Specs. 6.xps

Road "T" Security Gate091886D

SECTION 03 30 53

MISCELLANEOUS CAST-IN-PLACE CONCRETE

04/08

PART 1 GENERAL

1.1 SUMMARY

Perform all work in accordance with ACI MCP SET Parts 2 and 3.

1.2 UNIT PRICES Not Used.

1.2.1 Concrete Payment Not Used.

1.2.2 Measurement Not Used.

1.2.3 Unit of Measure Not Used.

Not Used..

1.3 REFERENCES

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

ACI INTERNATIONAL (ACI)

ACI MCP SET(2008) Manual of Concrete Practice

ASTM INTERNATIONAL (ASTM)

ASTM A 185/A 185M(2007) Standard Specification for Steel Welded Wire Reinforcement, Plain, for Concrete ASTM A 615/A 615M(2008b) Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement ASTM C 1064/C 1064M(2008) Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete ASTM C 1260(2007) Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method) ASTM C 143/C 143M(2008) Standard Test Method for Slump of Hydraulic-Cement Concrete ASTM C 150(2007) Standard Specification for Portland SECTION 03 30 53 Page 1

Cement ASTM C 1567(2008) Standard Test Method for Potential Alkali-Silica Reactivity of Combinations of Cementitious Materials and Aggregate (Accelerated Mortar-Bar Method) ASTM C 171(2007) Standard Specification for Sheet Materials for Curing Concrete ASTM C 172(2008) Standard Practice for Sampling Freshly Mixed Concrete ASTM C 173/C 173M(2008) Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method ASTM C 231(2008c) Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method ASTM C 260(2006) Standard Specification for Air-Entraining Admixtures for Concrete ASTM C 309(2007) Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete ASTM C 31/C 31M(2008a) Standard Practice for Making and Curing Concrete Test Specimens in the Field ASTM C 39/C 39M(2005e1e2) Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens ASTM C 494/C 494M(2008a) Standard Specification for Chemical Admixtures for Concrete ASTM C 595(2008) Standard Specification for Blended Hydraulic Cements ASTM C 618(2008a) Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete ASTM C 685/C 685M(2007) Concrete Made by Volumetric Batching and Continuous Mixing ASTM C 920(2008) Standard Specification for Elastomeric Joint Sealants ASTM C 94/C 94M(2007) Standard Specification for Ready-Mixed Concrete ASTM C 989(2006) Standard Specification for Ground Granulated Blast-Furnace Slag for Use in Concrete and Mortars ASTM D 1752(2004a; R 2008) Standard Specification for SECTION 03 30 53 Page 2

Preformed Sponge Rubber Cork and Recycled PVC Expansion ASTM D 75(2003) Standard Practice for Sampling Aggregates ASTM E 1155(1996; R 2008) Standard Test Method for Determining Floor Flatness and Floor Levelness Numbers ASTM E 1155M(1996; R 2008) Standard Test Method for Determining Floor Flatness and Floor Levelness Numbers (Metric) ASTM E 96/E 96M(2005) Standard Test Methods for Water Vapor Transmission of Materials

U.S. ARMY CORPS OF ENGINEERS (USACE)

COE CRD-C 400(1963) Requirements for Water for Use in Mixing or Curing Concrete COE CRD-C 572(1974) Specifications for Polyvinylchloride Waterstops

U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)

40 CFR 247Comprehensive Procurement Guideline for Products Containing Recovered Materials

1.4 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 in accordance with ASTM D 75. Sample concrete in accordance with ASTM C 172. Determine slump and air content in accordance with ASTM C 143/C 143M and ASTM C 231, respectively, when cylinders are molded. Prepare, cure, and transport compression test specimens in accordance with ASTM C 31/C 31M. Test compression test specimens in accordance with ASTM C 39/C 39M. Take samples for strength tests not less than once each shift in which concrete is produced . Provide a minimum of three specimens from each sample; two to be tested at 28 days (90 days if pozzolan is used) for acceptance, and one will be tested at 7 days for information.

1.4.1 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, and no individual acceptance test result falls below f'c by more than 500 psi.

