Research on the Effect of Repeated Recycled Aggregate Content on the Performance of Cold-mixed Pavement Repair Material
Polyurethane modified emulsified asphalt technology and cement slurry treatment technology are used to remedy the defects of the second repeated recycled aggregate,which is prepared into cold-mixed recycled aggregate pavement repair material.Through penetration test,cohesion test,rutting test,immersion Marshall test and freeze-thaw splitting test,the effects of repeated recycled aggregate content on the construction and workability,early strength,forming strength and water resistance of cold-mixed recycled aggregate pavement repair materials of modified emulsified asphalt are studied.The results show that when the content of recycled aggregate is more than 50％,the penetration strength of modified emulsified asphalt cold-mixed recycled aggregate pavement increases at first and then decreases with the increase of repeated recycled aggregate content,the initial strength,molding strength and water resistance increase gradually with the increase of the content,and all the properties are better than those of emulsified asphalt cold-mixed recycled aggregate pavement repair material,which ensures that the road surface can be opened to traffic quickly after repairing,and realizes the dual environmental protection goals of energy saving,emission reduction and resource utilization of construction waste.
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