Research on the Road Performance of Recycled Asphalt Pavement Fine Fractionation Sup-20 Based on Grading Replacement
In order to study the impact of different grades of recycled asphalt pavement(RAP)fine aggregate on the per-formance of asphalt mixtures,this article relies on the oil stone separation technology and uses physical colli-sion to divide RAP fine aggregate into five grades:16-25mm,10-16mm,5-10mm,3-5mm,0-3mm.70#road petroleum asphalt is used as the new asphalt to replace the RAP fine aggregate Sup-20 in the mix design.Its road performance is verified from high temperature stability,low temperature crack resistance,and water stability.Research has shown that the effect of graded replacement on the optimal comprehensive asphalt stone ratio of asphalt mixtures is not significant,all around 4.5%;Grading replacement has little effect on the high-temperature stability of the mixture;The smaller the gear being replaced,the better the low-tempera-ture crack resistance and water stability performance;The six substitutions,including 100%dosage,do not meet the low-temperature crack resistance requirements of the specifications.Therefore,the addition of fine materials should be strictly controlled during the design process of RAP fine separation.
road engineeringrecycled asphalt pavementsup-20fine separation of materialsroad performance
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