SECTION 03300 CAST-IN-PLACE CONCRETE

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)

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-
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S
ECTION 03300


CAST
-
IN
-
PLACE CONCRETE


PART 1

GENERAL


1.1

SCOPE


The work specified in this Section includes schedules, notes, and details for the
construction of cast
-
in
-
place concrete structures, landings, equipment piers,
housekeeping pads and slabs on grade.


1.2

RELATED WORK SPECIFI
ED ELSEWHERE


Section

Item

01300

Submittals

01400

Quality Control
-
Contractor Provided

03
2
00

C
oncrete Reinforcement


1.3

REFERENCES


This Section references the latest revisions of the following documents:


Reference

Title

ACI 117

Specifications for Tolerances for Concrete Construction
and Materials and Commentary

ACI 212.3

Chemical Admixtures for Concrete

ACI 301

Specifications for Structural Concrete

ACI 304

Guide for Measuring, Mixing, Transporting, and Placing
Concrete

ACI 305

H
ot Weather Concreting

ACI 306

Cold Weather Concreting

ACI 309

Guide for Consolidation of Concrete

ACI 318

Building Code Requirements for Structural Concrete and
Commentary

ACI 350

Code Requirements for Environmental Engineering
Concrete Structures and Comm
entary

ACI 347

Guide to Formwork for Concrete

ACI 350.1

Tightness Testing of Reinforced Engineering Concrete
Structures and Commentary

ASTM C31

Making and Curing Concrete Test Specimens in the Field

ASTM C33

Concrete Aggregates

ASTM C39

Compressive Strengt
h of Cylindrical Concrete Specimens

ASTM C42

Obtaining and Testing Drilled Cores and Sawed Beams of
Concrete

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ASTM C94

Ready
-
Mixed Concrete

ASTM C131

Resistance to Degradation of Small
-
Size Coarse Aggregate
by Abrasion and Impact in the Los Angeles Machine

ASTM C143

Slump of Hydraulic Cement Concrete

ASTM C150

Portland Cement

ASTM C172

Sampling Freshly Mixed Concrete

ASTM C173

Air Content of Freshly Mixed Concrete by the Volumetric
Method

ASTM C231

Air Content of Freshly Mixed Concrete by the Pressure
Method

ASTM C260

Air
-
Entraining Admixtures for Concrete

ASTM C309

Liquid Membrane
-
Forming Compounds for Curing
Concrete

ASTM C494

Chemical Admixtures for Concrete

ASTM C535

Resistance to Degradation of Large
-
Size Coarse Aggregate
by Abrasion and Impact in the Lo
s Angeles Machine

ASTM C618

Coal Fly Ash and Raw or Calcined Natural Pozzolan for
Use as a Mineral Admixture in Concrete

ASTM C881

Epoxy
-
Resin
-
Base Bonding Systems for Concrete


1.4

SUBMITTALS


Submittals shall be in accordance with Section 01300.


A.

GENERAL


The submittal for each included concrete mix shall include, as a complete
package, the following as defined below:


1.

Concrete Mix Design


2.

Certified Test Results


3.

Sieve Analysis


4.

Product Data


An incomplete concrete mix submittal package may render a rejecti
on of
the mix or could delay the review process.


B.

CONCRETE MIX DESIGN


Submit mix design for the proposed mix to be used on the Project,
indicating components, and proportions by weight, including any
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admixtures. Mix design shall state chloride content.
Mix designs to be
provided are:


1.

Unspecified Concrete for Liquid Containment Structures


2.

Unspecified Concrete


3.

Lean Concrete


4.

Cement Grout


C.

CERTIFIED TEST RESUL
TS


Submit laboratory test results indicating compressive strength of concrete
in compliance wit
h requirements specified herein and in accordance with
ACI 301.


D.

SIEVE ANALYSIS


Submit sieve analysis for proposed coarse and fine aggregates indicating
components, source, gradation, and WSDOT aggregate source approval
report, including WSDOT Aggregate S
ource ID.


E.

PRODUCT DATA


Provide product data on all proposed admixtures, accessories, and
embedded items to be used on the Project, including, but not limited to:


1.

Cement; source and type


2.

Air Entraining Agent


3.

Water Reducing Admixtures


4.

Pozzolans


5.

Bonding Agents


6.

Curing Compounds/Floor Hardeners


7.

Non
-
Shrink Grout; Non
-
metallic and Metallic


8.

Plastic Joint Formers



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For admixtures other than those proposed for air entrainment, submit a
letter from the manufacturer describing the benefits of its use fo
r the
project and effect of its use on the properties of the concrete. Product data
shall expressly state admixtures are chloride free, or the manufacturer
shall submit a letter certification stating the same.


F.

MATERIAL DELIVERY TI
CKETS


Provide copies of

all concrete and grout material delivery tick
ets for the
Project to the Engineer
.


1.5

QUALITY ASSURANCE


Perform work in accordance with ACI 301. Acquire cement and aggregates from
same source for all work performed on the Project. Conform to ACI 305 when
concreting during hot weather. Conform to ACI 306 when concreting during cold
weather. Provide or coordinate field and laboratory testing as described later in
this Section and under provisions of Section 01400.


