HomeMy WebLinkAbout391 - Specifications 41 - Concrete Retaining Wall. RESOLUTION NO.
A RESOLUTION OF THE BOARD OF TRUSTEES OF THE
CITY OF NEWPORT BEACH ADOPTING SPECIFICATIONS
NO. 41 FOR THE CONSTRUCTION OF CONCRETE RE-
TAINING WALLS WITHIN SAID CITY.
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Be it resolved by the Board of Trustees of the City of
Newport Beach that the following Specifications, to be known as
Specifications No. 41, for the construction of concrete retaining
walls in the City of Newport Beach, be, and the same are, hereby
adopted.
WORK TO BE DONE
Under these specifications the Contractor will be
required:
1. To excavate or fill in to such an extent and in such
manner as may be required by the plans, profiles and cross - sections,
and these specifications, the area upon which the improvement
hereinafter provided for is to be constructed.
3. To furnish all materials as hereinafter provided for and
required for the construction and Completion of the improvement, in
accordance with the plans and specifications, and all labor, tools
and equipment necessary for the performance of said work.
3. To construct the concrete retaining wall as hereinafter
specified... ' , . ;x%
CONCRETE RETAINING VALL
CONCRETE :
The concrete for the retaining wall shall be composed
of the following materials and in the following proportions, to-
wit:
One (1) part of Portland cement by volume to 4.60 parts
of mixed aggregate by volume. The mixed aggregate shall be com-
posed of a combination of sand and of gravel or broken stone.
The sand and the gravel or broken stone shall be measured sepa-
rately by volume, and the parts by volume of each of the said
materials required, which, when combined will be equal to the 4.60
parts of mixed aggregate hereinbefore mentioned, shall be determined
by the following formulas:
A - 6.40
C = 5.80 -
-A -_ -B
D= 5.80 -C
Where A
is the
fineness modulus
of the gravel or broken stone.
°
B
is the
fineness modulus
of the sand.
C
equals
the parts of sand
by volume.
D
equals
parts of gravel
or broken stone by volume.
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The fineness modulus of the sans} and the gravel or broken
• stone shall be determined by a sieve analysis, using the following
sizes of standard sieves:
100 -mesh, 48 -mesh, 28 -mesh, 14 -mesh, 8 -mesh, 4 -mesh,
3/811 -mesh, 3/4n -mesh, and 1 1/211 -mesh.
The sum of the percentages of material by weight of the
sample coarser than each of the respective sizes of the standard
sieves hereinbefore mentioned, divided by 100, is the fineness
modulus of the material.
The volume of cement per cubic yard of concrete in place
shall not be less than 5.90 cubic feet nor more than 6.10 cubic
feet.
Said materials shall conform to the following specifi-
cations: A sack of cement weighing ninety -four (94) pounds net
shall be considered as having a volume of one cubic foot.
CONCRETE MATERIALS
Including cement, sand, gravel, broken stone, and water
and for all purposes shall conform to the following 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.
(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 prescribed by the Specifications
of the American Society for Testing Materials, hereinbefore re-
ferred to. Neat briquettes will be compacted by light tamping.
Mortar briquettes shall be mixed to a state of plasticity corre-
sponding as nearly as possible to normal consistency in neat bri-
quettes.
(b) FINENESS: The cement must be evenly ground,and when
tested with the following standard sieves, must pass at least the
following percentages by weight:
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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.
(d)
TENSILE
STRENGTH: Neat briquettes one inch
square in
section shall
attain a minimum strength as follows:
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•
At 24 hours in moist air
- 175
lbs.
At 7 days 1 day in moist
At 28 days(l day in moist
air
air
and six in water)- 500 lbs.
and 27 days in water) -
600 pounds.
Briquettes one inch. square
in
section, made of one part
.of cement, three parts of standard
testing
sand, shall attain a
minimum strength as follows:
At 7 days (1 day in moist air and 6 days in water) 200 lbs.
