 days in water)
200 pounds.
At 28 days (1 day in moist air and 27 days in • ^star)
275 pounds.
The sand test must in all cases show an increase in
strength at 26 days over the 7 -day tests.
M (e) SOUNDNESS. Pats of n -at ::.o�ut three inches in
diameter, one -half inch thick Lit. t _ ._a :c. .end tapering to a
thin edge, will be kept in moist arcs :: r�riod of 24 hours.
A!Pat will then be kept in air at normal temperature and
observed at intervals for at least 28 days.
Another pat will, after having been kept 24 hours in
moist air, be placed in water at normal temperature and maintained
for three hours.
These pats, to satisfactorily pass the requirements, must
remain firm and hard, and must not show any sibne of distortion,
checking, crecking,.blotchint or disintegrating:
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(f) PROTECTION. All cement stored must be protected from
the weather and be delivered to the work in the original package
of the manufacturer. No cement shall be used which has been mixed
in any way with another brand or quality of cement or which has
been.tampered with in any way after being, placed in the original
package of the manufacturer, nor shall any cement be used from
packages containing lumpy cement or which has been reground.
SAND
DEFINITION OF SAND.
The fine, granular material naturally or artificially
produced by the disintegration or erosion of rock.
SPECIFICATIONS AND TESTS FOR SAND TO BE USED IN CONCRETE.
1. OIL. Send shall be free from oil.
2. ORGANIC MATTER. Sand, when tested in accordance with
Method of Test_fereinafter described, shall not show a solution
color darker then the standard color solution.
3. STRENGTH. Sand, when tested in accordance with method
of Test Mere na ter described, shall not show compressive strength
at the age of seven (7) days, less than that of Ottawa Standard
Sand, similarly tested.
4. TASTING. Sand shall be thoroughly ^nd 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
*flethod of Test hereinafter described, shall conform to the follow-
ing sieve analysis, by weight:
(a) Not more than five (5) per cent minus the per cent of
silt, loam, clay, etc., determined above (Paragraph 4, ffTashingf +)
shall pass a tTo. 100 sieve.
(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.
SAND.
TAR F
1. OIL. Sand shall be free from oil.
2. ORGANIC MATTEP.. Sand, when tested in accordance with
V ethod of Test hereinafter described, shall not shorn a solution
color darker than the Standard color solution.
3. STRENGTH. Sand, when tested in accordance with 'method
of Test hereinafter described, shall not show compressive strength
at the age of seven (7) days less than th,.i.t of Otta.ws Standard Sand,
similarly tested.
4. WASHING. Sand shF .' I)e >•Y..�r. , .E,:'..,; ;:,Ild uniformly washed.
After washing, sand, when ce.ste a.0 rd ±ir:� nth ±Fethod'of
Teat, hereinafter described; shall not contain more than three (3)
per cent by weidht of silt, loam, clay, etc.
5. SIEVE ANALYSIS. Sand when tested in accordance ^ith
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, ffTashin6(f)
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shall pass a No. 100 Sieve.
B. Not less thv.n seventeen (17) per cent and not more
than forty -two (42) per cent shall pass a No. 30 sieve.
•• C. All shF +11 pass a %o. 4 sieve.
METHODS OF TEST.
A. Method of Test for Or anic Ire uritiea,
1. a represen a iv ea sa:rp a 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.
(c) A 3 per cent solution of sodium hydroxide (DTaOH) in
water shall be added until the volume of sand and liquid, after
shaking, gives a total value of 7 liquid ounces.
(d) The bottle shall be stoppered end shaken thoroughly
and then allowed to stand for 24 hours.
(e) A standard color solution shall be prepared by
adding 2.5 cc. of a 2 per cent solution of tannic accid in 10 per
cent alcohol to 22.5 cc. of a 3 per cent sodium hydroxide solution.
This shell 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 (e) or with a glass of color similar to the Standard
Solution.
