The Influence of Slag Particle Size Distribution to the Pore Structure and Mechanics Performance of Slag Cement System in Early Period

摘要

In this paper, the effects of both additive quantity and particle size distribution of slag powder to cement stone strength and inner pore structure in hydration early ages were mainly discussed. It was shown that the suitable size distribution of slag powder make packing state of powder consisted of both slag and cement improved and can improve strength of slag cement in different ages. In early age of hydration, following increase of dry powder packing density, specific surface area of pores in cement stone obviously increase, however, average pore diameter remarkably decrease. In the meantime, quantity of the pore (＞50nm) damaging the strength of cement stone are decreased, with increase of the gel tenuous pore (＜50nm) quantity. As packing density of powders mixed increase, fluidity of cement pastes is decreased.