Semi-flexible heavy-duty pavement paving structure

Abstract

The invention relates to a semi-flexible heavy-duty pavement paving structure. The semi-flexible heavy-duty pavement paving structure comprises a surface layer having a thickness of 4-6cm and made of a high-viscosity modified asphalt mixture of SMA-13 or SMA-16, a middle surface layer having a thickness of 6-10cm and made of a high-modulus asphalt mixture of AC-EME14 or AC-EME20, a lower surface layer having a thickness of 10-12cm and made of a low-grade asphalt mixture of ATB-25 or ATB-30, and a semi-flexible base layer having a thickness of 6-12cm and made of skeleton solid cement-emulsified asphalt concrete; a high-viscosity modified asphalt bonding layer is arranged between the surface layer and the middle surface layer, between the middle surface layer and the lower surface layer and between the lower surface layer and the semi-flexible base layer, and the spreading quantity of the high-viscosity modified asphalt bonding layer per unit area is 0.6-0.8kg / m<2>; and an ES-2 modified emulsified asphalt slurry is arranged between the semi-flexible base layer and a bottom base layer, and has a suitable thickness of 6-10mm. The structure improves the rut resistance and the fatigue resistance of a pavement, and prolongs the service life of the pavement.

Description

Technical field [0001] The invention relates to the field of road engineering, in particular to a semi-flexible heavy-load pavement structure. Background technique [0002] With the rapid development of high-grade highway construction in my country, semi-rigid bases have gradually become the mainstream mode of pavement structure design due to their excellent bearing capacity and low cost. However, after decades of construction and vehicle operation inspections, it has been proved that this kind of pavement structure is brittle, has poor internal drainage performance, poor resistance to deformation, and is more 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, heavy load and overload, and most asphalt surface layers are thinner, the active road surface is damaged very seriously before the design period. In the design of high-...

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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 wrap the mineral material of the parent asphalt mixture indirectly, and cannot interweave well with the asphalt mortar 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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