Survey on the history of stipulations relating to grading of coarse aggregate for concrete

In this report, the history of stipulations relating to grading of coarse aggregates was investigated. In the course of survey, great influence of ASTM standards on those in Japan was verified. So many changes were proposed in the stipulations of JASS 5 and related guidelines on the way, but finally those were made consistent with the specification of Japan Society of Civil Engineers, that is, ASTM C 33 except for the few sieve sizes. The stipulations of JIS for slag and recycled coarse aggregates were established or revised in a similar way with that of JIS for crushed stone.