硫铝酸盐水泥化学需水量的计算

CALCULATION OF CHEMICAL WATER DEMAND FOR HYDRATION OF CALCIUM SULFOALUMINATE CEMENT

计算了贝利特 -硫铝酸盐 -铁酸盐熟料与终磨时加入的石膏完全水化时所需的化学需水量 (简称CWD) .给出了一系列反应式来预测CWD .这些工作需要大量的熟料化学分析 ,将其转化为标准矿物组成 ,还需要丰富的水化机理方面的知识 .还做了敏感性研究以找出需水量与水化作用的关系 .化学需水量对石膏含量非常敏感 ,特别在质量分数 0～ 3 0 %范围内 .以水灰比m(w) /m (c)表示 (包含石膏中的水 ) ,当石膏质量分数由 0增至3 0 %时 ,典型矿物完全水化的化学需水量大约在 0 .3 7～ 0 .62之间 .波特兰水泥混凝土在孔中常残留多余的水 ,硫铝酸盐水泥混凝土则不同 ,在浇注时有足够的流动性 ,而水化后达到一种“内干”状态 ,即不含自由孔隙水 .文中报道的一些硫铝酸盐水泥混凝土的性能改善与“内干”状态有关 .

The chemical water demand (CWD) necessary for complete hydration of belite-calcium sulfoaluminate-ferrite clinkers is calculated, taking into account gypsum added during final grinding. A series of equations are developed to predict CWD. These require a bulk chemical analysis of the clinker, which is converted to normative minerals, and knowledge of hydration mechanisms. Sensitivity studies are also performed showing the relationships between water content and hydration. The CWD is sensi_tive to gypsum contents, especially in the range 0—30%(in mass). Expressed as a m (w)/ m (c)(including gypsum),the CWD for complete hydration of a typical clinker ranges from approximately 0.37 to 0.62 as gypsum contents increase from 0 to 30%. Relative to portland cement concretes, which normally retain an excess of water in pores, it is easy to achieve C S A blends which have sufficient fluidity for emplacement yet in the course of hydration achieve a “dry” internal environment, i.e., do not contain free pore water. Some of the reported property improvements are related to “dry” internal regimes.