2. Solutions darker than the standard color have a n olor
Valuett hither than 250 parts per million in terms of tannic acid.
B. Method of Test for strength.
Bo�ti concrete sank TA-H -Ottawa Standard Sand (the latter
as hereinbelow described and defined) shall be made into mortar
composed of one (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 hereinbelow described.
MIXING CEMPIT MORTAR.
1. The quantity of dry material to be mixed at one
time shall not exceed 1000 g. nor be leas than 500 g. The pro-
portions of cement, or oemr:ent and sand, shall be stated by weight
in grass of the dry materials; the quantity of water shall be
expressed in cubic centimeters (1 cc. of water - one g.). The
dry materials shall be weighed, placed upon a non - absorbent sur-
face, thoroughly mixed dry if sand is used, and a crater formed
in the center, into which the proper percentage of clean water
shall be poured; the material on the outer edge shall be turned
into the crater by the aid of a trowel. After an interval of 1/2
minute for the absorption of the water, the operation shall be
completed by continuous, vigorous mixing, squeezing, and kneading
with the hands for at least one :minute u_ar_g the operation of
mixing, the hands should ba pro,nctea 1.,y rna^er gloves.
In order the secure uniformi'.'y i-: the results of tests
for compression strength, the manner of mixing above described
should be carefully f- ollowed. At least one minute is nege�a',
to obtain the desired plasticity which is not aopre4.�¢yt Y ffeoted
by continuing the mixing for several minutes, the oxxo't` time
necessary is dependent upon the personal equaiion of ;th.e''operator.
The error in mixinL- should be on the aid'el off' over - mixing.
2. The temperature of t`h'e; room and the mixing water
shall be maintained, as, nearly- a's`ps'aetf,caoldf at 210 c. (76oF).
4. -
Consistency of TFortar.
Fourteen per cent (144) of water shall be used with
Ottawa Standard Sand.
To obtain the same consistency with the concrete sand,
a metal truncated cone four inches (411) in greatest diameter, two
• inches (211) in smallest diameter, and six inches (61t) high, shall
be used.
The consistency of the concrete sand mortar and that of
the Ottawa Standard Sand mortar shall be considered the same when
their respective slumps, made as above, are equal.
Compression Tests.
T. A cylindrical test piece 2 in. in diameter and 4 in.
in length is recommended for use in making compression tests of
at .idard mortars. The molds shall be made of non - corroding metal.
A satisfactory form of mold is shown.in Fi.. 1, pate 134, of
A.S.T.M. 1924 book of Tentative Standards. The ends of the mold
shall be parallel. The tubin6 used in the molds shall be of
sufficient thickness to prevent appreciable distortion. The molds
shall be oiled before using. During t:e..moldin6 of the piece, the
mold shall rest on a clean, plane surface (preferably a piece of
plate glass which is allowed to remain in place until the mold is
removed).
2. The sand to be used shall be natural sand from Ottawa,
Ill., screened to pass a No. 20 sieve and retained on a No. 30
sieve. This sand may be obtained from the Ottawa Silicia Co.,
at a cost of three cents per pound, f.o.b. cars, Ottawa, Tll.
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 -g. sample.
4. The sieves shall conform to the following specifica-
tions:
The No. 20 sieve shall have between 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 mires. The diameter of the wire should be
0,0165 in. and the average diameter shall not be outside the
limits of 0.0160 and 0.0170 in.
The No. 30 sieve shall hive between 29.5 and 30.5 wires
per whole inch of the warp mires and between 28.5 and 31.5 wires
per whole inch of the shoot wires. The diameter of the wire
should be 0.011 in. end 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.M. 1924 Book of
Tentative 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 with a trowel. As soon as the
test pieces from one sample are molded, the top of each test piece
shall be covered with a piece of glass which is brou6ht to a firm
bearing on the fresh mortar. The cover glasses shall remain in
place until molds are removed.
