ASTM C 494/C 494M - 05 Standard Specification for Chemical Admixtures for Concrete

American Society for Testing and Materials (ASTM). Current edition approved May 1, 2005. Published May 2005. Originally approved in 1962. Last previous edition approved in 2004 as C 494 – 04. 10 p. This specification covers materials for use as chemical
admixtures to be added to hydraulic-cement concrete mixtures in the field for the purpose or purposes indicated for the seven types as follows:
Type A—Water-reducing admixtures,
Type B—Retarding admixtures,
Type C—Accelerating admixtures,
Type D—Water-reducing and retarding admixtures,
Type E—Water-reducing and accelerating admixtures,
Type F—Water-reducing, high range admixtures, and
Type G—Water-reducing, high range, and retarding admixtures.