摘要
以粉煤灰、矿渣粉和硅灰为混合材制备海工硅酸盐水泥,通过掺入不同量的石膏,研究石膏掺量对海工硅酸盐水泥物理性能及耐久性能的影响。试验结果表明,适宜的石膏掺量(7%),具有明显的缓凝作用,可有效激发海工硅酸盐水泥的活性,提高水泥砂浆的早期强度;当石膏掺量超过适宜范围时(>7%),会降低海工水泥的早期、后期强度,进而影响海工硅酸盐水泥的耐久性能。XRD和SEM分析表明,与P·O42.5水泥相比,适宜的石膏掺量(7%)可以提高水泥水化体系中AFt的生成量,使水泥石更加致密,孔隙率小,凝胶体多,使得水泥硬化体具有优异的力学性能和耐久性能。
The marine Portland cement was prepared with fly ash, slag powder and silica fume as admixture. The effect of gypsum addition percentages on physical properties and durability of marine Portland cement were studied by adding different amount of gypsum. The results showed that the suitable amount of gypsum （7%） had an obvious retarding effect, it could effectively stimulate the activity of marine Portland cement, and improve the early strength of cement mortar. When the amount of gypsum was out of the appropriate range （〉7%）, the early and late strength of marine Portland cement would reduce, and it also influenced the durability of marine Portland cement. The analysis results of XRD and SEM showed that compared with P .042.5 cement, proper amount of gypsum （7%） could improve the formation amount of AFt in cement hydration system, and the cement paste had more compact structure, small porosity and more gels so the hardened cement had excellent mechanical properties and durability.
出处
《水泥》
CAS
2017年第1期8-11,共4页
Cement
基金
山东省自主创新及成果转化专项(2014ZZCX05301)
关键词
石膏
海工水泥
物理性能
耐久性能
gypsum
marine cement
physical properties
durability
