Ultra-thin wearing layer of pavement

Abstract

The invention belongs to the technical field of a building material used in road engineering, and specifically relates to drainage asphalt mixture for an ultra-thin wearing layer. The mixture comprises aggregated material, stuffing, high-performance asphalt and warm mixing additive; the maximal nominal size of the mixture is 6.7mm; the thickness of a pavement layer is 10-20mm; the aggregated material is basalt or dolerite; the used stuffing is mixture of limestone powder and common silicate cement, and the used high-performance asphalt is prepared from general modified asphalt by adding waste tire rubber powder which is 20-28% of weight of the asphalt and modifying. An ultra-thin finishing coat and low-temperature construction are realized by the asphalt mixture by adding the warm mixing additive; the ultra-thin wearing layer has the advantages of low construction cost, convenience in construction and the like, and is suitable for building of an asphalt concrete pavement and function-improving works of the pavement.

Description

technical field [0001] The invention belongs to the technical field of building materials used in road engineering, and in particular relates to an asphalt mixture used for ultra-thin wearing layers. Background technique [0002] Previous pavement structures mainly include 150-300mm cement concrete pavement paved with penetration or surface treatment technology, 40-60mm asphalt concrete pavement, etc. These pavements generally have poor performance, high cost or high maintenance frequency, and maintenance costs advanced questions. At present, the use of an ultra-thin wear layer with a pavement thickness of 20mm to 25mm can solve the problems of slight cracks, looseness, slight rutting, poor surface oil, aging, and attenuation of anti-skid performance on the pavement. It can be used as an anti-skid layer for new pavements, and it is one of the more effective preventive maintenance techniques at present. Due to the thin pavement thickness, it will withstand the test of relat...

AI Technical Summary

Problems solved by technology

Due to the thin pavement thickness, it will withstand the test of relatively severe traffic, environmental and other factors during use. It is often necessary to use high-performance modified asphalt materials. The cost is lower than the traditional 40mm overlay scheme, but overall it is not significant

Moreover, for preventive maintenance projects, when adding 20mm to 25mm pavement, it is often necessary to overlay the entire section to ensure the safety of longitudinal driving on the road surface, and it is difficult to be targeted during project implementation

[0003] Generally, the thinnest ultra-thin wear layer can only reach a thickness of 20mm. In order to popularize and apply the ultra-thin wear layer technology, the limit of 20mm must be broken through. Therefore, it is imperative to study and apply the ultra-thin wear layer technology with a smaller thickness.

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