1.4.2 Construction Tolerances

Apply a Class "C" finish to all surfaces except those specified to receive SECTION 03 30 53 Page 3 a Class "D" finish. Apply a Class "D" finish to all post-construction surfaces which will be permanently concealed. Surface requirements for the classes of finish required are as specified in Part 4 of ACI MCP SET.

1.4.3 Concrete Mixture Proportions

Concrete mixture proportions are the responsibility of the Contractor.

Mixture proportions shall 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 yard 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. Specified compressive strength f'c shall be 4,000 psi at 28 days (90 days if pozzolan is used). The maximum nominal size coarse aggregate is 1-1/2 inch, in accordance with ACI MCP SET Part

3. The air content shall be between 4.5 and 7.5 percent with a slump between 2 and 4 inches. The maximum water cement ratio is 0.50.

1.5 SUBMITTALS

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

submittals not having a "G" designation are for Contractor Quality Control and information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:

SD-03 Product Data Air-Entraining Admixture G [Accelerating Admixture G] Water-Reducing or Retarding Admixture G Curing Materials [Reinforcing Steel G] [Expansion Joint Filler Strips, Premolded] [Joint Sealants - Field Molded Sealants] [Waterstops] Manufacturer's literature from suppliers which demonstrates compliance with applicable specifications for the above materials.

Batching and Mixing Equipment Manufacturer's data for batching and mixing equipment which demonstrates compliance with the applicable specifications.

Conveying and Placing Concrete Methods and equipment for transporting, handling, depositing, and consolidating the concrete prior to the first concrete placement.

[Formwork] Formwork design prior to the first concrete placement.

[Forms] [Installation Drawings] SECTION 03 30 53 Page 4

[Concrete Placement] [Ready-Mix Concrete] [Mix Design Data] [Air-Entraining Admixtures] [Fly Ash] [Steel Reinforcement] [Accessories] [Curing Compound] [Measurement of Floor Tolerances] [Concrete] SD-06 Test Reports Aggregates Test reports for aggregates showing the material(s) meets the quality and grading requirements of the specifications.

Concrete Mixture Proportions G The mixture proportions that will produce concrete of the quality required, ten days prior to placement of concrete.

Applicable test reports to verify that the concrete mixture proportions selected will produce concrete of the quality specified.

[Compressive Strength Testing G] [Slump G] SD-07 Certificates Cementitious Materials CPG for recycled materials or appropriate Waiver Form Manufacturer's certificates of compliance, accompanied by mill test reports, attesting that the concrete materials meet the requirements of the specifications in accordance with the Special Clause "CERTIFICATES OF COMPLIANCE". Certificates for all material conforming to EPA's Comprehensive Procurement Guidelines (CPG), in accordance with 40 CFR 247.

Aggregates Certificates of compliance stating that the material(s) meet the quality and grading requirements of the specifications under which it is furnished.

[Bill of Lading G]

1.6 QUALITY ASSURANCE

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

1.6.1 Regulatory Requirements Not Used.

Not Used.

SECTION 03 30 53 Page 5

1.6.2 Flatness and Levelness of Floor Slabs

Conduct floor flatness and levelness test, (FF and FL respectively), on floor slabs in accordance with the provisions set forth in ASTM E 1155M ASTM E 1155. Also Zi calculation to be used shall be N min.=A/10. Floor tolerance measurements shall be made by the approved laboratory and inspection service within 24 hours after completion of final troweling operation and before forms and shores have been removed. Take measurements with a Dipstick Auto-Read floor profiler instrument. Provide results of floor tolerance tests, including formal notice of acceptance or rejection of the work, to the Contractor within 24 hours after data collection.

PART 2 PRODUCTS

2.1 MATERIALS

2.1.1 Cementitious Materials

Provide cementitious materials that conform to the appropriate specifications listed:

2.1.1.1 Portland Cement

ASTM C 150, Type I, IA, II, IIA, III, IIIA or V, low alkali , except that the tricalcium aluminate of the Type III or IIIA cement shall be limited to 5 percent].

2.1.1.2 Blended Hydraulic Cement

Not Used.

2.1.1.3 Pozzolan

Provide pozzolan that conforms to ASTM C 618, Class C or F, including requirements of Tables 1A and 2A.

