Rapid-hardening hydraulic cements are used in a variety of applications in which reduced cementitious content is desired or early service is needed. A newly approved ASTM International standard covering these cements, ASTM C1600/C1600M, Specification for Rapid-Hardening Hydraulic Cement, has been developed by Subcommittee C01.13 on Special Cements, part of ASTM International Committee C01 on Cement.
Four types of cement are covered by the new standard: Type URH, ultrarapid hardening; Type VRH, very rapid hardening; Type MRH, medium-rapid hardening; and Type GRH, general rapid hardening, for use when higher-strength properties are not required.
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