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HomeMy WebLinkAbout32-1313-Portland-Cement-Concrete-Pavement_Rev_1Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 1 of 15 SECTION 32 1313 Site Concrete PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section. 1.2 WORK INCLUDED A. The work includes furnishing all labor, materials, equipment, and supervision to construct the Portland cement concrete paving and integral curb work, including aggregate base course, detectable/tactile warning surface tile, and handicap ramps, in accordance with the Drawings and Specifications. 1.3 RELATED WORK A. Examine Contract Documents for requirements that affect work of this Section. Other Specification Sections that directly relate to work of this Section include, but are not limited to: 1. Section 31 0000, EARTH MOVING 2. Section 32 1216 ASPHALT PAVING 3. Section 32 1614, PRECAST CONCRETE CURBING 4. Section 32 1640, GRANITE CURB. 5. Section 03 3000, CAST-IN-PLACE CONCRETE 6. Section 32 1726, TACTILE WARNING SURFACES 6. Provision of Waste Management: Section 01 7419, Construction Waste Management Plan. 7. Provision of general LEED requirements and forms: Section 01 8113 Sustainable Design Requirements. 1.4 REFERENCES A. Comply with applicable requirements of the following standards. Where these standards conflict with other specified requirements, the most restrictive requirements shall govern. 1. American Concrete Institute (ACI): 305R Hot Weather Concreting 306R Cold Weather Concreting 325.9R Guide for Construction of Concrete Pavements and Concrete Bases. 2. American Society for Testing and Materials (ASTM): A 185 Welded Steel Wire Fabric for Concrete Reinforcement C 33 Concrete Aggregates C 94 Ready-Mixed Concrete C 143 Slump of Portland Cement Concrete C 150 Portland Cement C 171 Sheet Materials for Curing Concrete C 231 Air Content of Freshly Mixed Concrete by the Pressure Method C 309 Liquid Membrane-Forming Compounds for Curing Concrete C 494 Chemical Admixtures for Concrete C 920 Elastomeric Joint Sealants Portland Cement Concrete Pavement Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 2 of 15 C 962 Guide for Use of Elastomeric Joint Sealants D 226 Asphalt-Saturated Organic Roofing Felt for Use in Membrane Waterproofing and Built-Up Roofing D 1557 Moisture - Density Relations of Soils and Soil Aggregate Mixtures Using 10(4.54-kg) Rammer and 18 in. (457 mm) Drop D 1752 Preformed Sponge Rubber and Cork Expansion Joint Fillers for Concrete Paving and Structural Construction 3. Americans with Disabilities Act (ADA): Appendix to Part 1191 Accessibility Guidelines for Buildings and Facilities. 4. Commonwealth of Massachusetts Highway Department (MHD): Specifications Standard Specifications for Highways and Bridges. 1.5 QUALITY ASSURANCE A. Manufacturer Qualifications: Manufacturer of ready-mixed concrete products who complies with ASTM C 94/C 94M requirements for production facilities and equipment. 1. Manufacturer certified according to NRMCA's "Certification of Ready Mixed Concrete Production Facilities." B. ACI Publications: Unless otherwise specified, work and materials for construction of the Portland cement concrete paving shall conform to ACI 325.9R. C. Concrete Testing Service: Engage a qualified independent testing agency to perform material evaluation tests and to design concrete mixtures. D. Preinstallation Conference: Conduct conference at Project site to comply with requirements in Division 1. 1. Before submitting design mixtures, review concrete pavement mixture design and examine procedures for ensuring quality of concrete materials and concrete pavement construction practices. Require representatives, including the following, of each entity directly concerned with concrete pavement, to attend conference: a. Contractor's superintendent. b. Independent testing agency responsible for concrete design mixtures. c. Ready-mix concrete producer. E. Work, materials, and color of the handicap ramp paving shall conform to applicable sections of Americans with Disabilities Act (ADA) Accessibility Guidelines for Buildings and Facilities. F. Paving work, base course etc., shall be done only after excavation and construction work which might damage them have been completed. Damage caused during construction shall be repaired before acceptance. G. Existing paved areas shall, if damaged or removed during course of this project, be repaired or replaced under this section of the specification. Workmanship and materials for such repair and replacement, except as otherwise noted, shall match as closely as possible those employed in existing work. H. Pavement, base, or sub-base shall not be placed on a muddy or frozen subgrade. 