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Evaluation of cracking resistance potential of geosynthetic reinforced asphalt overlays using direct tensile strength test

机译:使用直接抗拉强度试验评估土工合成材料沥青覆盖层的抗裂性

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摘要

The study aims at evaluation of cracking resistance potential of geosynthetic reinforced two-layered asphalt specimens under direct tensile strength test (DTT), conditioned at different temperatures (20 degrees C, 30 degrees C and 40 degrees C). Apart from determining the tensile stiffness of the asphalt specimens, the DTT is also capable of evaluating the cracking resistance potential through estimating the energy dissipated during cracking. The potential to resist reflection cracking may be improved with the inclusion of geosynthetic-interlayer. To understand the crack propagation patterns and to quantify the resulting strain fields, digital image correlation (DIC) technique was employed. The geosynthetic-interlayers used in the current study consist of a glass-grid composite (GGC), a bi-axial polyester grid coated with polymer modified binder (PE), a biaxial polypropylene grid (PP) and a woven geo-jute mat (GJ).
机译:该研究旨在评估在不同温度(20摄氏度,30摄氏度和40摄氏度)条件下进行的直接拉伸强度试验(DTT)下的土工合成材料增强两层沥青样品的抗裂性潜力。除了确定沥青试样的拉伸刚度外,DTT还能够通过估计开裂过程中耗散的能量来评估其抗开裂能力。包含土工合成夹层可以提高抵抗反射裂缝的潜力。为了理解裂纹扩展模式并量化所产生的应变场,采用了数字图像相关(DIC)技术。当前研究中使用的土工合成中间层包括玻璃网格复合材料(GGC),涂有聚合物改性粘合剂(PE)的双轴聚酯网格,双轴聚丙烯网格(PP)和编织的土黄麻垫( GJ)。

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