Influence of the reactivity of the amorphous part of mechanically activated alite on its hydration kinetics
Influence of the reactivity of the amorphous part of mechanically activated alite on its hydration kinetics
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DOI：
10.1016/j.cemconres.2016.06.007
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发表时间：
2016-10-01
影响因子：
11.4
通讯作者：
Neubauer, J.
中科院分区：
文献类型：
--
作者：
Bergold, S. T.;Goetz-Neunhoeffer, F.;Neubauer, J.
采用热流量热法和原位x射线衍射（XRD）定量分析方法，研究了一种机械活化的alite经过不同干燥过程后的水化性能。干燥工艺对阿利特粉体的反应性有很大影响。结果表明，活化后的alite样品的非晶部分的反应性受到了特别的影响。由于无定形“alite”部分初始溶解快，水化进程明显加快。然而，如果水化过程没有像表面钝化那样被无定形的“alite”溶解加速，那么在过渡到减速期之前释放的热量就会增加。讨论了开蚀坑溶出晶状阿利石可以增加活性阿利石的表面，从而增加了向减速期过渡时的反应程度。(C) 2016 Elsevier Ltd.版权所有。
The hydration of one mechanically activated alite passing through different drying procedures is examined by heat flow calorimetry and quantitative in-situ XRD analysis. The reactivity of the alite powders is strongly affected by the drying technique. It is shown that the reactivity of the amorphous part of the activated alite sample is particularly affected. Due to the fast initial dissolution of the amorphous "alite" part, the hydration progression is speeded up significantly. However, if the hydration is not speeded up by the amorphous "alite" dissolution, as in the case of surface passivation, the heat released until the transition to the deceleration period will increase. It is discussed that a crystalline alite dissolution by etch pit opening could increase the reactive alite surface and therefore increase the reaction degree at the transition to the deceleration period. (C) 2016 Elsevier Ltd. All rights reserved.