Research on rheological properties of micro-fine grouting cement

摘要

This article studies the influence of the fineness of cement, fly ash (FA), its composite admixture and the amount and way mixed with superplasticizer on the rheological properties of micro-fine cement (MC). By means of modern instruments and technologies (such as XRD, SEM, laser granulometer and superficial-potential apparatus etc.), the article studies the mineral compositions, the appearance character of grains, particle size distribution and superficial potential of FA and its composite materials. And through that, the reducing mechanism of FA is thoroughly analyzed. The study shows that FA and its composite admixture are excellent components which can effectively improve the rheological properties of micro-fine cement, and that the superplasticizer has a saturation point and the mixing way of it has a great influence on the rheological properties.