Revised Lask Spec 03 30 53.pdf

SECTION 03 30 53 Page 1

SECTION 03 30 53

MISCELLANEOUS CAST-IN-PLACE CONCRETE

PART 1 GENERAL

1.1 SUMMARY

Perform all work in accordance withACI 318M Host Nation and EU regulations and Host Nation and EU standard industry practices.

1.2 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for Contractor Quality Control approval. Submit the following in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Installation Drawings; G

SD-03 Product Data Air-Entraining Admixture Water-Reducing or Retarding Admixture Curing Materials Joint Sealants - Field Molded Sealants Batching and Mixing Equipment Conveying and Placing Concrete Formwork Mix Design Data; G Ready-Mix Concrete Curing Compound Mechanical Reinforcing Bar Connectors

SD-06 Test Reports

Aggregates Concrete Mixture Proportions; G Compressive Strength Testing; G Slump; G Air Content Water

SD-07 Certificates

Cementitious Materials Pozzolan Aggregates Delivery Tickets

SD-08 Manufacturer's Instructions

Curing Compound

1.3 QUALITY ASSURANCE

Indicate specific locations of Concrete Placement Forms Steel Reinforcement on installation drawings and include, but not be limited to, square meters of concrete placements, thicknesses and widths, plan dimensions, and arrangement of cast-in-place concrete section.

SECTION 03 30 53 Page 2

PART 2 PRODUCTS

2.1 SYSTEM DESCRIPTION

The Government retains the option to sample and test aggregates and concrete to determine compliance with the specifications. Provide facilities and labor as may be necessary to assist the Government in procurement of representative test samples. Obtain samples of aggregates at the point of batching. Sample concrete in accordance with standard industry practices. Determine slump and air content in accordance with per approved standard, when cylinders are molded. Prepare, cure, and transport compression test specimens in accordance with standard industry practices.

Test compression test specimens in accordance with an approved standard.

Take samples for strength tests not less than once each shift in which concrete is produced. Provide a minimum of five specimens from each sample;

two to be tested at 28 days (90 days if pozzolan is used) for acceptance, two will be tested at 7 days for information and one held in reserve.

2.1.1 Strength

Acceptance test results are the average strengths of two specimens tested at 28 days (90 days if pozzolan is used). The strength of the concrete is considered satisfactory so long as the average of three consecutive acceptance test results equal or exceed the specified compressive strength, f'c, but not more than 20 percent, and no individual acceptance test result falls below f'c by more than 3.4 MPa.

2.1.2 Construction Tolerances

Apply a Class "C" finish to all surfaces except those specified to receive a Class "D" finish. Apply a Class "D" finish to all post-construction surfaces which will be permanently concealed.

2.1.3 Concrete Mixture Proportions

Concrete mixture proportions are the responsibility of the Contractor.

Mixture proportions must include the dry weights of cementitious material(s); the nominal maximum size of the coarse aggregate; the specific gravities, absorptions, and saturated surface-dry weights of fine and coarse aggregates; the quantities, types, and names of admixtures; and quantity of water per cubic meter of concrete. Provide materials included in the mixture proportions of the same type and from the same source as will be used on the project. The specified compressive strength f'c is

20.7 MPa at 28 days. The maximum nominal size coarse aggregate is 25 mm.

The air content must be between 4.5 and 7.5 percent with a slump between 50 and 125 mm. The maximum water-cementitious material ratio is 0.50.

Submit the applicable test reports and mixture proportions that will produce concrete of the quality required, ten days prior to placement of concrete.

2.2 MATERIALS

Submit manufacturer's literature from suppliers which demonstrates compliance with applicable specifications for the specified materials.

2.2.1 Cementitious Materials

Submit Manufacturer's certificates of compliance, accompanied by mill test reports, attesting that the concrete materials meet the requirements of the

SECTION 03 30 53 Page 3 specifications in accordance with the Special Clause "CERTIFICATES OF COMPLIANCE". Provide cementitious materials that conform to the appropriate specifications listed:

2.2.1.1 Portland Cement

PN-B-19707:2013, Class 42.5, low alkali with tri-calcium aluminates (C3A) content less than 10 percent and a maximum cement-alkali content of 0.80 percent Na2Oe (sodium oxide) equivalent.

