ASTM C76M:16 pdf download

ASTM C76M:16 pdf download.Standard Specification for Reinforced Concrete Culvert,Storm Drain, and Sewer Pipe(Metric).
8.3.1.1 For pipe 900 mm and larger in diameter, either the hell or spigot shall contain circumferential reinforcement. This reinforcement shall be an extension of a wall cage, or may be a separate cage of at least the area per metre of that specified for the outer cage or one-half of that specified for single cage wall reinforcement, whichever is less.
8.3.1.2 Where bells or spigots require reinforcement, the maximum end cover on the last circumferential shall be one-half the length of the joint or 75 mm, whichever is less.
8.3.2 Joint Reinfhrceinentftr Rubber Gasket Joints: 8.3.2. 1 For pipe 300 mm and larger in diameter, the bell
ends shall contain circumferential reinforcement. This reinforcement shall be an extension of the outer cage or a single wall cage, whichever is less, or may he a separate cage of at least the same area per metre with longitudinals as required in
8.2. If a separate cage is used, the cage shall extend into the pipe with the last circumferential wire at least 25 mm past the inside shoulder where the pipe barrel meets the hell of the joint.
8.3.2.2 Where bells require reinforcenient, the maximum end cover on the last circumferential shall be 50 mm.
9. Joints
9.1 The joints shall be of such design and the ends of the concrete pipe sections so formed that when the sections are laid together they will make a continuous line of pipe with a smooth interior free from appreciable irregularities in the flow line, all compatible with the permissible variations given in Section 13,
9.2 Joints shall conform to the requirements of Specifications C443M, C990M, C 1628, or other established joint types approved by the owner, including. but not limited to, mortar, sealant or externally-wrapped joints.
10. Manufacture
10.1 MLvture—The aggregates shall he sized, graded. proportioned, and mixed with such proportions of cemenhitious materials, water, and admixtures, if any, to produce a thoroughly mixed concrete of such quality that the pipe will conform to the test and design requirements of this specification. All concrete shall have a water-cementitious materials ratio not exceeding 0.53 by weight. Cementitious materials shall be as specified in 6.2 and shall be added to the mix in a proportion not less than 280 kg/n? unless mix designs with a lower cernentitious materials contein demonstrate that the quality and performance of the pipe meet the requirements of this specification.
10. 1 . I Mixing Water—-Water used in the production of concrete shall be potable or nonpotable water that meets the requirement of Specification Cl 602/Cl 602M.
10.2 Curing—Pipe shall he subjected to any one of the methods of curing described in 10.2.1 to 10.2.3 or to any other method or combination of methods approved by the owner, that will give satisfactory results. The pipe shall be cured for a sufficient length of time so that the specified D-load is obtained when acceptance is based on 5.1.1 or so that the concrete will develop the specified compressive strength at 28 days or less when acceptance is based on 5.1.2.