SYNOPSIS The Concrete Committee of the Japan Society of Civil Engineers (JSCE) organized Subcommittee in 1985 for the Research on the use of ground granulated blast-fumace slag (ground slag) as an admixture when JSCE was entrusted to make researches and recommendation for design and construction of concrete mixed with ground slag by related corporation. After the subcommittee had made extensive researches, recommended practice was drawn up in 1988 on the basis of the results of research works. The recommended practice includes recommendation on the use of ground slag as an admixture and JSCE standards on quality and test methods for ground slag. S Shigeyoshi NAGATAKI, Chairman Shigeyoshi NAGATAKI is professor of Tokyo Institute of Technology, Tokyo. He received his Doctor of Engineering Degree from the University of Tokyo in 1966. Currently, much of his research work has been on slag, fly ash, expansive cement, superplasticizer, and torsion of reinforced concrete. He has written some 100 papers on these subjects. He is a member of JSCE, JCI, AIJ, RILEM and a fellow of ACI.