Cement concrete road structure with pervious isolating filter layer and combined layer and its construction method

Abstract

The road structure of the present invention includes a base layer, a pervious isolating filter layer, a wire mesh or fabric combined layer and a cement concrete face layer spread successively. It is constructed by spreading the other mentioned layers successively onto the rolled and leveled base layer. It is easy to construct and low in cost and the cement concrete road has high fracture strength and anti-fatigue strength, high bearing capacity, and other advantages.

Description

1. Technical field [0001] The invention relates to new cement concrete pavement technology, in particular to a cement concrete pavement structure and a construction method provided with a permeable filter slurry isolation layer and a bonding layer. 2. Background technology [0002] Cement concrete pavement is one of the most important pavement structures of airports and roads. The one-time investment of cement concrete pavement is huge, and maintenance is difficult. Once it is damaged, it will cause huge losses. Fracture damage is the most important failure form of cement concrete pavement, and it is also the main reason for restricting the development of cement concrete pavement. [0003] The traditional cement concrete pavement model assumes that the cement concrete surface layer and the base layer are in smooth contact, that is, on the contact surface, the displacement and normal force of the surface layer and the base layer along the normal direction are equal, and there...

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Problems solved by technology

[0004] However, when the cement concrete pavement is newly built according to the current method, the cement concrete is directly poured on the base or the surface of the roadbed, which causes a huge difference between the actual pavement structure and the ideal model of the pavement. The analysis of the cement concrete pavement damage process shows that, This difference is an important reason for pavement damage. This is because: first, the pavement design model idealizes the contact surface between the pavement and the base or subgrade as a smooth contact surface. On the smooth contact surface, the surface and the base can interact with each other. Sliding, but the actual contact surface is uneven, which greatly prevents the free shrinkage and temperature deformation of the concrete, so that the concrete surface layer often produces cracks due to the shrinkage deformation and temperature deformation of the concrete itself; second, the actual concrete surface layer is poured in On the base layer, the growth law of concrete strength at the bottom of the surface layer is affected by many factors, which is different from the strength growth law of the laboratory standard specimen. The flexural strength and flexural fatigue strength of the laboratory concrete standard specimen are used as the control concrete surface The design index of cracking is very different from the actual situation; third, the pavement design model assumes that the surface course and the base (or roadbed) above and below the contact surface are intact, but the actual situation is that after pouring concrete directly on the base, due to When cement mortar penetrates into the base layer or roadbed, a transition layer will inevitably be formed between the surface layer and the base layer (or road base). In the early stage after concrete pouring, the surface layer and the base layer are connected together through the transition layer, and they cannot slide each other. The shrinkage of the concrete, temperature deformation and load will eventually lead to the destruction of the transition layer and the separation of the surface layer and the base layer. After the separation, the surface layer and the base layer are seriously damaged on the upper and lower surfaces of the contact surface, and there are a large number of defects. And surface cracks, such defects and surface cracks will cause fracture damage and fatigue damage of the concrete surface layer at low stress levels, so the assumption that the surface layer and the base layer are intact near the contact surface is greatly different from the actual situation

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