1.6

COORDINATION


Coordinate work in accordan
ce with provisions of Section 01310. Coordinate the
placement of embedded items with erection of concrete formwork and placement
of form accessories.


PART 2

PRODUCTS


2.1

FORM MATERIALS


A.

FORMS FOR EXPOSED FI
NISH CONCRETE


Plywood, metal, metal
-
framed plywood faced,

or other acceptable panel
-
type materials, to provide continuous, straight, smooth, exposed surfaces.
Furnish in largest practicable sizes to minimize number of joints and to
conform to jo
int system shown on the Plans
.


B.

FORMS FOR UNEXPOSED
FINISH CONCRETE


Plywood, lumber, metal, or other acceptable material. Provide lumber
dressed on at least two edges and one side for tight fit.


C.

FORMS FOR CYLINDRICA
L COLUMNS AND SUPPOR
TS


Metal, fiberglass reinforced plastic, or paper or fiber tubes. Construct
paper o
r fiber tubes of laminated plies using water
-
resistant adhesive with
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wax
-
impregnated exterior for weather and moisture protection. Provide
units with sufficient wall thickness to resist loads imposed by wet concrete
without deformation.


D.

FORM COATINGS


Provide commercial formulation form
-
coating compounds that will not
bond with, stain, or adversely affect concrete surfaces, and will not impair
subsequent treatments of concrete surfaces.


E.

FORM TIES


Factory
-
fabricated, adjustable
-
length, removable or sna
poff metal form
ties, designed to prevent form deflection and to prevent spalling of
concrete upon removal. Provide units, which will leave no metal closer
than 1
-
1/2 inches to surface. Un
less noted otherwise on Plans
, provide ties
with plastic cone devi
ces which, when removed, wil
l leave holes not
larger than 1
-
inch diameter in concrete surface.


2.2

CONCRETE MATERIALS


A.

CEMENT


ASTM C150, Type II


Moderate or Type I
-

II. Use one brand of cement
throughout the project, unless othe
rwise app
roved by
the Engi
neer
.
Provide low alkali cement where Alkali
-
Silica Reaction (ASR) mitigation
measures are required by WSDOT Aggregate Source Approval.


B.

FINE AND COARSE AGGR
EGATES


Comply with ASTM C33. Provide aggregates from a single source.
Coarse aggregate shall be

size designation 467 (Nominal size 1
-
1/2 inch to
No. 4 sieve) for all liquid containing structures, and size designation 67
(Nominal size 3/4
-
inch to No. 4 sieve) for all other concrete. Aggregates
shall show a loss of weight not exceeding 35 percent aft
er 500 revolutions
in a Los Angeles wear machine, when tested in accordance with ASTM
C131 or ASTM

C535. Aggregates shall be from a WSDOT approved
source.


C.

WATER


Clean, potable, and not detrimental to concrete, in compliance with
ASTM

C94.



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2.3

ADMIXTURES


Except for air entrainment, use of all other admixtures used shall be
subject to
approval of the Engineer

and at no additional cost to the Owner. Only admixtures
expressly stated by the manufacturer as being chloride
-
free shall be used. Subject
to comp
liance with requirements, products, which may be incorporated into the
work include, but are not limited to, the following:


A.

AIR ENTRAINMENT


ASTM C260 certified by manufacturer to be compatible with other
proposed admixtures.


Master Builders MB AE 90 or
MICRO
-
AIR

Sika AER

W.R. Grace Daravair or Darex Series


B.

WATER REDUCING ADMIX
TURE


ASTM C494 Type A.


Master Builders PolyHeed

Sika Plastocrete 161

W.R. Grace WRDA Series


C.

ACCELERATING ADMIXTU
RE


ASTM C494 Type C.


Master Builders Pozzolith NC534

Sika Plast
ocrete 161 FL

W.R. Grace Polarset or DCI


D.

WATER REDUCING, RETA
RDING ADMIXTURE


ASTM C494, Type D.


Master Builders Pozzolith 100XR

Sika Plastiment

W.R. Grace Daratard Series


E.

WATER REDUCING, ACCE
LERATING ADMIXTURE


ASTM C494, Type E.


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Euclid Chemical Co.
Accelguard 80

Master Builders Pozzutec 20

W.R. Grace Daraccel


F.

HIGH RANGE WATER RED
UCER (HRWR)


ASTM C494, Type F.


Master Builders Rheobuild 1000/3000 FC

Sika Sikament 10 ESL

W.R. Grace ADVA 100


G.

HIGH RANGE WATER RED
UCER AND RETARDER


ASTM C494, Type G.


Master Builders Pozzolith 440N

W.R. Grace Daracem
-
100


H.

POZZOLAN


ASTM C618
-

CLASS F, with a CaO maximum content of 10 percent.


2.4

ACCESSORIES


A.

BONDING AGENT


ASTM C881, Type I and II, Grade 2, Class C, Epoxy Resin. Subject to
Contract requirements,
provide one of the following or equal:


Sika Armatec 110

Conspec SpecBond 100

W.R. Meadows Sealtight Rezi Weld 1000


B.

