Causes Analysis Of Early Distresses And Design Method Of Asphalt Concrete Pavement For Concrete Bridge Deck

In recent years, some prevaling distresses occurred on the bridge deck pavement with the increasing of the traffic volume,heavy vehicle and overload incidents, which influence traffic seriously, cause great trouble to maintenance and huge economic loses. The premature deteriorations of bridge deck pavement have become a widespread concern due to their influences on the expressway function and the development of long-span bridges. A series of standard specifications for design and construction of the bridge deck pavement must be established as early as possible through the study on the key technical problems existing in the theory and practice.In this paper, the causes are analyzed according to the main failure types of bridge deck pavement and the indexes for its design are presented on the basis of the study achievements both home and abroad. This paper analyzed the mechanical properties of the pavement on the simply supported slab bridge under horizontal and vertical loads with ANSYS and the influences of the loading location, modulus of elasticity and thickness of the pavement are discussed in detail. The mechanical properties of the pavement are well known and provide the theoretical basis for establishing codes. Through the mechanical analysis, the main factors influencing the pavement are determined and this paper provides fundamental references to exactly modeling for mechanical analysis henceforth. Based on the conclusions and combined with the considerations of rut depth, roughness etc., the design method of asphalt concrete pavement for concrete bridge deck is presented with reference to the design of highway asphalt pavement.