裂缝修补组合结构弯曲拉伸试验研究

Study on bending tensile test of crack repair composite structure

针对沥青路面低温开裂及裂缝修补等问题,通过弯曲拉伸试验比较沥青混凝土原状试件和裂缝修补组合结构在不同温度下的弯拉强度、破坏弯拉应变和破坏弯曲劲度模量,结合应力应变曲线分析,计算单位体积破坏能,进而检验和评价裂缝修补组合结构的低温抗裂性能。结果发现,弯曲拉伸试验能较好检验裂缝修补组合结构的低温抗裂性能,通过单位体积破坏能可综合评价裂缝修补组合结构的低温抗裂性能,从而指导优化修补材料与修补工艺。

Aiming at the related problems of low-temperature cracking and crack repair of asphalt pavement,the flexural tensile strength,failure flexural tensile strain and failure flexural stiffness modulus of asphalt concrete undisturbed specimen and crack repair composite structure at different temperatures are compared through flexural tensile test.Combined with the analysis of stress-strain curve,the failure energy per unit volume is calculated,then the low temperature crack resistance of crack repair composite structure is tested and evaluated.The results show that the flexural tensile test can better test low-temperature crack resistance of the crack repair composite structure and evaluate its lowtemperature crack resistance by the failure energy per unit volume,so as to guide the optimization of repair materials and technology.