CURING COMPOUND/CHEM
ICAL FLOOR HARDENER


ASTM C309, Type I, Class A and B. Subject to Contract requirements,
provide one of the following
or equal:


W.R. Meadows Sealtight 1100
-
Clear

Conspec RX cure

Chemrex, Inc. Masterkure

Burke Spartan
-
Cote WB



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C.

GENERAL PURPOSE NON
-
SHRINK NON
-
METALLIC GROUT


Premixed compound consisting of non
-
metallic aggregate, cement, water
reducing and plasticizing age
nts; capable of developing minimum
compressive strength of 2,400 psi (17 Mpa) in 48 hours and 7,000 psi
(48

Mpa) in 28 days. Subject to Contract requirements, provide one of the
following or equal:


Sika SikaGrout 212

Conspec 100 Non Metallic

Chemrex
, Inc. Masterflow 928 Grout

W.R. Meadows Sealtight 588


D.

PLASTIC JOINT FORMER


Provide and install, per manufacturer’s recommendati
ons, where shown on
the Plans

or at lo
cations approved by the Engineer
. Subject to compliance
with requirements, manufacturer
s offering products, which may be
incorporated in the work, include, but are not limited to, the following:



Greenstreak

Vinylex Corporation

W.R. Meadows


2.5

CONCRETE MIX


A.

GENERAL


Prepare design mixes for each type and strength of concrete by either
laborat
ory trial batch or field experience methods as specified in ACI 301.
If trial batch method is used, use an indepen
dent testing facility acceptable

to the
Engineer

for preparing and reporting proposed mix designs. The
testing facility shall not be the sam
e as that used for field quality control
testing.


The maximum water soluble chloride ion content, expressed as a percent
of the cement, contributed from all ingredients of the concrete mix,
including water, aggregates, cementitious materials, and admixtur
es, shall
not exceed 0.10 percent. Pozzolans may be counted as part of the total
cementitious material in the concrete mix design. The cementitious
material is the “minimum cement content” specified in the mix design for
each type of concrete. When pozz
olans are used as part of this “cement
content,” the minimum content shall be 15 percent by weight of the total
cementitious materials (Portland cement and pozzolans) and not more than
20 percent.

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Where ASR mitigation measures are required by WSDOT, provi
de a
minimum of 15 percent pozzolan included in the cementitious material in
the design mix.


B.

MIX DESIGNS


Provide normal weight concrete with the following properties, unless

noted otherwise on the Plans
.


1.

Unspecified Concrete for Liquid Containment
Structures


Structural concrete of general use in liquid containment structures.


Minimum c
ompressive strength @ 28 days:

4
,
0
00 psi

Minimum cement content:

6 sacks per cubic yard

Maximum water cement ratio by weight:

0.45

Nominal coarse aggregate size:


1
-
1/2" to No.
4


(size designation 467)


2.

Unspecified Concrete


Structural concrete of general use in structures, sidewalks, and
where no specific class of concrete is designated.


Minimum compressive strength @ 28 days:

3,500 psi

Minimum cement content:

5.
5

sacks per cubic yard

Maximum water cement ratio by weight:

0.45

Nominal coarse aggregate size:

3/4" to No. 4

(size designation 67)


3.

Lean Concrete


Concrete for pipe thrust blocks or for use as noted as

“Concrete
Fill” on the Plans
.


Minimum compressive
strength @ 28 days:

2,500 psi

Minimum cement content:

5 sacks per cubic yard


4.

Cement
G
rout


Material for filling guard posts, grouting of clarifier bottoms or for
oth
er uses as shown on the Plans
. Cement grout shall be sand and
cement only and shall not c
ontain coarse aggregate.


Minimum compressive strength @ 28 days:

2,500 psi

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Minimum cement content:

6.5 sacks per cubic yard

Maximum water cement ratio by weight:

0.54


C.

ADMIXTURES


1.

Air Entrainment


Use air
-
entraining admixture in all exterior exposed concr
ete. Add
air
-
entraining admixture at manufacturer’s prescribed rate to result
in concrete at point of placement in accordance with ASTM C173
or C231 having total air content with a tolerance of plus or minus 1
percent within the following limits:


5.5 per
cent for 1.5 inch max. coarse aggregate size

6.0 percent for 1.0 inch max. coarse aggregate size

7.0 percent 0.50 inch or less max. coarse aggregate size


2.

Other Admixtures


Use of all other admixtures shall be subject to
the approval of the
Engineer
, and s
hall be in accordance with ACI 212.3 and
Manufacturer’s recommendations. Only admixtures stated by the
manufacturer to be chloride free shall be used.


D.

SLUMP LIMITS


Proportion and design mixes to result in concrete slump (1 inch ± of the
maximum) at the
point of placement in accordance with ASTM C143 as
follows:


Ramps, slabs, and

sloping surfaces:


3 inches.


Reinforced foundation systems:


3 inches.


Other concrete:


4 inches.


