| 引用本文: | 刘晨,郑旭,王昕,魏丽颖,王旭方,颜碧兰,林宗寿.过硫磷石膏矿渣水泥浆活性钙检测方法研究[J].建筑材料学报,2015,18(4):699-703 |
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| 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℃. |
| 关键词: 磷石膏 水泥 活性钙 检测方法 |
| DOI：103969/j.issn1007 9629201504028 |
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| 基金项目:国家高技术研究发展计划(863计划)项目（2012AA06A112） |
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| Determination Method of Active Calcium in Persulfate |
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Phosphogypsum Slag Cement SlurryLIU Chen1, ZHENG Xu1, WANG Xin1, WEI Liying1, WANG Xufang1, YAN Bilan1, LIN Zongshou2
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1.State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China;2.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
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| Abstract: |
| Change rule of active calcium content in persulfate phosphogypsum slag cement slurry was investigated. 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 macroscopic 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 2h and mixing temperature should be 20℃. |
| Key words: phosphogypsum cement active calcium determination method |
