目的目的为提升沥青路面结构性能并实现低碳目标,提出AC+超强基层沥青路面结构以减薄沥青路面结构厚度。方法方法首先采用Bisar软件对超强基层路面结构进行力学响应规律分析,提出沥青路面结构和超强基层材料设计参数;其次,开展正交试验设计,分析硅灰、粉煤灰、胶砂比参数对超强基材料力学性能影响,经极差与方差分析,寻找最优配合比;最后,通过劈裂抗拉试验,对比撒布碎石、刷毛刻槽、环氧树脂、喷洒改性沥青和橡胶沥青5种不同方式沥青层和超强基层的黏结性能。结果结果结果表明,当超强基层厚度为0.08m时,弹性模量为40GPa,结构总厚度0.52m超强基层沥青路面沥青混合料层和无机结合料层疲劳开裂寿命高于总厚度为0.74m常规沥青路面的。硅灰质量分数13%,粉煤灰质量分数11%,胶砂比0.8,水胶比0.25为超强基层材料最优配比。经劈裂抗拉强度测试,环氧树脂黏结最优,撒布碎石黏结次之,橡胶沥青黏结最差。结论结论路面厚度减薄情况下,AC+超强基层沥青路面性能优于常规沥青路面;提出了低碳、经济的新型沥青路面结构形式和材料制备方法;分析了沥青面层与超强基层的层间结合性能,并推荐采用撒布碎石方式,为复合沥青路面提供一种新的可行途径。

Objectives To improve the structural performance of asphalt pavement and achieve low-carbon goals, an AC+ultra-high-strength base asphalt pavement structure is proposed to reduce the thickness of the asphalt pavement structurue. Methods Bisar software was used to analyze the mechanical response of the ultra-high-strength base pavement structure, proposing the design parameters for the asphalt pavement structure and ultra-high-strength base material. Orthogonal experimental design was then conducted to ana⁃lyze the influence of silica fume, fly ash, and cement-sand ratio parameters on the mechanical properties of the ultra-high-strength base material. Range and variance analysis were performed to determine the opti⁃mal mix proportion. Finally, the bonding performance between asphalt layers and the ultra-high-strength base layer was evaluated through splitting tensile tests using five methods: spreading crushed stones, brush⁃ing grooves,  epoxy resin, spraying modified asphalt, and rubber asphalt. Results The results show that when the thickness of the ultra-high-strength base is 0.08 m, with an elastic modulus of 40 GPa, the total thickness of the structure is 0.52 m. The fatigue cracking life of the asphalt mixture and inorganic binder layers in the ultra-high-strength base asphalt pavement is higher than that of a conventional asphalt pave⁃ment with a total thickness of 0.74 m. The optimal mix ratio for the ultra-high-strength base material is 13% silica fume, 11% fly ash, a cement-sand ratio of 0.8, and a water-cement ratio of 0.25. The splitting tensile strength tests indicate that epoxy resin provides the best bonding,  followed by crushed stone, and rubber asphalt provides the weakest bonding. Conclusions Under reduced pavement thickness, the AC+ ultra-high-strength base asphalt pavement performs better than conventional asphalt pavement. This study proposes a low-carbon and cost-effective asphalt pavement structure and material preparation method. The interlayer bonding performance between the asphalt surface layer and ultra-high-strength base layer is ana⁃lyzed, and the use of spreading crushed stones is recommended, providing a new feasible approach for composite asphalt pavement.