高活性阿利特硫铝酸盐水泥及其水化反应

利用青海省当地原材料制备阿利特硫铝酸盐水泥熟料.该熟料结合了硅酸盐熟料和硫铝酸盐熟料的优点,具有碱性与硫酸根离子的双重激发作用,能很好地激发矿渣、粉煤灰等活性矿物材料.在此基础上,提出了高活性阿利特硫铝酸盐水泥方案.通过微观结构分析,探讨其水化反应的机理与过程,并阐明了复合胶凝体系的优势互补作用的原理.实验证明,高活性阿利特硫铝酸盐水泥,能充分发挥熟料自身独特的矿物组成特性和活性矿物材料的火山灰效应,使硬化浆体中Ca(OH)2含量降低,并因此而获得较为适宜的晶/胶比,使其后期强度明显提高.

High-activity Alite-sulphoaluminate Cement and Its Hydration Reaction

The alite-sulphoaluminate clinker was made by use of raw materials got from Qinghai Province, China. The clinker combines the advantages of Portland cement clinker and sulphoaluminate cement clinker and can excite the activity of mineral admixtures such as fly ash and slag more easily because of its alkaline and sulfate dual activation. Based on those properties of the clinker, a kind of compound cement, high-activity alite-sulphoaluminate cement (HAASC) was prescribed. By means of microstructural analyses, the hydration reaction mechanism of HA ASC was discussed, and the principle of dominant complementation effect in a complex cementitious system was stated. It is proved that the concentration of Ca(OH)2 in hardened HAASC paste is much lower than that in ordinary Portland cement paste, and its long-term strength is improved with an appropriate crystal/gel ratio because of its particular mineral composition of clinker and dual activation to slag and fly ash, however its early strength is somewhat lower.