6. Tests of standard mortar cylinders shall be made in
any testing machine which is adapted to meet the specified require-
ments. The test pieces shall be tested as soon as removed from
the water. The ends of the test cylinders shall. be smooth plane
surfaced. The metal bearing niates of . :,. c:,;zin machine shall
be placed in direct contact t.r.e enls „f the test piece.
During the test a spherical bearing; block shall be used on top
of the cylinder. In order to secure a uniform distribution of
the load over the test cylinder the spherical bearing block must
be accurately centered. The diameter of the spherical bearing
block should be only a little greater than that of the test piece.
The test piece shall be loaded continuously to failure. The moving
head of the testin6 machine shall travel at the rate of not less
than 0.05 or more th n 0.10'in. per minute.
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7. Testing machines should be frequently calibrated
in order to determine their accuracy.
8. Cylinders that are manifestly faulty, or which give
strengths differing more than 15 per cent from the average value
of all test pieces tested at the same period and made from the same
sample, shall not be considered in determining the compressive
strength.
Storage of Test Pieces.
1. The moist closet may gonsist of a soapstone, slate
or concrete box, or a wooden box lifted with metal. If a wooden
box is used, the interior a,ould be covered ^pith felt or broad
wickering kept wet. Via 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 beinb so arranted 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 210C. (70 0F.).
C. Method of Test 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 vessel to be used in the determination
shall be approximately 9 in. (23C mm.) in diameter and not less
than 4 in. (102 mm.) in depth.
3. The sample must contain sufficient moisture to pre-
vent sebregation and shall be thoroughly mixed. A representative
portion of the sample sufficient to yield approximately 500 E.
of dried material shall then be dried to a constant weight at a
temperature not exceeding 100 0.0 (2300F).
4. The dried material shall be placed in the pan and
sufficient -rater added to cover the sample (about 225 cc.). The
contents of the pan shell be agitated vigorously for 15 seconds,
and then be allowed to settle for 15 seconds, after which the
water shall be poured off, care beinb taken not to pour off any
sand. This operation shall be repeated until the wash water is
clear. As a precaution, the mash water shall be poured through
a 200 -mesh sieve and any material retained thereon returned to the
mashed sample. The washed sE =nd shall be dried to a constant weight
at a ter::perature not exceeding 1000C• (2300F.) and weighed.
5. The results shall be calculated from the formula:
Percentage of silt, clay, loam, etc.,
Ori-inal dry weight after washing X 100
OrigInal dry Teig. .
6. "Inen check determinations are desired, the wash
water shall be evaporated to dryness, the residue weighed, and the
percentage calculated fro':~ the formula- _
ut .residue x 100
Percentage of silt, loaf: n1d.y, etc. weight.
D. Method of Test for Sieve
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 ab.regste, SOO j�.
b Coarse ao,,re„ ate or r. mixture of fine and coarse
aggregates, weight in grams, 3000 'times size of largest sieve
required, measured in inches.
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TABLE 2.
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Sieve Opening wire Diam. Tolerance per cent
51eve Wire Yax-
No. or Avg. Diam. imum
Size in opng. Und. Over Open -
Inches. mm. mrr. mm. in. in
No. 110 U.141d 0.0059 0.102 0.0040 9 15 35 4S.
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
0
2. The sample shall be dried at not over 1100 F (2308)
to constant weight.
3. (a) The sieves shall be of square —mesh mire —cloth
ana shall be r.ounted 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 iitto a series of
sizes by ,'leans of the sieves specified in paragreoh 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
scale which is sensitive to 1 /1000 of the reight of the test sample.
(c) The percentage by ^eight of the total sample
-hich is finer than each of the sieves shall be computed.
5. (a) The percentages in sieve analysis shall be
reported to the nearest -hole number.
GRAVEL OR BROKEN STONE FOR CONCRETE.
Coarse aggregate shall be sound crushed rock, broken
stone or -gashed 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 graded
from the largest to the smallest screen sizes given belom, and in
addition shall conform to the follo�ing tests:
GRADING.
