过硫磷石膏矿渣水泥浆活性钙检测方法研究  

Determination Method of Active Calcium in Persulfate Phosphogypsum Slag Cement Slurry

作　　者：刘晨[1,2] 郑旭[1] 王昕[1] 魏丽颖[1] 王旭方[1] 颜碧兰[1] 林宗寿[2] 

机构地区：[1]中国建筑材料科学研究总院绿色建筑材料国家重点实验室,北京100024 [2]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《建筑材料学报》2015年第4期699-703,共5页Journal of Building Materials

基　　金：国家高技术研究发展计划(863计划)项目(2012AA06A112)

摘　　要：研究了过硫磷石膏矿渣水泥浆活性钙含量的变化规律,通过盐酸滴定法和EDTA滴定法对比、试验条件敏感性分析、检测方法重复性和复验性研究,确立了过硫磷石膏矿渣水泥浆活性钙含量的检测方法.结果表明:活性钙含量比pH值指标更能表征过硫磷石膏矿渣水泥浆的水化活性,与水化产物宏观性能相关性更好;由于过硫磷石膏矿渣水泥浆属于贫钙体系,活性钙含量较低,盐酸滴定法较EDTA滴定法更适用.盐酸滴定法的重复性和复验性良好,但对搅拌时间和搅拌温度敏感,最终确定搅拌时间为2h,搅拌温度为20℃.Change rule of active calcium content in persulfate phosphogypsum slag cement slurry was inves- tigated. Through the comparison of test methods such as hydrochloric acid titration and EDTA titration, sensitivity analysis of test conditions, and research on reproducibility and repeatability of the test methods, a determination method for the active calcium content in persulfate phosphogypsum slag cement slurry was established. The results show that compared with the pH value, the content of active calcium can better represent the activity of persulfate phosphogypsum slag cement slurry and has more correlation with mac- roscopic properties of the hydration products. Since persulfate phosphogypsum slag cement slurry belongs to the poor-calcium system with low content of active calcium, the determination method of hydrochloric acid titration is more suitable than EDTA titration. The repeatability and uniformity of hydrochloric acid titration are good, but it is sensitive to the mixing time and mixing temperature. It will be convenient that the mixing time should be 2 h and mixing temperature should he 20 ℃.

关 键 词：磷石膏 水泥 活性钙 检测方法 

分 类 号：TU528.01[建筑科学—建筑技术科学]