水泥基碳纤维复合材料压敏性的研究

研究了在不同压力下掺有碳纤维的特制水泥试块的电阻率.结果表明,随着压力的增大,电阻率变化存在可逆感应阶段、平衡阶段和剧增阶段,反映了试块内原有缺陷裂纹的闭合张开、新裂纹的萌生和裂纹的扩展破坏,并从导电机理上进行了分析.碳纤维水泥试块的这种特性,使其可作为一种本征智能材料,用于混凝土大坝等工程的无损检测.

STUDY ON THE COMPRESSION SENSIBILITY OF CEMENT MATRIX CARBON FIBRE COMPOSITE

The resistivity of cement specimens under different pressures was studied. The specimens are mixed with carbon fibres. The results show that when pressure gets larger and larger, the resistivity of specimens changes. This process can be divided into three parts:reversible sensing period, balance period and sharp increasing period. These three periods respectively show the closure opening of original cracks, the embryo of new flaws and defects extending to failure. The conducting mechanism is also analyzed. The characteristic of carbon fibre cement can be used in the non destructive detection of concrete dams, etc.