Performance indexes of chopped basalt fiber.

How to select suitable pavement materials for asphalt pavements according to the functional requirements of layers is still the focus of research by scholars in various countries. However, their effectiveness in combating high-temperature rutting and fatigue cracking in middle and lower layers is limited. To address this issue, a study optimized the incorporation of basalt fibers in different layers to improve road performance based on design specifications. Nine asphalt pavement structures with varying amounts of basalt fibers were assessed using an orthogonal test method. The optimal structure was determined considering factors such as fatigue life and overloading using the finite element method for modeling. Results showed that fiber dosage had a minimal impact on road surface bending subsidence and the location of tensile strain in the lower layer. Shear stresses were concentrated mainly at the outer edges of loads. Optimal dosages of basalt fiber were determined for different layers: 0.3% for the upper layer, 0.1% for the middle layer, and 0.3% for the lower layer. The optimal structure consists of a strong base with a thin-surfaced semi-rigid base layer, with 0.3% for the upper layer and 0.1% for the middle layer. This study provided valuable insights into designing basalt fiber asphalt pavement structures.

如何根据各结构层的功能需求为沥青路面（asphalt pavements）选取适配的路面材料，仍是各国学者的研究热点。然而现有方案在抵御中、下面层的高温车辙与疲劳开裂问题上效果有限。为解决该问题，本研究基于设计规范，通过优化不同结构层内玄武岩纤维（basalt fibers）的掺加量以提升路面性能。研究采用正交试验法（orthogonal test method），对9种不同玄武岩纤维掺量的沥青路面结构进行了性能评估；结合疲劳寿命与超载等因素，借助有限元法（finite element method）建模确定了最优路面结构。结果表明，纤维掺量对路面表面弯沉以及下层拉应变的位置影响极小；剪应力主要集中在荷载外缘区域。最终确定了各结构层的最优玄武岩纤维掺量：上面层为0.3%、中面层为0.1%、下面层为0.3%。最优路面结构采用强基薄面的半刚性基层，其中上面层掺量0.3%、中面层掺量0.1%。本研究可为玄武岩纤维沥青路面结构的设计提供有价值的参考。