Mechanically activated alite: New insights into alite hydration
Mechanically activated alite: New insights into alite hydration
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DOI：
10.1016/j.cemconres.2015.06.005
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发表时间：
2015-10-01
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.
为了更好地了解阿利特的水化作用，对机械活化阿利特(M3改性)进行了X射线衍射和热流量热分析。活化导致颗粒尺寸减小、平均微晶尺寸减小和部分非晶化。活化后的阿利特样品的水化速度明显加快，24 h后阿利特完全转化，测得晶态阿利特的水化热为-548 J/g，非晶态阿利特的放热较小(-386J/g)。主水化期受C-S-H成核期控制，而加速向减速期的转变发生在阿利特细小颗粒消耗后。X射线衍射仪表明，即使在活性最高的阿利特中也有相当数量的非晶态C-S-H相析出，观察到了X射线衍射仪可检测到的C-S-H。(C)2015年提交人。爱思唯尔出版公司(Elsevier B.V.)
For superior understanding of alite hydration an investigation of mechanically activated alite (M3 modification) was performed by XRD and heat flow calorimetry. Activation resulted in reduced particle size, a decreased mean crystallite size and partial amorphization. For the samples of activated alite a significantly accelerated and intensified hydration was observed and complete conversion of alite was found after 24 h. The enthalpy of reaction for crystalline alite was determined to be -548 J/g from measured heat of hydration after 24 h. The enthalpy of reaction of amorphous "alite" was found to be less exothermic (-386 J/g). The main hydration period is controlled by nucleation of C-S-H, while the transition from acceleration to deceleration period takes place after consumption of the small alite particles. XRD amorphous C-S-H phase is indicated to precipitate in considerable amount even in the highest activated alite before "long-range ordered", XRD detectable C-S-H was observed. (C) 2015 The Authors. Published by Elsevier B.V.