New insights into autogenous self-healing in cement paste based on nuclear magnetic resonance (NMR) tests
New insights into autogenous self-healing in cement paste based on nuclear magnetic resonance (NMR) tests
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基于核磁共振（NMR）测试的水泥浆体自修复新见解
DOI：
10.1617/s11527-015-0664-9
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发表时间：
2016-07-01
影响因子：
3.8
通讯作者：
Pel, Leo
中科院分区：
文献类型：
--
作者：
Huang, Haoliang;Ye, Guang;Pel, Leo
本研究的目的是研究水从裂缝迁移到大块糊状物中对自愈的影响。利用核磁共振（NMR）技术来监测自修复过程中水从裂缝迁移到大块浆料中。核磁共振结果表明，最初裂纹中的水迁移到本体膏体中，并且本体膏体的含水量显着增加。然而，经过 5 小时的自愈后，通过 NMR 测定的大块糊料（靠近裂纹表面）中非化学结合水的量反而减少了。这表明来自裂缝的一些水被用于散装浆体中未水化水泥颗粒的额外水合作用（在自愈过程中）。在这项研究之前，就自修复而言，仅关注与裂缝填充相关的恢复。裂缝表面附近水泥浆致密化的观察和量化为自修复提供了新的见解。
The aim of this study is to investigate the effect of water migration from cracks into the bulk paste on autogenous self-healing. Nuclear magnetic resonance (NMR) technique was utilized to monitor water migration from cracks into the bulk paste during the process of autogenous self-healing. NMR results show that initially the water in the crack migrates into the bulk paste and the water content of the bulk paste increases significantly. However, after 5-h autogenous self-healing, the amount of non-chemically bound water in the bulk paste (adjacent to the crack surfaces) determined by NMR decreased instead. It indicates that some of the water coming from the crack was used for additional hydration of unhydrated cement particles in the bulk paste (during the process of autogenous self-healing). Before this study, in term of autogenous self-healing only the recoveries that related to the filling of cracks were concerned. The observation and quantification of densification of cement paste adjacent to the crack surfaces provides a new insight into autogenous self-healing.