In order to study the mechanical behavior of asphalt overlay reinforced with paving fabrics (a system composed of non-woven geotextile and asphalt cement) a new methodology was developed based on three new pieces of laboratory equipment including 3-point bending test (3-PBT) method on cylindrical specimens, crack widening device (CWD) and water-vacuum permeability device (WVPD). The 3-PBT and CWD were designed to simulate generation and propagation of thermally driven cracking from an existing discontinuity in the pavement system into a new asphalt overlay. In addition, the WVPD was assembled to accelerate the movement of water through a low porosity medium. On such basis, representative parameters have been suggested by the authors as: crack resistance index of the system to determine the reinforcement effect and coefficient of permeability ( K ) to evaluate the waterproofing benefit of the paving fabrics. The experimental results of two different rehabilitation strategies of bituminous pavements were compared during this research: a traditional strategy, as a reference case, in which asphalt overlay is directly attached to the existing surface with an asphalt emulsion and a new strategy with the inclusion of paving fabric as an interlayer system between two asphalt layers, as the reinforced case. The results indicate that the reinforced case has enhanced mechanical properties, in terms of lower crack width manifested at the surface and higher crack resistance index and reduced water permeability. In addition, the proposed methodology appears to be suitable to evaluate the mechanical performance of reinforced asphalt overlays.

中文翻译：

---

使用新方法测量铺路织物增强沥青覆盖层的渗透性和机械性能

为了研究铺路织物（一种由无纺土工布和沥青水泥组成的系统）增强的沥青覆盖层的力学性能，基于三件新的实验室设备开发了一种新方法，包括三点弯曲试验（3-PBT ) 方法在圆柱形试样、裂纹加宽装置 (CWD) 和水真空渗透装置 (WVPD) 上进行。3-PBT 和 CWD 旨在模拟从路面系统中现有的不连续性到新的沥青覆盖层的热驱动裂缝的产生和扩展。此外，组装 WVPD 以加速水通过低孔隙率介质的运动。在此基础上，作者建议的代表性参数如下：体系的抗裂指数来确定补强效果和渗透系数（K）来评价铺路布的防水效果。本研究比较了两种不同沥青路面修复策略的实验结果：传统策略作为参考案例，其中沥青覆盖层通过沥青乳液直接附着在现有表面上，以及包含铺路的新策略织物作为两层沥青层之间的夹层系统，作为增强层。结果表明，增强型外壳具有增强的机械性能，表现为表面裂纹宽度更小，抗裂指数更高，透水性降低。此外，