中文摘要：

为研究水泥基碳纤维复合材料的应变传感特性,对带有预制裂缝的混凝土梁试件进行三点弯曲试验。试验结果表明：水泥基碳纤维智能层传感器可感知混凝土梁平均应变的变化;且其与弯拉荷载呈线性变化关系。在压阻效应第一阶段,短切碳纤维发生重新搭接而使得水泥基智能层的电阻变化率随平均应变的增加而急剧增加;在压阻效应第二阶段,水泥基智能层形成新的导电网络其电阻变化率基本趋于稳定;且与梁的平均应变有很好的线性一致性。因此,可通过监测水泥基智能表层电阻变化率来监测梁的平均应变,从而达到检测裂缝宽度的要求。

英文摘要：

In order to study the strain sensing characteristics of cement-based carbon fiber composite material, the three-point bending test was carried out for the concrete beam with precast crack.The test results show that cement based carbon fiber smart layer can sense the change of the average strain of the concrete beams, and it has a linear relationship with the bending load.In the first stage of piezoresistive effect, the cut carbon fibers re-lapped and makes the resistance change rate of the cement based carbon fiber smart layer increased sharply with the increase of average strain.In the second phase of the piezoresistive effect, a new electric network is formed and the resistance change rate is basically stable which has a good linear consistency with the average strain.Therefore, it can be used to detect the crack width of the beam.