Mechanical response and damage evaluation of cement-stabilized crushed stone base roads under load and freeze-thaw coupling effects
Yiqi Wang, Yiqiu Tan, Meng Guo, Xinglong Wang
Abstract
Cement stabilized crushed stone base material is widely used in pavement structures, but it is prone to damage under complex loads and freeze-thaw cycles, which can lead to pavement failure. Due to insufficient consideration of the behavior of the material under the coupling conditions of freeze-thaw and dynamic loads in engineering, there are deficiencies in the assessment of its freeze-thaw damage mechanism and fatigue life . Based on this, this article constructs a fully controlled load freeze-thaw test system suitable for simulating structures of cement stabilized crushed stone base, and based on this test system, the mechanical response of small-sized pavement structures under load freeze-thaw action is measured. The results indicate that compared to a single load, freeze-thaw cycles and load coupling accelerate the deterioration of pavement structures and produce greater deformation in the crushed stone base. Finally, the load freeze-thaw damage factor was constructed and introduced into the fatigue equation. The life prediction equation for freeze-thaw damage of cement stabilized crushed stone base structure was derived and established, providing a theoretical basis for guiding the engineering application of cement stabilized crushed stone base materials in cold regions.