1.6 PROJECT CONDITIONS Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 3 of 15 A. Traffic Control: Maintain access for vehicular and pedestrian traffic for other construction activities. 1.7 PRECONSTRUCTION MOCK-UP PANELS A. General 1. Schedule mock-up casting for acceptance 30 days prior to casting of concrete surfaces represented by the mockups. 2. Locate mock-up panels in non-public areas accepted by the Architect. 3. Continue to cast mock-ups until acceptable mock-ups area produced. Accepted mock-ups shall be the standard for color, texture, and workmanship for the work. 4. Mock-up sequence of forming, placing, form removal, curing, and finishing shall be reviewed and accepted by the Architect. 5. Mock-up formwork shall be inspected and accepted by the Architect before placing of concrete. 6. Use the same concrete mixes and placement procedures, accepted in mock-ups, in the final work, unless otherwise directed by the Architect. 7. Protect accepted mock-ups from damage until completion and acceptance of the work represented by the mock-up. B. Remove mock-up panels from site at completion of project, as directed by the Architect. C. Construct mock-up panels or areas as indicated to demonstrate the ability to cast concrete for concrete paving to achieve shape, color, jointing and textured finish required. Mock-ups shall include or meet the following requirements: 1. Provide mock-up panel 5 ft. x 10 ft. size, full depth. 2. Provide mock-ups simulating actual design and execution conditions for concrete mix materials, reinforcement, formwork, placing sequence, form removal, curing, finishing, and methods and materials of stain removal and correction of defective work. 3. On mock-ups where directed by the Architect, provide minimum of three variation of mix color to be used in the repair of defective work, in order to determine acceptable color and texture match. 4. Demonstrate in the construction of the mock-up formwork the sealer material, form release agent, and curing materials and methods to be used. 5. Include control joints and expansion joints with joint sealer. D. Source of Materials. Utilize the same source, stock, or brand of concrete materials for each class or mix of concrete which is to be exposed. Do not interchange materials or mixes until an additional mock-up shows that uniformity in finish texture and color, as compared to original mock-up will be maintained. If necessary, obtain and stockpile materials in sufficient quantity to ensure continuity and uniformity. 1.8 SUBMITTALS A. LEED Submittals: Provide validation for each LEED Focus Material (LFM) according to the Action Submittals requirements of Section 01 8113 “Sustainable Design Requirements” including a completed line item on the LEED Reporting Form for each LEED Focus Material. Validation includes at a minimum: Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 4 of 15 1. Recycled Content. 2. Regional Materials. 3. Solar Reflectance Index (SRI). B. Description of Methods and Sequence of Placement. For each type of specially-finished concrete provide description of methods and sequence of placement. C. Submit manufacturer's product data for the following: 1. Form release agent. 2. Preformed joint filler. D. Submit samples of the following: 1. Preformed joint filler. E. Design Mixtures: For each concrete pavement mixture. Include alternate mixture designs when characteristics of materials, Project conditions, weather, test results, or other circumstances warrant adjustments. F. Material Certificates: Signed by manufacturers certifying that each of the following materials complies with requirements: 1. Cementitious materials. 2. Steel reinforcement and reinforcement accessories. 3. Admixtures. 4. Curing compounds. 5. Bonding agent or epoxy adhesive. G. Minutes of preinstallation conference. 1.9 TESTING AND INSPECTION A. Contractor shall provide a minimum of four test results indicating compliance with minimum compressive strength requirements of fully cured concrete pavement B. The Owner reserves the right to inspect and test paving and associated work in accordance with Division 01, GENERAL REQUIREMENTS. 1.10 LEED FOCUS MATERIALS A. Cast-in-place paving and curbs. B. Pre-cast pavers and curbs. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 5 of 15 PART 2 - PRODUCTS 2.1 AGGREGATE BASE COURSE A. Material for aggregate base course shall be crushed stone, as specified in Section 31 1000, EARTH MOVING 2.2 PORTLAND CEMENT CONCRETE A. Portland cement concrete for pavements and exterior slabs shall be air-entrained type with a maximum water-cement ratio of 0.50 conforming to ACI 325.9R. Minimum compressive strengths at 28 days shall be 4,000 psi. 1. Concrete shall be air-entrained type, conforming to ASTM C 94. Air content by volume shall be 6% + 1%, and shall be tested in accordance with ASTM C 231. 2. Concrete slump shall be no less than 2 in. nor greater than 4 in., determined in accordance with ASTM C 143. 3. Cement shall be Portland cement, conforming to ASTM C 150, Type I or II. Only one color of cement, all of the same manufacturer, shall be used for the work. Type III cement shall be used only with the prior approval of the Architect. 4. Fine and coarse aggregates shall conform to ASTM C 33. 5. Concrete shall contain a water reducing agent to minimize cement and water content of the concrete mix at the specified slump. Water reducing agent shall conform to ASTM C 494. 6. No calcium chloride or admixtures containing calcium chloride shall be added to the concrete. No admixtures other than those specified shall be used in the concrete without the specific written permission of the Architect in each case. 2.3 COLOR ADDITIVES A. Type: 1. Concentrated pigments specially processed for mixing into concrete and complying with ASTM C979. 2. Color additives containing carbon black are not acceptable. 3. Middle range priced colored concrete, color TBD. B. Color Additive Delivery: 1. Automated Dispensing: Meter and dispense colors using computer-controlled automated color weighing and dispensing system. 2. Manual Dispensing: Use powdered color additives in pre-measured disintegrating bags. 2.4 CHEMICAL ADMIXTURES A. Chemical Admixtures: Provide admixtures certified by manufacturer to be compatible with other admixtures and to contain not more than 0.1 percent water-soluble chloride ions by mass of cementitious material. 1. Water-Reducing Admixture: ASTM C 494/C 494M, Type A. 2. Retarding Admixture: ASTM C 494/C 494M, Type B. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 6 of 15 2.5 CURING MATERIALS FOR UNCOLORED CONCRETE A. Curing shall be by moist curing or by use of curing compound. B. Curing paper shall be a non-staining, fiber reinforced laminated kraft bituminous product conforming to ASTM C 171. Four mil polyethylene sheeting may be substituted for curing paper. C. Water: Potable. D. Curing compound shall be a clear compound conforming to ASTM C 309, Type 1 or white pigmented compound conforming to ASTM C 309 Type 2, Class B. 2.6 EXPANSION JOINTS A. Unless otherwise indicated on the Drawings, expansion joints shall be located 30 ft. o.c., maximum. B. Expansion joint filler shall be preformed, non-bituminous type joint filler conforming to ASTM D 1752, Type II, similar to Sealtight Cork Expansion Joint Filler, manufactured by W.R. Meadows, Inc., Elgin, IL 60120, or approved equal. C. Dowels shall be furnished under this Section, and shall be Type 304 stainless steel. 2.7 SUSTAINABILITY CHARACTERISTICS A. Recycled Content defined in Section 01 8113 “Sustainable Design Requirements”. Report Recycled Contents only. No minimum requirement. B. Paving products: minimum SRI 15. C. Regional Content defined in Section 01 8113 “Sustainable Design Requirements”. Report Regional Content only. No minimum requirement. 2.8 CONTROL JOINTS A. Control joints indicated on the Drawings to be sawn, shall be made by saw cutting concrete slab after concrete is finished and when the surface is stiff enough to support the weight of workmen without damage to the slab. Saw blade shall cut into slab at least 1 in., but in no case less than 25% of slab depth. B. Unless otherwise indicated on the Drawings, control joints shall be randomly located as indicated on the Drawings. 2.9 CONSTRUCTION JOINTS A. Transverse construction joints shall be placed whenever placing of concrete is suspended for more than 30 minutes. 1. Butt joint with dowels or thickened edge joint shall be used if construction joints occurs at location of control joint. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 7 of 15 2. Keyed joints with tiebars shall be used if the joint occurs at any other location. 