CAST-IN-PLACE CONCRETE

Tribal code

Ask Donna

What actually matters in this document.

Text

SECTION 033000

CAST-IN-PLACE CONCRETE

PART 1

1.1

GENERAL

DESCRIPTION

1.2

This section specifies Cast-in-place concrete, including formwork, reinforcement, concrete

materials, mixture design, placement procedures, and finishes.

SUBMITTALS

A. Refer to the Special Provisions and section 013300 for additional submittal guidelines.

Before any equipment and/or material is fabricated or shipped, furnish to the Engineer full

details, shop drawings, dimensions, catalog cuts, schematic (elementary) diagrams, and

other descriptive matter as required to fully describe the equipment and/or material

specified under the Section.

Product Data: for each type of product indicated.

Design Mixtures: for each concrete mixture.

Shop Drawings: For steel reinforcement.

Material test reports.

1.3

QUALITY ASSURANCE

Single-Source Responsibility: Obtain major materials, products, equipment, and system

components, from one source from a single manufacturer.

Manufacturer Qualifications: a firm experienced in manufacturing ready-mixed concrete

products and that complies with ASTM C94/C94M requirements for production facilities

and equipment.

ACI Publications: comply with the following unless modified by requirements in the

Contract Documents:

Manufacturer certified according to NRMCA’s “Certification of Ready Mixed

Concrete Production Facilities”.

ACI 301: “Specification for Structural Concrete,” Sections 1 through 5.

ACI 117: “Specifications for Tolerances for Concrete Construction and materials”.

Pre-installation conference: conduct a conference at the project site.

TVCE

Cast-In-Place Concrete

033000-1

1.5

CODES, ORDINANCES, AND REGULATIONS

A. Do all work and install materials and/or equipment in accordance with the requirements of

the applicable Federal, State, County, City, and applicable laws and ordinances having

jurisdiction.

1.4

MEASUREMENT

A. Measurement and payment are per bid schedule Section 004100.

1.5

RELATED SECTIONS

1.6

Divisions 31, 32, and 33.

REFERENCES

A. ACI 304: Recommended Practice for Measuring, Mixing, Transporting and Placing

Concrete.

B. ASTM C94: Ready-Mixed Concrete.

PART 2

2.1

PRODUCTS

GENERAL

A. Unless otherwise indicated, provide all first-quality new materials, free from any defects,

and suitable for the intended use and the space provided. Provide materials approved by

UL wherever standards have been established by that organization.

B. Furnish and install all incidental items not specifically shown or specified which are

required by good practice to provide the complete systems specified herein.

C. Where two or more units of the same class of material or equipment are required, provide

products of a single manufacturer. Component parts of materials or equipment need not

be products of the same manufacturer.

2.2

FORM-FACING MATERIALS

A. Smooth-formed finished concrete: form-facing panels that will provide continuous, true,

and smooth concrete surfaces. Furnish in largest practicable sizes to minimize the number

of joints.

B. Rough-formed finished concrete: plywood, lumber, metal, or other approved materials.

Provide lumber dressed on at least two edges and one side for tight fit.

2.3

STEEL REINFORCEMENT

TVCE

Cast-In-Place Concrete

033000-2

A. Reinforcing Bars: ASTM A 615/A 615M. Grade 60 (grade 420), deformed.

B. Galvanized-steel welded wire reinforcement: ASTM A 185, plain, fabricated from

galvanized steel wire into flat sheets.

C. Bar supports: bolsters, chairs, spacers, and other devices for spacing, supporting, and

fastening reinforcing bars and welded wire reinforcement in place. Manufacture bar

supports from steel wire, plastic, or pre-cast concrete according to CRSI’s “Manual of

Standard Practice”.

2.4

CONCRETE MATERIALS

A. Cementitious Material: use the following cementitious materials, of the same type, brand,

and source, throughout the project:

Portland Cement: ASTM C150, Type III

B. Normal-weight aggregates: ASTM C33, graded, ¾ inch (19 mm) nominal maximum

coarse-aggregate size.

Fine and Coarse Aggregates: free of materials with deleterious reactivity to alkali

in cement.

C. Water: Clean (not detrimental to concrete). ASTM C94/C94M and potable.

2.5

ADMIXTURES

A. Air Entrainment: ASTM C260.

B. Chemical Admixtures: provide admixtures certified by manufacturer to be compatible with

other admixtures and that will not contribute water-soluble chloride ions exceeding those

permitted in hardened concrete. Do not use calcium chloride or admixtures containing

calcium chloride.

2.6

Water reducing admixture: ASTM C494C494M, Type A.

Retarding admixture: ASTM C494/C494M, Type B.

Water reducing and retarding admixture: ASTM C494/C494M, Type D.

High range, water reducing admixture: ASTM C494/C494M, Type F.

High range, water reducing and retarding admixture: ASTM C494/C494M, Type

Plasticizing and retarding admixture: ASTM C1017/C1017M, Type II.