Then 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 havint, two (2) inch square
openings.
(b) Not less than ninety —five (95) per cent, by -eight, shall
pass a screen having 1 1/2+r square openings.
(c) Not less than thirty —fi•re (35) per cent and not more than
M sixty (60) per cent, by weight, shall retained on a screen
having 3/41, square openings.
(d) Not more than five (5) per -art, b� — aight, shall pass
a screen having 3/811 square openings.
(e) All shall. be retsired on a 4—mesh sieve.
Gravel shall r.ot s..c- a loss of mure then thirty —two
(32) per cent and broken scnne s:za1Z not shop^ a loss of more than
twenty —two (22) per cent 1-hen subiectea to the rattler test
hereinafter specified.
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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 travel 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.
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Then analyzed by laboratory screens and sieves pea
gravel for use in cement concrete work shall conform to grading
re— iirements, as follows:
(a) All shall pass a screen having 1/2 inch square openings.
(b) Not less than 55 per cent, by weight, shall pass a screen
havint 3/8 inch square openints.
(c) Not less than 40 per cent and not more than 60 per cent,
by weight, shall be retainel on a 4 -mesh sieve having square
openings.
(d) Not more than 10 per cent, by weight, shall pass a
14 -mesh sieve with square openings.
Pea travel shall not show a lose of more then 32 per
cent when subjected to the rattler test hereinafter specified.
RATTLER TEST..
At least thirty (30) pounds of the material to be tested
shall be available for the test. .Each sample when ready for the
rattler shall consist of five (5) kilograms (eleven pounds) of said
material, and shall pass a two and one -half inch screen, sixty
per cent, by weight, shall be retained on a three - quarter inch
screen, end all shall be retained on a one -half inch screen. The
said sample shall be tested in a rattler consisting of a metal
cylinder 28 inches in diameter and twenty inches in length,
longitudinally mo untdd on a horizontal shaft and having a shelf
four inches wide extending from end to end.
During the test the rattler shall be revokved at a rate
of between 28 and 30 revolutions per n;inute. A charge for.the
rattler shall consist of the said five kilogram?rsample and four-
teen cubical blocks of oast iron with rounded corners and edges,
said blocks measuring about one and one-half inches in each
dimension and havint a weight of five kilograms. After receiving
the charge, the rattler shall be given five hundred revolutions.
The sample shall then be screened and the portion, by weight,
which will pass a 10 -mesh screen, which shall be considered and
designated as the lose.
REINFORCING SV.ifL
Steel shall be made by 'hc, op-ii :5azxth grccess and ahall
be of uniform quality. It shall contain r.ot mere than five -
hundredths (.05) per cent sulphur; if made by the acid process it
shall contain not more then six hundredths (.06) per cent phos-.
phorus, and if made by the basic process not more than four -
hundredths (.04) per cent phosphorus. I7aien 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,OOC) pounds per square inch; an elastic
limit of not less than one -h31f (1/2) the ultimate strength, and
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a minimum percentage of elongation in eight (8) inches of one
million two hundred and fifty thousand (1,250,000) divided by the
,' -, timate strength. Test speci -,ens shall bend cold through one
hundred and ei,hty (180) degrees around a pin without cracking on
the outside of the bent portion, tae dirnmoter of the pin being
equal to the thickness of the speci:roen if less than three- quarter
(3/4) inch, and being twice the thickness of the snecimen if three -
quarter (3/4) inch or larger.
Reinforcin6 bars shall be free from flaws, cracks, mill
scale, oil or paint. All reinforcing, bars shall be square deformed
bars unless otherwise specified.
?IATER .
'dater shall be clean, free from oil, acid, alkali or
vegetable matter.
PROPORTIONING CONCRETE MATERIALS.
