Compound high modulus asphalt concrete bridge deck structure and arrangement method

Abstract

The invention discloses a compound high modulus asphalt concrete bridge deck structure and an arrangement method, and relates to the field of bridge construction. The structure comprises a cement concrete bridge deck after pellet blasting treatment, a waterproof binding layer, compound high modulus asphalt concrete, an emulsified asphalt binding layer, a wearing layer and the like. The waterproof binding layer is a waterborne epoxy asphalt waterproof binding layer, can form an irreversible and infusible space network system after being solidified, have anti-shearing performance, good permeability and the function of bridge deck slab microcrack restoration and be good in workable performance and endurance quality, and can be constructed at the room temperature; the compound high modulus asphalt concrete can connect the modulus between the cement concrete bridge deck and the wearing layer evenly, be good in waterproof effect, low in void content, and good in workable performance and interlayer binding effect, and have a suspending-compact structure and a compact surface rolled by a rubber wheel. Besides, the improved structure and arrangement method further have the advantages of the simple structure, convenient construction, reasonable force, the good waterproof effect, high high-low temperature stabilization, excellent endurance quality and the like.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a composite high modulus asphalt concrete bridge deck structure and a setting method. Background technique [0002] Asphalt concrete is generally set on the cement concrete pavement layer on the main structure of the bridge to play the role of driving comfort, reducing noise and protecting the main structure of the bridge. However, due to the particularity of the bridge structure, the asphalt concrete on the bridge deck is more prone to damages such as looseness, potholes, ruts, shifting, and wrapping than ordinary roadbed asphalt concrete, which not only affects the driving comfort of vehicles, but also easily induces Traffic accidents and damage to the main structure of the bridge. Existing studies have shown that, in addition to construction defects, the main reasons for the damage of asphalt concrete on bridge decks are: first, the interface between the layers of asphalt c...

AI Technical Summary

Problems solved by technology

However, due to the particularity of the bridge structure, the asphalt concrete on the bridge deck is more prone to damages such as looseness, potholes, ruts, shifting, and wrapping than ordinary roadbed asphalt concrete, which not only affects the driving comfort of vehicles, but also easily induces Traffic accidents and resulting damage to the main structure of the bridge

Existing studies have shown that, in addition to construction defects, the main reasons for the damage of asphalt concrete on bridge decks are: first, the interface between the layers of asphalt concrete and the bond between the asphalt concrete and the cement concrete on the main structure of the bridge is insufficient, resulting in shear failure. Second, stress cracks in asphalt concrete cause water damage; third, the difference in stiffness ratio between asphalt concrete and cement concrete on the main bridge structure causes delamination; fourth, temperature influence and asphalt aging, etc.

[0003] At present, the double-layer SMA asphalt concrete structure is generally used on the cement concrete bridge deck, which is better than the traditional AC structure. However, some outstanding problems have been found in the actual operation process, especially under the double-layer SMA asphalt concrete. The durability of the pavement layer and the cement concrete pavement layer: First, SMA is a typical granular material. Although the anti-rutting performance is excellent, the board body is poor, and the overall waterproof effect of asphalt concrete cannot be achieved; the second is that SMA is a skeleton structure, the surface is rough, and the bonding effect between the lower layer and the waterproof adhesive layer is poor; third, because the wind speed of the bridge deck is higher than that of the roadbed, the temperature of the asphalt concrete is cooled quickly during construction, and the rolling is difficult and prone to unevenness, resulting in uneven thickness of the lower layer. 1. It is difficult to meet the design requirements for local segment compaction and water seepage coefficient, which affects the durability of the double-layer SMA asphalt concrete structure

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