2.10 GROUT A. Grout shall be mixed in the proportions of one part Portland cement to two parts sand, by volume. Only sufficient water shall be used to enable grout to barely hold its shape when squeezed into a ball in the hand. Sand for grout shall be "Fine Aggregate", conforming to ASTM C 33. B. Non-shrink grout shall be pre-mixed non-shrinking, high strength grout. Compressive strength in 28 days shall be 5,000 psi minimum, but in no case less than the specified strength of the adjacent concrete. Manufacturer shall provide evidence that the material meets the requirements of the COE CRD-C 621 (558). Grout permanently exposed to view shall be non- oxidizing; metallic grout may be used in other locations. 1. Non-shrink grout shall be one of the following, or approved equal: Manufacturer Product Gifford-Hill Co. Supreme Master Builders Co. Embeco U.S. Grout Corporation Five Star Grout 2.11 BOND BREAKER A. Bond breaker shall be asphalt felt conforming to ASTM D 226, Type I or 6 mil. polyethylene sheeting. 2.12 CONCRETE SEALER A. Concrete flatwork shall be surface coated with a non-yellowing, non-staining or discoloring silane or siloxane-based sealer designated for finish concrete surfaces. The product must demonstrate the ability to reduce water and salt intrusion or absorption reduction by at least 80%, be VOC compliant, be designed to absorb into the concrete surface, and included on the MassDOT approved materials list for this type of sealing application. Note: Paraffin based coatings or latex based surface coatings or curing agents shall not be used or approved for this application. B. Contractor shall use the same manufacturer for the curing compound, retarder, and sealer. 2.13 JOINTS AND SEALANTS A. Joint Material: Preformed polyethylene foam expansion joint material. Joint material shall be flexible, lightweight, non-staining, polyethylene, closed-cell joint filler. Joint material shall come pre-scored with a removable strip. B. Sealant: Sealant shall be a single component, Type HL1, self-leveling, premium-grade polyurethane sealant. Color shall be approved by the Landscape Architect. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 8 of 15 PART 3 - EXECUTION 3.1 GRADING A. Areas to be paved will be compacted and brought approximately to subgrade elevation under Section 31 1000, EARTH MOVING before work of this section is performed. Final fine grading, filling, and compaction of subgrade to receive paving, to form a firm, uniform, accurate, and unyielding subgrade at required elevations and to required lines, shall be done under this Section. B. Existing subgrade material which will not readily compact shall be removed and replaced with satisfactory materials. Additional materials needed to bring subgrade to required line and grade and to replace unsuitable material removed shall be material conforming to Section 31 1000, EARTH MOVING C. Subgrade of areas to be paved shall be recompacted to bring top 8 in. of material immediately below aggregate base course to a compaction of at least 90% of maximum density, as determined by ASTM D 1557, Method D. Subgrade compaction shall extend for a distance of at least 1 ft. beyond pavement edge. D. Excavation required in pavement subgrade shall be completed before fine grading and final compaction of subgrade are performed. Where excavation must be performed in completed subgrade or sub-base subsequent backfill and compaction shall be performed as directed by the Architect as specified in Section 31 1000, EARTH MOVING. Completed subgrade after filling such areas shall be uniformly and properly graded. E. Areas being graded or compacted shall be kept shaped and drained during construction. Ruts greater than or equal to 2 in. deep in subgrade, shall be graded out, reshaped, and recompacted before placing pavement. F. Materials shall not be stored or stockpiled on subgrade. G. Disposal of debris and other material excavated and/or stripped under this section, and material unsuitable for or in excess of requirements for completing work of this Section shall conform to the following: 1. Material shall be legally disposed of off-site. H. Prepared subgrade will be inspected and tested by an independent testing agency, provided and paid for by the Contractor, prior to installation of paving base course. Disturbance to subgrade caused by inspection procedures shall be repaired under this Section of the specification. 1. Contractor shall submit a minimum of six Proctor compaction test results indicating conformance to compaction density requirements specified herein. 3.2 AGGREGATE BASE COURSE A. Aggregate base course for paving and the spreading, grading, and compaction methods employed shall conform to Section 31 1000, EARTH MOVING. B. Subgrade and base course shall be kept clean and uncontaminated. Less select materials shall not be permitted to become mixed with gravel. Materials spilled outside pavement lines shall be removed and area repaired. