Thives Liseane Padilha, Pais Jorge C, Pereira Paulo A A, Minhoto Manuel C, Trichês Glicério
Department of Civil Engineering, Federal University of Santa Catarina, Florianópolis 88037-000, Brazil.
Department of Civil Engineering, Campus de Azurém, Universidade do Minho, 48000-058 Guimarães, Portugal.
Materials (Basel). 2022 Mar 23;15(7):2375. doi: 10.3390/ma15072375.
Adequately predicting overlay behaviour is essential for flexible pavement rehabilitation to reach the predicted lifespan. Reflective cracking is one of the main failure mechanisms affecting overlay performance. This failure may occur due to cracks in the lower layers that propagate to the overlay due to traffic loads, temperature variations, shrinkage cracking of cement-treated layers, and subgrade movements. This work aims to assess the reflective cracking phenomenon of asphalt rubber mixtures as an overlay through laboratory tests and numerical simulation. Four-point bending equipment and the reflective crack device were used to perform the laboratory tests. A numerical simulation through the finite element method was accomplished to estimate the von Mises strain and develop reflective cracking fatigue laws. The results showed that the asphalt rubber mixtures are suitable for extending overlay lifespan considering reflective cracking. The evaluated asphalt rubber mixtures presented reflective cracking resistance almost eight times greater than the conventional ones.
对于柔性路面修复以达到预测的使用寿命而言，充分预测加铺层性能至关重要。反射裂缝是影响加铺层性能的主要失效机制之一。这种失效可能是由于下层裂缝因交通荷载、温度变化、水泥处理层的收缩裂缝以及路基移动而扩展到加铺层。这项工作旨在通过实验室测试和数值模拟来评估作为加铺层的橡胶沥青混合料的反射裂缝现象。使用四点弯曲设备和反射裂缝装置进行实验室测试。通过有限元方法完成了数值模拟，以估计冯·米塞斯应变并建立反射裂缝疲劳规律。结果表明，考虑到反射裂缝，橡胶沥青混合料适用于延长加铺层寿命。所评估的橡胶沥青混合料的抗反射裂缝能力几乎是传统混合料的八倍。
