Long-life cement concrete bridge multi-medium waterproof composite layer

Abstract

A long-service-life cement concrete bridge multi-medium waterproof composite layer is characterized in that a waterproof bonding composite layer is sequentially composed of a bi-component adhesive layer and a rubber modified asphalt layer outwards along a bridge floor, single-particle-size broken stones are inserted between the bi-component adhesive layer and the rubber modified asphalt layer in a penetrating mode, the bi-component adhesive layer is formed by bi-component bonding materials, and the rubber modified asphalt layer is formed by the bi-component bonding materials. The rubber modified asphalt layer is formed by rubber modified asphalt, the rubber modified asphalt layer, the bi-component bonding material, the rubber modified asphalt and the single-particle-size gravel are constructed synchronously, and according to the spreading amount, the content of the bi-component bonding material is 1.0-1.5 kg / m < 2 >, the content of the rubber modified asphalt is 1.6-2.0 kg / m < 2 >, and the coverage rate of the single-particle-size gravel is 60-70%. The waterproof composite layer material disclosed by the invention has outstanding waterproofness, durability, bonding strength and shearing strength, and can be well applied to bridge deck pavement of a cement concrete bridge, so that the service life of the concrete bridge deck is prolonged.

Description

technical field [0001] The invention belongs to the technical field of bridge deck paving materials, in particular to a long-life cement concrete bridge multi-media waterproof composite layer. Background technique [0002] The waterproof bonding layer is an important functional layer to ensure that the asphalt concrete pavement and the cement concrete bridge deck work together. Its function is not only to firmly bond the pavement layer and the bridge deck to ensure the coordination of deformation and the overall bearing capacity of the two, but also to prevent moisture from penetrating into the concrete bridge deck structure. Serious early damage phenomena of bridge deck pavement, such as asphalt layer shifting, exposed bridge deck, cracking, etc., have appeared in many concrete bridge actual projects. The survey found that most of these diseases are caused by the failure of interlayer bonding. [0003] The commonly used waterproof bonding layer for concrete bridge deck pa...

AI Technical Summary

Problems solved by technology

This is because, from the point of view of the concrete bridge deck pavement system, the elastic modulus of the asphalt concrete pavement layer and the cement concrete slab differs by tens of times, while the elastic modulus of the existing bonding course materials is small, and they are different from the concrete slab The bonding strength between them is low, and the single-layer structure is difficult to ensure the coordination of stress and strain of the entire pavement system under load.

Images