Composition Design of REO-LM-S Compound Recycled Asphalt and Molecular Dynamics Simulation of Regeneration Mechanism
In view of the low utilization rate of RAP in recycled asphalt mixture,poor elastic recovery effect of waste engine oil(REO)and poor rutting resistance of aged asphalt,this paper intends to use high molecular polymer modifier(LM-S)to modify REO recycled asphalt.Response surface design method was used to determine the optimal dosage of two kinds of recycling agent,and the regeneration mechanism was re-vealed by the analysis of chemical functional groups of recycled asphalt by Fourier transform infrared spectros-copy(FTIR)and molecular dynamic simulation.Finally,the performance of reclaimed asphalt with REO-LM-S was verified by asphalt mortar pull-out test.The results show that the optimum dosage of regenerating agent in regenerated asphalt is 9.53％,and the optimum dosage of LM-S in regenerating agent is 30％.The penetration,ductility and softening point of regenerated asphalt at 25 ℃ can meet the specification require-ments.REO-LM-S compound regenerant can improve the performance of aged asphalt by increasing the content of light components in regenerated asphalt.Compared with reo regenerant,REO-LM-S compound regenerant has better diffusion and fusion effect on aged asphalt components.The maximum average tensile stress of the blend interface with REO-LM-S regenerant is 29％higher than that without regenerant and 7.8％higher than that with REO regenerant.
asphalt pavement material regenerationresponse surface methodmolecular dynamics simu-lationdiffusion coefficientrelative concentration of atom
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