The Relationship of Compressive Strength and Microstructure Parameters of Cement Asphalt Binder

The compressive strength of cement and asphalt mortar (CA mortar) is an important technical parameter of ballastless track structural dynamics of high-speed railway, which mainly depends on the compressive strength of cement asphalt binder (CAB). Base on the theory of composite materials and cement based materials, a calculation method for the compressive strength of CAB by microstructure parameters was then proposed. In order to verify the calculation method, uniaxial compressive stress-strain curves of different CABs were measured, and the phase compositions were carried out by means of vacuum saturation, constant humidity drying and asphalt extraction. The results show that the calculated results fit well with the experimental results and the correlation coefficient is greater than 0.98, suggesting that the proposed method is applicable to describe the compressive strength for such cement asphalt composite materials.