All cement concrete shall be composed of the following
materials and in the following proportions:
One (1) sack of cement weibhing ninety -four (94) pounds,
net, to five hundred thirty -five (':a35) pounds of mixed aggregate,
by wei ht, except as herein otherwise provided, and not less than
six 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 two hundred forty (240)
pounds of gravel or broken stone and 295 pounds of sand and pea
gravel, except as herein otherwise provided. The percentage by
weight of sand and pea gravel shnil be determined by the following
formulas;
0 100 A -3.90
A -B
D = 100 - 0
'shore A is the fineness modulus of the pea gravel
B is the fineness modulus of the sand
0 is the percentage of sand, by weight
D is the percentaga of pea gravel, by weight.
The fineness modulus of the sand and the pea gravel
shall be determined by a sieve analysis usin6 the following sizes
of Standard Sieves with bquare openings;
100 -mesh, 50 -mesh, 30- mesh, 14 -mesh, 8 -mesh, 4 -mesh,
3/811 -mesh, 3/411 -mesh and 1 /2i' -mesh:
The sum of the percer.,tapes of materiP_l, by weight, of the
sample coarser than ea.--h cf the :ri' Iao -'"[: si. ;,e :n of the Standard
Sieves hereinbefore mentioned c +.i.wi?cr) :.)-,T '0 , the fineness_ modulus
of the material.
The weights herein sped dr; :,and, pea ;ravel
and gravel or broken stone. Provided :i.rr mol is contained in
said materials, tae weight thereof must ';e deducted fn order to
obtain the weights above specified for dry materials.
The weights above specified for ssnd, pea gravel and
gravel or broken stone are based upon a minimum specific gravity of
2.67 and a maximum of 2.69. To de'cerc;ine the unights of ai,�6regate
for the concrete mix when the specific Gravity of the aggregate
is different than the values mentioned, mulitply the weights of
aggregate above specified by the value i!F" 6iven in the
Table opposite the specific gravity of the aggregate:
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Specific 'Gravity...
of Aggregate
2.59 to 2.61
2.61 to 2.63
2.63 to 2.85
2.65 to 2.67
2.67 to 2.69
.:.2.69 to 2.71
2.71 to 2.73
2.73 to 2.75
6
L r Cn �P
Value of
F
0.970
0.976
0.985
0.992
1.00
1.008
1.015
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.
TMUHING MATEF IALS .
i d
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 specified
by Means of multiple beam or dial scales. The scales shall be set
so that the gradings as aotually-obtained shall not be below the
minimum nor above the maximum percentages herein specified.
Cer,ent in sacks as above specified shall be dumped
directly in the mixer. The water necessary for every 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.
MIXING CONCRETE.
All :nixing of concrete for the pavement shall be done
in a batch :mixer, equipped with a batch meter.
The mixer shall be charged with.oecaent 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 separa-
tion of the coarse aggregate from the mortar. The mixer drum shall
have a speed of not less than 13 revolutions per minute, and every
batch of concrete shall be mixed in the drum of the mixer not less
than sixty (60) seconds before any portion of the batch is dis-
charged from the said drug. At least seventy -five (75) seconds
must elapse between the placin6 of successive batches in the mixer.
CONSISTENCY OF CONCRETE.
The concrete, after being -:axed as hereinbefore specified,
shall, when subjected to the following test, have a elunp of not
less than eight (8) per cent, nor ^core than twenty (20) per cent.
The slump test shall be made in the following manner; The test
tube to be used in making the slump teat shall have an inside
diameter of ei�,ht (6) inches at the base End. an inside diameter of
four (4) inches at the top, and a. perpendicular- height of t+melvp
(12� inches. Ir.mediately after the concrete ans been mixed and
deposited on the sub - grade, a sufficient quantity thereof shall*
be placed in four layers in the tapered test tube until the eon -
crate is flush with the top of the tube, each layer shall.bg
thoroughly settled by working with a pointed iron TOM . Then 'she
test tube shall be lifted, allowing the coneret td settle or
slump. After the pile of concrete has set o'ho 71) minute, its
height shall be measured and subtracted ftdm the original height
of twelve (12) inches, which differeiicd in height is the amount bf
the slump in inches from. which -the percentage of slump shall be
determined.
