A Composite Structure for Restraining Reflective Cracks on Old Cement Concrete Pavement and Its Reform Method

Abstract

The invention discloses a composite structure for suppressing reflection cracks of an old cement concrete pavement. The composite structure comprises a base layer, an old cement slab laid on the base layer and an asphalt concrete overlay laid on the old cement slab, and also comprises a multi-scale hybrid-fiber reinforced epoxy asphalt chip seal laid between the old cement slab and the asphalt concrete overlay; the asphalt concrete overlay comprises a lower layer of medium-grained asphalt concrete, a modified emulsified asphalt binder layer and an upper layer of stone mastic asphalt, which are sequentially laid from the bottom to the top. The invention further discloses a reconstruction method of the composite structure for suppressing reflection cracks of an old cement concrete pavement, and the reconstruction method comprises local constraints of steel bar forming, planting of steel bars and completion of the multi-scale hybrid-fiber reinforced epoxy asphalt chip seal. According to the composite structure and the reconstruction method disclosed by the invention, the overall bearing capacity of the pavement which is reconstructed by the old cement slab can be improved, the interlayer bonding force between the old cement slab and the asphalt concrete overlay is effectively increased, the generation of the reflection cracks is suppressed and the condition that the reflection cracks are prevented from extending to the asphalt concrete overlay is avoided.

Description

technical field [0001] The invention belongs to the technical field of road and traffic engineering, and in particular relates to a composite structure for suppressing reflection cracks on an old cement concrete pavement and a reconstruction method. Background technique [0002] Since the 1990s, China has built a large number of cement concrete roads. With the rapid development of national economic construction, the load and density of vehicles on urban roads and national highways are increasing, and heavy loads and overloading are common, resulting in increasingly serious damage to cement concrete pavements. At present, most cement concrete pavements are in the period of overhaul. Adding asphalt concrete pavement on the old cement concrete pavement is the main form of old cement pavement reconstruction, but this kind of composite pavement structure is very easy to cause stress concentration in the asphalt concrete overlay layer above the joint between the old cement concre...

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Problems solved by technology

[0008] The purpose of the present invention is to address the deficiencies in the prior art, and now provides a composite structure and a transformation method for suppressing reflection cracks on old cement concrete pavement, so as to solve the problem that the toughness of the road surface is not strong enough, the overall shear resistance and the overall tensile strength are relatively poor, and the inhibition The effect of reflective cracks is not good, and the waterproof performance is poor. After the formation of reflective cracks, it is easy to cause water damage.

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