A kind of colored permeable pavement upper layer asphalt mixture and its preparation method

Abstract

The invention discloses an asphalt mixture for the upper layer of colored permeable pavement and a preparation method thereof. The asphalt mixture involved in the invention includes the following raw materials: decolorized asphalt, 3-5mm aggregate, 5-10mm aggregate, composite modified mineral powder, particles Lignin fiber, iron red; mainly disperse granular lignin fiber by mixing all small particle size aggregates (3-5mm) and some larger particle size aggregates (5-10mm), and use composite modified ore The asphalt mixture is prepared by mixing powder and raw materials; the asphalt mixture has the functions of water permeability and aesthetic integration, and it has been proved by relevant performance index tests that it has good road performance and durability. "It is of great significance to realize the construction goals of benign hydrological cycle and ecological energy saving.

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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