At 28 days(1 day in moist air and 27 days in water)275 lbs.
The sand test must in all cases show an increase in strength
at 28 days over the 7 -day tests.
(a) SOUNDNESS: Pate of nedit cement about three inches in
diamater, one -half inch thick at the center, and tapering to a thin
edge, will be kept in moist air for a period 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 pate, to satisfactorily pass the requirements, must
remain firm and hard, and must not show any signs of distortion,
checking, cracking, blotching or disintegrating.
(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 arwhich 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 corrosion of rock.
Sand shall be free from oil and organic matter. It shall
be thoroughly and 4niformly washed and must not contain more than
3% by weight of silt, loam, clay or other foreign matter. Not less
than 15% and not more than 35% shall pass a No. 30 -mesh sieve, and
not less than 8516 and not more than 950%, shall pass a no. 4 -mesh
sieve, and not less than 950 shall pass a No. 3 sieve, and all shall
pass a 3/811 sieve.
Briquettes lit square in section, made of one (1) part
of cement, conforming to these specifications, and(3) three parts
of the above sand, sha111attain a minimum tensile strength equal
to that required for standard sand at equal periods of time.
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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, and 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 mounted on a horizontal shaft and having a shelf
four inches wide extending from end to end.
]wring the test the rattler shall be revolved at a rate
of between 28 and 30 revolutions per minute. A charge for the
rattler shall consist of the said five kilogram sample and fourteen
cubical blocks of cast iron with rounded corners and edges, said blocks
measuring about one and one -half inches in each dimension and having
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 19 -mesh screen,
which shall be considered and designated as the loss.
WATER.
Water shall be clean, free from oil, acid,
vegetable matter. The amount of water to be used i n
not be less than 5.8 nor more than 6.00 gallons per
Cement, which includes water already in the concret e
in measuring the water, allowance shall be made for
in said materials.
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alkali or
a batch shall
sack of Portland
materials, and
water contained
GRAVEL OR 13ROKEA STONE.
•
Coarse aggregate shall be sound crushed
or both. of
rock or washed
coarse aggregate
gravel, combination of The particles
shall be of clean, hard, tough, durable material,
free from vegetab &e
or other deleterious sutstances. It shall be free from dirt, mud
or stone dust.
Coarse aggregate as furnished shall be uniformly graded fmom
the largest to the smallest screen sizes given below
and in addition
shall conform to the following tests:
Men analyzed by laboratory screens and
sieves coarse
aggregate shall conform to grading requirements as
follows:
Passing screen having 3 1/2" circular openings -
10 CON by wt.
Passing screen having 2 1/21, circular openings -
90fo to 1001p by wt.
Passing screen having 1 1/2" circular openings -
6 to 8Qj'o by wt.
Passing screen having 3/411 circular openings -
300 to 5(�lo by wt.
Gravel shall not show a loss of more than 32% and broken
stone shall not show a loss of more than 22% when
sulijected 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, and 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 mounted on a horizontal shaft and having a shelf
four inches wide extending from end to end.
]wring the test the rattler shall be revolved at a rate
of between 28 and 30 revolutions per minute. A charge for the
rattler shall consist of the said five kilogram sample and fourteen
cubical blocks of cast iron with rounded corners and edges, said blocks
measuring about one and one -half inches in each dimension and having
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 19 -mesh screen,
which shall be considered and designated as the loss.
WATER.
Water shall be clean, free from oil, acid,
vegetable matter. The amount of water to be used i n
not be less than 5.8 nor more than 6.00 gallons per
Cement, which includes water already in the concret e
in measuring the water, allowance shall be made for
in said materials.
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alkali or
a batch shall
sack of Portland
materials, and
water contained
• MEASURING MATERIALS
The sand or stone screenings and the gravel or broken
stone shall be measured in boxes which shall have the capacity
necessary to accurately maintain the proportions hereinbefore
mentioned. Said material shall be measured loose, without shaking
or compacting. in
Cement /sacks, as above specified, shall be dumped directly
into the mixer. The water necessary for every batch shall be
accurately measured with an apparatus which will prevent the use of
more water than above specified. No.mixer whall be used which
is not provided with an accurate water measuring device or apparatus.