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 9 of 15 C. Portions of subgrade or of construction above which become contaminated, softened, or dislodged by passing of traffic, or otherwise damaged, shall be cleaned, replaced, and otherwise repaired to conform to the requirements of Section 31 1000, EARTH MOVING before proceeding with next operation. 3.3 STEEL REINFORCEMENT A. General: Comply with CRSI's "Manual of Standard Practice" for fabricating, placing, and supporting reinforcement. B. Before being placed in position, reinforcing for reinforced concrete shall be thoroughly cleaned of loose mill and rust scale, dirt, ice, and other foreign material which may reduce the bond between the concrete and reinforcing. Where there is delay in placing concrete after reinforcement is in place, bars shall be reinspected and cleaned when necessary. C. Any bar showing cracks after bending shall be discarded. D. Unless otherwise indicated on the Drawings, reinforcing shall extend within 2 in. of formwork and expansion joints. Reinforcing shall continue through control joints. Adjacent sheets of fabric reinforcing shall lap 6 in. E. After forms have been coated with form release agent, but before concrete is placed, reinforcing steel anchors shall be securely wired in the exact position called for, and shall be maintained in that position until concrete is placed and compacted. Chair bars and supports shall be provided in a number and arrangement satisfactory to the Architect. F. Install welded wire reinforcement in lengths as long as practicable. Lap adjoining pieces at least one full mesh, and lace splices with wire. Offset laps of adjoining widths to prevent continuous laps in either direction. 3.4 PORTLAND CEMENT CONCRETE PAVING A. Paving mix, equipment, methods of mixing and placing, and precautions to be observed as to weather, condition of base etc., shall meet the requirements of ACI 325.9R. Pavement shall be constructed in accordance with the Drawings. B. The Architect shall be notified of concrete placement sufficiently in advance of start of operation to allow his representative to complete preliminary inspection of the work, including subgrade, forms, and reinforcing steel, if used. C. Normal concrete placement procedures shall be followed. Concrete shall arrive at the jobsite so that no additional water will be required to produce the desired slump. When conditions develop that required addition of water to produce the desired slump, permission of the Architect must be obtained. The concrete shall be transported from the mixer to its place of deposit by a method that will prevent segregation or loss of material. D. Work shall not be performed during rainy weather or when temperature is less than 40o F. (4.4o C). E. Adjacent work, etc., shall be protected from stain and damage during entire operation. Damaged and stained areas shall be replaced or repaired to equal their original conditions. F. Existing concrete, earth, and other water-permeable material against which new concrete is to Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 10 of 15 be placed shall thoroughly damp when concrete is placed. There shall be no free water on surface. G. Concrete which has set or partially set before placing shall not be employed. Retempering of concrete will not be permitted. H. Concrete shall be thoroughly spaded and tamped to secure a solid and homogeneous mass, thoroughly worked around reinforcement and into corners of forms. I. When joining fresh concrete to concrete which has attained full set, latter shall be cleaned of foreign matter, and mortar scum and laitance shall be removed by chipping and washing. Clean, roughened base surface shall be saturated with water, but shall have no free water on surface. A coat of 1:1 cement-sand grout, approximately 1/8 in. thick, shall be well scrubbed into thoroughly dampened concrete base. New concrete shall be placed immediately, before grout has dried or set. 3.5 FINISHING A. Concrete flatwork surfaces shall be screeded off, bullfloated, troweled and finished true to line and grade, and free of hollows and bumps. Surface shall be dense, smooth, and at exact level and slope required. 