Concrete containing HRWR admixture (super
-
plasticizer):


Not more than
8

inc
hes after addition of HRWR to site
-
verified 2
-

to 3
-
inch slump
concrete.


E.

CONCRETE MIXING


Comply with requirements of ASTM C94, and as herein specified.


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During hot weather, or under conditions contributing to rapid setting of
concrete, a shorter mixing
time than that specified in ASTM C94 may be
required.


PART 3

EXECUTION


3.1

GENERAL


Coordinate the installation of joint materials and vapor barriers with placement of
forms and reinforcing steel.


3.2

FORMS


Design, erect, support, brace, and maintain formwork to supp
ort vertical and
lateral, static, and dynamic loads that might be applied until such loads can be
supported by concrete structure. Construct formwork so concrete members and
structures are of correct size, shape, alignment, elevation, and position. Maint
ain
formwork construction tolerances complying with ACI 347.


Design formwork to be readily removable without impact, shock, or damage to
cast
-
in
-
place concrete surfaces and adjacent materials.


Construct forms to sizes, shapes, lines, and dimensions shown, and to obtain
accurate alignment, location, grades, level and plumb work in finished structures.
Provide for openings, offsets, sinkages, keyways, recesses, moldings, rustications,
reglets, ch
amfers, blocking, screeds, bulkheads, anchorages and inserts, and other
features required in the work. Use selected materials to obtain required finishes.
Solidly butt joints and provide back up at all joints to prevent leakage of cement
paste.


Fabricat
e forms for easy removal without hammering or prying against concrete
surfaces. Provide crush plates or wrecking plates where stripping may damage
cast
-
in
-
place concrete surfaces. Provide top forms for inclined surfaces where
slope is too steep to place
concrete with bottom forms only. Provide Kerf wood
inserts for forming keyways, reglets, recesses, and the like, to prevent swelling
and for easy removal.


Provide temporary openings where interior area of formwork is inaccessible for
cleanout, for inspec
tion before concrete placement, and for placement of concrete.
Securely brace temporary openings and set tightly to forms to prevent loss of
concrete mortar. Locate temporary openings in forms at inconspicuous locations.

Chamfer all exposed corners and e
dges and other areas shown on the
Plan
s, using
wood, metal, PVC, or rubber chamfer strips fabricated to produce uniform smooth
lines and tight edge joints.


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Provisions for Other Trades: Provide openings in concrete formwork to
accommodate work of other tr
ades. Determine size and location of openings,
recesses, and chases from trades providing such items. Accurately place and
securely support items built into forms.


3.3

JOINT
S

AND WATERSTOPS


A.

CONSTRUCTION JOINTS


Locate and install construction joints where
indicated, or locate so as not
to impair strength and appearance of the stru
c
ture, as acceptable to the
Engineer
. Place construction joints perpendicular to main reinforcement.
Continue reinforcement across construction joints, except as

otherwise
shown
on the Plans
.


B.

SLAB (CONTROL) JOINT
S


Construct joints in slabs
-
o
n
-
grade as shown on the Plans
. Use saw cuts
1/8 of an inch wide x 1/4 of the slab depth or inserts 1/4
-
inch wide x 1/4 of
the slab depth.


C.

PREMOLDED (CONTROL)
JOINTS


Insert premolded plasti
c, hardboard or fiberboard strip into fresh concrete
until top surface of strip is flush with slab surface. Tool slab edges round
on each side of insert. After concrete has cured, remove inserts and clean
groove of loose debris.


3.4

INSTALLATION OF EMBE
DDED

ITEMS


A.

GENERAL


Set and build into work anchorage devices and other embedded items
required for other work that is attached to, or supported by, cast
-
in
-
place
concrete. Use installation drawings, diagrams, instructions, and directions
provided by supplie
rs of items to be embedded.


B.

CLEANING AND TIGHTEN
ING


Thoroughly clean forms and adjacent surfaces to receive concrete.
Remove chips, wood, sawdust, dirt, or other debris just before concrete is
placed. Retighten forms and bracing after concrete placemen
t as required
to eliminate mortar leaks and maintain proper alignment.




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C.

REGLETS


Install reglets to receive top edge of foundation sheet waterproofing, and
to receive thru
-
wall flashing as shown at lintels, relieving angles, and
other conditions.


3.5

PLACIN
G REINFORCEMENT


See Section 03200.


3.6

PREPARATION OF FORM
SURFACES


Clean reused forms of concrete matrix residue, repair and patch as required to
return forms to acceptable surface condition. Coat contact surfaces of forms with
a form
-
coating compound bef
ore reinforcement is placed.


Thin form coating compounds only with thinning agent of type, amount, and
under conditions of form
-
coating compound manufacturer’s directions. Do not
allow excess form
-
coating material to accumulate in forms or to come into c
ontact
with in
-
place concrete surfaces against which fresh concrete will be placed.
Apply in compliance with manufacturer’s instructions.


Coat steel forms with a non
-
staining, rust
-
preventative form oil or otherwise
protect against rusting. Rust
-
stained

steel formwork is not acceptable.