;FIXING CONCRETE.
All mixing of concrete shall be done in a batch mixer.
The mixer shall be charged with cement and sufficient sand
and gravel or broken stone to conform to the proportions hereinbefore
stated. Sufficient watervi 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 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 discharged from the said
drum At least 75 seconds must elapse between the placing of
successive batches in the mixer.
CONSISTENCY OF CONCRETE_
The concrete, after being mixed as hereinbefore specified,
whall, when subjected to the following test, have a slump of not
less than eight per cent nor more than twenty per cent. The slump
test shall be made in the following manner: The test tube to be
used in making the slump test shall have an inside diameter of eight
inches at the base and an inside diameter of four inches at the top,
and a perpendicular height of twelve inches. Immediately after the
concrete has been mixed, a sufficient quantity thereof shall be
placed in four layers in the tapered 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 minute, its height shall be maaeured
and subtracted from the original height of twelve (12) inches, which
difference in height is the amount of the slump in inches from which
the percentage of slump shall be determined.
TESTS OF CONCRETE.
The concrete composed of the materials, proportions,
consistency, mixing, etc., provided for in these specifications must
be of such quality and chardoter 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 determining compressive strength
shall consist of a cylinder of the concrete to be tested 6 inches
in diameter, and 12 inches in height. The test specimen for de-
termining modulus of rupture shall consist of a beam of the concrete
to be tested, 6 inches in width, 6 inches in thickness and 36 inches
in length.
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&les of the concrete to be tested shall be taken
immediately after the concrete has ledt the mixer and deposited
' on the sub - grade, and molded in^ 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 mold. The test specimen, after
molding, shall be covered to protect same from injury, and buried
in damp sand, and at the end of 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 moldin the specimen, it shall
be uncovered and air -cured for sixteen (16� days, and tested at the
end of twentyseight (28) days.
PLACING CONCRETE
The concrete shall be placed in a manner to insure a
smooth surface next to the forms, and shall be thoroughly spaded
and worked into the recesses of the forms. The concrete shall be
spread in layers not exceeding 6„ in thickness, and each layer
thoroughly tamped before placing the next layer.
RE- MIXING OF CONCRETE
No concrete shall be used that shows evidence of having
set, or that has become unfit for good work from standing too long
or from any other cause, and no re- mixing of concrete will be
permitted.
FORMS.
Forms shall be true and straight, free from warp and of
sufficient strength to resist springing out of shape, and shall
also be tight to prevent the leakage of mortar. The forms for
exposed surfaces shall be sound lumber .planed to uniform thickness,
either tangued acid grooved or edges beveled so as to insure tight
4oints. They shall be painted with boiled linseed oil or other
preparation equal in quality 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.
FINISHING.
After the concrete has been placed and sufficiently
tamped until free mortar appears on the surface, I-I shall be
brought to a smooth and even surface by the use of a wooden float
after which no disturbing of any character of the surface will be
allowed. The application of neat cement to the surface in order
to hasten the hardening is prohibited.
PROTECTION AND CURING
The concrete shall be protected from sun and wind and
kept moist for a period of at least ten days.
EXPANSION JOINTS.
Expansion joints shall be placed for the full width and
depth of the concrete retaining wall where indicated on the plans,
- 6 -
• profiles and cross - sections. Said expansion joints shall be
formed by painting the end of the wall with asphalt cement, apply -
ingit in such quantities that the thickness will not be less than
1 /8n nor more than 1/411. The asphalt cement used must be homo-
genous, and its consistency at the time of using must fall within
the limits of 60 and 80 degrees penetration by the District of
Columbia Standard. It must be of such quality that it will not
become hard or brittle in cold weather, or soft and run out in
hot weather.