1. Finished concrete surface for exposed concrete walks, ramps and pads shall be wood- floated and steel troweled to a smooth surface. Surface shall not deviate more than 1/8 in. in 10 ft. B. Unless otherwise indicated, horizontal surfaces of concrete surfaces which will be exposed shall be given a light broomed finish, with direction of grooves in concrete surface perpendicular to direction of travel. After concrete has set sufficiently to prevent coarse aggregate from being torn from surface, but before it has completely set, brooms shall be drawn across it to produce a pattern of small parallel grooves. Broomed surface shall be uniform, with no smooth, unduly rough or porous spots, or other irregularities. Coarse aggregate shall not be dislodged by brooming operation. C. Immediately following finishing operations, arrises at edges and both sides of expansion joints shall be rounded to a 1/4 in. radius. D. Where finishing is performed before end of curing period, concrete shall not be permitted to dry out, and shall be kept continuously moist from time of placing until end of curing period, or until curing membrane is applied. 3.6 FINISHING FOR REDUCING HEAT ISLAND EFFECT A. Finish shall have a solar reflectance index (SRI) of at least 29 when tested in accordance with ASTM E 1980, and an emittance value (emissivity) of 0.90. B. Concrete flatwork surfaces shall be screeded off, bullfloated, troweled and finished true to line and grade, and free of hollows and bumps. Surface shall be dense, smooth, and at exact level and slope required. 1. Finished concrete surface for exposed concrete pavement shall be wood-floated and steel troweled to a smooth surface. Surface shall not deviate more than 1/8 in. in 10 ft. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 11 of 15 C. Coarse aggregate shall not be dislodged by finishing operations. D. Immediately following finishing operations, arrises at edges and both sides of expansion joints shall be rounded to a 1/4 in. radius. Control joints to be tooled shall be scored into slab surface with scoring tool. Adjacent edges of control joint shall at same time be finished to a 1/4 in. radius. E. Where finishing is performed before end of curing period, concrete shall not be permitted to dry out, and shall be kept continuously moist from time of placing until end of curing period, or until curing membrane is applied. 3.7 CURING A. It is essential that concrete be kept continuously damp from time of placement until end of specified curing period. It is equally essential that water not be added to surface during floating and troweling operations, and not earlier than 24 hours after concrete placement. Between finishing operations surface shall be protected from rapid drying by a covering of waterproofing paper. Surface shall be damp when the covering is placed over it, and shall be kept damp by means of a fog spray of water, applied as often as necessary to prevent drying, but not sooner than 24 hours after placing concrete. None of the water so applied shall be troweled or floated into surface. B. Concrete surfaces shall be cured by completely covering with curing paper or application of a curing compound. 1. Concrete cured using waterproof paper shall be completely covered with paper with seams lapped and sealed with tape. Concrete surface shall not be allowed to become moistened between 24 and 36 hours after placing concrete. During curing period surface shall be checked frequently, and sprayed with water as often as necessary to prevent drying, but not earlier than 24 hours after placing concrete. 2. If concrete is cured with a curing compound, compound shall be applied at a rate of 200 sq. ft. per gallon, in two applications perpendicular to each other. 3. Curing period shall be seven days minimum. 3.8 DETECTABLE WARNING SURFACE A. Detectable Warning Tiles: Pour and float concrete, set tile by tamping down into concrete until all air voids are removed, edge around the perimeter, cut off protective plastic sheet, in strict accordance with manufacturer’s printed instructions. 3.9 CONSTRUCTION JOINTS A. Construction Joints: Set construction joints at side and end terminations of pavement and at locations where pavement operations are stopped for more than one-half hour unless pavement terminates at isolation joints. 1. Continue steel reinforcement across construction joints, unless otherwise indicated. Do not continue reinforcement through sides of pavement strips, unless otherwise indicated. 2. Provide tie bars at sides of pavement strips where indicated. 3. Butt Joints: Use epoxy bonding adhesive at joint locations where fresh concrete is placed against hardened or partially hardened concrete surfaces. