Dynamic microstructural evolution of hardened cement paste during first drying monitored by 1H NMR relaxometry
Dynamic microstructural evolution of hardened cement paste during first drying monitored by 1H NMR relaxometry
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DOI：
10.1016/j.cemconres.2019.04.017
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发表时间：
2019-08-01
影响因子：
11.4
通讯作者：
Kurihara, Ryo
中科院分区：
文献类型：
--
作者：
Maruyama, Ippei;Ohkubo, Takahiro;Kurihara, Ryo
在这项研究中，在硬化水泥浆体的微观结构重组的变化率下的第一次干燥，这是由水化硅酸钙（C-S-H）的胶体性质所造成的，通过H-1核磁共振弛豫法确认。在第一次干燥时，水从较大的孔隙中蒸发，而层间水开始增加。在质量变化期间，层间水继续增加，直到达到峰值。在达到峰值后，层间水逐渐减少，而水化物间水和毛细管水出现，质量变化不大。基于这些数据，凝胶孔隙和层间空间被认为共享可移动的C-S-H片，并且从这些孔隙中去除水引起C-S-H片之间的距离的变化，这将凝胶孔隙转化为层间空间。
In this study, the rate of change of microstructural re-organization in hardened cement paste under the first drying, which is caused by the colloidal nature of calcium-silicate-hydrate (C-S-H), is confirmed via H-1 nuclear magnetic resonance relaxometry. Under the first drying, water evaporates from larger pores, while the interlayer water begins to increase. During the mass change, interlayer water continues to increase until reaching a peak. After the peak has been reached, interlayer water gradually decreases, while interhydrate water and capillary water appear with little observable change in mass. Based on the data, gel pores and interlayer spaces are considered to share movable C-S-H sheets, and removal of water from such pores causes a change in distance between C-S-H sheets, which transforms gel pores to interlayer spaces.