Semi-flexible pavement base material and preparation method thereof

Abstract

The invention relates to a semi-flexible pavement base material and a preparation method thereof. The semi-flexible pavement base material comprises 20-75% of an aggregate, 22-75% of cement-emulsified bitumen mortar and 1-8% of water. Through adjustment and optimization of composition and compatibility of the cement, emulsified bitumen and aggregate, an adhesion state and a molded structure of the cement, emulsified bitumen and aggregate are improved so that the semi-flexible pavement base layer structure has ideal rigidity and flexibility, rutting resistance and cracking resistance of the semi-flexible pavement base layer structure are improved and water damage resistance and fatigue resistance of the semi-flexible pavement base layer structure are improved. The semi-flexible pavement base material and the preparation method thereof are mainly used for building and refurbishment of high-grade roads and urban roads and are especially suitable for easily-rutted road sections such as heavy-loaded traffic roads, road intersections, uphill and downhill of a road, a bus stop and a bus transit lane.

Description

technical field [0001] The invention relates to road paving materials, in particular to a semi-flexible pavement base material and a preparation method thereof. Background technique [0002] With the rapid development of high-grade highway construction in my country, the semi-rigid base course has gradually become the mainstream mode of pavement structure design due to its excellent bearing capacity and low cost. However, after decades of construction and driving operation inspections, it has been proved that this kind of pavement structure is brittle, with poor internal drainage performance, poor deformation resistance, and is sensitive to changes in ambient temperature and humidity. It is prone to cracks and gradually penetrates upwards, causing reflections. crack. At the same time, due to the current increasing traffic volume, serious overloading and overloading, and the thinner thickness of most asphalt pavements, the active pavement will be seriously damaged in the ear...

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Problems solved by technology

However, this poured semi-flexible pavement structure also has its shortcomings: ① It is difficult to ensure the continuity of the voids of the open-graded parent asphalt mixture, so it is difficult to fully fill the voids of the open-graded parent asphalt mixture with cement mortar ; ②The cement mortar can only indirectly wrap the mineral material of the parent asphalt mixture, and cannot interweave well with the asphalt binder and finally form a uniform spatial network structure, resulting in the gap between asphalt, cement mortar and aggregate. The interface adhesion is not good

However, the fluidity of these two kinds of mortars is relatively small, and it is easy to segregate when used in semi-flexible pavement base materials, and it is difficult to form uniformly. lower

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