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Ready-mixed concrete is concrete manufactured for delivery to a purchaser in a plastic and unhardened state [1,2]. The American Society for Testing and Materials (ASTM) has maintained ASTM Specification for Ready Mixed Concrete (C 94) since 1933 and ASTM Specification for Concrete Made by Volumetric Batching and Continuous Mixing (C 685) since 1971. This paper will review requirements of these two specifications and their relationship to other more general concrete specifications and codes. This discussion will be supplemented by background information on the industry, operating procedures, and special problems and circumstances. The references are intended to identify additional information in particular subject areas.
Vice president of engineering and research, Giant Portland and Masonry Cement Co., Harleyville, S.C.