Pavement performance of recycled coarse aggregate based on mechanical separation method
To study the mechanical hot-mix separation technology for reclaimed asphalt pavement(RAP)and the performance of recycled coarse aggregates,the RAP is subjected to abrasion using a Los Angeles abrasion machine to obtain the recycled coarse aggregates.The abrasion rate and separation rate are used to evaluate the separation effectiveness.The abrasion rate and separation rate of RAP at different rotation counts are measured to determine the optimal process parameters.The micro-pore structure of the recycled coarse aggregates is observed using a fluorescence microscope.The recycled coarse aggregates,conventional limestone coarse aggregates from the same source,and extracted coarse aggregates are mixed with fine aggregates to prepare slurry mixtures for application in micro-surfacing.The influence of different materials on the performance of micro-surfacing is studied.The results show that the optimal process parameters for asphalt-aggregate separation are 900 rotations of the abrasion machine with a mass ratio of 1.0 between the abrasive balls and RAP.Residual asphalt still remains on the surface of the recycled coarse aggregates,which fills the open pores.Compared with the other two types of coarse aggregates,the slurry mixture prepared with recycled coarse aggregates exhibits prolonged mixing time,improved compatibility,increased resistance to water damage,lower asphalt-aggregate ratio,and effective reduction in emulsified asphalt consumption.Recycled coarse aggregates can be used as new aggregates in micro-surfacing,with superior performance and reduced construction costs.
hot-mix separationrecycled coarse aggregatemicro-surfacingmixing time
万方数据
维普
