Fundamental Studies on the Cement Material of Coal Gasification Slag with Limestone Additive

Abstract

Characterization on two sorts of coal gasification slag, Blair Athol and Taiheiyo, with limestone additive was performed in order to obtain the relation between character of glass phase and pozzolanic reactivity of blending component. The content of CaO in slag was varied from 0 to 40wt%.
The pozzolanic reactivity of the slag is enhanced with increasing of basicity, content of acid soluble SiO₂, Al₂O₃, and CaO content in slag, and decreasing of degree of condensation of silicate ion in the glass phase.
Hydrated products from the slag cement are not basically different from those from blastfurnace slag cement.
The compressive strenght of high calcium slag cement is almost equal to that of blastfurnace slag and ordinary portland cement.