Research on Rutting Evolution Law of Recycled Asphalt Mixture based on Discrete Element
To analyze the development law of rutting of recycled asphalt mixture pavement structure,two pavement structures of SMA-13+AC-20 recycled asphalt mixture and SMA-13 recycled asphalt mixture+AC-20 recycled asphalt mixture are selected.The evolution law of rutting of pavement structure is analyzed by full-scale accelerated loading test and PFC numerical simulation.The results show that the development of rut depth of pavement structure is divided into two stages.In the first stage,the rut depth increases rapidly,and the pavement is compacted again.After 300,000 times of loading,the rut depth of the two pavement structures is 6 mm and 5.6 mm respectively.In the second stage,the rut develops steadily,and the growth rate of rut depth in the second stage is 9.83％and 9.46％.The rut depths of the two pavement structures calculated by PFC are 6.2 mm and 5.9 mm,respectively.The permanent deformation of the upper and lower layers of the two pavement structures is basically 25％and 75％of the total deformation.The use of recycled asphalt mixture as pavement paving material can effectively reduce the rut depth of the road and reduce the plastic deformation caused by the road.Due to the different materials of pavement structure,the shear stress is concentrated between the layers of the road,but the shear stress between the layers of the double-layer recycled pavement structure is much smaller than that of the single-layer recycled pavement structure,and when the road depth is more than 8 cm,the shear stress fluctuation caused by vehicle load is small.
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