Atch__32_-_CIP_Concrete_Specifications.pdf

UHHZ170241 Mech-Elec IDIQ

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SECTION 03 30 53

MISCELLANEOUS CAST-IN-PLACE CONCRETE

PART 1. GENERAL

1.01 DESCRIPTION

A. This section covers all cast-in-place structural concrete, and material and mixes for other concrete.

1.02 TOLERANCES

A. Float and Broom Finish: Plane within 1/4-inch in ten (10) feet as determined by a ten (10) foot straightedge.

B. Steel Trowel Finish: Plane within 1/8-inch to ten (10) feet, 1/4-inch on metal deck, as determined by a ten (10) foot straightedge.

C. Formed Surfaces: ACI 301.

D. Reinforcement (Fabricating and Placing): ACI 301

1.03 REGULATORY REQUIREMENTS

A. ACI 315.

B. ACI 318.

1.04 SUBMITTALS

A. In accordance with Section 01300, SUBMITTALS AND CONTRACTOR FURNISHED ITEMS, furnish the following:

1. Concrete Mix Design:

2. Shop Drawings:

a. Reinforcing Steel

3. Manufacturer's Certificates:

a. Air-entraining admixture

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b. Water reducing admixture

1.05 APPLICABLE PUBLICATIONS

The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only.

A. American Society For Testing And Materials (ASTM):

A185-79... Welded Steel Wire Fabric for Concrete Reinforcement A615-82.... Deformed and Plain Billet-Steel Bars for Concrete Reinforcement A616-82.... Rail-Steel Deformed and Plain Bars for Concrete Reinforcement C31-83..... Making and Curing Concrete Test Specimens in the Field C33-82......Concrete Aggregates C39-81......Compressive Strength of Cylindrical Concrete Specimens C94-83......Ready-Mixed Concrete C143-78.....Slump of Portland Cement Concrete C150-83.... Portland Cement C171-69(1975). Sheet Material for Curing Concrete C172-71(1977)..Sampling Fresh Concrete C173-78........Air Content of Freshly Mixed Concrete by the Volumetric Method C192-81........Making and Curing Concrete Test Specimens in the Laboratory C231-82.......Air Content of Freshly Mixed Concrete by the Pressure Method C260-77......Air-Entraining Admixtures for Concrete C494-82......Chemical Admixtures for Concrete D1751-73(1978)..Preformed Expansion Joint Fillers for Concrete Paving and Structural Construction (Non-extruding and Resilient Bituminous Types)

B. American Concrete Institute (ACI):

301-72(1981)....Specification for Structural Concrete for Buildings 305-72......Recommended Practice for Hot Weather Concreting 306-66......Recommended Practice for Cold Weather Concreting 315-74......Manual of Standard Practice for Detailing Reinforced Concrete Structures

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318-77......Building Code Requirements for Reinforced Concrete 347-68......Recommended Practice for Concrete Formwork

C. U. S. Department of Commerce, National Bureau of Standards (NBS):

PS17-69 Polyethylene Sheeting (Construction, and Agricultural Applications)

PART 1. PRODUCTS

2.01 FORMS

A. Forms may be wood, plywood, metal, or other materials, approved by contracting officer, of grade or type suitable to obtain type of finish specified.

2.02 MATERIAL

A. Portland Cement: ASTM C150, Type I or II.

B. Coarse Aggregate: ASTM C33, Size 67. Size 467 may be used for footings and walls over 12 inches thick. Coarse aggregate for applied topping and metal pan stair fill shall be Size 7.

C. Fine Aggregate: ASTM C33.

D. Mixing Water: Fresh, clean, and potable.

E. Air-Entraining Admixture: ASTM C260.

F. Chemical Admixture: ASTM C494, Type A.

G. Vapor Barrier: PS17, six (6) mil.

H. Reinforcing Steel: ASTM A615 or ASTM A616, deformed.

I. Welded Wire Fabric: ASTM A185.

J. Expansion Joint Filler: ASTM D1751.

K. Sheet Materials for Curing Concrete: ASTM C171.

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L. Abrasive Aggregates: Aluminum oxide grains or emery grits.

M. Liquid Hardener and Dustproofer: Fluosilicate solution or magnesium fluosilicate or zinc fluosilicate. Magnesium and zinc may be used separately or in combination as recommended by manufacturer.

N. Grout, Non-Shrinking: Premixed ferrous or non-ferrous, mixed and applied in accordance with manufacturer's recommendations. Grout shall show no settlement or vertical drying shrinkage at three (3) days or thereafter based on initial measurement made at time of placement, and produce a compressive strength of at least 5,000 psi at three (3) days.

2.03 MIXES

A. The design of the concrete mixes using the materials specified shall be the responsibility of the contractor as set forth under Alternative No. 3 of ASTM C94. The concrete shall be Type D and have the following characteristics:

1. Compressive strength at 28 days shall be not less than 4,000 psi.

2. The strength of the concrete proposed for use shall be established by testing prior to beginning concreting operation. A test consists of the average of three (3) cylinders made and cured in accordance with ASTM C192 and tested in accordance with ASTM C39.

