刚柔复合式路面层间抗裂材料疲劳性能研究

Research on Fatigue Performance of Interlaminar Anti-cracking Material for Rigid-Flexible Composite Pavement

针对刚柔复合式路面反射裂缝产生的机理和我国层间抗裂材料疲劳试验现有的研究特点与不足,成型了直接加铺、加铺浸渍土工布和加铺抗裂层材料3种不同复合试件,分别进行了弯拉型(中荷载)疲劳试验和剪切型(偏荷载)疲劳试验,并科学合理地提出了室内疲劳试验方法和反射裂缝观测方法。疲劳试验结果表明:加铺抗裂层材料明显优于直接加铺和加铺浸渍土工布,说明抗裂层材料能有效吸收裂缝处产生的弯拉应力和剪切应力,可有效延缓反射裂缝的产生和扩展。研究成果可为我国刚柔复合式路面层间抗裂层材料的合理选择与应用提供参考。

Regarding the mechanism of the reflection cracking and present condition of laboratory fatigue test of interlaminar anti-cracking material for rigid-flexible composite pavement,composite specimens of direct overlay,repaving impregnated geosynthetics,repaving anti-cracking material in three groups are tested in bending fatigue test and shear fatigue test.Laboratory fatigue test method of interlaminar anti-cracking material and observational method of reflective cracking are put forward.The fatigue test results show that anti-cracking material is the best at cracking resistance and anti-cracking material can effectively absorb bending-tensile stress and shear stress to prevent or delay the emergence and development of reflective cracking.The results can provide some reference for the reasonable choice and application of interlaminar anti-cracking material for rigid-flexible composite pavement.