2.1.2 Aggregates

Fine and coarse aggregates shall be tested and evaluated for alkali-aggregate reactivity in accordance with ASTM C 1260. Perform evaluation of fine and coarse aggregates separately and in combination, matching the proposed mix design proportioning. All results of the separate and combination testing shall have a measured expansion less than

0.10 percent at 16 days after casting. If the test data indicates an expansion of 0.10 percent or greater, reject the aggregate(s) or perform additional testing using ASTM C 1260 and ASTM C 1567. Perform the additional testing using ASTM C 1260 and ASTM C 1567 using the low alkali portland cement in combination with ground granulated blast furnace (GGBF) slag, or Class F fly ash. Use GGBF slag in the range of 40 to 50 percent of the total cementitious material by mass. Use Class F fly ash in the range of 25 to 40 percent of the total cementitious material by mass.

2.1.3 Admixtures

Admixtures to be used, when required or approved, shall comply 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 SECTION 03 30 53 Page 6 of the Contracting Officer and will be rejected if test results are not satisfactory.

2.1.3.1 Air-Entraining Admixture

Provide air-entraining admixture that meets the requirements of ASTM C 260.

2.1.3.2 Accelerating Admixture

Not Used

2.1.3.3 Water-Reducing or Retarding Admixture

Provide water-reducing or retarding admixture meeting the requirements of ASTM C 494/C 494M, Type A, B, or D. High-range water reducing admixture may be used only when approved, approval being contingent upon particular placement requirements as described in the Contractor's Quality Control Plan.

2.1.4 Water

Use fresh, clean, potable water for mixing and curing, free from injurious amounts of oil, acid, salt, or alkali, except that unpotable water may be used if it meets the requirements of COE CRD-C 400.

[2.1.5 Reinforcing Steel Provide reinforcing bars conforming to the requirements of ASTM A 615/A 615M, Grade 60. Welded steel wire fabric shall conform to the requirements of ASTM A 185/A 185M. Details of reinforcement not shown shall be in accordance with ACI MCP SET Part 3, Chapters 7 and 12.

][2.1.6 Expansion Joint Filler Strips, Premolded Expansion joint filler strips, premolded shall be sponge rubber conforming to ASTM D 1752, Type I.

][2.1.7 Joint Sealants - Field Molded Sealants Joint sealants - field molded sealants shall conform to ASTM C 920, Type M, Grade NS, Class 25, use NT for vertical joints and Type M, Grade P, Class 25, use T for horizontal joints. Provide polyethylene tape, coated paper, metal foil, or similar type bond breaker materials. The backup material needs to be compressible, nonshrink, nonreactive with the sealant, and a nonabsorptive material such as extruded butyl or polychloroprene foam rubber. Immediately prior to installation of field-molded sealants, clean the joint of all debris and further cleaned using water, chemical solvents, or other means as recommended by the sealant manufacturer or directed.

][2.1.8 Waterstops Waterstops shall conform to COE CRD-C 572.

][2.1.9 Formwork The design and engineering of the formwork as well as its construction, will be the responsibility of the Contractor.

SECTION 03 30 53 Page 7

][2.1.10 Form Coatings Coat forms, for exposed surfaces, with a nonstaining form oil to be applied shortly before concrete is placed.

][2.1.11 Vapor Barrier Provide polyethylene vapor barrier sheeting with a minimum thickness of 6 mils or other equivalent material having a vapor permeance rating not exceeding 0.5 perms as determined in accordance with ASTM E 96/E 96M.

]2.1.12 Curing Materials Provide curing materials conforming to the following requirements.

2.1.12.1 Impervious Sheet Materials

Impervious sheet materials, ASTM C 171, type optional, except polyethylene film, if used, shall be white opaque.

2.1.12.2 Membrane-Forming Curing Compound

ASTM C 309, Type 1-D or 2, Class A.

