关键词: 硫铝酸盐基促强减缩剂;硫铝酸盐熟料;硬石膏;强度;水化热;水化产物

Abstract: The sulphoaluminate-based strength-promoting and shrinkage-reducing admixture(SP-SRA) was added into the standard cement, and sulphoaluminate clinker-anhydrite-standard cement was designed according to a certain proportion.By comparing the macro-performance, the hydration process and the micro-products of the two systems, the conclusions were drawn.The results show that the strength and the hydration heat release rate of the standard cement with SP-SRA is higher than the ternary system of sulphoaluminate clinker-anhydrite-standard cement, XRD show that the AFt content of the standard cement with SP-SRA is more than the ternary system.The expansibility of ettringite makes the structure of cement stone more dense, which is helpful to improve the strength of cement stone.There is obvious AFm formation in the sulphoaluminate clinker-anhydrite-standard cement system, that is, part of AFt is transformed into AFm.

Key words: sulphoaluminate-based strength-promoting and shrinkage-reducing admixture;sulphoaluminate clinker;anhydrite;strength;hydration heat;hydration product