Study On The Performance Of Binding Course And Mechanical Analysis Of Epoxy Asphalt Pavement On Steel Deck

With the sustained and rapid economic development, long-span steel in our country is more and more widely used. The quality of the steel bridge deck pavement has played a significant role in ensuring a good driving environment. Currently, Pavement of steel bridge deck has become the focus of long span steel bridge research. Asphalt Paving is difficult to meet requirements due to complex deformation and force in steel bridge. Epoxy asphalt concrete with high strength, fatigue resistance, etc., has been gradually applied to the country’s steel deck pavement, but epoxy asphalt concrete also has disease problems, like cracking, delamination, drums and other problems in the use process. Steel bridge deck pavement bonding layer is the key to the structure of the system, but there is a lack of unified testing evaluation method for asphalt pavement epoxy bonding interface and microstructure also lacks of in-depth study. Steel Deck Epoxy Asphalt Pavement Structure has a lot of work, but the finite element cell size, load loading, cross slope affect issues, etc. lack of research. In this paper, the following research work carried out the pavement structure mechanical calculations and the adhesive layer problems.(1)Take the Orthogonal Test design for figuring out the mechanical properties of the epoxy adhesive layer TAF, through the shearing and pull-out test to evaluate sensitivity of bonding performance of the three factors(adhesive layer thickness, loading rate, temperature). Establish the relationship between the shear and pull-out strength of the adhesive layer.(2)Taking the bonding test between different gradation of pavement and steel plate, and evaluating the effect of gradations to adhesive layer bonding capacity. At the same time, the contact state between different gradations and steel plate through digital image processing is obtained and the relationship between coarse aggregate ratio and interfacial bond strength is work out. Supplemented by microscopic image observation, the distribution of internal epoxy resin is figured out by comparative analysis of interfacial mixture and the contact area mixture.(3)Reasonable model grid size is determined by establishing Humen Bridge pavement numerical model, and comparing the different mesh size effect on the results. And the response of pavement mechanics in different pavement modulus, overloading rate, single/double wheel loading, pavement after cracking are computed.(4)The difference of pavement mechanical response is calculated in the numerical model under cross slope between both sides of the wheel track tracks. There are evidences prove that cross slope will affect mechanical response of pavement based on the different damage phenomenon between both wheel tracks on Humen Bridge.Adhesive layer detection evaluation test showed that the mechanical properties of the adhesive layer is most sensitive to temperature factor. The relationship of Shear and pull-out strength just like conic. The state of coarse and fine gradation pavement contact with steel showed that coarse-gradation has more aggregate directly contact with the steel plate. The test results showed that coarse gradation had lower interfacial bond strength than fine gradation. Mechanical response of Humen bridge pavement with different parameters were analyzed by finite element numerical simulation. And the results showed that cross slope has a certain impact on the mechanical response of Humen bridge pavement.