Investigation of self-sealing in high-strength and ultra-low-permeability concrete in water using micro-focus X-ray CT
Investigation of self-sealing in high-strength and ultra-low-permeability concrete in water using micro-focus X-ray CT
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DOI：
10.1016/j.cemconres.2012.08.014
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发表时间：
2012-11-01
影响因子：
11.4
通讯作者：
Kaneko, Katsuhiko
中科院分区：
文献类型：
--
作者：
Fukuda, Daisuke;Nara, Yoshitaka;Kaneko, Katsuhiko
高强度超低渗透混凝土（HSULPC）被认为可用作放射性废物包装。因此，需要高限制能力。对于水泥材料，由于钙化合物的沉淀，可能会在水中发生裂缝的封闭。这会影响限制能力。在本研究中，使用微焦点 X 射线计算机断层扫描 (CT) 研究了水中 HSULPC 裂纹的密封。沉淀造成的密封仅发生在样本末端周围。使用三维图像配准和对样品浸入水中之前和之后获得的图像进行 CT 图像减影来识别裂缝的密封区域，以评估裂缝中密封沉积物的时间变化。随着 HSULPC 样品在水中保存时间的延长，密封沉积物也会增加。结论是，HSULPC 在水中的裂纹通过沉淀而被封闭。 (C) 2012 Elsevier Ltd. 保留所有权利。
High-strength and ultra-low-permeability concrete (HSULPC) is thought to be useful as a radioactive waste package. Thus, a high confining ability is desirable. For cementitious materials, sealing of cracks may occur in water due to the precipitation of calcium compounds. This can affect the confining ability. In this study, the sealing of a crack in HSULPC in water was investigated using micro-focus X-ray computed tomography (CT). The sealing by precipitation occurred only around the end of the specimen. Sealed regions of the crack were identified using three-dimensional image registration and CT image subtraction of images obtained for the specimen before and after it was immersed in water to evaluate temporal changes of the sealing deposits in the crack. The sealing deposits increased as the HSULPC specimen was kept in water longer. It was concluded that cracks in HSULPC in water are sealed by precipitation. (C) 2012 Elsevier Ltd. All rights reserved.