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TESTS OF CONCRETE.
The concrete composed of the materials, proportions,
consistency, mixing, etc., provided for in these 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 ultimate modulus of rupture of not
Less than 600 pounds per square inch.
The test specimen for determinint; 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 mo#uIL',a 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 (36) inches in length.
Samples of the concrete to be tested shall be taken
immediately after the concrete has left the mixer and deposited
on the subgrade and molded into the test specimens above mentioned.
The concrete shall be thoroughly rodded and care taken to remove
air pockets. The freshly made test specimen shall be struck off
and troweled level with the.top of the sold. The test specimen,
after molding, shall be covered to protect same from injury, and
buried in damp sand, and at the end of forty -eight (48) hours the
mold shall be removed and the test specimen covered with sand or
earth and maintained in a continuous damp condition for a period.
of ten (10) days. At the end of twelve (12) days from the day of
molding the specimen, it shall be uncovered and air - cured for six-
teen (16) days, arld tested at the end of twenty- eig:at (28) days.
PLACING CONCRETE
The concrete shall be placed in a manner to insure a
smooth igurface next to the fora.s and shall be thoroughly spaded
and worked around the metal reinforce -rent and into the recesses
of the forms.
Thenever possible an entire section of the bridge floor
between expansion joints shall be placed in one day. Concrete
6hall be deposited in its final position as soon as possible after
silxing. There the work is interrruoted so that the last layer of
` oomrate shall have hardened before the next layer can be applied,
th6 sipper surface shall be left level, roughened and clean, and
shall then be covered until the work is resumed, at which time the
surface must be cleaned of all foreign material and laitarce,
then drenched and alushed with a. mortar consisting of one sack of
Portland Cement and two cubic feet of concrete sand. The concrete
should be placed 'in continuous horizontal layers, and vertical
joints avoided whenever possible. Torkmen are not permitted to
walk on freshly laid concrete.
RE- MIXING OF CONCRETE.
No concrete shall be used that shows evidence of having
set, or that has become unfit for good wo7-k from standing too long
or from any other cause, and no re- mixint, of ,onc_cete_ will be
permitted.
M SURFACE FINISF OF BRIDGE FLOOR, GIRDYRS, CAPS, PILED,
'BALLS, ABUTMENTS, ETC.
The exposed surfaces of all floors, girders, caps, piles,
beams, slabs, 'calls, abutments, handrails, posts, copings, etc.
shall be carefully and thoroughly ta:r:ped and im+.r,ediately after the
forma have been removed all projections and irregularities on the
exposed surface shall 'be renoved and all cavities neatly fillea
with cement mortar. Sufficient cement mortar composed of one (1)
part of Portland Cement and two (2) parts of cement mortar finish
sand shall be used to fill the cavities, but no plastering ^wi11 be
permitted. All exposed surfaces shall be finished to Five a smooth
and neat appearance in every respect.
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PROTECTION AND CURING.
Surfaces of concrete where possible shall be protected
from sun and wind and the concrete kept moist for a period of at
least ten (10) days. The floor slabs shall be covered with damp
earth which shall be kept met continuously by sprinkling for a
• period of not less than ten (10) days. No live loads shall be
oerltitted upon any portion of the bridge for a period of thirty
(30) days from the date the concrete is placed. Reinforced concrete
piles shall not be placed in the work until they are thirty (30)
days old, nor shall they be moved during this period except as may
be necessary* the the end of fourteen (14) days to remove the forms.
FORI.n .
