Method for evaluating segregation in self-consolidating concrete using electrical resistivity measurements

被引：32
|
作者：
Yim, Hong Jae [1 ]
Bae, Young Hwan [2 ]
Kim, Jae Hong [3 ]
机构：
[1] Pusan Natl Univ, Dept Civil Engn, Busan 46241, South Korea
[2] Kyungpook Natl Univ, Dept Construct & Disaster Prevent Engn, Sangju 37224, South Korea
[3] Korea Adv Inst Sci & Technol, Dept Civil & Environm Engn, Daejeon 34141, South Korea
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2020年 / 232卷
基金：
新加坡国家研究基金会;
关键词：
Segregation; Self-consolidating concrete; Electrical resistivity; Square array electrode method; CONDUCTIVITY;
D O I：
10.1016/j.conbuildmat.2019.117283
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Self-consolidating concrete requires a highly fluid binder with sufficient segregation resistance in the fresh mixture. However, careless mix proportioning with various chemical and mineral admixtures can cause instability among the components in the fresh state, including aggregate segregation. The fully or partially segregated mix expectedly exhibits low durability after it hardens. This study attempted to nondestructively evaluate the degree of static segregation in self-consolidating concrete. A column type test mold was fabricated, which allowed cross-sectional electrical resistivity to be measured in the top and bottom sections using a total of 24 electrodes. The electrical resistivity can sensitively evaluate the relative degree of segregation in concrete mixtures. The experimental results were also compared and discussed using the coarse aggregate segregation index obtained using the conventional method, that requires wet-sieving of self-consolidating concrete in the fresh state. (C) 2019 Elsevier Ltd. All rights reserved.
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页数：6
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