J
GENERAL REQUIREMENTS
WORK.
The Contractor shall, for the price bid, furnish all the
materials to execute the work in every respect in a thorough and
workmanlike manner, in accordance with the plane and specifications,
and to the satisfaction of the Street Superintendent.
MATERIALS AND SAMPLES.
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 th-e
work. Rejected material must be immediately removed from the work
by the Contractor.
LABOR.
Any overseer, superintendent, laborer or other person
employed by the Contractor on the work, who 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.
EMINATION OF GROUND.
Bidders must examine and judge for themselves 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 stakes which the Contractor or his
subordinates may have failed to preserve shall be borne by the
Contractor.
PLANS AND SPECIFICATIONS.
The Contractor shall keep upon the work a copy of the
plans and specifications, and access thereto shall at all times
be accorded the Engineer or Inspector.
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INSPECTORS
The Contractor shall "prosecute work only in .the presence
of an Enginee3i or Inspector, appointed by the Street Superintendent,
and any cork done in the absence of said Engineer of Inspector
±rill be subject to rejection. The Contractor shall furnish the
Engineer and Inspector reasonable facilities for obtaining such
information as may be necessary to give them full information at
all times respecting the progress and manner of the work 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 by the Engineer,
and he shall bear the expense of re- setting any monuments or stakes
which may be distrubed without orders.
REMOVING OBSTRUCTIONS.
The Contractor shall remove 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 streeti�,
keeping open passageways and protecting the same where they are
exposed or dangerous 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 lights.
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 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 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
4P drains.
LOSS OR DAMAGE
All loss or damage arising from any unforseen obstruction
or difficulties, either natural or artificial, which may be en-
countered 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.
MIE
DEFECTIVE TMK .
No work which may be defective in its construction or
deficient in any of the requirements of these specifications, will
be considered as accepted in consequence of the failure of any
officer of the City, or Inspector connected with the work, to point
out. -said defect or deficiency during construction, and the Contractor
shall correct any imperfect work, whenever discovered, before the
final acceptance of the work.
PROTECTION OF WORK AND CLEANING UP
The Contractor shall care for all work until final com-
pletion and acceptance. He shall remove all surplus material and
rubbish from the work after its completion and before he makes
application for the acceptance of the work.
FINAL. INSPEOTION.
The Contractor shall notify the Street Superintendent when
he desires a final inspection of the work, when the latter will, as
soon as possible, make the neoessary examination, and if the work
is found in compliance with these specifications, the Street Super=
intendent will furnish the Contractor with a certificate to that
effect.
ALLOWABLE VARIATION
When in these specifications a maximum or minimum, either
in size, percentage or thickness, or relating to quality or character
or other matter, is allowed or prescribed, the work shall be ac-
cepted as in compliance therewith if within such maximum or minimum
so allowed thereby.
DEFINITIONS.
Vhenever 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 specifica-
tions, 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 "Engineerti are used
in these specifications, they refer respectively to the 'Street
Superintendent" or IfCity Engineer" of the City of Newport Beach, or
their authorized agents or inspectors.
Passed and approved this day of 1926.
i
President o the Bo rd of Trustees.
C4
ATTEST: yz
City Clerk.
O'M
STATE OF CALIFORNIA }
COUNTY OF ORANGE
CITY OF NEWPORT BEACH }
City Clerk of the
City of Newport Beach, do hereby certify that the foregoing
Resolution, being Resolution No. ?VL, was regularly introduced
and duly adopted by the Board of Trustees of said City, signed by
the president of said Board, and attested by the City Clerk, all
at a regular meeting thereof held on the day of
1926, and that the same was adopted by the
following vote, to -wit:
AYES: Trustees ,A lkr�Fson, %oun9 iY��di+*ro�,
NOES: Trustees, noh e
ABSENT: Trustees.
City ClerjW of the City of Newport Beach.
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