3.7

PREPARATION OF EXIST
ING CONCRETE SURFACE
S


The Contractor shall bush hammer all existing concrete surfaces that are to have
new concrete cast against them. Apply epoxy bonding agent prior to placing
concrete.


3.8

CONCRETE
PLACEMENT


A.

GENERAL


Comply with ACI 304 and as herein specified.


Before placing concrete, inspect and complete formwork installation,
reinforcing steel, and items to be embedded or cast
-
in. Notify other crafts
to permit installation of their work; cooper
ate with other trades in setting
such work. Apply temporary protective covering to lower 2 feet of
finished walls adjacent to poured floor slabs and similar conditions, and
guard against spattering during concrete placement.




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B.

PLACING CONCRETE IN
FORMS


Deposit concrete in forms in horizontal layers not deeper than 24

inches
and in a manner to avoid inclined construction joints. Where placement
consists of several layers, place each layer while preceding layer is still
plastic to avoid cold joints.


Cons
olidate placed concrete by mechanical vibrating equipment
supplemented by hand
-
spading, rodding, or tamping. Use equipment and
procedures for consolidation of concrete in accordance with ACI 309.


Do not use vibrators to transport concrete inside forms.
Insert and
withdraw vibrators vertically at uniformly spaced locations not farther
than visible effectiveness of machine. Place vibrators to rapidly penetrate
placed layer and at least 6 inches into preceding layer. Do not insert
vibrators into lower lay
ers of concrete that have begun to set. At each
insertion limit duration of vibration to time necessary to consolidate
concrete and complete embedment of reinforcement and other embedded
items without causing segregation of mix.


C.

COLD WEATHER PLACING


Protect concrete work from physical damage or reduced strength, which
could be caused by frost, freezing actions, or low temperatures, in
compliance with ACI 306 and as herein specified.


When air temperature has fallen to
or is expected to fall below
40

d
egrees

F (4

degrees C), uniformly heat water and aggregates before
mixing to obtain a concrete mixture
temperature of not less than
50

degrees F (10

degrees C), and not mor
e than 80 degrees F
(27

degrees

C) at point of placement.


Do not use frozen
materials or materials containing ice or snow. Do not
place concrete on frozen subgrade or on subgrade containing frozen
materials. Do not use calcium chloride, salt, and other materials
containing antifreeze agents or chemical accelerators, unless other
wise
accepted in mix designs.


D.

HOT WEATHER PLACING


When hot weather conditions exist that would seriously impair quality and
strength of concrete, place concrete in compliance with ACI 305 and as
herein specified.


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Cool ingredients before mixing to mainta
in concrete temperature at time
of placement below 90 degrees F (32 degrees C). Mixing water may be
chilled, or chopped ice may be used to control temperature provided water
equivalent of ice is calculated to total amount of mixing water. Use of
liquid n
itrogen to cool concrete is at Contractor’s option.


Cover reinforcing steel with water
-
soaked burlap if it becomes too hot, so
that steel temperature will not exceed the ambient air temperature
immediately before embedment in concrete. Fog spray forms, r
einforcing
steel, and subgrade just before concrete is placed. Upon approval, water
-
reducing retarding admixture (Type D) may be used when required by
high temperatures, low humidity, or other adverse placing conditions.


3.9

FINISH OF FORMED SUR
FACES


Provid
e smooth form finish for all formed concrete surfaces exposed
-
to
-
view
including all surfaces exposed to water or wastewater, or that are to be covered
with a coating material applied directly to the concrete, or a covering material
applied directly to conc
rete, such as veneer plaster, painting, or other similar type
of system.


Provide smooth form finish for surfaces to be waterproofed or dampproofed.
Surfaces must comply with recommendations of the manufacturer of the product
being utilized.


Provide ro
ugh form finish for formed concrete surfaces not exposed
-
to
-
view in
the finished work or by other construction, unless otherwise indicated.


A.

SMOOTH FORM FINISH


This is to be the as
-
cast concrete surface obtained utilizing selected form
facing material,
arranged orderly and symmetrically with a minimum of
seams, and as specified herein.


Repair and patch tie holes and defective areas, with all fins or other
projections completely removed and smoothed, by the following methods:


1.

Provide smooth rubbed finish to concrete surfaces after form
removal. Moisten concrete surfaces and rub with carborundum
brick or other abrasive until a uniform color and texture is
produced. Do not apply cement grout other than that created by
the rubbi
ng process.


2.

Provide grout “sacked” cleaned finish. The sacking grout shall be
one part Portland cement to 1
-
1/2 parts fine sand by volume, and
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mixed with water to consistency of thick paint. Proprietary
additives such as epoxy bonding agents or adhesive
s may be used
at Contractor’s option. Blend standard Portland cement and white
Portland cement, amounts to be determined by trial patches, so that
final color of dry grout matches adjacent surfaces. Thoroughly wet
concrete surfaces and apply grout to coa
t surfaces and fill small
holes. Remove excess grout by scraping and rubbing with clean
burlap. Keep sacked surfaces damp by fog spray or other
acceptable method so surfaces do not dry out.


B.

