Orrs mills SPEC-321313-ConcretePaving-MASTER (1).docx

SECTION 321313

CONCRETE PAVING

Van Hoose, Stephen E (OPWDD) CONCRETE PAVING

GENERAL

SECTION INCLUDES

Sidewalks.

Curbs and Gutters.

SUBMITTALS

Design Mixture: For each concrete paving mixture. Include alternate design mixtures when characteristics of materials, Project conditions, weather, test results, or other circumstances warrant adjustments.

QUALITY ASSURANCE

Ready-Mix-Concrete Manufacturer Qualifications: A firm experienced in manufacturing ready-mixed concrete products and that complies with ASTM C 94/C 94M requirements for production facilities and equipment.

Concrete batching plants shall be currently approved as concrete suppliers by the New York State Department of Transportation.

ACI Publications: Comply with ACI 301 (ACI 301M) unless otherwise indicated.

PRODUCTS

STEEL REINFORCEMENT

Plain-Steel Welded Wire Reinforcement: ASTM A 185/A 185M, fabricated from as-drawn steel wire into flat sheets.

Deformed-Steel Welded Wire Reinforcement: ASTM A 497/A 497M, flat sheet.

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

Plain-Steel Wire: ASTM A 82/A 82M, as drawn.

Deformed-Steel Wire: ASTM A 496/A 496M.

Dowel Bars: ASTM A 615/A 615M, Grade 60 (Grade 420) plain-steel bars. Cut bars true to length with ends square and free of burrs.

Bar Supports: Bolsters, chairs, spacers, and other devices for spacing, supporting, and fastening reinforcing bars, welded wire reinforcement, and dowels in place. Manufacture bar supports according to CRSI's "Manual of Standard Practice" from steel wire, plastic, or precast concrete of greater compressive strength than concrete specified.

CONCRETE MATERIALS

Cementitious Material: Use the following cementitious materials, of same type, brand, and source throughout Project:

Portland Cement: ASTM C 150, gray portland cement Type I/II. Supplement with the following:

Fly Ash: ASTM C 618, Class F, as a replacement for 15 percent (by weight) of the Portland cement.

Ground Granulated Blast-Furnace Slag: ASTM C 989, Grade 100 or 120, as a replacement for at least 20 percent (by weight) of the Portland cement.

Normal-Weight Aggregates: ASTM C 33, uniformly graded. Provide aggregates from a single source.

Water: Potable and complying with ASTM C 94/C 94M.

Air-Entraining Admixture: ASTM C 260, and on the New York State Department of Transportation’s current “Approved List”.

Water-Reducing Admixture: ASTM C 494 / C 494M-04 Type A and on the New York State Department of Transportation’s current “Approved List”.

High Range Water-reducing Admixture: ASTM C 494 / C 494M-04 Type F and on the New York State Department of Transportation’s current “Approved List”.

Chemical Admixtures: Admixtures certified by manufacturer to be compatible with other admixtures and to contain not more than 0.1 percent water-soluble chloride ions by mass of cementitious material.

CURING MATERIALS

Absorptive Cover: AASHTO M 182, Class 3, burlap cloth made from jute or kenaf, weighing approximately 9 oz./sq. yd. (305 g/sq. m) dry.

Moisture-Retaining Cover: ASTM C 171, polyethylene film or white burlap-polyethylene sheet.

Water: Potable.

Evaporation Retarder: Waterborne, monomolecular, film forming, manufactured for application to fresh concrete.

Clear, Waterborne, Membrane-Forming Curing Compound: ASTM C 309, Type 1, Class B, dissipating.

RELATED MATERIALS

Joint Fillers: ASTM D 1752, Type II, cork or self-expanding cork in preformed strips.

CONCRETE MIXTURES

Prepare design mixtures, proportioned according to ACI 301 (ACI 301M), with the following properties:

Compressive Strength (28 Days): 4000 psi, minimum.

Maximum Water-Cementitious Materials Ratio at Point of Placement: 0.45.

Slump Limit: 4 inches (100 mm), plus or minus 1 inch (25 mm).

Air Content: 6 percent plus or minus 1.5 percent.

