摘要
目的研究碳纳米管纤维(CNTF)对水泥基体电学性能、压力敏感性能的影响,以实现碳纳米管纤维/水泥复合材料的定向导电性能和机敏性能.方法以CNTF为增强组分,通过对CNTF进行表面处理以提高CNTF与基体间界面结合,从而制备成碳纳米管/水泥复合材料.采用Keithley2400数字源表测量不同掺量下复合材料的电阻及相同载荷下的电阻变化,并对其导电性、压敏性以及抗压性能进行测试研究.结果少量的CNTF可以显著提高水泥基复合材料的电导率,且随着碳纳米管纤维掺量的增加,导电率随之增加;将碳纳米管纤维掺入水泥净浆中形成的试件具有优良的压敏性能,且当掺量增大并且均匀分布时压敏性能表现更稳定;掺入碳纳米管纤维后,复合材料的力学性能并无明显下降.结论碳纳米管纤维可以显著提高水泥基复合材料的导电性能和压力敏感性能,而力学强度变化不大.
The purpose of this paper is to explore the influence of carbon nanotube fiber（ CNTF） on the electrical property and pressure sensitive performance of cement matrix w hen they are as enhanced components added into it. Through the surface treatment to enhance the strength of interface bonding betw een the matrix and the CNTF,carbon nanotube fiber / cement based composite materials w ere prepared. The resistance of the composites and its change under the same load,but by different dosages w ere measured using Keithley 2400 digital multimeter,and then the electrical conductivity,pressure sensitive and compressive performance of composite materials w ere tested.The results show that a small amount of CNTF can significantly improve the electrical conductivityof cement based composite materials,and the electrical conductivity is increased w ith the increment of CNTF. Furthermore,the specimens based on the composite materials have excellent pressure sensitive performance,and the pressure sensitive performance is more stable w hen the content of CNTF is increased and evenly distributed. After mixed w ith CNTF,the mechanical properties of composite materials have no significant decline. The conclusion is CNTF can significantly improve the conductive performance and pressure sensitive resistance of cement-based composite materials,meanw hile,the mechanical strength has no evident changes.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2014年第6期1062-1067,共6页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(21103112)
辽宁省教育厅科研项目(L2013235)
关键词
碳纳米管纤维
水泥基复合材料
导电性
压敏性
carbon nanotube fiber
cement matrix composites
electrical properties
pressure sensitive performance
