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The purpose of this study is to explore the microstructure evolution and key properties of porous asphalt mixture under stress. By comparing the image processing of the cutting surface before and after loading, the damage area was determined and verified by the discrete element modelling and simulation results. The change of cavity and the formation of crack are analysed by two-dimensional image processing technology, and the damage behaviour of cutting surface is explained. Through the improved mechanical test and drainage test, the change of the key properties of the mixture under different damage degree was discussed. The results show that the generation and development of cracks have obvious influence on the splitting tensile strength and drainage performance of porous asphalt mixture, and have certain influence on the splitting shear strength.

Micro-structural evolution of porous asphalt mixture and its influence to key behaviour based on loading action