Large-particle-size aggregate core wall asphalt concrete and mix proportion optimization method thereof

Abstract

The invention discloses a large-particle-size aggregate core wall asphalt concrete which is screened out through a square hole screen with the side length of screen holes being 37.5 mm, the thicknessof an asphalt film of the asphalt concrete is 6.748-8.688 microns, the grading index is 0.42-0.48, the use amount of a filler is 10%-12%, and the use amount of asphalt is 5.5%-6.1%. The invention further discloses a proportion optimization method of the large-particle-size aggregate core wall asphalt concrete. According to the asphalt concrete, large-particle-size aggregate is adopted; the arge-particle-size aggregate core wall asphalt concrete is high in strength, high in deformation adaptability and obviously low in asphalt consumption, the construction efficiency is improved, engineering investment is saved, test data obtained through a large test piece and the PPR technology are utilized, the optimal asphalt film thickness is introduced to serve as the evaluation standard, and the problem that optimization cannot be achieved without experience depending on the increase of the mix proportion of aggregate is solved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic core wall asphalt concrete material and its processing and preparation, and in particular relates to a large particle diameter aggregate core wall asphalt concrete and a method for optimizing its mixing ratio. Background technique [0002] The maximum particle size of coarse aggregate stipulated in the code for design of asphalt concrete face and core wall of earth-rock dams in my country is not more than 16-19mm. This is mainly because the design idea of ​​asphalt concrete for road traffic pavement is followed. Generally, the thickness of road asphalt concrete surface layer is 10cm It is about 3 to 5 times the maximum particle size of the aggregate, so the maximum particle size of the asphalt concrete aggregate for road traffic pavement is selected at 19mm. [0003] "Code for Design of Asphalt Concrete Face and Core Walls of Earth-rock Dams" (SL501-2010) stipulates that the maximum particle size...

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Problems solved by technology

[0007] Another object of the present invention is to provide the optimal method for the proportioning of the above-mentioned asphalt concrete, utilize the test data obtained from the large test piece, PPR technology and refer to the best asphalt film thickness as the evaluation standard, and solve the problem that the proportion of asphalt increases with the aggregate. Experience depends on difficulties that cannot be optimized

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