钙矾石
石膏
半水合物
成核
化学
硫酸盐
等温过程
钙
降水
等温微量热法
无机化学
饱和(图论)
化学工程
矿物学
硅酸盐水泥
水泥
材料科学
冶金
热力学
有机化学
气象学
工程类
物理
组合数学
数学
焓
作者
Sylvie Pourchet,Laure Regnaud,Jorge Pérez,André Nonat
标识
DOI:10.1016/j.cemconres.2009.07.019
摘要
Hydration reactions of C3A with various amounts of calcium sulfate hemihydrate, gypsum or a mixture of the two, were investigated by isothermal microcalorimetry, and a monitoring of the ionic concentrations of diluted suspensions. This study shows that sulfate type used modifies the early C3A–CaSO4 hydration products and the rate of this hydration. The fast initial AFm formation observed before ettringite precipitation in the C3A–gypsum system is avoided as soon as hemihydrate is present in the suspension. This was attributed to higher super saturation degrees and then higher nucleation frequency with regard to the ettringite obtained in the presence of hemihydrate. Moreover, replacement of gypsum by hemihydrate also leads to an increase of the ettringite formation rate during at least the five first hours under experimental conditions.
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