研究了添加纳米TiO2粒子砂浆在单调荷载及循环荷载下的压敏特性,及添加碳黑的水泥净浆的单调加载下的压敏特性.实验结果表明:在单调单向压力荷载时,添加纳米TiO2砂浆具有良好的压敏性能,其体积电阻率与压应力具有稳定而线性的对应关系;循环加载时,其体积电阻率的变化规律又能反映出材料的疲劳损伤情况.添加纳米碳黑砂浆在单调荷载下也具有较好的压敏特性,但稳定性稍差.在实验的基础上,本文探讨了水泥基纳米复合材料的压敏特性机理,分析了两种不同纳米复合材料压敏性能差异性产生的原因.
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