The influence of moisture content on the piezoresistive effect of CFRCM bundles during pull-out tests and the modification of its piezoresistive model

IF 3.9 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Shiji Sun, Dawei Zhang, Xuhua Lin, Kezhen Zhang, ZhiYu Xie, Yifei Gong
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引用次数: 0

Abstract

Carbon Fabric Reinforced Cementitious Matrix (CFRCM) can serve dual functions of structural strengthening and sensing owing to the excellent electrical conductivity of carbon fibers. The moisture content of CFRCM significantly influences the electrical conductivity of carbon fibers. To investigate the effects of moisture content on the mechanical properties and piezoresistive effect of CFRCM bundles, pull-out tests were conducted on CFRCM bundles with moisture content ranging from 0 to 10%. The test results indicate that moisture content has no effect on the peak load of the specimens; however, the peak displacement corresponding to the peak load increases with higher moisture content. In the elastic loading stage, the resistance of most specimens increases with strain, accompanied by fluctuations in the measured resistance. When the moisture content is 8%, the resistance fluctuations are most pronounced. The effect of moisture content on the resistance of the carbon fiber bundle is negligible. Instead, moisture content primarily affects the initial resistance and displacement of the CFRCM bundles. Based on these findings, the piezoresistive model was modified. The corrected model accounts for an increased number of fibers in the carbon fiber bundle sleeve layer, enhancing the load-bearing capacity of the CFRCM bundle and improving the accuracy of the results. This study provides a theoretical foundation for the intelligent health monitoring of concrete structures under varying moisture conditions.

含水率对CFRCM束拉拔压阻效应的影响及其压阻模型的修正
碳纤维具有优良的导电性,因此具有结构强化和传感双重功能。CFRCM的含水率对碳纤维的导电性有显著影响。为研究含水率对CFRCM束力学性能及压阻效应的影响,对含水率为0 ~ 10%的CFRCM束进行了拉拔试验。试验结果表明:含水率对试件的峰值荷载没有影响;随着含水率的增加,峰值荷载对应的峰值位移增大。在弹性加载阶段,大多数试件的阻力随应变增大而增大,并伴有实测阻力的波动。当含水率为8%时,阻力波动最为明显。含水率对碳纤维束阻力的影响可以忽略不计。相反,含水率主要影响CFRCM束的初始阻力和位移。基于这些发现,对压阻模型进行了修正。修正后的模型考虑了碳纤维束套筒层中纤维数量的增加,增强了CFRCM束的承载能力,提高了计算结果的准确性。该研究为变湿度条件下混凝土结构的智能健康监测提供了理论基础。
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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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