1、07-11 03 41 33 - 1 SECTION 03 41 33 PRECAST STRUCTURAL PRETENSIONED CONCRETE SPEC WRITER NOTE: Delete between /-/ if not applicable to project. Also delete any other item or paragraph not applicable in the section and renumber the paragraphs. PART 1 - GENERAL 1.1 DESCRIPTION: A. This section specifi
2、es precast prestressed concrete construction including design not shown, fabrication, erection, and other related items including bearing pads and anchorage. B. Precast prestressed concrete includes / single tees / double tees / hollow- core slabs / beams and spandrels / columns / I beams/box beams
3、/ tee/keystone joists / step units / ribbed wall panels /. 1.2 RELATED WORK: A. Materials testing and inspection during construction: Section 01 45 29, TESTING LABORATORY SERVICES. B. Concrete: Section 03 30 00, CAST-IN-PLACE CONCRETE. C. Sealants and Caulking: Section 07 92 00, JOINT SEALANTS. D. A
4、rchitectural Precast Concrete Panels: Section 03 45 00, PRECAST ARCHITECTURAL CONCRETE. E. Repair of abraded galvanized and painted surfaces: Section 09 91 00, PAINTING. 1.3 QUALITY ASSURANCE: A. Manufacturer Qualifications: Precast concrete manufacturing plant shall be certified by Prestressed Conc
5、rete Institute, Plant Certification Program, prior to start of production. B. In lieu of above qualification, contractor shall meet and pay for following requirements: 1. Retain an independent testing or consulting firm approved by Resident Engineer. 2. This firm shall inspect precast plant at two-w
6、eek intervals during production and issue a report, certified by a registered Professional Engineer verifying that materials, methods, products and quality control meet all requirements of specifications and drawings. When report indicates to the contrary, Resident Engineer may reject any or all pro
7、ducts produced during period of noncompliance with above requirements. C. Precast concrete work shall be performed by firms that have demonstrated capability, subject to approval, to produce and erect type of work specified. Provided by IHSNot for ResaleNo reproduction or networking permitted withou
8、t license from IHS-,-,-07-11 03 41 33 - 2 D. Precast concrete manufacturer shall have on staff or shall retain a qualified registered Professional Structural Engineer to certify precast concrete conforms in all aspects to requirements of ACI 318. E. Erector Qualifications: Regularly engaged for at l
9、east 5 years in erection of precast structural concrete similar to requirements of this project. F. Requirements of Regulatory Agencies: Local codes plus applicable specifications, standards and codes are a part of these specifications. 1.4 SUBMITTALS: A. Submit in accordance with Section 01 33 23,
10、SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES. B. Shop Drawings: 1. Erection Drawings: a. Plans and/or elevations locating and defining material furnished by manufacturer. b. Sections and details showing connections, cast-in items and their relation to structure. c. Description of all loose, cast-in and
11、field hardware. d. Field installed anchor location drawings. e. Erection sequences and handling requirements. f. Dead, live and other applicable loads used in design. 2. Production drawings: a. Elevation view of each member. b. Sections and details to indicate quantities and position of reinforcing
12、steel, anchors, inserts, and essential embedded hardware. c. Lifting and erection inserts. d. Dimensions and finishes. e. Prestress for strand and concrete strengths. f. Estimated cambers. g. Method of transportation. C. Product Design Criteria: 1. Loadings for design: a. Initial handling and erecti
13、on stresses. b. Dead and live loads as specified on contract drawings. c. Other loads specified for member where they are applicable. d. Deflection of precast members shall be limited as follows: 1) Vertical Live Load - Span/360 2) Wind Load - 0.0025 x Floor to Floor Height e. Design shall provide f
14、or thermal movements of completed structure. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-07-11 03 41 33 - 3 2. Design calculations of products shall be performed by a registered Professional Engineer experienced in precast prestressed concrete de
15、sign. 3. Design shall be in accordance with applicable codes, ACI 318 and the PCI Design Handbook. 4. Details for waterproof joints between precast members. D. Mix Designs: Submit proposed concrete mix designs and appropriate test data as specified in Part 2 of this section. E. Permissible Design De
16、viations: 1. Design connections according to the conceptual details shown in the contract documents. 2. Design deviations will be permitted only after Resident Engineers written approval of manufacturers proposed design supported by complete design calculations and drawings. 3. Design deviations sha
