Abstract
To improve the structural design rationality of cement concrete bridge deck pavement systems and reduce diseases such as interlayer displacement and rutting in the early stage of bridge deck use, this paper studies the influence and law of the coupling effect of various factors of the waterproof system on the typical stress of bridge deck pavement and determines the best structure combination for the bridge deck pavement structure. A finite element model was established by using commercial software to simulate the mechanical response of different types of waterproof bonding layer, waterproof leveling layer, and impervious structure layer under different parameters. The simulation results show that when the thickness of the pavement layer was 8 cm, the maximum shear stress of the pavement layer occurred in the middle of the wearing course and the junction between layers. When the pavement layers were continuous, the maximum strain of the waterproof bonding layer with the “rubber asphalt + protective plate” structure in the transverse and longitudinal directions was the largest. When the waterproof leveling layer was cement concrete, the structure bore a large amount of stress and easily produced cracks, resulting in water damage. High-density water-based asphalt concrete with a low permeability coefficient can reduce the interlayer shear stress and effectively ensure the interlayer bonding effect. On this basis, the following bridge deck pavement structure was proposed: waterproof system + multifunctional waterproof layer + load-bearing structure layer + surface functional layer.
Highlights
In the transportation industry, an asphalt mixture is often used as the pavement material of cement concrete bridge decks [1]
Aiming to study the bridge deck pavement structures in the frozen areas of North China, combined with the concept of multi-level waterproofing in the bridge deck pavement structure’s design, this paper studied the influence law of various factors, such as waterproof layer modulus, waterproof system structure type, and material permeability, on the typical stress of bridge deck pavement under four kinds of waterproof bonding layers, two kinds of waterproof leveling layers, and eight kinds of structural combinations of the pavement structure
The main conclusions are as follows: (1) When the thickness of the pavement layer was 8 cm, the maximum shear stress of the pavement layer occurs at 2 cm and 4 cm, that is, the middle of the wearing course and the connection between layers, which suggests that an upper pavement layer with sufficient high-temperature shear resistance should be selected as the load-bearing structural layer in the structural design
Summary
An asphalt mixture is often used as the pavement material of cement concrete bridge decks [1]. Gong et al [27] studied the mechanical responses of concrete deck asphalt pavement under complex load conditions through three-dimensional finite element modeling They found that the temperature field had the most significant impact on the damage to the deck pavement, followed by the driving speed and the radius of curvature. Cheng et al [30] established a viscoelastic model of bridge deck pavement They studied the effects of moving and periodic loads on the mechanical responses of the bridge deck pavement based on finite element software. This study established a finite element model of bridge deck pavement by using ANSYS software, analyzed and calculated the influence law of different interlayer connection states, load characteristics, pavement thicknesses, and moduli of four kinds of waterproof bonding layers on the typical stress of bridge deck pavement, and compared the stress states of two kinds of waterproof leveling layers.
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