Chemical Admixtures: Use admixtures according to manufacturer's written instructions.

CONCRETE MIXING

Ready-Mixed Concrete: Measure, batch, and mix concrete materials and concrete according to ASTM C 94/C 94M[ and ASTM C 1116/C 1116M]. Furnish batch certificates for each batch discharged and used in the Work.

Mixing and delivery of the concrete shall comply with ASTM C 94 or ASTM C 685.

EXECUTION

EXAMINATION AND PREPARATION

Proof-roll prepared subbase surface below concrete paving to identify soft pockets and areas of excess yielding.

Remove loose material from compacted subbase surface immediately before placing concrete.

EDGE FORMS AND SCREED CONSTRUCTION

Protection: Proof-roll prepared subbase surface below concrete paving to identify soft pockets and areas of excess yielding.

Remove loose material from compacted subbase surface immediately before placing concrete.

STEEL REINFORCEMENT

General: Comply with CRSI's "Manual of Standard Practice" for fabricating, placing, and supporting reinforcement.

JOINTS

General: Form construction, isolation, and contraction joints and tool edges true to line, with faces perpendicular to surface plane of concrete. Construct transverse joints at right angles to centerline unless otherwise indicated.

Construction Joints: Set construction joints at side and end terminations of paving and at locations where paving operations are stopped for more than one-half hour unless paving terminates at isolation joints.

Isolation Joints: Form isolation joints of preformed joint-filler strips abutting concrete curbs, catch basins, manholes, inlets, structures, other fixed objects, and where indicated.

Contraction Joints: 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, to match jointing of existing adjacent concrete paving:

Edging: After initial floating, tool edges of paving, gutters, curbs, and joints in concrete with an edging tool to a 1/4-inch (6-mm) radius. Repeat tooling of edges after applying surface finishes. Eliminate edging-tool marks on concrete surfaces.

CONCRETE PLACEMENT

Moisten subbase to provide a uniform dampened condition at time concrete is placed.

Comply with ACI 301 (ACI 301M) requirements for measuring, mixing, transporting, placing, and consolidating concrete.

Deposit and spread concrete in a continuous operation between transverse joints. Do not push or drag concrete into place or use vibrators to move concrete into place.

Screed paving surface with a straightedge and strike off.

Commence initial floating using bull floats or darbies to impart an open-textured and uniform surface plane before excess moisture or bleed water appears on the surface. Do not further disturb concrete surfaces before beginning finishing operations or spreading surface treatments.

FLOAT FINISHING

General: Do not add water to concrete surfaces during finishing operations.

Float Finish: Begin the second floating operation when bleed-water sheen has disappeared, and concrete surface has stiffened sufficiently to permit operations. Float surface with power-driven floats or by hand floating if area is small or inaccessible to power units. Finish surfaces to true planes. Cut down high spots and fill low spots. Refloat surface immediately to uniform granular texture.

Medium-to-Fine-Textured Broom Finish: Draw a soft-bristle broom across float-finished concrete surface perpendicular to line of traffic to provide a uniform, fine-line texture.

Apply curing immediately after final finishing.

CONCRETE PROTECTION AND CURING

General: Protect freshly placed concrete from premature drying and excessive cold or hot temperatures.

Comply with ACI 306.1 for cold-weather protection.

Evaporation Retarder: Apply evaporation retarder to 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.

Begin curing after finishing concrete but not before free water has disappeared from concrete surface.

Curing Methods: Cure concrete by moisture curing, moisture-retaining-cover curing, curing compound or a combination of these.

REPAIRS AND PROTECTION

Remove and replace concrete paving that is broken, damaged, or defective or that does not comply with requirements in this Section. Remove work in complete sections from joint to joint unless otherwise approved by Architect.

Protect concrete paving from damage. Exclude traffic from paving for at least 14 days after placement. When construction traffic is permitted, maintain paving as clean as possible by removing surface stains and spillage of materials as they occur.

Maintain concrete paving free of stains, discoloration, dirt, and other foreign material. Sweep paving not more than two days before date scheduled for Substantial Completion inspections.

ATTACHMENTS

Sidewalk Detail.

END OF SECTION 321313

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