CF-Justice Center Fence-SP090701SECTION 03300 -CAST-IN-PLACE CONCRETE
PART 1 -GENERAL
1.1 SUMMARY
A. This Section includes cast-in-place concrete, including reinforcement, concrete materials, mix
design, placement procedures, and finishes.
B. See Section 02301 "Earthwork for General Grading" for subgrade preparation beneath slabs-
on-grade.
1.2 SUBMITTALS
A. Product Data: For each manufactured material and product indicated.
B. Design Mixes: For each concrete mix indicated.
C. Shop Drawings: Include details of steel reinforcement placement including material, grade, bar
schedules, stirrup spacing, bent bar diagrams, arrangement, and supports.
D. Material certificates.
1.3 QUALITY ASSURANCE
A. Manufacturer Quaycations: A firm experienced in manufacturing ready-mixed concrete ,
products complying with ASTM C 94 requirements for production facilities and equipment.
B. Comply with ACI 301, "Specification for Structural Concrete," including the following, unless
modified by the requirements of the Contract Documents.
1. General requirements, including submittals, quality assurance, acceptance of structure,
and protection of in-place concrete.
2. Formwork and form accessories.
3. Steel reinforcement and supports.
4. Concrete mixtures.
5. Handling, placing, and constructing concrete.
PART 2 -PRODUCTS
2.1 MATERIALS
A. Formwork: Furnish formwork and form accessories according to ACI 301.
B. Steel Reinforcement:
1. Reinforcing Bars: ASTM A 615/A 615M, Grade 60, deformed.
2. Plain-Steel Welded Wire Fabric: ASTM A 185, fabricated from as-drawn steel wire into
flat sheets.
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C. Concrete Materials:
1. Portland Cement: ASTM C 150, Type I.
2. Normal-Weight Aggregate: ASTM C 33, uniformly graded, not exceeding 1-1/2-inch
nominal size, typical.
3. Water: Complying with ASTM C 94.
D. Admixtures:
1. Air-Entraining Admixture: ASTM C 260.
2. Water-Reducing Admixture: ASTM C 494, Type A.
3. High-Range, Water-Reducing Admixture: ASTM C 494, Type F.
4. Water-Reducing and Accelerating Admixture: ASTM C 494, Type E.
5. Water-Reducing and Retarding Admixture: ASTM C 494, Type D.
6. Flyash is not allowed in concrete.
E. Joint-Filler Strips: ASTM D 1752, cork or self-expanding cork.
F. Curing Materials:
1. Evaporation Retarder: Waterborne, monomolecular film forming, manufactured for
application to fresh concrete.
2. Absorptive Cover: AASHTO M 182, Class 2, burlap cloth made from jute or kenaf.
3. Moisture-Retaining Cover: ASTM C 171, polyethylene film or white burlap-polyethylene
sheet.
4. Water: Potable.
5. Clear, Waterborne, Membrane-Forming Curing Compound: ASTM C 309, Type 1,
Class B.
6. Clear, Waterborne, Membrane-Forming Curing and Sealing Compound: ASTM C 1315,
Type 1, Class A.
2.2 CONCRETE MIXES
A. Comply with ACI 301 requirements for concrete mixtures.
B. Prepare design mixes, proportioned according to AC1301, for normal-weight concrete
determined by either laboratory trial mix or field test data bases, as follows:
Compressive Strength (28 Days): 4000 psi, typical; 3000 psi, piers and slabs on grade.
Slump: 4 inches, typical; 3 inches, ramps and sloping surfaces.
Slump Limit for Concrete Containing High-Range Water-Reducing Admixture: Not
mere than 8 inches after adding admixture to plant- or site-verified, 2- to 3-inch
slump.
C. Add air-entraining admixture at manufacturer's prescribed rate to result in concrete at point of
placement having an air content of 3 to 5 percent, typical .
Air content of trowel-finished interior concrete floors shall not exceed 3.0 percent.
2.3 CONCRETE MIXING
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A. Ready-Mixed Concrete: Comply with ASTM C 94.
When air temperature is between 85 and 90 deg F, reduce mixing and delivery time from
1-1/2 hours to 75 minutes; when air temperature is above 90 deg F, reduce mixing and
delivery time to 60 minutes.
B. Project-Site Mixing: Measure, batch, and mix concrete materials and concrete according to
ASTM C 94. Mix concrete materials in appropriate drum-type batch machine mixer.
For mixer capacity of 1 cu. yd. or smaller, continue mixing at least 1-1/2 minutes, but not
more than 5 minutes after ingredients are in mixer, before any part of batch is released.
For mixer capacity larger than 1 cu. yd., increase mixing time by 15 seconds for each
additional 1 cu. yd..
C. Provide batch ticket for each batch discharged and used in the Work, indicating Project
ident~cation name and number, date, mix type, mix time, quantity, and amount of water added.
Record approximate location of final deposit in structure.
PART 3 -EXECUTION
3.1 INSI~ALLATION, GENERAL
A. Formwork: Design, construct, erect, shore, brace, and maintain formwork according to
ACI 301.Delete subparagraph below if fine-graded granular material is not required over vapor
retarder.
B. Steel Reinforcement: Comply with CRSI's "Manual of Standard Practice" for fabricating,
placing, and supporting reinforcement.
Do not cut or puncture vapor retarder. Repair damage and reseal vapor retarder before
placing concrete.