2.2 READY-MIX CONCRETE

a. Concrete shall be ready-mix concrete with mix design data conforming to ACI MCP SET Part 2

b. Non-exposed concrete elements: 4,000 psi minimum compressive strength.

c. Direct-exposed concrete elements (including air-conditioned rooms): 4,000 psi minimum compressive strength as determined in 28 calendar days.

d. Slump: 1 to 4 inch according to ASTM C 143/C 143M and ACI MCP SET Part 1.

e. Portland Cement conforming to ASTM C 150.

f. Blended hydraulic cement conforming to ASTM C 595.

g. Use one brand and type of cement for formed concrete having exposed-to-view finished surfaces.

h. Air-Entraining Admixtures conforming to ASTM C 260. Exterior concrete exposed to freezing needs to be air-entrained 5 to 6 percent by volume. Nonair-entrained interior concrete shall have a total air content of 2 to 4 percent by volume.

i. Water-reducing admixtures, retarding admixtures, accelerating admixtures, water-reducing and accelerating admixtures, and water-reducing and retarding admixtures shall conform to

ASTM C 494/C 494M.

j. Fly Ash used as an admixture shall conform to ASTM C 618, Class C or F with 4 percent maximum loss on ignition and 35 percent maximum cement replacement by weight.

SECTION 03 30 53 Page 8

k. Ground granulated blast furnace slag used as an admixture shall conform to ASTM C 989, Grade 120 with between 25 to 50 percent maximum cement replacement by weight.

2.3 STEEL REINFORCEMENT

2.3.1 Deformed Steel Bars

Provide steel bars conforming to ASTM A 615/A 615M, Grade [.60 ksi] ACI MCP SET Parts 2 and 3.

2.3.2 Welded Wire Fabric

Provide welded wire fabric conforming to ASTM A 185/A 185M.

2.4 FORMS

Forms shall be of wood, steel, or other approved material and conform to ACI MCP SET, Parts 2 and 3.

Provide form release conforming to ACI MCP SET, Part 4.

2.5 ACCESSORIES

2.5.1 Waterstops

a. Provide waterstops of the flat dumbbell type not less than 3/16-inch thick for widths up to 5 inches and not less than 3/8-inch thick for widths 5 inches and over.

b. Waterstops shall be made of rubber and conform to ASTM D 1752.

2.5.2 Chemical Floor Hardener

Not Used.

2.5.3 Curing Compound

Provide curing compound conforming to ASTM C 309.

PART 3 EXECUTION

3.1 PREPARATION

3.1.1 General

Prepare construction joints to expose coarse aggregate. The surface shall 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. Earth foundations shall be satisfactorily compacted.

Ensure spare vibrators are available. The entire preparation shall be accepted by the Government prior to placing.

SECTION 03 30 53 Page 9

3.1.2 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 2 inches from concrete surfaces permanently exposed to view or exposed to water on the finished structures. Embedded items shall 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. All equipment needed to place, consolidate, protect, and cure the concrete shall be at the placement site and in good operating condition.

3.1.3 Formwork Installation

Forms shall 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.

3.1.4 Vapor Barrier Installation

Apply vapor barriers over gravel fill. Lap edges not less than 6 inches.

Seal all joints with pressure-sensitive adhesive not less than 2 inches wide. Protect the vapor barrier at all times to prevent injury or displacement prior to and during concrete placement.

3.1.5 Production of Concrete

3.1.5.1 Ready-Mixed Concrete

Provide ready-mixed concrete conforming to ASTM C 94/C 94M except as otherwise specified.

3.1.5.2 Concrete Made by Volumetric Batching and Continuous Mixing Concrete made by volumetric batching and continuous mixing shall conform to

ASTM C 685/C 685M.

[3.1.5.3 Batching and Mixing Equipment The Contractor has the option of using an on-site batching and mixing facility. The facility shall provide sufficient batching and mixing equipment capacity to prevent cold joints. Submit the method of measuring materials, batching operation, and mixer for review.

][3.1.6 Waterstops Install and splice waterstops as directed by the manufacturer.

]3.2 CONVEYING AND PLACING CONCRETE

Perform conveying and placing concrete in conformance with the following requirements.

3.2.1 General

Concrete placement is not permitted when weather conditions prevent proper placement and consolidation without approval. When concrete is mixed and/or transported by a truck mixer, deliver the concrete to the site of SECTION 03 30 53 Page 10 the work completing the discharge within 1-1/2 hours or 45 minutes when the placing temperature is 86 degrees F or greater unless a retarding admixture is used. Convey concrete from the mixer to the forms as rapidly as practicable by methods which prevent segregation or loss of ingredients.