Forms shall be substantial, unyielding and so constructed
tl the concrete donforms to the designed dimensions, and shall
also be tight to prevent the leakage of :mortar. The forms for
exposed surfaces shall be sound lumber, planed to a uniform thickness
either tongued and grooved or with edges beveled to make tight
joints after erection. If, during the placing of the concrete, the
forms shoe signs of bulging or sagging at any point, that portion
of the concrete causing the distortion shall be immediately removed
and the forms properly supported before continuing the work. The
supports for bridge floors, beams, girders, caps, columns, etc.,
shall regain in place twenty -one (21) days. Forms shall be filleted
at all sharp corners and in case of all projections such as girders,
beams, copings, etc., the forms shall be given a bevel or a draw
sufficient to insure their easy removal. Forms for reinforced
concrete piles shall remain in place fourteen (14) days.
Forms shall be painted withi• boiled linseed oil or other
equally good preparation to prevent the concrete from adhering to
the forms. Crude oil or any material such as tar paper that
will stick to or discolor the concrete will not be permitted to be
used.
Great care must be taken to secure perfect alignment of
rails and girder forms. Local kinks should be taken out before
the concrete is placed.
PLACING REINFCRCEMENT.
Reinforce:ment shall be placed in the exact locations
shown on the plans and wired at intersections so that it mill not
become disarranged during the depositing of concrete. when bars
are spliced, the ends of the reinforcing bars shall be overlapped
a distance equal to forty (40) times the diameter or thickness
of the bar or rod. Splices at points of maximum stress will not be
permitted.
Steel shell not be laid directly on forms and raised
during placing of concrete by prying it up and wor;:ing concrete
under it, but should be firmly held in place by ir.etallic supports,
spacer bars, wires or other devices edequute to insure against
displacement during construction, which may reraein when the concrete
is placed. In general, all steel shall be sa,.rrely placed before
any concrete is deposited.
EXPANSION JOINTS.
Expansion joints shall be placed where indicated on the
plans, and Shall be provided by placinb 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 hibh tirade woolfelt alon5
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.
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GENERAL REQUIREMENTS .
TVORK
=0. "
The Contractor shall, for the price bid, furnish all
the materials to execute the Work in every respect in a thorough
and - orkmanlike xanner, in accordance with the plans and soecifi-
cations, and to the satisfaction of the Street Superintendent.
N.ATERIALS AND SAYPLFS .
All materials *.must be of specified quality and fully
equal to the samples, when samples are required. The Contractor
shall furnish to the Engineer for test, Whenever called for and
free of charge, samples of all materials proposed to be used in
the work. Rejected material must be immediately removed ffom the
work by the Contractor.
LP BOR .
P
Any overseer, superintendent, laborer or other person
employed by the Contractor on the, work, lvho shall perform work
in a manner contrary to these specifications, shall be discharged
immediately and such person shall not again be employed on the work.
EXA11'NATION OF GROUND.
Bidders must exaruine and judie for thelmselves as to the
location of the proposed *.Work, and the nature of the excavation
to be made and the Work to be done.
SETTING STAKES,
The Contractor shall give 24 hours notice in writing
When he will require the services of the'Engineer for laying out
any portion of the Work.
He shall dig all stake holes necessary to give lines and
levels. The Contractor shall preserve all stakes set for the
lines, levels or measurements of the work in their proper places
until authorized to remove them by the Engineer, and any expense
incurred in replacing said stn':es which the Contractor or his
subordinates may have failed to preserve shall be borne by the
Contractor.
PLANS AND SPECIFICATIONS.
The Contractor sh311 keep upon the ?Work a copy of the
plans and specifications, and access thereto shall at all times
be accorded the Engineer or Inspector.
INSPECTORS.
The Contractor shall prosecute work only in the presence
of an Engineer or Inspector, appointed by the Street Superintendent
and any work done in the absence of said Engineer of Inspector
will be subject to rejection. The Contractor, -hall furnish the
Engineer and Inspector reasonable facilitiies far obtaining such
Information as may be necessary to give `hem `.77. izforYiation ct
all times respecting the progress and raenner of the, c *crk and The
character of the materials.
