As a kind of low strength aggregate, the mechanical properties of sandstone can hardly meet the requirements of current specifications for highway concrete materials. In this study, oblique prestressing technology is used to overcome the shortcomings of the mechanical properties of sandstone and the construction process. Sandstone concrete is used in the road base, and a finite element model of sandstone concrete is established. Through the concept of the whole life cycle of concrete materials, the structure of sandstone concrete composite pavement is optimized, and the objective function of the life cycle of composite pavement based on sandstone concrete materials is proposed. When using 5 cm rubber asphalt concrete single-surface layer and 18 cm sandstone concrete obliquely prestressed concrete base layer, the objective function value is the smallest, indicating the best optimization result. These results provide a basis for the later application of sandstone concrete materials.

砂岩作为一种低强度骨料，其机械性能几乎不能满足现行公路混凝土材料规范的要求。在这项研究中，斜向预应力技术被用来克服砂岩力学性能和施工过程的缺点。在路基中采用砂岩混凝土，建立了砂岩混凝土的有限元模型。通过混凝土材料全生命周期的概念，优化了砂岩混凝土复合路面的结构，提出了基于砂岩混凝土材料的复合路面生命周期的目标函数。当使用5 cm橡胶沥青混凝土单面层和18 cm砂岩混凝土倾斜预应力混凝土基层时，目标函数值最小，表明优化效果最佳。这些结果为砂岩混凝土材料的后续应用提供了依据。