SECTION03300_CONCRETE.pdf

03300-1 Cast-in-Place Concrete

SECTION 03300

CAST-IN-PLACE CONCRETE

PART 1 GENERAL

1.01 SCOPE OF WORK

A. Designing, planning and completion of the Work, in accordance with the requirements and intent of these Contract Documents, and to the satisfaction of the Owner. The

Work includes:

1. Prompt cleanup, removal, safe and proper disposal of all waste material resulting from the Work herein.

2. Prompt and proper removal, salvage, protection, storage and turnover to the

Owner of all surplus useable material resulting from the Work herein.

3. Installation of all expansion joint materials, inserts, sleeves, anchor bolts and other items to be embedded in cast-in-place concrete, including all inserts, sleeves, anchor bolts and other items furnished in accordance with other sections of the

Work.

4. Sampling and Testing of the cast-in-place concrete performed by an independent testing service acceptable to and approved by the Owner.

1.02 QUALITY ASSURANCE

A. Comply with the requirements and recommendations set forth in the current publications and addenda thereto of the following standards:

1. ACI 301, "Specification for Structural Concrete for Buildings".

2. ACI 306, "Recommended Practice for Cold Weather Concreting".

3. ACI 308, "Curing Concrete".

4. ACI 318, "Building Code Requirements for Reinforced Concrete".

5. ACI 605, "Recommended Practice for Hot Weather Concrete".

6. ACI 614, "Recommended Practice for Measuring, Mixing and Placing Concrete".

7. ASTM C94, "Specification for Ready-Mixed Concrete".

1.03 SUBMITTALS

A. Provide Submittals in conformance with:

1. Section _____, Submittals

PART 2 PRODUCTS

2.01 MATERIALS

A. Cement: Portland cement, ASTM C150, Type II, unless otherwise indicated. The same brands of cement shall be used throughout.

B. Coarse Aggregates: Cleanness Value of not less than 75 when tested as per CMM-Test

Method No. Calif. 227.

03300-2 Cast-in-Place Concrete

C. Fine Aggregates: Sand Equivalent of not less than 75 when tested per CMM-Test

Method No. Calif. 217

D. Combined Aggregates: Exact proportions of fine aggregates and coarse aggregates to be used in mix shall be determined by mix design.

E. Provide the following Concrete Classes unless otherwise indicated:

1. Maximum Size of Aggregates (inches) 3/4

2. Maximum Slump (in.) 4

3. Minimum 28-day Strength (psi) 3,000

PART 3 EXECUTION

A. INSTALLATION

1. Cast the concrete in-place to comply with requirements and recommendations set forth in the referenced Standards, and to sizes, shapes, lines and dimensions required for the Work, and as required to obtain accurate alignment, location, grades, level and plumb with the finished structures.

2. Provide not less than 3 inches of concrete between the outside of an electrical duct and the earth. Provide not less than 2 inches of concrete minimum encasement around the conduit. Where duct lines pass through concrete walls, concrete envelopes shall be extended through and finished flush with inside surfaces.

Provide watertight construction joints using water stops.

3. Position and install all expansion joint materials, inserts, sleeves, anchor bolts and other items to be embedded in cast-in-place concrete, including all expansion joint materials, inserts, sleeves, anchor bolts and other items furnished in accordance with other sections of the Work.

4. Maintain the Work to safely support all loads applied, including testing loads, until such loads can be satisfactorily supported by the structure.

5. Maintain the work to cure properly and safely, until the curing is satisfactorily completed.

6. Use walls of trench to form sidewalls of duct bank where soil is self-supporting and concrete envelope can be poured without soil inclusions; otherwise, use forms.

7. Spade concrete carefully during pours to prevent voids under and between conduits and at exterior surface of envelope. Do not allow a heavy mass of concrete to fall directly onto ducts. Use a plank to direct concrete down sides of bank assembly to trench bottom. Allow concrete to flow to the center of bank and rise up in middle, uniformly filling all open spaces. Do not use power-driven agitating equipment unless specifically designed for duct-bank applications. Pour each run of envelope between manholes or other terminations in one continuous operation. If more than one pour is necessary, terminate each pour in a vertical plane and install 3/4-inch reinforcing rod dowels extending 18 inches into concrete on both sides of joint near corners of envelope.

8. Install reinforcement in duct banks passing through disturbed earth near buildings and other excavations or when crossing a road.

03300-3 Cast-in-Place Concrete

9. Sample and test the cast-in-place concrete, in accordance with the referenced

Standards herein and according to the Standards of Practice acceptable to the

Owner, and demonstrating satisfactory compliance with the Contract Document requirements, and including:

a. Provide slump tests immediately prior to casting.

b. Provide breakage strength tests at the 7-day cure, and 28-day cure.

c. Provide in-place load tests after the full strength cure is completed.

END OF SECTION