2.2.1.2 Pozzolan

Provide pozzolan that conforms to EN 197-1:2011 "Cement - Composition, Specifications and Conformity Criteria for Common Cements", Class V (siliceous)

2.2.2 Aggregates

For fine and coarse aggregates meet standard industry requirements for quality and grading.

2.2.3 Admixtures

Provide admixtures, when required or approved, in compliance with the appropriate specification listed. Retest chemical admixtures that have been in storage at the project site, for longer than 6 months or that have been subjected to freezing, at the expense of the Contractor at the request of the Contracting Officer and will be rejected if test results are not satisfactory.

2.2.3.1 Air-Entraining Admixture

Provide air-entraining admixture that meets standard industry requirements.

2.2.3.2 Water-Reducing or Retarding Admixture

Provide water-reducing or retarding admixture meeting standard industry requirements if necessary.

2.2.4 Water

Mixing and curing water in compliance with the requirements of PN-EN 1008:2004 "Mixing Water for Concrete"; potable, and free of injurious amounts of oil, acid, salt, or alkali.

2.2.5 Reinforcing Steel

Provide reinforcing bars conforming to standard industry requirements.

Provide welded steel wire reinforcement conforming to standard industry requirements.

2.2.6 Formwork

Fabricate of wood, steel, or other approved material. Submit formwork design prior to the first concrete placement.

SECTION 03 30 53 Page 4

Form Coatings

Provide form coating in accordance with ACI 301M standard industry practices.

2.2.7 Curing Materials

Provide curing materials in accordance with ACI 301M standard industry practices and the approved submittal.

2.3 READY-MIX CONCRETE

Provide ready-mix concrete with mix design data conforming to ACI 301M standard industry practices and the approved submittal. Submit delivery tickets for each ready-mix concrete delivery, include the following additional information:

a. Type and brand cement

b. Cement content in 43 kilogram bags per cubic meter of concrete

c. Maximum size of aggregate

d. Amount and brand name of admixture

e. Total water content expressed by water cementitious material ratio

2.4 ACCESSORIES

2.4.1 Curing Compound

Provide curing compound conforming to standard industry practices and the approved submittal. Submit manufactures instructions for placing curing compound.

PART 3 EXECUTION

3.1 PREPARATION

Prepare construction joints to expose coarse aggregate. The surface must be clean, damp, and free of laitance. Construct ramps and walkways, as necessary, to allow safe and expeditious access for concrete and workmen. Remove snow, ice, standing or flowing water, loose particles, debris, and foreign matter. Satisfactorily compact earth foundations. Make spare vibrators available. Placement cannot begin until the entire preparation has been accepted by the Government.

3.1.1 Embedded Items

Secure reinforcement in place after joints, anchors, and other embedded items have been positioned. Arrange internal ties so that when the forms are removed the metal part of the tie is not less than 50 mm from concrete surfaces permanently exposed to view or exposed to water on the finished structures. Prepare embedded items so they are be free of oil and other foreign matters such as loose coatings or rust, paint, and scale. The embedding of wood in concrete is permitted only when specifically authorized or directed. Provide all equipment needed to place, consolidate, protect, and cure the concrete at the placement site

SECTION 03 30 53 Page 5 and in good operating condition.

3.1.2 Formwork Installation

Forms must be properly aligned, adequately supported, and mortar-tight.

Provide smooth form surfaces, free from irregularities, dents, sags, or holes when used for permanently exposed faces. Chamfer all exposed joints and edges, unless otherwise indicated.

3.1.3 Production of Concrete

3.1.3.1 Ready-Mixed Concrete

Provide ready-mixed concrete conforming to standard industry practices and the approved submittal except as otherwise specified.

3.1.3.2 Concrete Made by Volumetric Batching and Continuous Mixing

Conform to standard industry practices.

3.2 CONVEYING AND PLACING CONCRETE

Convey and place concrete in accordance with ACI 301M standard industry practices.

