Investigation of the capillary rise in cement-based materials by using electrical resistivity measurement

被引：25
作者：
Liang, Kun [1 ]
Zeng, Xiaohui [2 ]
Zhou, Xiaojun [1 ]
Ling, Chenbo [2 ]
Wang, Ping [2 ]
Li, Kunpeng [3 ]
Ya, Shangsong [3 ]
机构：
[1] Southwest Jiaotong Univ, Key Lab Transportat Tunnel Engn, Minist Educ, Chengdu 610031, Sichuan, Peoples R China
[2] Southwest Jiaotong Univ, Key Lab High Speed Railway Engn, Minist Educ, Chengdu 610031, Sichuan, Peoples R China
[3] Guangzhou Metro Design & Res Inst Co Ltd, Elect Engn Inst, Guangzhou 510010, Guangdong, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2018年 / 173卷
关键词：
Capillary rise; Cement-based materials; Electrical resistivity; Capillary pressure; POROUS BUILDING-MATERIALS; WATER-ABSORPTION; SATURATION DEGREE; SORPTIVITY; PORE; TRANSPORT; MOVEMENT; DYNAMICS; FLOWS;
D O I：
10.1016/j.conbuildmat.2018.02.155
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
In order to explain the nonlinear relationship between uptake water and time(0.5) during early stage of capillary rise in cement-based materials (CBMs), a batch of well-designed specimens of cement mortar with nine embedded electrodes were introduced. Water distribution in specimens and process of capillary rise in CBMs were investigated by testing the electrical resistivity. Based on the results of experiments, an improved Terzaghi capillary rise model was established by considering the variation of saturation degree of CBMs above the wetting front. Results show that (1) the nonlinear relationship between uptake water and time(0.5) was caused by the increase of saturation degree in CBMs above the wetting front, which caused the decrease of capillary pressure, (2) there was an unsaturated transitional region between the wetting front and saturated region during the capillary rise, the height of this region increased with the rise of wetting front, (3) the improved Terzaghi capillary rise model fitted experimental data well. (C) 2018 Published by Elsevier Ltd.
引用
收藏
页码：811 / 819
页数：9
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