Concrete shall be in place and consolidated within 15 minutes after discharge from the mixer. Deposit concrete as close as possible to its final position in the forms and regulate it so that it may be effectively consolidated in horizontal layers 18 inches or less in thickness with a minimum of lateral movement. Carry on the placement at such a rate that the formation of cold joints will be prevented.

3.2.2 Consolidation

Consolidate each layer of concrete by rodding, spading, or internal vibrating equipment. External vibrating equipment shall not be used.

Systematically accomplish internal vibration by inserting the vibrator through the fresh concrete in the layer below at a uniform spacing over the entire area of placement. The distance between insertions shall be approximately 1.5 times the radius of action of the vibrator and overlay the adjacent, just-vibrated area by approximately 4 inches. Ensure that the vibrator penetrates rapidly to the bottom of the layer and at least 6 inches into the layer below, if such a layer exists. Hold vibrator stationary until the concrete is consolidated and then withdraw it slowly at the rate of about 3 inches per second.

3.2.3 Cold-Weather Requirements

No concrete is to be mixed or placed when the ambient temperature is below 36 degrees F or if the ambient temperature is below 41 degrees F and falling. Provide suitable covering and other means as approved for maintaining the concrete at a temperature of at least 50 degrees F for not less than 72 hours after placing and at a temperature above freezing for the remainder of the curing period. Do not mix salt, chemicals, or other foreign materials with the concrete to prevent freezing. Remove and replace concrete damaged by freezing at the expense of the Contractor.

3.2.4 Hot-Weather Requirements

When the rate of evaporation of surface moisture, as determined by use of Figure 1 of ACI MCP SET Part 2, is expected to exceed 0.2 psf per hour, provisions for windbreaks, shading, fog spraying, or covering with a light-colored material shall be made in advance of placement, and such protective measures taken as quickly as finishing operations will allow.

3.2.5 Lifts in Concrete

Deposit concrete in horizontal layers not to exceed 24 inches in thickness. Carry on placement at a rate that prevents the formation of cold joints. Place slabs in one lift.

[3.3 FORM REMOVAL

Do not remove forms before 24 hours after concrete placement, except as otherwise specifically authorized. Do not remove supporting forms and shoring until the concrete has cured for at least 5 days. When conditions require longer curing periods, forms shall remain in place.

SECTION 03 30 53 Page 11

]3.4 FINISHING

3.4.1 General

Do not finish or repair concrete when either the concrete or the ambient temperature is below 50 degrees F.

3.4.2 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. Surface defects greater than 1/2 inch in diameter and holes left by removal of tie rods in all surfaces not to receive additional concrete shall be reamed or chipped and filled 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. The cement used in mortar or concrete for repairs to all surfaces permanently exposed to view shall be a blend of portland cement and white cement so that the final color when cured is the same as adjacent concrete.

3.4.3 Finishing Unformed Surfaces

Float finish all unformed surfaces, that are not to be covered by additional concrete or backfill, to elevations shown, unless otherwise specified. Surfaces to receive additional concrete or backfill shall be brought to the elevations shown and left as a true and regular surface.

Slope exterior surfaces for drainage unless otherwise shown. Carefully make joints with a jointing tool. Finish unformed surfaces to a tolerance of 3/8 inch for a float finish and 5/16 inch for a trowel finish as determined by a 10 foot straightedge placed on surfaces shown on the drawings to be level or having a constant slope. Do not perform finishing while there is excess moisture or bleeding water on the surface. No water or cement is to be added to the surface during finishing.

3.4.3.1 Float Finish

Provide float finished surfaces, screeded and darbied or bullfloated to eliminate the ridges and to fill in the voids left by the screed. In addition, the darby or bullfloat shall fill all surface voids and only slightly embed the coarse aggregate below the surface of the fresh concrete. When the water sheen disappears and the concrete supports a person's weight without deep imprint, complete floating. Floating shall embed large aggregates just beneath the surface, remove slight imperfections, humps, and voids to produce a plane surface, compact the concrete, and consolidate mortar at the surface.

