Long-life asphalt pavement structure

Abstract

The invention discloses a long-life asphalt pavement structure paved above a soil matrix. The long-life asphalt pavement structure comprises an asphalt surface layer (1), a basement layer (2) and a subbase layer (3), wherein the asphalt surface layer (1) comprises a surface wearing layer (11), a middle surface layer (12) and a lower surface layer (13), the surface wearing layer (11) adopts SMA-13grading asphalt mixture, the middle surface layer (12) adopts Superpave-20 grading asphalt mixture, and the lower surface layer (13) adopts Superpave-25 grading asphalt mixture; the basement layer (2)is a crack-resistant rigid-flexible combined basement layer and comprises a flexible upper basement layer (21) and a semi-rigid lower basement layer (22), the flexible upper basement layer (21) adopts ATB-25 asphalt stabilized macadam, and the semi-rigid lower basement layer (22) is cement stabilized aggregates; and the subbase layer (3) is stabilized type soil. The long-life asphalt pavement structure disclosed by the invention has the advantages that the pavement quality can be greatly improved, and the road service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of flexible pavement structures, in particular to a long-life asphalt pavement structure which slows down the fatigue cracking of asphalt pavement and the reflection cracks transmitted from the base layer to the asphalt surface layer, and avoids the occurrence of reflection cracks. Background technique [0002] Existing high-grade highways usually use asphalt pavement. The asphalt pavement is laid on the top of the soil foundation, and its structure usually includes an asphalt surface layer, a base layer and a subbase layer arranged in sequence from top to bottom. [0003] The structure of the existing asphalt pavement is as described in the Chinese invention patent "Low Cost Environmental Protection and Long-Life Pavement Structure" (application number: 201611085143.2, application date: 2016.1130), including surface layer, upper seal layer, middle surface layer, sticky layer, and lower layer , underseal, s...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patent uses a semi-rigid base layer, which has many advantages, but at the same time has defects such as poor drainage and reflective cracks

[0005] Such a structure makes the existing asphalt pavement prone to fatigue cracking and reflection cracks transmitted from the base layer to the asphalt surface layer. Such as cracks, water damage, rutting, etc., far from the design life of the road

[0006] However, a single flexible base layer has a large deformation, and its own damage is mainly caused by repeated loads. When the accumulated residual deformation reaches a certain value, the pavement will have subsidence or rutting defects.

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