SEDL / STP / STP441-EB / STP48351S

A Comparison of ISO and ASTM Tests for Cement Strength

Foster, B. E.
Consultant, Building Research Division, and Materials Engineer, Codes and Standards SectionPersonal members ASTM, National Bureau of Standards, Washington, D. C.,

Blaine, R. L.
Consultant, Building Research Division, and Materials Engineer, Codes and Standards SectionPersonal members ASTM, National Bureau of Standards, Washington, D. C.,

Pages: 28    Published: Jan 1968

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Abstract

A comparison of compressive strength tests of six portland cements shows that the proposed ISO procedures gave results from 25 to 95 per cent higher than ASTM C 109, depending upon strength level, test age, and cement fineness. The testing sand is seen as the major problem in developing a truly international standard for cement strength, and it is concluded that the selection of equivalent sands is complicated by the prescribed mechanical compaction, which causes forced bleeding. ISO tests using Ottawa-type, round-grain sands are described.