A method of stripping fine aggregate from the surface of waste asphalt mixture aggregate

Abstract

The invention discloses a method for stripping fine aggregate from the surface of waste asphalt mixture aggregate. The method comprises the following steps: freezing RAP to -40 DEG C to -10 DEG C; feeding the RAP coarse aggregate into special centrifugal equipment for centrifugal treatment, so that an asphalt film on the surface of the RAP coarse aggregate and an asphalt mass formed by asphalt andpowder fall off under the action of collision and friction; then feeding the RAP to a vibrating screen to be screened, so that the RAP forms a waterfall shape on a material distribution device at a feeding hole of the vibrating screen; blowing the RAP to be spread, in a waterfall-like shape, on the screen surface of the high-frequency vibration mesh screen through the blower device, sieving the aggregate with the particle size larger than 1.18 into three blocking materials with the particle size larger than or equal to 4.75 mm, 4.75 mm-2.36 mm and smaller than or equal to 2.36 mm through thehigh-frequency vibration mesh screen, wherein fine materials with the particle size smaller than or equal to 1.18 mm are blown into the dust removal system. According to the method disclosed by the invention, the asphalt film on the surface of the RAP and the asphalt mass formed by the asphalt and the fine powder can be effectively separated, the grading quality of the added RAP mixture is favorably controlled, the secondary aging of the old asphalt is reduced, and the adding proportion of the recycled RAP is improved.

Description

technical field [0001] The invention relates to the technical field of road engineering materials, in particular to a method for stripping fine aggregates from the surface of waste asphalt mixture aggregates. Background technique [0002] In recent years, in order to respond to the national requirements of "building a conservation-oriented society" and "developing a circular economy", coupled with the increase in the price of petroleum and stone resources, road departments in various places have taken active actions, with the aim of "sustainable development" , with the goal of developing "green transportation", the recycling and reuse of old road asphalt materials has been re-emphasized and paid attention to. Many scientific research institutions and research institutions have begun to study and promote the recycling technology of old road asphalt materials. [0003] According to the requirements in my country's 12th and 13th Five-Year Plans, RAP should achieve "zero waste"...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method for stripping fine aggregate from the surface of waste asphalt mixture aggregate, the main purpose of which is to overcome the asphalt film formed by asphalt and powder in the existing RAP or the adhesion of fine aggregate and coarse aggregate Difficult to separate together, RAP gradation is difficult to control, resulting in a large number of RAP can not be reused and other shortcomings

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