Asphalt mixture for color porous pavement upper layer and preparation method

Abstract

An asphalt mixture for a color porous pavement upper layer and a preparation method are disclosed. The asphalt mixture comprises following raw materials: decolorized asphalt, aggregate having a size of 3-5 mm, aggregate having a size of 5-10 mm, composite modified mineral powder, particle lignin fibers and iron oxide red. The asphalt mixture is prepared mainly by dispersing the particle lignin fibers in a manner of blending all the small-particle-size aggregate (3-5 mm) and a part of the large-particle-size aggregate (5-10 mm), and mixing the composite modified mineral powder with raw materials. The asphalt mixture has functions integrating water permeability and beauty, and is proved by related performance index tests to have good pavement performance and durability. The asphalt mixture is of great significance to construction of a sponge city water-permeable system, and the construction goal of benign hydrological cycles and ecological energy conservation.

Description

Technical field: [0001] The invention belongs to the technical field of road engineering, in particular to an asphalt mixture for the upper layer of colored permeable pavement and a preparation method thereof. Background technique: [0002] Most of the traditional asphalt or cement concrete pavement adopts an impermeable structure, and surface runoff water directly flows into the urban drainage system, which not only intensifies the urban drainage pressure, but also prevents rainwater from directly infiltrating into the ground, seriously affecting its utilization efficiency; at the same time, rainwater flows through the road When it gathers in the drainage system, it will dissolve into some other impurities to pollute it and cause new damage to the ecological environment. Secondly, because the rainwater cannot be discharged from the road surface in time, a large amount of rainwater stays on the road surface, and phenomena such as "drifting" and "glare" are prone to occur dur...

AI Technical Summary

Problems solved by technology

However, the current permeable asphalt pavement has the following problems: the water permeability of the permeable pavement cannot meet the road surface requirements for timely drainage of rainwater, resulting in rainwater accumulation, which affects the service life of the permeable pavement; the color surface layer is easy to fade after a long service time, etc.

However, no research has been conducted on the angular wear of aggregates during the mixing process and the impact on the mechanical properties of asphalt mixtures for permeable pavements.

[0005] In the current prior art, although asphalt modifiers have been used to prepare permeable asphalt mixtures, the cost is relatively high, and the color of the prepared asphalt mixtures is single, which is the traditional "black road surface", and a single limestone mine is mostly used. Powder or slaked lime etc. are used as the filler of the permeable asphalt mixture; the colored asphalt pavement in the prior art has poor color durability on relatively busy roads, and the friction between the tire and the road surface during the running of the vehicle will cause the paint to fall off, and the daily sunlight The aging of asphalt binder due to irradiation, dust stains, etc. will cause the asphalt pavement to fade, and the service life will be short. At the same time, the preparation method of permeable asphalt mixture will also have a great impact on its performance.

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