粉煤灰综合利用 2013 NO.2 FLY ASH COMPREHENSIVE UTILIZATION 专题研究 小应力下碳纳米管/碳纤维水泥基材料压敏特性研究* Research on Pressure-sensitive Properties of Carbon Nanotube-carbon Fiber/Cement Composites under Low Stress 左俊卿 (同济大学先进土木工程材料教育部重点实验室,上海201804) 摘要:测试了碳纳米管/碳纤维水泥基材料的抗压强度,研究了其在小应力范围内循环载荷下电阻率的变化特性, 结果表明,当碳纳米管掺量控制在0.2%到1.0%之间,碳纳米管其有利于增强水泥基材料抗压强度、线性度和可逆性, 从而提高水泥基材料压敏性能.碳纳米管/碳纤维水泥基材料作为压力传感器用于车辆检测、动态称重计量和车速检测 等工程实际有非常好的前景. 关键词:碳纳米管;碳纤维;水泥基材料;压敏特性 中图分类号:U495 文献标识码:A文章编号:1005-8249(2013)02-0012-04 Zuo Jun-qing (Key Laboratory of Advanced Civil Engineering Materials Tongji University Ministry of Education Shanghai 201804 China Abstract:In this work pressive strength and pressure-sensitive properties of carbon nanotube-carbon fiber/cement pos- ites under low stress were tested.Results showed a CNTS 0.2%~1.0%content at about is bereficial to mechanical property and pres- sure sensitivity of the cement Test results indicated that the carbon nanotube-carbon fiber/cement posites showed the potential stress sensors for vehicle detection weigh-in-motion measurement and vehicle speed detection in traffie monitoring. Key words:carbon nanotubes;carbon fiber:cement posites:pressure-sensitive properties 20世纪90年代以来,人们对具备自感知和记忆、异常的、十分优异的力学、电磁学、化学和热电性 自诊断、自适应、自修复特性的多功能智能水泥基材料能-].本文以导电掺合料的形态和导电性能为基 产生强烈兴趣.智能水泥基材料是指在原有水泥基材 础,结合水泥基材料的压敏机理,以碳纳米管和碳纤维 料组分基础上复合石墨、碳纤维、碳纳米管、钢渣、钢纤 作为复合材料的导电增强相,制备碳纳米管/碳纤维水 维等智能型组分,使水泥基复合材料表现出温敏性、压 泥基复合材料,并研究碳纳米管对水泥基材料压敏效 敏性和磁敏性等特殊性能[.2. 应的影响,为水泥基压敏材料作为压力传感器用于交 水泥基材料压敏性是指其电阻率会随应力状态的 通监测...