ROUGH FORM FINISH


This is the concrete surface having textur
e imparted by form facing
material used, with tie holes and defective areas repaired and patched and
fins and other projections exceeding 1/8 of an inch in height rubbed down
or chipped off. All “bug holes” exceeding 1/2

inc
h in diameter and
exceeding 1/4
-
inch depth shall be repaired or filled in.


C.

RELATED UNFORMED SUR
FACES


At tops of walls, horizontal offsets, and similar unformed surfaces
occurring at adjacent formed surfaces, continue final surface treatment of
formed surfaces uniformly across adjace
nt unformed surfaces, unless
otherwise indicated.


D.

TOLERANCES FOR FORME
D SURFACES


1.

Variations from the plumb:




a.


In the lines and surfaces
of columns, pier, walls
and in arises

In any 10 feet of length


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(
G&O #11047
)

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measured before
removal of supporting
shores

of an inch. Maximum for entire
length


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8.

Variations in steps:




a.

In a flight of stairs

Riser


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3.10

CONCRETE CURING AND
PROTECTION


A.

GENERAL


Protect freshly placed concrete from premature drying and excessive cold
or hot temperatures. Start initial curing as soon as free water has
disappeared from concrete surface after placing and finishing. Weather
permitting, keep concrete continuously wet

for not less than 7 days. Begin
final curing procedures immediately following initial curing and before
concrete has dried out. Continue final curing for at least 7 days in
accordance with ACI 301 curing methods. Avoid rapid drying of concrete
at the e
nd of final curing period.


B.

CURING METHODS


Perform curing of concrete by use of curing and sealing compound, by
moist curing, by moisture
-
retaining cover curing, or by combinations
thereof, as herein specified.


Provide moisture curing by the following me
thods. Keep concrete surface
continuously wet by covering with water, or provide continuous water
-
fog
spray.


Covering concrete surface with absorptive cover, thoroughly saturating
cover with water and keeping continuously thoroughly saturating cover
with

water and keeping continuously wet. Place absorptive cover to
provide coverage of conc
rete surfaces and edges, with 4
-
inch lap over
adjacent absorptive covers.


Provide moisture
-
cover curing as follows: Cover concrete surfaces with
moisture
-
retaining cov
er for curing concrete, placed in wide as practicable
width with sides and ends lapped at least 3 inches and sealed by
waterproof tape or adhesive. Immediately repair any holes or tears during
curing period using cover material and waterproof tape.


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Provi
de curing and sealing compound to exposed interior slabs and to
exterior slabs, walls, sidewalks, and curbs, as follows:


Apply curing and sealing compound to concrete slabs and walls as soon as
initial curing operations are complete or immediately after t
he forms have
been stripped (within 2 hours). Apply uniformly in continuous operation
by power
-
spray or roller in accordance with manufacturer’s directions.
Completely cover the concrete surfaces with curing and sealing
compound. Recoat areas subjected
to heavy rainfall within 3 hours after
initial application. Maintain continuity of coating and repair any damage
during curing period.


Do not use membrane curing compounds on surfaces which are to be
covered with coating material applied directly to conc
rete, liquid floor
hardener, waterproofing, dampproofing, membrane roofing, flooring (such
as ceramic or quarry tile, glue
-
down carpet), painting, and other coatings
and finish materials, unless
o
therwise acceptable to the Engineer
.


C.

CURING FORMED SURFAC
ES


Cure formed concrete surfaces, including undersides of beams, supported
slabs, and other similar surfaces by moist curing with forms in place for
full curing period and until forms are removed. When forms are removed,
continue curing by methods specifie
d above, as applicable.


D.

CURING UNFORMED SURF
ACES


Cure unformed surfaces, such as slabs, floor topping, and other flat
surfaces by application of an appropriate curing method.


Final cure concrete surfaces to receive liquid floor hardener or finish
floori
ng by use of moisture retaining cover.


3.11

SHORES AND SUPPORTS


A.

GENERAL


Comply with ACI 347 for shoring, and as herein specified. Extend
shoring from ground to roof for structures four stories or less, unless
otherwise permitted. Remove shores and reshore

in a planned sequence to
avoid damage to partially cured concrete. Locate and provide adequate
reshoring to safely support work without excessive stress or deflection.


Keep reshores in place a minimum of 15 days after placing upper tier, and
longer if r
equired, until all concrete has attained its required 28 day
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strength and heavy loads due to construction operations have been
removed.


B.

REMOVAL OF FORMS


Formwork not supporting weight of concrete, such as sides of beams,
walls, columns, and similar parts

of the work, may be removed after
cumulatively curing at not less than 50 degrees F (10 degrees C) for
24

hours after placing concrete, provided concrete is sufficiently hard to
not be damaged by form removal operations, and provided curing and
protection

operations are maintained.


Formwork supporting weight of concrete, such as beam soffits, joints,
suspended slabs, and other structural elements, may not be removed in less
than 14 days and until concrete has attained 70 percent of the design
minimum comp
ressive strength at 28 days. Determine potential
compressive strength of in
-
place concrete by testing field
-
cured
specimens
,

representative of concrete location or members.


