凝结促进剂对硅酸盐水泥化学收缩的影响

F. Clemmens, P. Depuydt, H. Justnes, D. Gemert, E. J. Sellevold
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引用次数: 1

摘要

研究了不同钙盐对不同硅酸盐水泥膏体前48小时总化学收缩率(作为水泥水化指标)的影响。钙盐(醋酸盐、氯化物盐、甲酸盐、硝酸盐盐和亚硝酸盐盐)的加入量为等摩尔钙,相当于水泥质量中硝酸钙的1.5%。采用全自动维卡仪对水泥浆体的凝结时间进行了监测。在5℃、13℃和23℃下进行的实验表明,硝酸钙在较低温度下是最有效的凝固促进剂,在最低温度下甚至比氯化钙更有效。不同钙盐的阴离子也会影响固相,并且每种促进剂的效率强烈依赖于水泥类型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of Setting Accelerators on Chemical Shrinkage of Portland Cement
The influence of a number of calcium salts on the total chemical shrinkage (used as a measure of cement hydration) of different portland cement pastes was followed during the first 48 hours. All calcium salts (acetate, chloride, formate, nitrate and nitrite) were added in an equimolar dosage of Ca2+ corresponding to 1.5% calcium nitrate by cement weight. An automatic Vicat-apparatus was used to monitor the setting time of the cement pastes. Experiments conducted at 5 degrees C, 13 degrees C and 23 degrees C revealed that calcium nitrate was the most effective set accelerator at lower temperatures and even more effective than calcium chloride at the lowest temperature. The anions of the different calcium salts were also found to influence the setting and the efficiency of each accelerator strongly depended on the cement types.
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