In this study, the mechanical properties of composite bituminous structures with geogrid products, used as an interlayer between different types of bituminous mixtures, at a constant temperature, were examined. A twofold experimental program based on new approaches was selected. A new configuration of the 3-Point Bending Test (3-PBT) was adopted to capture the J-integral and crack resistance property defined by crack resistance index (CRI) at the interface against bottom-up crack propagation. The bonding quality at the interface was also defined through a new index named coefficient of interface bonding (CIB), which was measured via a modified version of the slant shear device. The results derived from this research revealed that reinforcement of the interface, with varying degree of surface texture, by geogrid products significantly enhances the fracture toughness of the whole system in terms of the J-integral, which could be properly connected to the combined functions of bonding quality and crack resistance indices defined at the interface.

在这项研究中，研究了具有土工格栅产品的复合沥青结构在恒定温度下用作不同类型沥青混合物之间的夹层的机械性能。选择了基于新方法的双重实验程序。采用 3 点弯曲试验 (3-PBT) 的新配置来捕获由界面处的抗裂指数 (CRI) 定义的 J 积分和抗裂性能，以防止自下而上的裂纹扩展。界面处的粘合质量也通过一个名为界面粘合系数 (CIB) 的新指标来定义，该指标是通过斜剪装置的改进版本进行测量的。这项研究的结果表明，界面的强化，具有不同程度的表面纹理，