对碳纤维水泥基复合材料的压敏特性进行了实验研究.结果发现,在含水量不同的情况下,碳纤维水泥基复合材料分别具有正、负两种压敏特性.含水量较高时,碳纤维水泥基材料的电阻相对变化率随应力的增大而增大,随应力的减小而减小,表现出正压敏性.而含水量较低时,电阻相对变化率随应力的增大而单调减小,随应力的减小而单调增大,表现出负压敏性,进而提出了一种双效应机理,并对这一物理现象进行了合理解释.
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