3. Slump shall not be more than four (4) inches for vibrated concrete tested in accordance with ASTM C143.

4. Minimum cement factor (bags of cement per cubic yard) shall be as follows:

TYPE D

a. Non-Air-Entrained............... 6.0

b. Air-Entrained................... 6.0

5. Air-entrainment is required for all exterior concrete. Air content shall conform with the following table:

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Nominal Maximum Size of Coarse Total Air Content Percent Aggregate, Inches By Volume

3/8 ................... 6 to 10 1/2 .................... 5 to 9 3/4 .................... 4 to 8 1 .................... 3-1/2 to 6-1/2 1-1/2 ......................... 3 to 6

2.05 MIXING

A. Materials shall be stored, batched, and mixed as specified in ASTM C94.

1. Job-Mixed: Concrete mixed at job site shall be mixed in a batch mixer in the manner specified for stationary mixers in ASTM C94.

2. Ready-Mixed: Ready-mixed concrete shall comply with ASTM C94, except that the use of non-agitating equipment for transporting concrete to the site will not be permitted. With each load of concrete delivered to the project, the ready-mixed concrete producer shall furnish, in duplicate, certification as required by ASTM C94.

3. Hand-Mixed: Hand-mixed concrete will be permitted only when such use is approved by contracting officer, but in no case in amounts exceeding one (1) sack of cement per batch. Proportions for concrete shall be one (1) part cement to five (5) parts aggregate. Mixing shall be accomplished in a manner to obtain required consistency and strength.

PART 3 - EXECUTION

3.01 FORMWORK

A. Installation of formwork shall conform to ACI 347. Formwork shall be sufficiently tight to hold concrete without leakage, sufficiently braced to withstand vibration of concrete, and to carry, without appreciable deflection, all dead and live loads to which they may be subjected.

B. Treat and wet contact surfaces forms as follows:

1. Plywood: Coat with non-staining form sealer. In hot weather, cool forms by wetting with cool water just before concrete is placed.

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2. Wood Forms: Coat with non-staining form sealer. In hot weather, cool forms by wetting with cool water just before concrete is placed.

3. Removable Metal Forms: Clean and coat with a light form oil before reinforcement is placed. In hot weather, cool metal forms by thoroughly wetting with water just before placing concrete.

3.02 REINFORCEMENT

A. Details of concrete reinforcement, unless otherwise shown, shall be in accordance with ACI 318 and 315. All reinforcing steel shall be supported by supports and securely tied to prevent displacement during the placing of concrete.

3.03 INSERTS, SLEEVES, AND SIMILAR EMBEDDED ITEMS

A. Required flashing reglets, masonry ties, anchors, inserts, wires, hangers, sleeves, boxes for floor hinges and all other items specified as furnished under this and other sections of specifications and required to be in their final position at the time concrete is placed shall be properly located, accurately positioned and built into construction, and maintained securely in place.

3.04 PLACING CONCRETE

A. Remove water from excavations before concrete is deposited. Remove hardened concrete, debris and other foreign materials from interior of forms, and from inside of mixing and conveying equipment. Obtain approval of contracting officer before placing concrete. Provide screens at required elevations for concrete slabs.

B. Before depositing new concrete on or against concrete which has set, existing surfaces shall be roughened and cleaned free from all laitance, foreign matter, and loose particles.

C. Convey concrete from mixer to final place of deposit by method which will prevent segregation or loss of ingredients. Concrete that has attained its initial set or has contained its water or cement more than 1-1/2 hours shall not be deposited in work. Concrete shall not be allowed to drop freely more than five (5) feet in unexposed work nor more than three (3) feet in exposed work. Concrete shall be placed and consolidated in horizontal layers not exceeding 12 inches in thickness. All concrete shall be consolidated by

03 30 53-7 of 7 spading, rodding, and mechanical vibrator. Vibrator shall not be secured to forms or reinforcement. Vibration shall be carried on continuously with placing of concrete.

D. Cold weather placing of concrete shall conform to ACI 306, except that the use of calcium chloride shall not be permitted without written approval from the contracting officer.

E. Hot weather placing of concrete shall conform to ACI 305.

3.05 PROTECTION AND CURING

A. Protect exposed surfaces of concrete from premature drying, wash by rain or running water, wind, mechanical injury, and excessively hot or cold temperature. Curing method shall be subject to approval by contracting officer.

3.06 FORM REMOVAL

A. Forms shall remain in place until concrete has a sufficient strength to carry its own weight and loads supported. Removal of forms at any time is the contractor's sole responsibility.

3.07 SURFACE PREPARATION

A. Immediately after forms have been removed and work has been examined and approved by contracting officer, all loose materials shall be removed and all stone pockets, surface honeycomb, or similar deficiencies shall be patched with cement mortar made with one (1) part cement and two (2) to three (3) parts sand.

3.08 FINISHES

1. Broom Finish: Finish all exterior slabs, ramps, and stair treads with a bristle brush moistened with clear water after the surfaces have been floated.

END OF SECTION