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This specification covers nonreinforced concrete pipe intended to be used for the conveyance of sewage, industrial wastes, storm water, and for the construction of culverts. Pipe manufactured according to this specification shall be of three classes of nonreinforced concrete pipe identified as Class 1, Class 2, and Class 3. These pipes shall conform to the strength requirements given in this specification. The acceptability of the pipe shall be determined by the results of the following tests: strength test; absorption test; permeability test; and hydrostatic test. Concrete design shall conform to the physical and dimensional requirements for minimum wall thickness, and minimum three-edge bearing strength. The concrete shall consist of cementitious materials, mineral aggregates, and water. The aggregates shall be sized, graded, proportioned, and mixed with such proportions of cementitious materials and water as will produce a homogeneous concrete mixture of such quality that the pipe will conform to the test and design requirements of this specification. Pipe shall be subjected to either steam curing, water curing, or membrane curing. Special shapes or fittings such as wyes, tees, bends, and adapters for use with concrete pipe conforming to this specification shall conform to the applicable requirements for concrete pipe of corresponding class and internal diameter. Joints shall be compatible with those used in adjoining concrete pipes. Fabricated branches for wyes and tees shall be securely attached to the wall of the pipe in such a manner as not to restrict or otherwise interfere with the flow characteristics of the pipe.