THE INFLUENCE OF SLOWLY COOLED FURNACE SLAG SAND EXCERTS ON STRENGTH DEVLPOMENT EFFECT OF HARDENED MORTARS CONTAINIG BLAST FURNACE SLAG, AND THOSE MECHANISMS

Abstract

The influence of slowly cooled furnace slag exerts on strength development of hardened mortars containing blast furnace slag, and those mechanisms were investigated. Hardened mortars are consisted of blast furnace slag as major binder and of slowly cooled furnace slag sand found fine aggregate. The flow value difference was small between types of fine aggregate, while early to long age compressive strength of hardened mortars containing slowly cooled furnace slag sand were higher than that containing natural sand. It is assumed that the hydroxide ion dissolved from slowly cooled furnace slag sand which was carried by calcium ion has accelerated of blast furnace slag.