Asphalt concrete for ultra-thin wearing course with easily-compactable skeleton and thickness of 1 to 1.5 cm

Abstract

The invention relates to asphalt concrete for an ultra-thin wearing course with an easily-compactable skeleton and a thickness of 1 to 1.5 cm. The ultra-thin wearing course is characterized by comprising an upper asphalt concrete layer and a lower high-viscosity modified emulsified asphalt bonding layer, wherein the laying thickness of the upper asphalt concrete layer is 1.0 to 1.5 cm, and a proper spraying amount of the lower layer is 0.8 to 1.0 kg / m<2>. The mixture for the ultra-thin wearing course forms a skeleton-compact ultrathin pavement and enables the pavement to have good stability, durability and safety performance. The ultra-thin wearing course is applicable to prevention and maintenance of newly-built pavements and old pavements.

Description

technical field [0001] The invention belongs to the technical field of building materials used in road engineering, and aims to provide a formula and design method of an easy-to-compact ultra-thin wearing layer asphalt mixture, which can effectively reduce the cost of the road surface, facilitate construction, and provide a road surface with excellent performance. It is widely used in the construction of expressways and other high-grade highway surfaces and road surface reconstruction projects. technical background [0002] The ultra-thin wear layer is an ultra-thin upper layer formed by discontinuous semi-open gradation modified hot asphalt mixture, which is paved on the treated road surface. It can solve slight cracks, slight looseness, rutting, and surface water seepage on the road surface , poor oil, aging, anti-skid performance decline and other diseases. Ultra-thin wear courses generally use "fine" asphalt mixtures with a maximum nominal particle size of 9.5 mm or 4.7...

AI Technical Summary

Problems solved by technology

However, the drainage structure will be blocked by sediment after a period of use. If professional cleaning equipment is not used, it is difficult to make the road surface achieve the desired effect, and the maintenance cost of the road surface is relatively high.

In recent years, the application of UTAC, SAC and SMA grades, which are relatively common in China, in thin-layer overlay projects, asphalt mixtures with dense skeleton structures, is difficult to control in actual construction, and the degree of compaction is difficult to guarantee.

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