Experiments on the Use of Granulated Blast-Furnace Slag as Fine Aggregate for Concrete

Abstract

In this paper, we describe the results of the experiments on the effect of the physical properties, gradation and shape of hard-granulated blast-furnace slag on workability, bending and compressive strength of mortar or concrete. The results may be summariged as follows; 1) The bulk specific gravities of hard-granulated blast-furnace slag used in this experiments are 2.61〜2.81, which are comparatively large. While the absorptions of this slag are 1 percent or less which are smaller than mountain sand. 2) The mobility of the mortar made of the noncrushed-granulated blast-furnace slag is inferior to that of mountain sand, while the mobility of the mortar made of the crushed-hard-granulated blast-furnace slag is improved by the roundish shape of the slag and the properties as fine aggregate for concrete are satisfactory. 3) The crushed-hard-granulated blast-furnace slag can be utilized sufficiently as fine aggregate for concrete from the standpoint of the strength and workability of concrete.