PRESERVATION OF MONUMENTS.
The Contractor shall not disturb any monuments or stakes
found on the line of improvements, until ordered oy the Engineer,
and he shall bear the expense of re- sett4n6 any mon"Lments or stakes
which may be disturbed without orders.
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RWOVING OBSTRUCTIONS.
The Contractor shall re.Tiolre all trees, stones, debris,
and other obstructions that may be encountered in making said
improvements.
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 passageway and protecting the sa+:Te where they are
exposed or danberous to travel.
BARRIERS, LIGHTS, ETC.
The Contractor shall take all necessary measures to
protect the work and prevent accidents during construction. He
shall maintain and provide all necessary barriers, guards, tem-
porary bridges, watchmen and li6hts.
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
Street Superintendent. to move such property within a specified
reasonable time, and the Contractor shall not interfere with said
property until after the expiration of the ti:e 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 chanties of their property that may be made necessary
by the work. The City shall also have the privilege of entering
upon the street for the purpose of repairing culverts or storm
drains.
LOSS OR DAMAGE
All loss or damage arising fro:' any unforseen obstruction
or difficulties, either natural or artificial, which may be
encountered in the prosecution of the work, or from any action of
the elements, or from any act or omission not authorized by these
specifications, on the part of the Contractor, or any agent or
person employed by him, shall be sustained by the Contractor.
DEFECTIVE "PORK.
No work which may be defective
deficient in any of the requirements of
be considered as accepted in consequence
officer of the City, or Inspector connec
point out said defect or deficiency duri
Contractor shall;O'orrect any imperfect m
before the final acceptance of the work.
in its construction or
these specifications will
of the failure of any
ted with the work, to
no construction, and the
ork, whenever discovered,
PROTECTION OF M.RK AND CLEANING UP.
The Contractor shall card for all work until final com-
pletion and acceptance. He shall re.ove all surplus .aterial and
rubbish from the work after its coipletion and before he makes
application for the acceptance of the - or',c.
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FINAL INSPECTION.
The Contractor shall notify the Street Superintendent
T, en he desires a final inspection of thewcrk when the latter
,�d li; as soon as possible, make the necessary examination, and if
the -7ork is found in co:^plianee with these specifications, the
Street Superintendent will furnish the Contractor with a certifi-
cate to that effect.
ALLOWABLE VARIATION.
Iten in these Specifications a maximum or minimum,
either in size, percentage or thickness, or re)Ating to quality or
character, or other matter, is allowed or prescribed, the work
shall be accepted as in compliance therewith if within such max-
imum or minimum so allowed hereby.
DEFINITIONS
whenever the word "City" is used in these Specifications
it refers to the City of Newport' Beach, California.
whenever the word "Contractor" is used in these specifi-
cations, it refers to the party or parties of the second part in
the agreement for the construction of the work herein specified.
*Whenever the words "Superintendent" or It Engineer" are used
in these Specifications, they refer respectively to the "Street
Superintendent" or "City Engineer', of the Ctty of Ne -port Beach,
or their authorized agents or inspectors.
'.Passed and approved this /</z, I day of F bruary, 1928.
layor- —
ATTEST:
ty Clerk.
STATE OF CALIFORNIA )
COUNTY OF ORANGE ( as.
CITY OF NEWPORT BEACH )
I, w , City Clerk of the
City of Newpor 1 c , do hereby certify that the foregoing
Resolution, being Resolution No. y , was adopted by the City
Council of the City of Newport Beach, signed by the Mayor of said
City, and attested by th City Clerk, all at a regular meeting
thereof held on the /i{Lt day of February, 1928, and that the
same was adopted by TEF-following vote, to -wit: e
AYES: Councilmen,�"�°'
HOES: Councilmen, '77i 4 ,
Go ABSENT: Councilmen,
_ t�City Clerk of t Beac .
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