FRP-SMA steel bridge deck pavement structure

Abstract

The invention discloses an FRP-SMA steel bridge deck pavement structure. The structure is composed of an FRP pavement protection layer and an SMA pavement wearing layer which are laid from bottom to top. The top face, facing the SMA pavement wearing layer, of the FRP pavement protection layer is provided with convex-edge matts-shaped shear keys; and the thickness of the SMA pavement wearing layer embedded into the matts of the FRP pavement protection layer is a thermosetting SMA thin layer, and the rest thickness is a thermoplastic SMA thin layer. According to the present invention, the convex-edge matts-shaped shear keys of the FRP pavement protection layer can restrain the SMA mixture to drive the interface bonding resin to slide during the SMA pavement wearing layer construction so as to ensure the interface connection quality, and can provide the synergistic effect with the thermosetting SMA thin layer of the SMA pavement wearing layer so as to enhance interface shear connection in the transverse bridge direction and the longitudinal bridge direction after the SMA wearing layer molding, so that the structure form is more reasonable, structural stress is safer, design and construction quality is more controllable, engineering cost is more economical, the two technical problems which are difficult to solve in the asphalt concrete steel bridge deck pavement structure can be solved, and the technical and economic levels of flexible steel bridge deck pavement are remarkably improved.

Description

technical field [0001] The disclosure relates to the technical field of bridge engineering, in particular to a fiber-reinforced composite (English name: Fiber Reinforced Polymer, English abbreviation: FRP) pavement protection layer and modified asphalt mixture for a bridge engineering flexible steel bridge deck pavement system (Also known as modified asphalt mastic macadam mixture, English name: Stone Matrix Asphalt, English abbreviation: SMA) The pavement wear layer is composed of the pavement structure layer, and the FRP pavement protection layer is also used as the pavement functional layer The new FRP-SMA steel bridge deck pavement structure. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may constitute prior art. During the process of realizing the present invention, the inventors have found at least the following problems in the prior art. [0003] The technical status of my cou...

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Problems solved by technology

[0003] The technical status of my country's asphalt concrete steel bridge deck pavement, on the one hand, after more than 30 years of development, "double-layer epoxy asphalt mixture (EA protective layer + EA wear layer)" and "double-layer modified asphalt mixture ( SMA protective layer + SMA wear layer)", "cast asphalt mixture + modified asphalt mixture (GA protective layer + SMA wear layer)", "cast asphalt mixture + epoxy asphalt mixture (GA protective layer + EA wearing layer)" four kinds of pavement structure forms with relatively mature technology and their design and construction technology, engineering application shows the unique advantages of flexible pavement structure in vibration reduction, noise reduction, water permeability, anti-skid and driving comfort; another On the one hand, these four pavement structures were formed by introducing foreign technology, and the two major technical problems of "weak interface connection" and "poor structural durability" that have existed since the day of their formation have not been solved, which restricts the flexible steel bridge deck. The technical and economic level of paving has been improved

[0004] The main reasons for the "weak interface connection" and "poor structural durability" of the four asphalt concrete steel bridge deck pavement structures are the pavement structure layers (from top to bottom: pavement wear layer, pavement protection layer) under the pavement layer) has more layers (from top to bottom: asphalt mortar buffer layer, waterproof adhesive layer, steel plate anti-corrosion layer) and the interface connection between layers is weak (pavement waterproof adhesive layer) The interface between the layer and the anti-corrosion layer of the steel plate has the weakest shear connection), making it easy to be damaged by force at the interface of these weak functional layers [1 -3], resulting in the loss of the structural integrity of the pavement structure and the steel bridge deck and the failure of the pavement structure to the steel bridge deck's waterproof and anti-corrosion effects, resulting in a reduction in the structural durability of the pavement structure and the steel bridge deck

Experimental inspection and actual bridge engineering inspection found that this structural form is prone to delamination and slip damage at the interface between SMA pavement surface and FRP pavement base at high temperature, indicating that the structural form of the full-thickness thermoplastic structural layer is not SMA pavement surface reasonable structural form

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