A construction method of in-situ cold recycling of a multi-state asphalt of a road asphalt pavement surface layer

Abstract

The application discloses a construction method of multi-state asphalt for cold in-place recycling of a road asphalt pavement surface layer, which sprays foamed asphalt, emulsified asphalt, normal-temperature recycling reinforcing agent and performance accelerant in a recycling equipment mixing bin at the same time, performs milling and mixing, improves the defects of point contact and uneven wrapping of the binder and the aggregate caused by the pure use of foamed asphalt, improves the early strength weakness and long curing cycle of the pure use of emulsified asphalt, improves the early strength weakness, long curing cycle and large VOCs gas emission defects of the pure use of liquid asphalt, and the emulsified asphalt or liquid asphalt can improve the distribution uniformity of the binder, improve the wrapping of the binder to the aggregate, and improve the overall construction workability. In addition, in order to increase the interlayer adhesion and waterproof of the recycling layer and the original layer, the synchronous spraying of the tack coat emulsified asphalt is performed. The performance accelerant can increase lubricity, improve permeability, be used for improving the binding force of the binder and the old material, improving the early strength, shortening the curing time, and improving the construction workability.

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