17、ll provide an installation equivalent to basic intent without incurring additional cost to the Government. F. Test Reports: Concrete and other material. 1.5 PRODUCT DELIVERY, STORAGE AND HANDLING: A. Delivery and Handling: 1. Lift and support precast concrete members during manufacturing, stockpilin
18、g, transporting and erection operations only at lifting or supporting points, or both, as shown on contract and shop drawings, and with approved lifting devices. Lifting devices shall have a minimum safety factor of 4. Exterior lifting hardware shall have a minimum safety factor of 5. 2. Transportat
19、ion, site handling, and erection shall be performed with acceptable equipment and methods, and by qualified personnel. B. Storage: 1. Store all units off ground. 2. Place stored units so that identification marks are discernible. 3. Separate stacked members by battens across full width of each beari
20、ng point. 4. Stack so that lifting devices are accessible and undamaged. 5. Do not use upper members of stacked tier as storage area for shorter member or heavy equipment. 1.6 APPLICABLE PUBLICATIONS: A. Publications listed below form a part of this specification to extent referenced. Publications a
21、re referenced in text by basic designation only. B. American Society for Testing and Materials (ASTM): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-07-11 03 41 33 - 4 A36/A36M-08 Standard Specifications for Carbon Structural Steel A82-07 . Standar
22、d Specifications for Steel Wire, Plain, for Concrete Reinforcement A123/A123M-09 Standard Specifications for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products A153/A153M-09 Standard Specifications for Zinc Coating (Hot-Dip) on Iron and Steel Hardware A185-07 Standard Specifications for S
23、teel Welded Wire, Fabric, Plain, for Concrete Reinforcement A307-10 Standard Specifications for Carbon Steel Bolts and Studs A325-10 Standard Specifications for Structural Bolts, Steel, Heat Treated A416/A416M-10 Standard Specifications for Steel Strand, Uncoated Seven-Wire for Prestressed Concrete
24、A615/A615M-09 Standard Specifications for Deformed and Plain Billet-Steel Bars for Concrete Reinforcement A706/A706M-09 Standard Specifications for Low-Allow Steel Deformed and Plain Bars for Concrete Reinforcement A767/A767M-09 Standard Specifications for Zinc-Coated (Galvanized) Steel Bars for Con
25、crete Reinforcement A775/A775M-03(R2008) . Standard Specifications for Epoxy-Coated Reinforcing Steel Bars C33-03 . Standard Specifications for Concrete Aggregates C88-05 . Standard Test Method for Soundness of Aggregates by Use of Sodium Sulfate or Magnesium Sulfate C150-07 Standard Specifications
26、for Portland Cement C260-10 Standard Specifications for Air-Entraining Admixtures for Concrete C330-05 Standard Specifications for Lightweight Aggregates for Structural Concrete C494/C494M-10 Standard Specification for Chemical Admixtures for Concrete C. American Concrete Institute (ACI): 117-10 . S
27、tandard Specifications for Tolerances for Concrete Construction and Materials 318-08 . Building Code Requirements for Structural Concrete and Commentary Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-07-11 03 41 33 - 5 D. Prestressed Concrete Instit
28、ute (PCI): MNL-116-99 . Manual for Quality Control for Plants and Production of Precast Concrete Products Fourth Edition MNL-127-99 . Erectors Manual: Standards and Guidelines for the Erection of Precast Concrete Products F. American Welding Society (AWS): D1.1/D1.1M-10 Structural Welding Code - Ste
29、el D1.4-11 Structural Welding Code - Reinforcing Steel PART 2 - PRODUCTS SPEC WRITER NOTE: Make material requirements agree with applicable requirements specified in the referenced Applicable Publications. Update and specify only that which applies to the project. 2.1 MATERIALS: A. Portland Cement:
30、ASTM C150, Type I or III. B. Aggregates: ASTM C33, Coarse and Fine. C. Lightweight Coarse Aggregate: ASTM C330, maximum size 19mm (3/4 inch), maximum 15 percent loss when tested in accordance with ASTM C88. D. Air-entraining Admixture: ASTM C260. E. Chemical Admixtures: ASTM C494. F. Mixing Water: F
31、resh, clean, and potable. G. Reinforcing Steel: ASTM A615M, Grade 400 MPa (ASTM A615, Grade 60), deformed. H. Weldable Reinforcing Steel: ASTM A706M, Grade 400 MPa, (ASTM A706 Grade 60). I. Galvanized Reinforcing Steel: ASTM A767M, Grade 400 MPa, (ASTM A767, Grade 60) Class II, hot-dipped galvanized
32、 after fabrication and bending. J. Epoxy-Coated Reinforcing Steel: ASTM A775M, Grade 400 MPa, (ASTM A775, Grade 60). K. Anchor Bolts: ASTM A307, low-carbon steel bolts, regular hexagon nuts and carbon steel washers, galvanized. L. High-Strength Threaded Fasteners: Heavy hexagon structural bolts, hea
33、vy hexagon bolts, and hardened washers complying with ASTM A325, galvanized. M. Welded Wire Fabric: ASTM A185. N. Wire Reinforcement: ASTM A82. O. Prestressing Steel: ASTM A416, Grade 250K or 270K, uncoated, 7-wire, stress-relieved strand. Provided by IHSNot for ResaleNo reproduction or networking p
