RUHPC + AC刚柔复合式路面层疲劳试验研究

Research on Fatigue Testing of RUHPC + AC Rigid-Flexible Composite Pavement Layers

摘要: 基于复合式路面及相关材料的发展现状，本文研究了一种新型RUHPC + AC复合式沥青路面结构，其中RUHPC层作为下面层起承重作用，表面AC层起功能作用。在三点弯曲破坏试验基础上，进一步开展三点弯曲疲劳试验，研究不同厚度组合的RUHPC + AC复合试件的疲劳寿命特性。研究结果表明：RUHPC + AC复合试件弯曲疲劳试验破坏的应力比远高于常规的普通AC试件；复合试件总厚固定时，RUHPC层厚度增加可同步提升弯拉强度与疲劳寿命，且当RUHPC层厚度达到2 cm时性能呈现跃升式增长，RUHPC层对复合结构性能起主导作用；建立了RUHPC + AC复合试件的疲劳方程。

Abstract: Based on the current development status of composite pavements and related materials, this paper proposes a new RUHPC + AC composite asphalt pavement structure, where the RUHPC layer serves as the underlying layer providing load-bearing capacity, while the surface AC layer provides the functional performance. Utilizing the results from three-point bending failure tests, three-point bending fatigue tests were conducted to investigate the fatigue life characteristics of RUHPC + AC composite specimens with different thickness combinations. The research findings indicate that the failure stress ratio during the bending fatigue tests of the RUHPC + AC composite specimens is significantly higher than that of conventional AC specimens. For specimens with constant total thickness, increasing RUHPC layer thickness simultaneously enhances flexural tensile strength and fatigue life, with a significant leap in performance observed when the RUHPC layer reaches 2 cm, demonstrating that the RUHPC layer plays a decisive role. Furthermore. Fatigue equation for the RUHPC + AC composite specimens is also proposed.