Rubber powder modified asphalt macadam bridge surface waterproof layer and construction method

Abstract

The invention relates to a rubber powder modified asphalt gravel bridge deck waterproof layer and a construction method thereof. The bridge deck waterproof layer of the invention is arranged between a bridge cement concrete paving layer and a bridge deck asphalt paving layer, and the bridge deck waterproof layer consists of a signal particle diameter gravel layer, a rubber powder modified asphalt layer, and an interlayer interface connection layer from top to bottom. The cement concrete paving layer is gigged and cleaned clearly during the period of construction, and then the interlayer interface connection material, the rubber powder modified asphalt and the signal particle diameter gravel are sprayed sequentially. After the rubber-tyre rolling and health preservation, the traffic can be open to the construction vehicles or the construction of the bridge deck asphalt paving layer starts. The bridge deck waterproof layer of the invention has the advantages of good waterproof effect, high interlayer cohesive performance, good high-temperature stability, good low-temperature crack resistance and excellent fatigue resistance, and efficient property of absorbing and reducing the interlayer stress.

Description

technical field [0001] The invention relates to the waterproof treatment of highway bridge decks, in particular to a rubber powder modified asphalt gravel deck waterproof layer and a construction method thereof. Background technique [0002] In recent years, paving asphalt concrete surface layer on cement concrete pavement layer of highway bridges has become the mainstream of pavement structure design of high-grade highway bridges in my country. influences. Due to insufficient attention to the asphalt pavement treatment of the bridge deck, some highway bridges suffered early damage soon after they were completed and opened to traffic, which not only affected the aesthetics of the bridge, but also seriously affected the driving safety and the service life of the bridge. economic losses, and increase the difficulty of post-maintenance and maintenance of the bridge. [0003] The early damage forms of the asphalt pavement on the bridge deck can generally be divided into three s...

AI Technical Summary

Problems solved by technology

At the same time, a large number of highway bridges built in my country in the early stage without a bridge deck waterproof layer or bridges that urgently need maintenance and repair in the future are also facing severe challenges.

[0005] At present, my country's existing bridge deck waterproof materials can be divided into four categories: coiled materials, flexible coatings, emulsified asphalt slurry seals and SBS thermally modified asphalt: ① Although the waterproofing effect of coiled bridge decks is good, However, there are high requirements for the base layer, many construction lap joints, poor shear resistance, and poor interlayer bonding; The uniformity is difficult to control, and the anti-breakage ability is poor; ③The emulsified asphalt slurry seal layer bridge deck waterproof layer is a new technology that has been tried in recent years, but this type of bridge deck waterproof layer has poor anti-deformation ability. Under the influence of action, temperature, climate and other factors, when the bridge deflects and deforms, the bridge deck waterproof layer is prone to interlayer damage. At the same time, if the water in the emulsified asphalt cannot evaporate in time during the construction process, air holes are likely to form inside the bridge deck waterproof layer. , the waterproof effect is affected to a certain extent; ④ Although the SBS thermally modified asphalt bridge deck waterproof layer has a good waterproof effect, it is expensive, especially at high temperatures. The shear strength and bonding performance indicators are low

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