Research On FRP-Epoxy Gravel Bridge Deck Pavement Structure

In recent years, the bridge construction has developed rapidly in individual countries; however, the paving layer of some bridges is damaged soon after the bridges open to traffic. With the increase of the traffic and the loads, the deconstruction of the pavement becomes more and more serious, which is not only to affect the normal traffic but also is a waste of lots of manpower and resources for maintenance, inevitably causing huge economic losses for the state and the people. Thus it is of great practical significance to enhance the research on bridge deck pavement. On the base of a large quantity of investigation and analysis about bridge deck pavement diseases and the generalization of achievements in bridge deck pavement at home and abroad, the new type FRP—epoxy gravel pavement structure of bridge deck is developed by the Composite-material Research Group of Chongqing Jiaotong University with the combination of the excellent properties of FRP composite material and its application in bridge project, and hereby the research content are as follows.Firstly, the paper conducts the design and material preparation for FRP—epoxy gravel pavement structure which has many excellent performances such as light weight and high strength, water proofing, corrosion resistance, thermal insulation, non-sliding and wear resistance. The adhesion between FRP bottom plate and bridge deck are so firm that it is able to be waterproof and that extra special waterproof layer is unnecessary, achieving the effect of"one layer with multiple functions".Secondly, in order to ensure the design quality of the pavement structure, a series of basic mechanical property test toward the composition of pavement structure such as FRP top and bottom plate, FRP hollow square tube and the epoxy gravel. The test is carries out respectively for their regular strength, modulus of elasticity, hardness and other basic physical and mechanical properties as well as mechanical properties under saturated water and high temperature. The structural performance test and research is conducted toward the pavement by means of applying flat crush and side pressure, systematically studying the stress, deformation and damage rules of pavement structure. It is concluded from the tests that the paving material is with high strength, good adhesion prosperity between the interfaces and some other characteristics, being capable of standing the whole stress of the pavement structure and meeting the basic requirements of vehicle loads. Thirdly, the paper applies finite element analysis software ANSYS to respectively establish the flat crush test model, the pavement structure model and the contrast model, carrying out systematical and comprehensive stress analysis for the pavement structure. The calculation results show the following conclusion: a) the vertical deformation value from test model is basically consistent with the deformation value from flat crush test model, and b) the pavement structure is able to meet the demand of the stress and deformation induced by vehicle and temperature loads, and c) the interface adhesion of FRP- epoxy gravel pavement structure is better than that of cement concrete pavement structure.Finally, the paper studies the construction technology of FRP- epoxy gravel pavement structure and applies it in the pilot project, working quite well so far.