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ASTM Standard covers rapid hardening hydraulic cements.

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September 10, 2009 - Developed by Subcommittee C01.13 on Special Cements, ASTM C1600/C1600M lists minimum requirements for compressive strength, setting time, shrinkage, and soundness of 4 types of cements. Ultra rapid hardening, very rapid hardening, medium rapid hardening, and general rapid hardening cements are used in applications in which reduced cementitious contents are desired or early service is needed, such as paving, construction, stucco, mortar, and block.

Rapid Hardening Hydraulic Cements Covered in New ASTM Standard

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ASTM International
100 Barr Harbor Dr., Box C700
West Conshohocken, PA, 19428-2959

Press release date: September 8, 2009

W. CONSHOHOCKEN, Pa., September 8, 2009-Rapid hardening hydraulic cements are used in a variety of applications in which reduced cementitious contents are desired or early service is needed. Included among these applications are paving, construction, stucco, mortar and block. 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. According to James K. Hicks, CERATECH Inc., and chair of C01.13, four types of cement are covered by ASTM C1600/C1600M: Type URH-ultra rapid hardening, for use where ultra high early strength is desired;
Type VRH-very rapid hardening, for use where very high early strength is desired;
Type MRH-medium rapid hardening, for use where mid-range rapid hardening, high early strength is desired; and
Type GRH -general rapid hardening, for use when the higher strength properties of Type VRH or a Type MRH cement is not required. "ASTM C1600 lists minimum requirements for compressive strength, setting time, shrinkage and soundness (autoclave expansion)," says Hicks. "Optional specifications for sulfate expansion, alkali silicate reactions with aggregates, heat of hydration and expansion in water are also listed." Hicks goes on to note that ASTM C1600 cements that require calcined clinker typically use much less heat and evolve less carbon dioxide than other forms of clinker production. "Some C1600 cements are made principally from coal combustion products, thereby requiring no additional fuel use evolving no additional carbon dioxide," says Hicks. ASTM International standards can be purchased from Customer Service (phone: 610-832-9585; or at

For technical information, contact James K. Hicks, CERATECH Inc., Baltimore, Md. (phone: 936-697-2893; Committee C01 will meet Dec. 9-11 during December committee week in Atlanta, Ga. ASTM International welcomes and encourages participation in the development of its standards. ASTM's open consensus process, using advance Internet-based standards development tools, ensures worldwide access for all interested individuals. For more information on becoming an ASTM member, please contact Scott Orthey, ASTM International (phone: 610-832-9730; Established in 1898, ASTM International is one of the largest international standards development and delivery systems in the world. ASTM International meets the World Trade Organization (WTO) principles for the development of international standards: coherence, consensus, development dimension, effectiveness, impartiality, openness, relevance and transparency. ASTM standards are accepted and used in research and development, product testing, quality systems and commercial transactions around the globe.

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