Direct observation of void evolution during cement hydration
Direct observation of void evolution during cement hydration
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DOI：
10.1016/j.matdes.2017.09.056
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发表时间：
2017-12
影响因子：
8.4
通讯作者：
M. Moradian;Qinang Hu;Mohammed Aboustait;M. T. Ley;J. Hanan;Xianghui Xiao;G. Scherer;Zhidong Zhang
中科院分区：
文献类型：
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作者：
M. Moradian;Qinang Hu;Mohammed Aboustait;M. T. Ley;J. Hanan;Xianghui Xiao;G. Scherer;Zhidong Zhang
本文对硅酸盐水泥和硅酸三钙膏体的水化过程进行了30min ~ 16h的跟踪研究。采用原位快速x射线计算机断层扫描（fCT），在w/s为0.40 ~ 0.70的情况下，以微米分辨率直接观察了充气空洞的形成。结果表明：在加速过程的前1小时内，充气空隙的体积达到最大值，然后在加速过程中减小并保持不变；孔洞的分布由少数粗大孔洞转变为大量较小且分布均匀的孔洞。这种行为被认为是由离子强度的变化控制的，离子强度的变化导致溶解的空气从孔隙溶液中析出。
This paper follows the hydration of both portland cement and tricalcium silicate pastes between 30 min and 16 h of hydration. In-situ fast X-ray computed tomography (fCT) was used to make direct observations of the air-filled void formation in w/s of 0.40 to 0.70 with a micron resolution.The results show that over the first hour of the acceleration period the volume of air-filled voids reaches a maximum value and then decreases during the acceleration period and stays constant. The void distribution changes from a few coarse voids to a large number of smaller and more uniformly distributed voids. This behavior is suggested to be controlled by changes in the ionic strength that cause exsolution of dissolved air from the pore solution.