VAPOR RETARDERS

A. Plastic vapor retarder: ASTM E 1745, Class C, or polyethylene sheet, ASTM D 4397 not

TVCE

Cast-In-Place Concrete

033000-3

less than 6 mil thick. Include manufacturer’s recommended adhesive or pressure-sensitive

joint tape.

B. Joint seams to overlap a minimum of twelve inches and be secured in place with

manufacturer recommended and Owner approved joint tape.

2.7

CURING MATERIALS

A. Evaporation retarder: waterborne, monomolecular film forming, manufactured for

application to fresh concrete.

B. Absorptive cover: AASHTO M 182, Class 2, burlap cloth made from jute or kenaf,

weighing approximately 9 oz/sq. yd. (305 g/sq. m) when dry.

C. Moisture-retaining cover: ASTM C 171, polyethylene film or white burlap-polyethylene

sheet.

D. Water: potable.

E. Clear, waterborne, membrane-forming curing compound: ASTM C 309, Type 1, Class B,

non-dissipating, certified by curing compound manufacturer to not interfere with bonding

of floor covering.

F. Clear, waterborne, membrane-forming curing compound: ASTM C 309, Type 1, Class B,

non-dissipating, certified by curing compound manufacturer to not interfere with bonding

of floor covering.

G. Clear, solvent-borne, membrane-forming curing and sealing compound: ASTM C 1315,

Type 1, Class A.

H. Clear, waterborne, membrane-forming curing and sealing compound: ASTM C 1315, Type

1, Class A.

2.8

RELATED MATERIALS

A. Expansion and isolation joint filler strips: ASTM D 1751, asphalt-saturated cellulosic fiber

or ASTM D 1752, cork or self-expanding cork.

2.9

CONCRETE MIXTURES

A. Prepare design mixtures for each type and strength of concrete, proportioned on the basis

of laboratory trial mixture or field test data, or both, according to ACI 301.

B. Provide concrete to the following criteria:

TVCE

Minimum compressive strength: 2500 psi at 28 days.

Cast-In-Place Concrete

033000-4

2.10

Maximum water-cementitious materials ratio: 0.45.

Slump limit: 4 inches (100 mm) for concrete with verified slump of 2 to 4 inches

(50 to 100 mm) before adding high-range water-reducing admixture or plasticizing

admixture, plus or minus 1 inch (25 mm).

Air content: 6 percent, plus or minus 1.5 percent at point of delivery for ¾ inch (19

mm) nominal maximum aggregate size.

CONCRETE MIXING

A. Ready mix concrete: measure, batch, mix, and deliver concrete according to ASTM

C94/C94M, and furnish batch ticket information.

2.11

When air temperature is between 85- and 90-degrees F (30 and 32 deg C), reduce

mixing and delivery time from 1-1/2 hours to 75 minutes; when air temperature is

above 90 deg F (32 deg C), reduce mixing and delivery time to 60 minutes.

FABRICATING REINFORCEMENT

A. Fabricate steel reinforcement according to CRSI’s “manual of Standard Practice”.

PART 3

3.1

EXECUTION

FORMWORK

A. Design, erect, shore, brace, and maintain formwork according to ACI 301 to support

vertical, lateral, static, and dynamic loads, and construction loads that might be applied,

until structure can support such loads.

B. Construct formwork so concrete members and structures are of size, shape, alignment,

elevation, and position indicated, within tolerance limits of ACI 117.

3.2

EMBEDDED ITEMS

A. Place and secure anchorage devices and other embedded items required for adjoining work

that is attached to or supported by cast-in-place concrete. Use setting drawings, templates,

diagrams, instructions, and directions furnished with items to be embedded.

3.3

VAPOR RETARDERS

A. Plastic vapor retarders: place, protect, and repair vapor retarders according to ASTM E

1643 and manufacturer’s written instructions.

TVCE

Lab joints twelve inches minimum and seal with manufacturer’s recommended

tape.

Do not cut or puncture vapor retarder. Repair damage and reseal vapor retarder

before placing concrete.

Cast-In-Place Concrete

033000-5

3.4

STEEL REINFORCEMENT

A. General: comply with CRSI’s “Manual of Standard Practice” for placing reinforcement.

3.5

JOINTS

A. General: construct joints true to line with faces perpendicular to surface plane of concrete.

B. Construction joints: install so strength and appearance of concrete are not impaired, at

locations indicated or as approved by the Engineer.

C. 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 concrete thickness as follows:

Grooved joints: form contraction joints after initial floating by grooving and

finishing each edge of joint to a radius of 1/8 inch (3.2 mm). Repeat grooving of

contraction joints after applying surface finishes. Eliminate groover tool marks on

concrete surfaces.

Sawed joints: form contraction joints with power saws equipped with shatterproof

abrasive or diamond-rimmed blades. Cut 1/8 inch (3.2 mm) wide joints into

concrete when cutting action will not tear, abrade, or otherwise damage surface and

before concrete develops random contraction cracks.