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 12 of 15 3.10 EXPANSION JOINTS A. Expansion joints (isolation joints) shall be 1/2 in. wide and unless otherwise indicated on the Drawings, shall be located 30 ft. o.c. and at places where pavement meets other structures. Expansion joint shall be formed in the concrete to required width with preformed joint filler in place. Joint filler shall extend the full width and depth of the slab. Joint filler shall extend the full length of the expansion joint. 1. Depth of joint filler shall form a 1-1/4 in. deep sealant and backer rod recess below finished concrete surface. 2. Doweled Joints: Install sleeves and dowel bars at expansion joints as indicated. Lubricate or asphalt-coat one-half of dowel length to prevent concrete bonding to one side of joint. 3.11 CONTROL JOINTS A. Control joints indicated to be sawn shall be sawn by using a diamond blade soff-type early entry cut saw. Joint shall be made after concrete is finished and when the surface is stiff enough to support the weight of workmen without damage to the slab. Saw shall cut into slab at least 1 in., but in no case less than 25% of slab depth. 3.12 COLD WEATHER CONCRETING A. Materials for concrete shall be heated when concrete is mixed, placed, or cured when the mean daily temperature is below 40oF. or is expected to fall to below 40oF within 72 hours, and the concrete after placing shall be protected by covering, heat, or both. B. Details of handling and protecting of concrete during freezing weather shall be subject to the approval and direction of the Architect. Procedures shall be in accordance with provisions of ACI 306R. 3.13 HOT WEATHER CONCRETING A. Concrete just placed shall be protected from the direct rays of the sun and the forms and reinforcement just prior to placing shall be sprinkled with cold water. Every effort shall be made to minimize delays which will result in excessive mixing of the concrete after arrival on the job. B. During periods of excessively hot weather (95oF., or above), ingredients in the concrete shall be cooled insofar as possible and cold mixing water shall be used to maintain the temperature of the concrete at permissible levels all in accordance with the provisions of ACI 305. Any concrete with a temperature above 95oF, when ready for placement will not be acceptable, and will be rejected. C. Temperature records shall be maintained throughout the period of hot weather giving air temperature, general weather conditions (calm, windy, clear, cloudy, etc.) and relative humidity. Records shall include checks on temperature of concrete as delivered and after placing in forms. Data should be correlated with the progress of the work so that conditions surrounding the construction of any part of the structure can be ascertained. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 13 of 15 3.14 CONCRETE PROTECTION, CURING AND SEALING A. General: Protect freshly placed concrete from premature drying and excessive cold or hot temperatures. Comply with the recommendations of ACI 306R for cold weather protection and ACI 305R for hot weather protection during curing. B. Evaporation Control: In hot, dry, and windy weather, protect concrete from rapid moisture loss before and during finishing operations with an evaporation control material. Apply according to manufacturer's instructions after screeding and bull floating, but before floating. C. Begin curing after finishing concrete but not before free water has disappeared from concrete surface. D. Curing Methods: Cure concrete by moisture curing, moisture-retaining-cover curing, curing compound, or a combination of these as follows: 1. Moisture Curing: Keep surfaces continuously moist for not less than 7 days with the following materials: a. Water. b. Continuous water-fog spray. c. Absorptive cover, water saturated, and kept continuously wet. Cover concrete surfaces and edges with a 12-inch lap over adjacent absorptive covers. 2. Moisture-Retaining-Cover Curing: Cover concrete surfaces with moisture-retaining cover for curing concrete, placed in widest practicable width, with sides and ends lapped at least 12 inches, and sealed by waterproof tape or adhesive. Immediately repair any holes or tears during curing period using cover material and waterproof tape. 3. Curing Compound: Apply uniformly in continuous operation by power spray or roller according to manufacturer's directions. Recoat areas subjected to heavy rainfall within 3 hours after initial application. Maintain continuity of coating and repair damage during curing period. E. Sealer: Apply uniformly in 2 coats in continuous operations according to manufacturer’s written instructions. Allow first coat to dry before applying second coat. 1. Begin sealing dry surface no sooner than 14 days after concrete placement. 