Damage in carbon fiber-reinforced concrete, monitored by both electrical resistance measurement and acoustic emission analysis
Damage in carbon fiber-reinforced concrete, monitored by both electrical resistance measurement and acoustic emission analysis
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DOI：
10.1016/j.conbuildmat.2007.08.004
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发表时间：
2008-11-01
影响因子：
7.4
通讯作者：
Liu, Juanyu
中科院分区：
文献类型：
--
作者：
Chen, Bing;Liu, Juanyu
混凝土结构的实时损伤检测变得越来越重要。本文采用电阻测量和声发射分析两种方法对碳纤维增强混凝土（CFRC）在单轴压缩和三点弯曲条件下的损伤进行了监测。研究表明，载荷挠度曲线、电阻变化与声发射命中之间存在良好的相关性。对于CFRC，其导电性取决于碳纤维接触后形成的渗透网络。材料内部发生的破坏导致渗透网络的破坏，并导致电阻的增加。因此，电阻的变化反映了整个加载过程中的损伤情况。另一方面，声发射技术可以通过分析声发射参数来检测并可能识别纤维-绳复合材料的损伤机制。这两种技术在CFRC损伤监测中是互补的。(C) 2007 Elsevier Ltd.版权所有。
Real time damage detection of concrete structure is becoming more and more critical. In this paper, damage in carbon fiber-reinforced concrete (CFRC) under uniaxial compression and three-point-bending conditions was monitored by both electrical resistance measurement and acoustic emission (AE) analysis. The research showed a good correlation existing among curve of load-deflection, changes in electrical resistance and AE hits. For CFRC, the electrical conductivity depends on the percolation network formed by the contacting carbon fiber. The damage occurring inside materials causes breakdown of percolation network and results in an increase in electrical resistance. Therefore, the change in electrical resistance reflects the damage during the entire loading process. On the other hand, AE technique can detect and possibly identify damage mechanisms in fiber-rein forced composites by analyzing AE parameters. These two techniques are complementary for the monitoring damage in CFRC. (C) 2007 Elsevier Ltd. All rights reserved.