36C25218R0104-00002003.pdf

CLEMENT J. ZABLOCKI MEDICAL CENTER DEPARTMENT OF VETERAN AFFAIRS

MILWAUKEE, WI

Upgrade Elevators Buildings 5 & 6A Wing

VA PROJECT: 695-17-116

Amendment 00002

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SECTION 03 30 53

(SHORT-FORM) CAST-IN-PLACE CONCRETE

PART 1 - GENERAL

1.1 DESCRIPTION:

This section specifies cast-in-place structural concrete and material and mixes for other concrete.

1.2 RELATED WORK:

Materials testing and inspection during construction: Section 01 45 29, TESTING LABORATORY SERVICES.

1.3 TOLERANCES:

ACI 117.

1.4 REGULATORY REQUIREMENTS:

A. ACI SP-66 ACI Detailing Manual

B. ACI 318 - Building Code Requirements for Reinforced Concrete.

1.5 SUBMITTALS:

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

B. Concrete Mix Design.

C. Shop Drawings: Reinforcing steel: Complete shop drawings.

D. Manufacturer's Certificates: Air-entraining admixture, chemical admixtures, curing compounds.

1.6 APPLICABLE PUBLICATIONS:

A. Publications listed below form a part of this specification to extent referenced. Publications are referenced in text by basic designation only.

B. American Concrete Institute (ACI):

117-10..................Specification for Tolerances for Concrete

Construction, Materials and Commentary

211.1-91(R2009).........Standard Practice for Proportions for Normal, Heavyweight, and Mass Concrete

301-10..................Specifications for Structural Concrete

305.1-06................Specification for Hot Weather Concreting

306.1-90(R2002).........Standard Specification for Cold Weather

Concreting

SP-66-04 ...............ACI Detailing Manual

318-11..................Building Code Requirements for Structural

Concrete and Commentary

347-04..................Guide to Formwork for Concrete

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C. American Society for Testing And Materials (ASTM):

A615/A615M-09...........Standard Specification for Deformed and Plain

Carbon Steel Bars for Concrete Reinforcement

C31/C31M-10.............Standard Practice for Making and Curing Concrete

Test Specimens in the Field

C33/C33M-11a............Standard Specification for Concrete Aggregates

C39/C39M-12.............Standard Test Method for Compressive Strength of

Cylindrical Concrete Specimens

C94/C94M-12.............Standard Specification for Ready Mixed Concrete

C143/C143M-10...........Standard Test Method for Slump of Hydraulic

Cement Concrete

C150-11.................Standard Specification for Portland Cement

C171-07.................Standard Specification for Sheet Material for

Curing Concrete

C172-10.................Standard Practice for Sampling Freshly Mixed

Concrete

C173-10.................Standard Test Method for Air Content of Freshly

Mixed Concrete by the Volumetric Method

C192/C192M-07...........Standard Practice for Making and Curing Concrete

Test Specimens in the Laboratory

C231-10.................Standard Test Method for Air Content of Freshly

Mixed Concrete by the Pressure Method

C260-10.................Standard Specification for Air-Entraining

Admixtures for Concrete

C494/C494M-11...........Standard Specification for Chemical Admixtures for Concrete

C618-12.................Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete

D4397-10................Standard Specification for Polyethylene Sheeting for Construction, Industrial and Agricultural

Applications

PART 2 - PRODUCTS

2.1 FORMS:

Wood, plywood, metal, or other materials, approved by Resident Engineer, of grade or type suitable to obtain type of finish specified.

2.2 MATERIALS:

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

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B. Fly Ash: ASTM C618, Class C or F including supplementary optional requirements relating to reactive aggregates and alkalis, and loss on ignition (LOI) not to exceed 5 percent.

C. Coarse Aggregate: ASTM C33, Size 67.

D. Fine Aggregate: ASTM C33.

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

F. Air-Entraining Admixture: ASTM C260.

G. Chemical Admixtures: ASTM C494.

H. Reinforcing Steel: ASTM A615, deformed. See structural drawings for grade.

I. Sheet Materials for Curing Concrete: ASTM C171.

J. 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 3 days or thereafter based on initial measurement made at time of placement, and produce a compressive strength of at least 18mpa (2500 psi) at 3 days and 35mpa (5000 psi) at

28 days.

2.3 CONCRETE MIXES:

A. Design of concrete mixes using materials specified shall be the responsibility of the Contractor as set forth under Option C of ASTM

C94.

B. Compressive strength at 28 days shall be not less than 30 Mpa (4000 psi).

C. Establish strength of concrete by testing prior to beginning concreting operation. Test consists of average of three cylinders made and cured in accordance with ASTM C192 and tested in accordance with ASTM C39.

