Mechanical Properties and Prediction Models of Cement-Stabilized Macadam at Different Temperatures

To characterize the mechanical properties of cement-stabilized macadam (CSM) at different temperatures, the effects of different curing temperatures, cement contents, and curing periods on the mechanical strength growth mechanism of the CSM were investigated herein. The unconfined compressive strength (R-u), splitting strength (R-s), and compressive modulus of resilience (R-m) of 1476 CSM specimens were determined experimentally and used to analyze the formation characteristics, mechanism, and growth trend of the mechanical strength at different temperatures. A novel prediction model of the mechanical properties of CSM based on a multivariate-regression logit model was established. The curing temperature, cement content, and curing period were set as independent variables, and the mechanical property indexes R-u, R-s and R-a were set as the dependent variables in the proposed model. A multivariate-regression logit model and the MINITAB statistical analysis software were used to calculate and analyze the test data. The accuracy of the models was verified against the experimental results. The proposed prediction models of mechanical properties can serve as a guide for engineering construction and provide a technical reference for controlling early damage in CSM-based asphalt pavements.