局部叠层碳纤维水泥基材料的应变电阻效应研究

将碳纤维加入普通混凝土中,普通混凝土便成为具有自诊断功能特性的智能混凝土.利用这些功能特性可望实现土木工程结构和基础设施的健康监测.使用连续碳纤维束取代传统碳纤维增强混凝土中的短切碳纤维,研究了局部叠层碳纤维水泥基材料三点弯曲梁在单调和循环拉应力作用下电阻的变化规律,分析了局部叠层碳纤维水泥基材料的应变-电阻效应,并与连续碳纤维水泥基材料应变-电阻效应作了比较.结果表明,局部叠层碳纤维水泥基材料的应变灵敏系数是连续碳纤维水泥基材料应变灵敏系数的近23倍,但稳定性要差一些;局部叠层碳纤维水泥基材料的电阻随着拉伸应变的增大而增大,随着拉伸应变的减小而减小,可望用于土木工程结构和基础设施的健康监测.

Study on strain resistance effect of part-stromatolithic carbon fiber cement-base materials

If carbon fiber is added to common concrete, then the common concrete becomes smart concrete with self-diagnostic functional characteristic. By using the functional characteristics of the intellectual concrete, the health monitoring of the civil engineering structure and infrastructure is expected to achieve. In this paper, the continuous carbon fiber-bundle was used to replace the chopped carbon fiber in the traditional carbon fiber reinforced concrete. The changing rule of the resistance of the part-stromatolithic carbon fiber cement-based materials three-point-bending beams was studied when they were loaded on monotonous or cyclic tension stress. The strain resistance effect of part-stromatolithic carbon fiber cement-based materials was analyzed and compared with that of the continuous carbon fiber cement-based materials. The results showed that: (1) the part-stromatolithic carbon fiber cement-based materials was near 23 times the gauge factor of the continuous carbon fiber cement-based materials, but their stability was worse. (2) The resistance of the part-stromatolithic carbon fiber cement-based materials increased along with the increase of tension strain and decreased along with the decrease of tension strain. The part-stromatolithic carbon fiber reinforced cement-based materials were expected to performance the health monitoring of the civil engineering structure and infrastructure.