C. Joints: Construct joints true to line with faces perpendicular to surface plane of concrete.
1. Construction Joints: Locate and install so as not to impair strength or appearance of
concrete, at locations indicated or as approved by Architect.
2. Isolation Joints: Install joint-filler strips at junctions with slabs-on-grade and vertical
surfaces, such as column pedestals, foundation walls, grade beams, and other locations,
as indicated.
a. Extend joint fillers full width and depth of joint, terminating flush with finished
concrete surface, unless otherwise indicated.
3. Contraction Joints in Slabs-on-Grade: Form weakened-plane contraction joints,
sectioning concrete into areas as indicated. Construct contraction joints for a depth equal
to at least one-fourth of the concrete thickness, as follows:
a. Sawed Joints: Form contraction joints with power saws equipped with shatterproof
abrasive or diamond-rimmed blades. Cut 1/8-inch- wide joints into concrete when
cutting action will not tear, abrade, or otherwise damage surface and before
concrete develops random contraction cracks.
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D. Tolerances: Comply with ACI 117, "Specifications for Tolerances for Concrete Construction
and Materials."
32 CONCRETE PLACEMENT
A. Comply with recommendations in ACI 304R for measuring, mixing, transporting, and placing
concrete.
B. Do not add water to concrete during delivery, at Project site, or during placement.
C. Consolidate concrete with mechanical vibrating equipment.
3.3 FINISHING FORMED SURFACES
A. Rough-Formed Finish: As-cast concrete texture imparted by form-facing material with tie holes
and defective areas repaired and patched, and fins and other projections exceeding 1/4 inch in
height rubbed down or chipped off.
1. Apply to concrete surfaces not exposed to public view.
B. Smooth-Formed Finish: As-cast concrete texture imparted by form-facing material, arranged in
an orderly and symmetrical manner with a minimum of seams. Repair and patch tie holes and
defective areas. Completely remove fins and other projections.
1. Apply to concrete surfaces exposed to public view or to be covered with a coating or
covering material applied directly to concrete, such as waterproofing, dampproofing,
veneer plaster, or painting.
2. Do not apply rubbed finish to smooth-formed finish.
C. Related Unformed Surfaces: At tops of walls, horizontal offsets, and similar unformed surfaces
adjacent to formed surfaces, strike off smooth and finish with a texture matching adjacent
formed surfaces. Continue final surface treatment of formed surfaces uniformly across adjacent
unformed surfaces, unless otherwise indicated.
3.4 FINISHING UNFORMED SURFACES
A. General: Comply with ACI 302.1 R for screeding, restraightening, and finishing operations for
concrete surfaces. Do not wet concrete surfaces.
B. Screed surfaces with a straightedge and strike off. Begin initial floating using bull floats or
darbies to form a unifor~~~ ar~d open-textured surface plane before excess moisture or
bleedwater appears on the surface.
1. Do not further disturb surfaces before starting finishing operations.
C. Scratch Finish: Apply scratch finish to surfaces to receive concrete floor topping or mortar
setting beds for ceramic or quarry tile, Portland cement terrazzo, and other bonded cementitious
floor finish, unless otherwise indicated.
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D. Float Finish: Apply float finish to surfaces indicated, to surfaces to receive trowel finish, and to
floor and slab surfaces to be covered with fluid-applied or sheet waterproofing, built-up or
membrane roofing, or sand-bed terrazzo.
E. Trowel Finish: Apply a hard trowel finish to surfaces indicated and to floor and slab surfaces
exposed to view or to be covered with resilient flooring, carpet, ceramic or quarry the set over a
cleavage membrane, paint, or another thin film-finish coating system.
Finish surfaces to the following tolerances, measured within 24 hours according to ASTM
E 1155lE 1155M for a randomly trafficked floor surface:
a. Specified overall values of flatness, F(F) 35; and levelness, F(L) 25; with minimum
local values of flatness, F(F) 24; and levelness, F(L) 17; for slabs-on-grade.
b. Specified overall value of flatness, F(F) 25; with minimum local value of flatness,
F(F} 17; for suspended slabs.
3.5 CONCRETE PROTECTION AND CURING
A. General: Protect freshly placed concrete from premature drying and excessive cold or hot
temperatures. Comply with ACI 306.1 for cold-weather protection, and follow recommendations
in ACI 305R for hot-weather protection during curing.
B. Evaporation Retarder: Apply evaporation retarder to concrete surfaces if hot, dry, or windy
conditions occur before and during finishing operations. Apply according to manufacturer's
written instructions after placing, screeding, and bull floating or darbying concrete, but before
float finishing.
C. Begin curing after finishing concrete, but not before free water has disappeared from concrete
surface.
D. Cure formed and unformed concrete for at least seven days as follows:
Curing and Seating Compound: Apply uniformly in continuous operation by power spray
or roller according to manufacturer's written instructions. Recoat areas subjected to
heavy rainfall within three hours after initial application. Maintain continuity of coating
and repair damage during curing period
3.6 FIELD QUALITY CONTROL
A. Testing Agency: Owner will engage a qualified independent testing and inspecting agency to
sample materials, perform tests, and submit test reports during concrete placement. Tests will
be performed according to ACI 301.
1. Testing Frequency: One composite sample for each day's pour of each concrete mix
exceeding 5 cu. yd., but less than 25 cu. yd., plus one set for each additional 50 cu. yd.
or fraction thereof.
2. Testing Frequency: At least one composite sample for each 100 cu. yd. or fraction
thereof of each concrete mix placed each day.
END OF SECTION 05120
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