D. Maximum slump for vibrated concrete is 100 mm (4 inches) tested in accordance with ASTM C143.

E. Cement and water factor (See Table I):

TABLE I - CEMENT AND WATER FACTORS FOR CONCRETE

Concrete: Strength Non-Air-Entrained Air-Entrained

Min. 28 Day Comp.

Str.

MPa (psi)

Min. Cement kg/m3 (lbs/c.

yd)

Max. Water

Cement Ratio

Min. Cement kg/m3

(lbs/c. yd)

Max. Water

Cement Ratio

30 (4000)1,3 325 (550) 0.55 340 (570) 0.50

1. If trial mixes are used, the proposed mix design shall achieve a compressive strength 8.3 MPa (1200 psi) in excess of f'c.

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4. Determined by Laboratory in accordance with ACI 211.1 for normal concrete.

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

TABLE I - TOTAL AIR CONTENT

FOR VARIOUS SIZES OF COARSE AGGREGATES (NORMAL CONCRETE)

Nominal Maximum Size of

Coarse Aggregate

Total Air Content

Percentage by Volume

10 mm (3/8 in) 6 to 10

13 mm (1/2 in) 5 to 9

19 mm (3/4 in) 4 to 8

25 mm (1 in) 3 1/2 to 6 1/2

40 mm (1 1/2 in) 3 to 6

2.4 BATCHING & MIXING:

A. Store, batch, and mix materials as specified in ASTM C94.

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

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

PART 3 - EXECUTION

3.1 FORMWORK:

A. Installation conform to ACI 347. 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. Treating and Wetting: Treat or wet contact forms as follows:

1. Coat plywood and board forms with non-staining form sealer. In hot weather cool forms by wetting with cool water just before concrete is placed.

2. Clean and coat removable metal forms with light form oil before reinforcement is placed. In hot weather cool metal forms by thoroughly wetting with water just before placing concrete.

3. Use sealer on reused plywood forms as specified for new material.

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

D. Construction Tolerances:

1. Contractor is responsible for setting and maintaining concrete formwork to assure erection of completed work within tolerances specified to accommodate installation or other rough and finish materials. Remedial work necessary for correcting excessive tolerances is the responsibility of the Contractor. Erected work that exceeds specified tolerance limits shall be remedied or removed and replaced, at no additional cost to the Government.

2. Permissible surface irregularities for various classes of materials are defined as "finishes" in specification sections covering individual materials. They are to be distinguished from tolerances specified which are applicable to surface irregularities of structural elements.

3.2 REINFORCEMENT:

Details of concrete reinforcement, unless otherwise shown, in accordance with ACI 318 and ACI SP-66. Support and securely tie reinforcing steel to prevent displacement during placing of concrete.

3.3 PLACING CONCRETE:

A. Before placing 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.

B. Convey concrete from mixer to final place of deposit by method which will prevent segregation or loss of ingredients. Do not deposit in work concrete that has attained its initial set or has contained its water or cement more than 1 1/2 hours. Do not allow concrete to drop freely more than 1500 mm (5 feet) in unexposed work nor more than 900 mm (3 feet) in exposed work. Place and consolidate concrete in horizontal layers not exceeding 300 mm (12 inches) in thickness. Consolidate concrete by spading, rodding, and mechanical vibrator. Do not secure vibrator to forms or reinforcement. Vibration shall be carried on continuously with placing of concrete.

C. Hot weather placing of concrete: Follow recommendations of ACI 305R to prevent problems in the manufacturing, placing, and curing of concrete

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03 30 53 - 6 that can adversely affect the properties and serviceability of the hardened concrete.

D. Cold weather placing of concrete: Follow recommendations of ACI 306R, to prevent freezing of thin sections less than 300 mm (12 inches) and to permit concrete to gain strength properly, except that use of calcium chloride shall not be permitted without written approval from Resident

Engineer.

3.4 PROTECTION AND CURING:

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 Resident

Engineer.

3.5 FORM REMOVAL:

Forms 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.

3.6 SURFACE PREPARATION:

Immediately after forms have been removed and work has been examined and approved by Resident Engineer, remove loose materials, and patch all stone pockets, surface honeycomb, or similar deficiencies with cement mortar made with 1 part portland cement and 2 to 3 parts sand.

3.7 FINISHES:

Slab Finishes:

Steel Trowel Finish: Applied toppings, concrete surfaces to receive resilient floor covering or carpet, future floor roof and all monolithic concrete floor slabs exposed in finished work and for which no other finish is shown or specified shall be steel troweled.

Final steel troweling to secure a smooth, dense surface shall be delayed as long as possible, generally when the surface can no longer be dented with finger. During final troweling, tilt steel trowel at a slight angle and exert heavy pressure on trowel to compact cement paste and form a dense, smooth surface. Finished surface shall be free of trowel marks, uniform in texture and appearance.

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