61-Sec 03 30 00 - CAST IN PLACE CONCRETE.pdf

CAST-IN-PLACE CONCRETE

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SECTION 03 30 00

PART 1 – GENERAL

1.01 SECTION INCLUDES

A. Plain Cement Concrete Curbs

B. Concrete Curb Ramps and Sidewalk

1.02 RELATED SECTIONS

A. Related Work Specified Elsewhere:

1. Section 03 11 00: Concrete Formwork

1.03 REFERENCES

A. ACI 301: Structural Concrete for Buildings.

B. ACI 302: Guide for Concrete Floor and Slab Construction.

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

Concrete.

D. ACI 305R: Hot Weather Concreting.

E. ACI 306R: Cold Weather Concreting.

F. ACI 308: Standard Practice for Curing Concrete.

G. ASTM C31: Practices for Making and Curing Concrete Test Specimens in the Field.

H. ASTM C33: Concrete Aggregates.

I. ASTM C39: Test Method for Compressive Strength of Cylindrical Concrete Specimens.

J. ASTM C42: Methods of Obtaining and Testing Drilled Cores and Sawed Beams of Concrete.

K. ASTM C94: Ready-Mixed Concrete.

L. ASTM C150: Portland Cement.

M. ASTM C172: Method of Sampling Fresh Mixed Concrete.

N. ASTM C260: Air Entraining Admixtures for Concrete.

O. ASTM C494: Chemical Admixtures for Concrete.

P. ASTM C618: Fly Ash and Raw or Calcinated Natural Pozzolan for Use as a Mineral

Admixture in Portland Cement Concrete.

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Q. ASTM D1751: Preformed Expansion Joint Fillers for Concrete Paving and Structural Construction (Non-extruding and Resilient Bituminous Types).

1.04 SUBMITTALS FOR REVIEW

A. Product Data: Provide concrete delivery form.

1.05 QUALITY ASSSURANCE

A. Perform Work in accordance with ACI 301.

B. Maintain one copy of each document on-site.

C. Acquire cement and aggregate from same source for all Work.

D. Conform to ACI 305R when concreting during hot weather.

E. Conform to ACI 306R when concreting during cold weather.

PART 2 – PRODUCTS

2.01 CONCRETE MATERIALS

A. Cement: ASTM C150, Type I – Normal.

B. Fine and Coarse Aggregates: ASTM C33.

C. Water: Clean and not detrimental to concrete.

2.02 ADMIXTURES

A. Air Entrainment: ASTM C260.

B. Chemical: ASTM C494 – Type A – Water Reducing, Type C – Accelerating, Type E – Water

Reducing and Accelerating.

C. Fly Ash: ASTM C618.

2.03 ACCESSORIES

A. Non-Shrink Grout: Premixed compound consisting of non-metallic aggregate, cement, water reducing and plasticizing agents; capable of developing minimum compressive strength of 2,400 psi in 48 hours and 7,000 psi in 28 days.

2.04 JOINT DEVICES AND FILLER MATERIALS

A. Joint Filler Type A: ASTM D1751; Asphalt impregnated fiberboard or felt, 1/4 inch thick;

tongue and groove profile.

2.05 CONCRETE MIX

A. Mix concrete in accordance with ACI 304 and Section 704, PennDOT Publication 408

Specifications. Deliver concrete in accordance with ASTM C94 and Section 704, PennDOT Publication 408 Specifications.

B. Select proportions for normal weight concrete in accordance with ACI 301 Method 1.

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C. Provide concrete to meet the criteria in Section 704 of PennDOT Publication 408 for the applicable Class of concrete for the use. Supply Class A and/or Class AA concrete as necessary to comply with the Contract Documents, including Drawings.

D. Use accelerating admixtures in cold weather only when approved by Engineer. Use of admixtures will not relax cold weather placement requirements.

E. Use calcium chloride only when approved by Design Engineer.

F. Use set retarding admixtures during hot weather only when approved by Design Engineer.

G. Add air entraining agent to normal weight concrete mix for work exposed to exterior.

PART 3 – EXECUTION

3.01 EXAMINATION

A. Verify site conditions in accordance with the Contract Documents.

B. Verify requirements for concrete cover over reinforcement.

C. Verify that anchors, seats, plates, reinforcement and other items to be cast into concrete are accurately placed, positioned securely, and will not cause hardship in placing concrete.

3.02 PREPARATION

A. Prepare previously placed concrete by cleaning with steel brush and applying bonding agent in accordance with manufacturer’s instructions.

B. In locations where new concrete is doweled to existing work, drill holes in existing concrete, insert steel dowels and pack solid with non-shrink grout.

C. Coordinate the placement of joint devices with erection of concrete formwork and placement of form accessories.

3.03 PLACING CONCRETE

A. Place concrete in accordance with ACI 304.

B. Notify Engineer minimum 24 hours prior to commencement of operations.

C. Ensure reinforcement, inserts, embedded parts, formed expansion and contraction joints are not disturbed during concrete placement.

3.04 CONCRETE FINISHING

A. Broom finish.

3.05 CURING AND PROTECTION

A. Immediately after placement, protect concrete from premature drying, excessively hot or cold temperatures, and mechanical injury.

B. Maintain concrete with minimal moisture loss at relatively constant temperature for period necessary for hydration of cement and hardening of concrete.

3.06 FIELD QUALITY CONTROL

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A. Contractor will provide testing, adjusting, and balancing as directed by Design Engineer during construction to provide quality control.

B. Provide free access to Work and cooperate with appointed firm.

3.07 PATCHING

A. Allow Engineer to inspect concrete surfaces immediately upon removal of forms.

B. Excessive honeycomb or embedded debris in concrete is not acceptable. Notify Engineer upon discovery.

C. Patch imperfections in accordance with ACI 301.

D. Remove or break off form ties for walls and seal openings with non-shrink grout providing a smooth finish.

3.08 DEFECTIVE CONCRETE

A. Defective Concrete: Concrete not conforming to required lines, details, dimensions, tolerances or specified requirements.

B. Repair or replacement of defective concrete will be determined by the Engineer.

C. Do not patch, fill, touch-up, repair, or replace exposed concrete except upon express direction of Engineer for each individual area.

END OF SECTION