纤维导电性对地聚合物压敏行为的影响

Effect of Fiber Conductivity on Piezoresistive Behaviour of Geopolymer

关键词:  地聚合物  物理力学性能  压敏性能  碳纤维  玄武岩纤维

Key words:  geopolymer  physical and mechanical property  piezoresistive property  carbon fiber  basalt fiber

摘要:

采用碳纤维和玄武岩纤维改性地聚合物，分析了纤维掺量对其流动性、力学性能、电阻率及压敏行为的影响规律，揭示了纤维导电性能对地聚合物压敏性能的影响机制.结果表明：碳纤维对地聚合物流动性的影响大于玄武岩纤维；当碳纤维掺量升高时，地聚合物电阻率明显下降，且可分为缓降、突降和平缓阶段；随着碳纤维掺量的升高，地聚合物压敏性能先增强后减弱；当碳纤维体积分数为0.4%时，地聚合物压敏性能最优；玄武岩纤维对地聚合物压敏性能具有削弱作用.

Abstract:

Carbon fibers and basalt fibers were used to modify geopolymers. The impact of fiber content on the fluidity， mechanical properties， resistivity and piezoresistive behavior of geopolymers were analyzed. And then， the influence mechanism of fiber conductivity on the piezoresistive properties of geopolymers was clarified. The results show that carbon fibers have a greater impact on material fluidity of geopolymers than basalt fibers. When the carbon fiber content increases， the resistivity of geopolymers decreases significantly and the resistivity curves can be divided into slow-decreasing， sudden-decreasing and flat stages. With the increase of carbon fiber content， the effect of carbon fiber on the piezoresistive properties of geopolymers first enhances and then weakens. When the volume fraction of carbon fiber is 0.4%， the piezoresistive properties of geopolymers is optimal. However， the basalt fiber has a weakening effect on the piezoresistive properties of geopolymers.