Electrical Resistance Tomography for Assessing Water Movement in Cracked Cementitious Mixtures
Electrical Resistance Tomography for Assessing Water Movement in Cracked Cementitious Mixtures
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用于评估破裂水泥混合物中水运动的电阻层析成像
DOI：
10.1051/matecconf/201819911016
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发表时间：
2018
影响因子：
--
通讯作者：
and Isao Ujike
中科院分区：
文献类型：
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作者：
Keiyu Kawaai;and Isao Ujike
电阻层析成像（ERT）已被研究用于可视化混凝土试件的电导率变化。近年来，非饱和水通过混凝土中形成的孔隙的流动已被深入研究，通过ERT系统可视化渗透前沿，随着时间的推移逐渐变化。本研究探讨通过内部裂缝，通常不会观察到砂浆或混凝土试样通过ERT系统的表面上的水的运动。结果表明，由于水通过裂缝表面进入，饱和区域逐渐增加，直至120小时。而且，在未开裂部分中估计的具有较高电导率的区域与在分裂表面上由水分计测量的较高水分含量明显地吻合。此外，由于水在裂缝区的快速移动，通过ERT图像可以清楚地看到进水后混凝土样本中裂缝的存在。这项研究提供了重要的洞察力，通过水泥混合物中形成的孔隙和裂缝的水的侵入和运动可以通过电气测量进行评估。
Electrical resistance tomography (ERT) has been studied for visualizing variations of conductivity in concrete specimens. In recent years, unsaturated water flow through pores formed in concrete has been intensively examined though ERT systems to visualize the permeation front that gradually changes with elapsed time. This study examines water movement through internal cracks which are typically not observed on the surface of mortar or concrete specimens via ERT systems. The results indicate the gradual increase of saturated region owing to the ingress of water through cracked surface up to 120 hours. And, the region with higher conductivity estimated in uncracked parts is evidently in good agreement with higher moisture content measured by moisture meter on the split surface. In addition, the presence of crack in concrete specimen subjected to water ingress is clearly visualized via ERT images owing to rapid water movement in cracked zones. This study has provided the important insight that the ingress and the movement of water through pores and cracks formed in cementitious mixtures could be assessed via electrical measurements.