34、ermitted without license from IHS-,-,-07-11 03 41 33 - 6 P. Anchors and Inserts: ASTM A36 structural steel plates and shapes, ASTM A153 or ASTM A123 hot dipped galvanized finish. Q. Non-metallic Shrinkage-Resistant Grout: Proprietary pre-mixed, non-metallic, non-corrosive, non-staining product conta
35、ining selected silica sands, Portland cement, shrinkage compensating agents, plasticizing and water reducing agents, complying with CRD-C-621. Minimum cube strength of 62 MPa (9000 psi) at 28 days when placed at flowable consistency. R. Bearing Pads: 1. Elastomeric Pads: Vulcanized, chloroprene elas
36、tomeric compound, molded to size or cut from a molded sheet, 50-60 shore A durometer. 2. Laminated Fabric-Rubber Pads: Preformed, unused synthetic fibers and new, unvulcanized rubber. Surface hardness of 70-80 shore A durometer. 4. Sliding Pads: Manufactured assembly with Polyetrafluoroethylene (PTF
37、E) surface, with glass fiber reinforcing as required for service load bearing stress. Combine with elastomeric base where required for full contact bearing. 5. Plastic: Multi-monomer plastic strips, non-leaching and able to support construction loads with no visible overall expansion. S. Welded Stud
38、s: AWS D1.1. T. Welded Rebar: AWS D1.4. U. Caulking and Sealants: Specified under Section 07 92 00, JOINT SEALANTS. V. Accessories: Provide clips, hangers, and other accessories required for installation of project units and for support of subsequent construction or finishes. 2.2 CONCRETE MIXES: A.
39、Normal-Weight Concrete: 1. Compressive Strength: 35 MPa (5000 psi) minimum at 28 days. 2. Release Strength: 25 MPa (3500 psi) minimum at transfer of prestress. B. Lightweight Concrete: 1. Compressive Strength: 35 MPa (5000 psi) minimum at 28 days. 2. Release Strength: 25 MPa (3500 psi) minimum at tr
40、ansfer of prestress. 3. Air-Dry Density: Not less than 1440 kg per cubic meter (90 pounds per cubic foot) nor more than 1840 kg per cubic meter (115 pounds per cubic foot). 4. Drying Shrinkage (ASTM C330): Maximum 0.035 percent at 28 days. C. Do not use calcium chloride, chloride ions or other salts
41、. 2.3 FABRICATION: A. Fabrication Procedures: PCI MNL-116. B. Fabrication Tolerances: PC MNL-ll6 and ACI 117 for reinforcing steel placement. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-07-11 03 41 33 - 7 C. Finishes: 1. Standard Underside: Resul
42、ting from casting against approved forms using good industry practice in cleaning of forms, design of concrete mix, placing and curing. Small surface holes caused by air bubbles, normal color variations, normal form joint marks, and minor chips and spalls will be tolerated, but no major or unsightly
43、 imperfections, honeycomb, or other defects will be permitted. 2. Standard Top: Result of vibrating screed and additional hand finishing at projections. Normal color variations, minor indentations, minor chips and spalls will be permitted. No major imperfections, honeycomb, or defects will be permit
44、ted. 3. Exposed Vertical Ends: Strands shall be recessed and the ends of member will receive sacked finish. D. Supports for Reinforcement: Provide supports for reinforcement including bolsters, chairs, spacers and other devices for spacing, supporting and fastening reinforcing, complying with CRSI r
45、ecommendations. For exposed-to-view concrete surfaces, shear legs of supports are in contact with forms, provide supports with legs that are plastic protected or stainless steel protected. E. Use epoxy coated reinforcing whenever concrete cover is less than 50 mm (2 inches) for top surfaces exposed
46、to deicing salts, brackish water or salt spray, such as in parking garage decks. F. Openings: Primarily on thin sections, factory fabricate those openings 250 mm (10 inches) round or square or larger as shown on drawings. Locate and field drill or cut other openings where no contact is made with pre
47、stressing or reinforcing steel after precast prestressed products have been erected. Opening shall be approved by Resident Engineer before drilling or cutting. G. Patching: Patching will be acceptable providing structural adequacy of product and appearance are not impaired. H. Defective Work: Precas
48、t concrete units which do not conform to specified requirements, including strength, tolerances, and finishes, shall be removed and replaced with precast concrete units that meet the requirements of this section. Contractor is also responsible for cost of corrections to other work affected by or res
49、ulting from corrections to precast concrete work. I. Fasteners: Cast in galvanized hardware such structural inserts, bolts and plates as required by drawings. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-07-11 03 41 33 - 8 PART 3 - EXECUTION 3.1 ERECTION: A. Site Access: Provide suitable access to building, proper drainage, an
