Analysis And Experimental Study On The Mechanical Properties Of Asphalt Concrete Bridge Deck Pavement

Bridge structure with its beautiful and fast characteristics has became more and more popular in modern highway traffic construction. Asphalt concrete bridge deck pavement structure conducts as an important part of the bridge superstructure, that is not only can be used to spread the role of vehicle load but also be a protective layer to avoid the harmful material such as water erosion of the lower structure. In recent years, the overload phenomenon appeared increasingly severe with frequent extreme weather conditions, so asphalt concrete pavement is easy to appear the early diseases such as cracking and rutting which gives birth to great economic loss as well as produces a series of negative social effect. So the mechanical properties of cement concrete bridge asphalt concrete pavement structure to determine the main mechanics indexes affecting its performance, on the basis of targeted select pavement material has obvious practical significance.In this paper, by using the Ansys finite element software, mainly for the following analysis:(1) Choose the typical semi-rigid asphalt pavement structure, as the deflection under different inter-layer contact state, the maximum principal stress and maximum shear stress and axial load change on the influence law of the mechanics index.(2) On the basis of existing asphalt concrete pavement structure survey statistics, combined with relevant literature to establish simplified model of the bridge deck pavement structure; First contact model and continuous model of maximum principal stress and maximum shear stress of asphalt concrete layer, waterproof layer interface maximum shear stress under different temperature conditions and the structure of the internal temperature field and thermal stress distribution; Second study axial load and horizontal force, asphalt concrete pavement structure parameters, the waterproof layer, concrete leveling layer parameter change on the influence of the main mechanical indicators.(3) Comparison analysis of semi-rigid asphalt pavement with asphalt concrete bridge deck pavement structure main mechanics indexes; On the basis of the choice of polypropylene anti-crack fiber and PRCR two kinds of asphalt concrete additives, the water resistance, high and low temperature resistance of asphalt concrete and interlayer performance test.In the above calculation analysis and road performance test, based on the study, said: In close to continuous model of the structure of the integrated performance of asphalt pavement and asphalt concrete bridge deck pavement have improved significantly; To shear performance and temperature stress as the main control index of asphalt concrete bridge deck pavement; PRCR and polypropylene anti-crack fiber effect on the improvement of the asphalt concrete is higher than that of ordinary modified asphalt concrete, PRCR improvement effect is superior to polypropylene anti-crack fiber.