基于应力吸收层材料组成及路用性能验证的研究

Research on Composition of Stress-absorbing Layer Materials and Verification of Pavement Performance

摘要:

应力吸收层是路面结构中极具实用性的层间夹层结构，这类材料自身具备优异的变形适应能力与弹性恢复性能，能够有效吸收、消散旧基层接缝处传递至加铺面层的集中应力，从而延缓反射裂缝的萌生与扩展。通过设计应力吸收层材料并研究其路用性能，在已有的油石比前提下进行路用性能实验，对比验证原有SBS改性沥青在原有基础上进行复合改性后的路用性能。可以得出：在已知油石比的前提下，经复合改性处理后的混合料，路用性能得到显著提升。研究结果可为路面结构抗裂防治提供借鉴。

Abstract:

The stress-absorbing layer is a highly practical interlayer structure in pavement structures. This type of material itself has the excellent deformation adaptability and elastic recovery performance, which can effectively absorb and dissipate the concentrated stress transmitted from the joints of the old base course to the overlay surface course, thereby delaying the initiation and propagation of reflective cracks. By designing the materials of the stress-absorbing layer and studying their pavement performance, the pavement performance tests are conducted under the existing asphalt-aggregate ratio to compare and verify the pavement performance of the original SBS modified asphalt after composite modification on the original basis. It can be concluded that on the premise of a known asphalt-aggregate ratio, the pavement performance of the mixture after composite modification has been significantly improved, which can provide a reference for the crack resistance and prevention of pavement structures.