Research on the Sensing Properties of CNT-CF/Cement-based Materials
ZUO Junqing1,2, ZHOU Hong1,2, YAO Wu3, WU Delong1,2, LIU Xiaoyan4, ZHANG Yumei4
1 Shanghai Construction Group Co., Ltd., Shanghai 200080; 2 Shanghai Engineering Research Center of Mega Structure High Performance Concrete, Shanghai 201114; 3 Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804; 4 College of Mechanics and Materials, Hohai University, Nanjing 210098
Abstract: Carbon nanotubes (CNTs) and carbon fibers (CFs) were incorporated into cement based materials to fabricate CNT-CF/cement-based materials. The temperature-sensitivity and pressure-sensitivity of CNT-CF/cement-based materials were studied. Results show that when content of CNTs is low (<0.5%), CNTs can effectively improve the temperature and pressure sensitive properties of CNT-CF/cement-based materials. The activation energy, temperature sensitivity coefficient, the linearity degree and repeatability rate of pressure-sensitivity increase as the CNT content increases. As the CNT content continue to increase, sensing properties of CNT-CF/cement-based materials decline. Specimen containing 0.5% (mass fraction) CNTs exhibits the optimal sensing properties. Using CNT-CF/cement-based materials to develop cement-based temperature sensor and pressure sensor has a certain application prospect.
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2017, Vol. 31 
