Abstract
Ground granulated blast furnace slag was first introduced in the 1950's in South Africa as a partial substitute for ordinary portland cement in the manufacture of concrete. Over the years, however, the percentage of blast furnace slag to be mixed with portland cement in the production of concrete has increased greatly. Its use has also spread widely during the past thirty years, and it has now been adopted extensively as a standard construction material in the U. K., Canada, and the U. S. A.. More recently it was introduced for such use in Japan. This paper will initially deal with the production and quality of the materials in Japan, the Japanese standard specifications, and the methods of testing, and then will go on to discuss the workmanship involved in producing ground granulated blast furnace slag concrete. Much emphasis is laid on the handling, batching, and mixing procedures; the selection of mixes, and in particular the slag replacement; the curing of formed concrete; temperature rise in mass concrete; more durable concrete to withstand attacks by seawater and other salts; and alkali aggregate reaction (AAR).
