Cement Asphalt Mastic Dynamic Mechanical Properties and Microstructure Research

Cement asphalt materials are nowadays widely used in the area of transportation. This paper adopted DMA method to test cement asphalt mastic of five different A/C at different temperatures. According to time-temperature superposition principle, viscoelastic parameters master curves were obtained. Through comparison of CAM model fitting results, cement asphalt mastic working performance was evaluated in three aspects of deformation resistance, temperature sensibility, and vibration reducing. Combined with microstructure analysis, mechanism of mechanical performance variation was explained. Results show that CAM model has a high fitting degree especially for A/C >= 0.8 mastic. Increase of A/C obviously reduces resistance to deforming at high temperatures but has little effect on low temperatures. Temperature sensibility increases with A/C increase especially for temperatures between 0 degrees C similar to 40 degrees C. Increase of A/C enhances vibration reducing performance. A/C variation from 0.4 to 0.8 leads to mastic skeleton structure changing which is the fundamental cause to various mechanical properties of different A/C.