3.2.1 Cold-Weather Requirements

Place concrete in cold weather in accordance with standard industry practices

3.2.2 Hot-Weather Requirements

Place concrete in hot weather in accordance with standard industry practices

3.3 FINISHING

3.3.1 Temperature Requirement

Do not finish or repair concrete when either the concrete or the ambient temperature is below 10 degrees C.

3.3.2 Finishing Formed Surfaces

Remove all fins and loose materials, and surface defects including filling of tie holes. Repair all honeycomb areas and other defects. Remove all unsound concrete from areas to be repaired. Ream or chip surface defects greater than 13 mm in diameter and holes left by removal of tie rods in all surfaces not to receive additional concrete and fill with dry-pack mortar.

Brush-coat the prepared area with an approved epoxy resin or latex bonding compound or with a neat cement grout after dampening and filling with mortar or concrete. Use a blend of portland cement and white cement in mortar or concrete for repairs to all surfaces permanently exposed to view shall be so that the final color when cured is the same as adjacent concrete.

3.4 CURING AND PROTECTION

Cure and protect in accordance with ACI 301M standard industry practices.

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3.5 FORM WORK

Provide form work in accordance with ACI 301M standard industry practices.

3.5.1 Removal of Forms

Remove forms in accordance with ACI 301M standard industry practices.

3.6 STEEL REINFORCING

Reinforcement must be free from loose, flaky rust and scale, and free from oil, grease, or other coating which might destroy or reduce the reinforcement's bond with the concrete.

3.6.1 Fabrication

Shop fabricate steel reinforcement in accordance with standard industry practices. Provide shop details and bending in accordance with standard industry practices.

3.6.2 Splicing

Perform splices in accordance with standard industry practices.

3.6.3 Supports

Secure reinforcement in place by the use of metal or concrete supports, spacers, or ties.

3.7 EMBEDDED ITEMS

Before placing concrete, take care to determine that all embedded items are firmly and securely fastened in place. Provide embedded items free of oil and other foreign matter, such as loose coatings of rust, paint and scale.

Embedding of wood in concrete is permitted only when specifically authorized or directed.

3.8 TESTING AND INSPECTING

Report the results of all tests and inspections conducted at the project site informally at the end of each shift. Submit written reports weekly.

Deliver within three days after the end of each weekly reporting period.

See Section 01 45 00.00 10 QUALITY CONTROL.

3.8.1 Field Testing Technicians

The individuals who sample and test concrete must have demonstrated a knowledge and ability to perform the necessary test procedures equivalent to the ACI minimum guidelines for certification of Concrete Field Testing Technicians, Grade I.

3.8.2 Preparations for Placing

Inspect foundation or construction joints, forms, and embedded items in sufficient time prior to each concrete placement to certify that it is ready to receive concrete.

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3.8.3 Sampling and Testing

a. Obtain samples and test concrete for quality control during placement.

Sample fresh concrete for testing in accordance with standard industry practices. Make six test cylinders.

b. Test concrete for compressive strength at 7 and 28 days for each design mix and for every 77 cubic meters of concrete. Test two cylinders at 7 days; two cylinders at 28 days; and hold two cylinders in reserve.

Conform test specimens to standard industry practices. Perform compressive strength testing conforming to standard industry practices.

c. Test slump at the site of discharge for each design mix in accordance with standard industry practices. Check slump twice during each shift that concrete is produced.

d. Test air content for air-entrained concrete in accordance with standard industry practices. Check air content at least twice during each shift that concrete is placed.

e. Determine temperature of concrete at time of placement in accordance with standard industry practices. Check concrete temperature at least twice during each shift that concrete is placed.

3.8.4 Action Required

3.8.4.1 Placing

Do not begin placement until the availability of an adequate number of acceptable vibrators, which are in working order and have competent operators, has been verified. Discontinue placing if any lift is inadequately consolidated.

3.8.4.2 Air Content

Whenever an air content test result is outside the specification limits, adjust the dosage of the air-entrainment admixture prior to delivery of concrete to forms.

3.8.4.3 Slump

Whenever a slump test result is outside the specification limits, adjust the batch weights of water and fine aggregate prior to delivery of concrete to the forms. Make the adjustments so that the water-cementitious material ratio does not exceed that specified in the submitted concrete mixture proportion and the required concrete strength is still met.

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