Form facing material may be removed 4 days after placement, only if
shores and ot
her vertical supports have been arranged to permit removal of
form facing material without loosening or disturbing shores and supports.


3.12

REUSE OF FORMS


Clean and repair surfaces of forms to be reused in work. Split, frayed,
delaminated, or otherwise dama
ged form facing material will not be acceptable
for exposed surfaces. Provide new form facing material. Apply new form
coating compound as specifi
ed for new formwork prior to re
use of forms.


When forms are extended for successive concrete placement, tho
roughly clean
surfaces, remove fins and laitance, and tighten forms to close joints. Align and
secure joint to avoid offsets. Do not use “patched” forms fo
r exposed concrete
surfaces, unless approved by the Engineer

and acceptable to the Owner
.


3.13

MISCELLA
NEOUS CONCRETE ITEMS


A.

FILLING
-
IN


Fill
-
in holes and openings left in concrete structures for passage of work
by other trades, unless otherwise shown or directed, after work of other
trades is in place. Mix, place, and cure concrete as herein specified, to
blend with in
-
place construction.

Provide other miscellaneous concrete
filling shown or required to complete work. Fill
-
in all form tie holes and
other forming system holes with non
-
shrink grout.

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B.

CURBS


Provide monolithic finish to interior curbs by stripping forms while
concrete is sti
ll green and steel
-
troweling surfaces to a hard, dense finish
with corners, intersections, and terminations slightly rounded.


C.

BASE PLATE,
EQUIPMENT BASES AND
FOUNDATIONS


Provide machine and equipment bases

(housekeeping pad/pier)

and
foundations, as show
n on the
Plan
s. Set anchor bolts for machines and
equipment with template at correct elevations, complying with certified
diagrams or templates of manufacturers furnishing machines and
equipment.


Provide 4
-
inch
-
high, square or rectangular concrete pad around all
conduits and small diameter pipes that
penetrate through floor slabs.


Provide leveling grout under base plates and

equipment frames using

non
-
metallic, non
-
shrink grout. M
inimum thickness for leveling

gr
out
shall be
1/2 inches

unless noted otherwise on the Plans or specified by equipment
manufacturer.



3.14

CONCRETE SURFACE REP
AIRS


A.

PATCHING DEFECTIVE A
REAS


Repair and patch defective areas immediately after removal of forms. Cut
out honeycomb, rock pockets,

voids or bugholes over 1/4

inch in any
dimension, and holes left by tie rods and bolts, down to solid concrete but,
in no case to a depth of less than 1 inch. Make edges of cuts perpendicular
to the concrete surface. Thoroughly clean, dampen with water,

and brush
-
coat the area to be patched with specified bonding agent. For water and
wastewater containment structures, utilize an epoxy resin bonding agent.
Place patching mortar after bonding compound has dried.


For exposed
-
to
-
view surfaces, blend white

Portland cement and standard
Portland cement so that, when dry, patching mortar will match
surrounding color. Provide test areas at inconspicuous location to verify
mixture and color match before proceeding with patching. Compact
mortar in place and str
ike
-
off slightly higher than surrounding surface.




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B.

REPAIR OF FORMED SUR
FACES


Remove and replace concrete having defective surfaces if defects cannot
be repa
i
red to satisfaction of the Engineer
. Surface defects, as such,
include color and texture
irregularities, cracks, spalls, air bubbles, bug
holes, honeycomb, rock pockets; fins and other discolorations that cannot
be removed by cleaning. Flush out form tie holes and form bolt holes, fill
with non
-
shrink grout, or precast concrete cone plugs or
rubber plugs
secured in place with bonding agent or epoxy adhesive.


Repair concealed formed surfaces, where possible, that contain defects
that affect the durability of concrete.
All repairs shall be approved by the
Engineer.

If defects cannot be repaired
,

the Contractor shall
remove and
replace the concrete
.


C.

REPAIR OF UNFORMED S
URFACES


Test unformed surfaces, such as monolithic slabs, for smoothness and
verify surface plane to tolerances specified for each surface and finish.
Correct low and high areas

as herein specified. Test unformed surfaces
sloped to drain for trueness of slope, in addition to smoothness using a
template having required slope.


Repair finished unformed surfaces that contain defects, which affect
durability of concrete. Surface de
fects, as such, include crazing, cracks in
excess of 0.01

inches wide or which penetrate to reinforcement or
completely through non
-
reinforced sections regardless of width, spalling,
pop
-
outs, honeycomb, rock pockets, and other objectionable conditions.


C
orrect high areas in unformed surfaces by grinding, after concrete has
cured at least 14 days. Correct low areas in unformed surfaces during or
immediately after completion of surface finishing operations by cutting
out low areas and replacing with fresh
concrete. Finish repaired areas to
blend into adjacent concrete. Proprietary patching compounds may be
u
sed when acceptable to the En
gineer
.


Repair defective areas, except random cracks a
nd single holes not
exceeding 1
-
inch diameter, by cutting out and
replacing with fresh
concrete. Remove defective areas to sound concrete with clean, square
cuts and expose reinforcing steel with at least 3 inches of clearance all
around. Dampen concrete surfaces in contact with patching concrete and
apply bonding agen
t. Mix patching concrete of same materials to provide
concrete of same type or class as original concrete. Place, compact, and
finish to blend with adjacent finished concrete. Cure in same manner as
adjacent concrete.

