Optimization of Sandstone Concrete Pavement Materials Based on Finite Element Method

Abstract

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.