3.4.3.2 Trowel Finish

Trowelling shall be done immediately following floating to provide a smooth, even, dense finish free from blemishes including trowel marks.

Protect finished surfaces from damage during the construction period.

3.4.3.3 Flat Floor Finishes

In accordance with ACI MCP SET Part 2, construct in accordance with one of the methods recommended in Table 7.15.3, "Typical Composite FF/FL Values for Various Construction Methods." ACI MCP SET Part 1 for tolerances tested by ASTM E 1155M or ASTM E 1155. These requirements are based upon SECTION 03 30 53 Page 12 the latest FF/FL method. Floor slabs shall conform to the following ACI F-number requirements unless noted otherwise:

a. Slab on Grade:

Specified Overall Values - FF30/FL23 minimum Minimum Local Values - FF17/FL15 minimum

b. Level Suspended Slabs Shored Until After Testing:

Specified Overall Values - FF25/FL20 minimum Minimum Local Values - FF17/FL15 minimum

c. Unlevel Shored Suspended Slabs and Unshored Suspended Slabs:

Specified Overall Values - FF25 Minimum Local Values - FL17 Floor slabs subject to vehicular traffic or receiving thin-set flooring shall conform to the following ACI F-number requirements:

a. Slab on Grade:

Specified Overall Values - FF35/FL25 minimum Minimum Local Values - FF25/FL17 minimum

b. Level Suspended Slabs Shored Until After Testing:

Specified Overall Values - FF30/FL20 minimum Minimum Local Values - FF25/FL15 minimum

c. Unlevel Shored Suspended Slabs and Unshored Suspended Slabs:

Specified Overall Values - FF30 Minimum Local Values - FL25

3.4.3.4 Measurement of Floor Tolerances

Test floor slabs within 24 hours of the final troweling. Provide tests to Contracting Officer within 12 hours after collecting data. Floor flatness inspector shall provide a tolerance report which includes:

a. Name of Project

b. Name of Contractor

c. Date of Data Collection

d. Date of Tolerance Report

e. A Key Plan Showing Location of Data Collected

f. Results Required by ASTM E 1155M ASTM E 1155

3.4.3.5 Broom Finish

Screed and float the concrete to required finish plane with no coarse aggregate visible. After surface moisture disappears, broom or brush the surface with a broom or fiber bristle brush in a direction transverse to SECTION 03 30 53 Page 13 that of the main traffic or as directed.

3.4.3.6 Expansion and Contraction Joints

Make expansion and contraction joints in accordance with the details shown or as otherwise specified. Provide 1/2 inch thick transverse expansion joints where new work abuts an existing concrete. Provide expansion joints at a maximum spacing of 30 feet on center in sidewalks and slabs, unless otherwise indicated. Provide contraction joints at a maximum spacing of 5 linear feet in sidewalks and slabs, unless otherwise indicated. Cut contraction joints at a minimum of 1 inch(es) deep with a jointing tool after the surface has been finished.]

3.5 CURING AND PROTECTION

Beginning immediately after placement, and continuing for at least 7 days, except for concrete made with Type III cement, at least 3 days, cure and protect all concrete from premature drying, extremes in temperature, rapid temperature change, freezing, mechanical damage, and exposure to rain or flowing water. Provide all materials and equipment needed for adequate curing and protection at the site of the placement prior to the start of concrete placement. Accomplish moisture preservation of moisture for concrete surfaces not in contact with forms by one of the following methods:

a. Continuous sprinkling or ponding.

b. Application of absorptive mats or fabrics kept continuously wet.

c. Application of sand kept continuously wet.

d. Application of impervious sheet material conforming to ASTM C 171.

e. Application of membrane-forming curing compound conforming to ASTM C 309, Type 1-D, on surfaces permanently exposed to view.

Accomplish Type 2 on other surfaces in accordance with manufacturer's instructions.

Accomplish the preservation of moisture for concrete surfaces placed against wooden forms by keeping the forms continuously wet for 7 days , except for concrete made with Type III cement, for 3 days. If forms are removed prior to end of the required curing period, use other curing methods for the balance of the curing period. Do not perform protection removal if the temperature of the air in contact with the cocrete may drop more than 60 degrees F within a 24 hour period.

