The addition of fibres to reinforce asphalt mixtures is a prospective field for pavement engineering, where the use of glass or synthetic macrofibers could potentially help not only as reinforcement for new asphalt mixtures, but also as part of asphalt overlays applied on deteriorated pavements to diminish reflective cracking during maintenance operations. In recent studies, it has been found that the addition of macrofibres can improve the rutting and fracture resistance of asphalt mixtures. However, the response of these mixtures to fatigue has not been studied yet. In this study, a complete performance characterization of a gap graded asphalt mixture with the addition of glass and synthetic macrofibres was studied. Also, a reference asphalt mixture without macrofibres was provided for comparison. Results showed that the addition of macrofibres improves water sensibility, rutting performance and stiffness of the gap grade asphalt mixtures studied. Also, it was observed during the fatigue tests that the incorporation of both types of macrofibres greatly improved the durability of the mixtures to fatigue cracking at medium range temperatures. This improved fatigue behaviour correlates to an extended useful life for the fibre reinforced asphalt mixtures. The synthetic macrofibres showed better fatigue behaviour at lower temperatures, while glass macrofibres gave a better response at the higher temperature studied.

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长纤维增强间隙级配沥青混合料的疲劳行为

添加纤维来增强沥青混合料是路面工程的一个有前景的领域，其中使用玻璃或合成粗纤维不仅可以作为新沥青混合料的增强材料，还可以作为沥青覆盖层的一部分应用于劣化路面以减少反射在维护操作中开裂。最近的研究发现，添加粗纤维可以提高沥青混合料的抗车辙和抗断裂性。然而，尚未研究这些混合物对疲劳的反应。在这项研究中，研究了添加玻璃和合成粗纤维的间隙级配沥青混合料的完整性能特征。此外，还提供了不含粗纤维的参考沥青混合料用于比较。结果表明，添加粗纤维提高了所研究的间隙级沥青混合料的水敏感性、车辙性能和刚度。此外，在疲劳测试期间观察到，两种类型的粗纤维的结合大大提高了混合物在中等温度范围内对疲劳开裂的耐久性。这种改进的疲劳行为与纤维增强沥青混合物的使用寿命延长有关。合成粗纤维在较低温度下表现出更好的疲劳行为，而玻璃粗纤维在研究的较高温度下表现出更好的响应。在疲劳测试期间观察到，两种类型的粗纤维的结合极大地提高了混合物在中等温度范围内对疲劳裂纹的耐久性。这种改进的疲劳行为与纤维增强沥青混合物的使用寿命延长有关。合成粗纤维在较低温度下表现出更好的疲劳行为，而玻璃粗纤维在研究的较高温度下表现出更好的响应。在疲劳测试期间观察到，两种类型的粗纤维的结合极大地提高了混合物在中等温度范围内对疲劳裂纹的耐久性。这种改进的疲劳行为与纤维增强沥青混合物的使用寿命延长有关。合成粗纤维在较低温度下表现出更好的疲劳行为，而玻璃粗纤维在研究的较高温度下表现出更好的响应。