- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | ZHOU Zhongyi, ZHAO Hongsheng, LIU Yan, CHEN Jianwei, ZHANG Wenming, HONG Yani. Self-Sensing Performance of Ultra-High Performance Fiber-Reinforced Concrete Under Cyclic Loading[J].Journal of Southwest Jiaotong University.doi:10.3969/j.issn.0258-2724.20240649
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To study the self-sensing performance of ultra-high performance concrete (UHPC) mixed with steel fibers and multi-walled carbon nanotubes (MWCNTs) under different cyclic stress amplitudes, experimental studies were conducted on UHPC specimens with a steel fiber volume content of 2% and varying MWCNT contents. The results show that the initial resistivity of UHPC increases first and then decreases with the increase in MWCNT content, and the addition of 0.15% MWCNTs improves the conductivity of UHPC. When the MWCNT content is 0.15%, the sample exhibits optimal repeatability, with a repeatability coefficient of 0.019, and the linearity change of alternating current (AC) resistance presents a strong linear relationship with stress, with a linearity of 0.97. The stress sensitivity and strain sensitivity of the samples UHPC0 and UHPC0.05 first increase and then decrease with the increase in stress, while the stress sensitivity and strain sensitivity of samples UHPC0.1 and UHPC0.15 show a gradually decreasing trend. The maximum strain sensitivity and stress sensitivity of UHPC0.15 are 71.6% and 0.16%/MPa under different cyclic stress amplitudes, both appearing at a stress of 10 MPa. When the content of MWCNTs is 0.15%, UHPC exhibits the best self-sensing performance.
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