3.6 TESTS AND INSPECTIONS

3.6.1 General

The individuals who sample and test concrete, as required in this specification, 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.

3.6.2 Inspection Details and Frequency of Testing

3.6.2.1 Preparations for Placing

Inspect foundation or construction joints, forms, and embedded items in SECTION 03 30 53 Page 14 sufficient time prior to each concrete placement by the Contractor to certify that it is ready to receive concrete.

3.6.2.2 Air Content

Check air content at least once during each shift that concrete is placed .

Obtain samples in accordance with ASTM C 172 and tested in accordance with

ASTM C 231.

3.6.2.3 Slump

Check slump twice during each shift that concrete is produced . Obtain samples in accordance with ASTM C 172 and tested in accordance with

ASTM C 143/C 143M.

3.6.2.4 Consolidation and Protection

Ensure that the concrete is properly consolidated, finished, protected, and cured.

3.6.3 Action Required

3.6.3.1 Placing

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

3.6.3.2 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.

3.6.3.3 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. The adjustments are to be made so that the water-cement ratio does not exceed that specified in the submitted concrete mixture proportion.

3.6.4 Reports

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 3 days after the end of each weekly reporting period. See Section 01 45 01 USACE QUALITY CONTROL.

3.7 FORM WORK

Form work shall conform to ACI MCP SET Parts 2 through 5.

3.7.1 Preparation of Form Surfaces

Forms shall be true to line and grade, mortar-tight, and sufficiently rigid to prevent objectionable deformation under load. Form surfaces for permanently exposed faces shall be smooth, free from irregularities, dents, SECTION 03 30 53 Page 15 sags, or holes. Chamfer exposed joints and exposed edges. Arrange internal ties so that when the forms are removed, the form ties are not less than 2 inches from concrete surfaces permanently exposed to view or exposed to water on the finished structure.

3.7.2 Form Coating

Coat forms, for exposed surfaces, with a nonstaining form release coating applied shortly before concrete is placed and before the steel case is added to avoid contaminating the reinforcing steel. Forms for unexposed surfaces may be wetted in lieu of coating immediately before the placing of concrete, except that in freezing weather form release coating shall be used.

3.7.3 Removal of Forms

Remove forms carefully to prevent damage to the concrete. Do not remove forms before the expiration of the minimum time indicated below:

Arches, beams and deck-type slabs 144 hours Columns and walls (lifts 15 feet and under) 24 hours Columns and walls (lifts over 15 feet) 48 hours

3.8 STEEL REINFORCING

3.8.1 General

Reinforcement shall 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.

3.8.2 Fabrication

Shop fabricate steel reinforcement in accordance with ACI MCP SET Parts 2 and 3. Shop details and bending shall be in accordance with ACI MCP SET Parts 2 and 3.

3.8.3 Splicing

Perform splices in accordance with ACI MCP SET Parts 2 and 3.

3.8.4 Supports

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

3.9 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.

3.10 BILL OF LADING

Bill of Lading for each ready-mix concrete delivery shall be in accordance with ASTM C 94/C 94M.

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3.11 CHEMICAL-HARDENER TREATMENT

Apply Liquid-Chemical Floor Hardener where indicated, after curing and drying concrete surface. Dilute liquid hardener with water and apply in three coats. First coat shall be one-third strength, second coat one-half strength, and third coat two-thirds strength. Apply each coat evenly and allow it to dry 24 hours before applying next coat. Apply proprietary chemical hardeners in accordance with manufacturer's printed directions.

3.12 FIELD TESTING

a. Provide samples and test concrete for quality control during placement. Sampling of fresh concrete for testing shall be in accordance with ASTM C 172.

b. Test concrete for compressive strength at 7 and 28 days for each design mix. Concrete test specimens shall conform to ASTM C 31/C 31M.

Perform Compressive strength testing conforming to ASTM C 39/C 39M.

c. Test Slump at thesite of discharge for each design mix in accordance with ASTM C 143/C 143M.

d. Test air content for air-entrained concrete in accordance with ASTM C 231. Test concrete using lightweight or test extremely porous aggegates in accordance with ASTM C 173/C 173M.

e. Determine temperature of concrete at time of placement in accordance with ASTM C 1064/C 1064M.

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