2. Six (6) months after initial sealing, the Contractor shall clean and reseal all exposed seashell surfaces according to this specification. 3.15 FIELD QUALITY CONTROL A. Testing Agency: Contractor shall engage a qualified independent testing and inspecting agency to perform field tests and inspections and prepare test reports. B. Testing Services: Testing of composite samples of fresh concrete obtained according to ASTM C 172 shall be performed according to the following requirements: 1. Testing Frequency: Obtain at least one composite sample for each 100 cu. yd. or fraction thereof of each concrete mix placed each day. a. When frequency of testing will provide fewer than five compressive-strength tests for each concrete mixture, testing shall be conducted from at least five randomly selected batches or from each batch if fewer than five are used. 2. Slump: ASTM C 143/C 143M; one test at point of placement for each composite Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 14 of 15 sample, but not less than one test for each day's pour of each concrete mix. Perform additional tests when concrete consistency appears to change. 3. Air Content: ASTM C 231, pressure method; one test for each composite sample, but not less than one test for each day's pour of each concrete mix. 4. Concrete Temperature: ASTM C 1064; one test hourly when air temperature is 40 deg F (4.4 deg C) and below and when 80 deg F (27 deg C) and above, and one test for each composite sample. 5. Compression Test Specimens: ASTM C 31/C 31M; cast and laboratory cure one set of three standard cylinder specimens for each composite sample. 6. Compressive-Strength Tests: ASTM C 39/C 39M; test one specimen at seven days and two specimens at 28 days. a. A compressive-strength test shall be the average compressive strength from 2 specimens obtained from same composite sample and tested at 28 days. C. Strength of each concrete mix will be satisfactory if average of any three consecutive compressive-strength tests equals or exceeds specified compressive strength and no compressive-strength test value falls below specified compressive strength by more than 500 psi (3.4 MPa). D. In-Place Density: 1. In-place density of compacted pavement will be determined by testing core samples according to ASTM C 42. a. One core sample will be taken for every 1000 sq. yd. (836 sq. m) or less of installed pavement, with no fewer than three cores taken. E. Test results shall be reported in writing to Architect, concrete manufacturer, and Contractor within 48 hours of testing. Reports of compressive-strength tests shall contain Project identification name and number, date of concrete placement, name of concrete testing and inspecting agency, location of concrete batch in Work, design compressive strength at 28 days, concrete mixture proportions and materials, compressive breaking strength, and type of break for both seven and 28-day tests. F. Nondestructive Testing: Impact hammer, sonoscope, or other nondestructive device may be permitted by Architect but will not be used as sole basis for approval or rejection of concrete. G. Additional Tests: Testing and inspecting agency shall make additional tests of concrete when test results indicate that slump, air entrainment, compressive strengths, or other requirements have not been met, as directed by Architect. H. Remove and replace concrete pavement where test results indicate that it does not comply with specified requirements. I. Additional testing and inspecting, at Contractor's expense, will be performed to determine compliance of replaced or additional work with specified requirements. 3.16 PROTECTION OF CONCRETE SURFACES A. Concrete surfaces shall be protected from traffic or damage until surfaces have hardened sufficiently. If necessary 1/2 in. thick plywood sheets shall be used to protect the exposed surface. Dennis Yarmouth Intermediate Middle School January 19, 2021 Dennis Yarmouth Regional School District 100% Construction Documents Perkins Eastman DPC, project #71011 32 1313 Portland Cement Concrete Pavement 15 of 15 B. Drill test cores, where directed by Architect, when necessary to determine magnitude of cracks or defective areas. Fill drilled core holes in satisfactory pavement areas with Portland cement concrete bonded to pavement with epoxy adhesive. 3.17 CONSTRUCTION WASTE MANAGEMENT A. Comply with the requirements of Division 01, GENERAL REQUIREMENTS for removal and disposal of construction debris and waste. END OF SECTION (THIS PAGE IS BLANK)