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Repair isolated random cracks and
single holes not over 1 inch in diameter
by dry
-
pack method. Groove top of cracks and cutout holes to sound
concrete and clean off dust, dirt, and loose particles. Dampen cleaned
concrete surfaces and apply bonding agent. Mix dry
-
pack, consisting of
one

part Portland cement to
2
-
1/2
parts fine aggregate passing a No. 16
mesh sieve, using only enough water as required for handling and placing.
Place dry pack after bonding agent has dried. Compact dry
-
pack mixture
in place and finish to match adjacent co
ncrete. Keep patched area
continuously moist for not less than 72 hours.


Perform structural repairs

with prior approval of the Engineer

for method
and procedure, using specified epoxy adhesive and mortar. Repair
methods not specified above may be used,
s
ubject to approval of the
Engineer
.

If acceptable repairs cannot be made, the Contractor shall
remove and replace the concrete at no cost to the Owner.


3.15

QUALITY CONTROL TEST
ING DURING CONSTRUCT
ION


A.

GENERAL


Sampling and testing for quality control during
placement of concrete
shall include the following:


1.

Sampling Fresh Concrete


ASTM C172, except modified for slump to comply with
ASTM

C94.


2.

Slump


ASTM C143: one test at point of discharge for each day’s
placement of each type of concrete; additional tests

when concrete
consistency seems to have changed.


3.

Air Content


ASTM C173, volumetric method for lightweight or normal weight
concrete; ASTM C231 pressure method for normal weight
concrete; one for each day’s placement of each type of air
-
entrained concret
e.




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4.

Concrete Temperature


Test hourly when air temperature is 40 degrees F (4 degrees C) and
below, and when 80 degrees F (27 degrees C) and above; and each
time a set of compression test specimens is made.



5.

Compression Test Specimen


ASTM C31; one set o
f four standard cylinders for each
compressive strength test, unless otherwise directed. Mold and
store cylinders for laboratory cured test specimens except when
field
-
cure test specimens are required.


6.

Compressive Strength Tests


ASTM C39; one set for ea
ch day’s placement exceeding 5 cubic
yards plus additional sets for each 50 cubic yards over and above
the first 25 cubic yards of each concrete class placed in any
1

day;
one specimen tested at 7 days, two specimens tested at 28 days,
and one specimen ret
ained in reserve for later testing if required.


When total quantity of a given class of concrete is le
ss than
50

cubic yards, Engineer

may waive strength test if, in his
judgment, adequate evidence of satisfactory strength is provided.


When strength of f
ield
-
cured cylinders is less than 85 percent of
companion laboratory
-
cured cylinders, evaluate current operations
and provide corrective procedures for protecting and curing the in
-
place concrete. Strength level of concrete will be considered
satisfactory

if averages of sets of three consecutive strength test
results equal or exceed specified compressive strength, and no
individual strength test result falls below specified compressive
strength by more than 500 psi.


Test results w
ill

be reported in writin
g to Engineer

and Contractor
within 24 hours after testing. FAX of test results is acceptable;
however, mailing hard copies of test results is also required.
Reports of compressive strength tests shall contain the project
identification name and number,
date of concrete placement, name
of concrete testing service, concrete type and class, location of
concrete batch in structure, design compressive strength at 28 days,
concrete mix proportions and materials; compressive breaking
strength and type of break
for both 7 day tests and 28
-
day tests.



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7.

Nondestructive Testing


Impact hammer, sonoscope, or other nondestructive device may be
permitted but shall not be used as the sole basis for acceptance or
rejection of concrete.


8.

Additional Tests


The testing service will make additional tests of in
-
place concrete
when test results indicate specified concrete strengths and other
characteristics have not been attained in a structure, as directed by
the
Owner
. Testing service may conduct tests to det
ermine
adequacy of concrete by cored cylinders complying with
ASTM

C42, or by other methods as directed. Contractor shall pay
for cost of such tests when unacceptable concrete is verified.


3.16

WATERTIGHTNESS


All water and wastewater holding tanks, basins an
d structures listed on the
Structural
Plan
s shall be tested for watertightness. Each tank, structure or basin
shall be tested independently.


Watertightness tests shall be made after the concrete has obtained at least 90
percent of its required 28
-
day c
ompressive strength, but in no case sooner than 20
days after placement. Watertightness shall conform to the requirements of
ACI

350.1.


Leakage testing shall not be conducted during periods of time with measurable
precipitation. Evaporation correction s
hall be made on the basis of an evaporation
pan. Suitable evaporation pan shall be approved by
Owner

and shall be provided
by Contractor.


Watertightness testing may follow backfill of the structure, at the Contractor’s
option. However, if the structur
e does not pass the test, re
-
excavation to locate
leaks shall be required. All costs associated with location (re
-
excavation and
backfilling) and repair of leaks shall be borne by the Contractor.



*** END OF SECTION ***