D. Isolation joints in slabs-on-grade: after removing formwork, install joint-filler strips at slab

junctions with vertical surfaces, such as column pedestals, foundation walls, grade beams,

and other locations, as indicated.

3.6

EXAMINATION

A. Verify that anchors, seats, plates, reinforcement and other items to be cast into concrete are

accurately placed and positioned securely and will not cause hardship in placing concrete.

3.7

PREPARATION

A. Thoroughly compact concrete bearing area to a minimum depth of 6 inches. Compaction

shall be a minimum of ninety-five percent (95%) relative compaction beneath all

foundations.

3.7

CONCRETE PLACEMENT

A. Before placing concrete, verify that installation of formwork, reinforcement, and embedded

items is complete and that required inspections have been performed.

B. Deposit concrete continuously in one layer or in horizontal layers of such thickness that no

TVCE

Cast-In-Place Concrete

033000-6

new concrete will be placed on concrete that has hardened enough to cause seams or planes

of weakness. If a section cannot be placed continuously, provide construction joints as

indicated. Deposit concrete to avoid segregation.

Consolidate placed concrete with mechanical vibrating equipment according to

ACI 301.

C. Cold-weather placement: comply with ACI 306.1.

D. Hot-weather placement: comply with ACI 301.

3.8

FINISHING FORMED SURFACES

A. Rough-formed finish: as cast concrete texture imparted by form-facing material with tie

holes and defects repaired and patched. Remove fins and other projections that exceed

specified limits on formed-surface irregularities.

Apply to concrete surfaces.

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 defects. Remove fins and other projections that exceed specified limits on formedsurface irregularities.

Apply to concrete surfaces exposed to public view.

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.

3.9

FINISHING FLOORS AND SLABS

A. General: comply with ACI 302.1R recommendations for screeding, re-straightening, and

finishing operations for concrete surfaces. Do not wet concrete surfaces.

B. Float finish: consolidate surface with power-driven floats or by hand floating if area is

small or inaccessible to power driven floats. Rte-straighten, cut down high spots, and fill

low spots. Repeat float passes and re-straightening until surface is left with a uniform,

smooth, granular texture.

TVCE

Apply a trowel finish to surfaces indicated.

Finish and measure surface so gap at any point between concrete surface and an

unleveled, freestanding, 10 foot (3.05 m) long straightedge resting on 2 high spots

and placed anywhere on the surface does not exceed ¼ inch (6 mm).

Cast-In-Place Concrete

033000-7

C. Trowel finish: after applying float finish, apply first troweling and consolidate concrete by

hand or power-driven trowel. Continue troweling passes and re-straighten until surface is

free of trowel marks and uniform in texture and appearance. Grind smooth any surface

defects that would telegraph through applied coatings or floor coverings.

D. Trowel and fine-broom finish: apply a first trowel finish to surfaces indicated. While

concrete is still plastic, slightly scarify surface with a fine broom.

Comply with flatness and levelness tolerances for trowel finished floor surfaces.

E. Broom finish: apply a broom finish to exterior concrete platforms, steps, and ramps, and

elsewhere as indicated.

3.10

CONCRETE PROTECTING 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 ACI 301 for hotweather protection during curing.

B. Evaporation retarder: apply evaporation retarder to unformed concrete surfaces if hot, dry,

or windy conditions cause moisture loss approaching 0.2 lb/sq. ft. x h (1 kg/sq. m x h)

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. Cure concrete according to ACI 308.1, by one or a combination of the following methods:

3.11

Moisture curing: keep surfaces continuously moist for not less than seven days.

Moisture-retaining-cover curing: cover concrete surfaces with moisture-retaining

cover for curing concrete, placed in widest practicable width, with sides and ends

lapped at least 12 inches (300 mm), and sealed by waterproof tape or adhesive. Cure

for not less than seven days. Immediately repair any holes or tears during curing

period using cover material and waterproof tape.

Curing compound: apply uniformly in continuous operation by power spray or

heavy rainfall within three hours after initial application maintain continuity of

coating and repair damage during curing period.

After curing period has elapsed, remove curing compound without

damaging concrete surfaces by method recommended by curing compound

manufacturer.

Curing and sealing compound: apply uniformly to floors and slabs indicated in a

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. Repeat process 24 hours later and apply a second coat. Maintain

continuity of coating and repair damage during curing period.

FIELD QUALITY CONTROL

TVCE

Cast-In-Place Concrete

033000-8

A. Testing and inspection: Owner will engage a qualified independent testing and inspecting

agency to perform field tests and inspections and prepare test reports.

PART 4

4.1

Testing services: tests shall be performed according to ACI 301.

MEASUREMENT AND PAYMENT

A. Measurement and payment for all work shall be in accordance with the contract BID

SCHEDULE, refer to Section 004100 and actual work as field measured and verified. No

payments will be made for materials on hand. All payments to be made following field

verification of work.

END OF SECTION 033000

TVCE

Cast-In-Place Concrete

033000-9

This is a copy of a public record, reproduced as it was published. It is not legal advice, and it may not be the version a court would rely on. Check the official source before you cite it.