Research And Development Of The Bridge Expansion Joint Device Of Liquid Rubber Based Concrete

The bridge expansion joint is not only one of the important part but also the weak link ofthe bridge structure, it is directly subjected to the vehicle loads and environmental impactsrepeatedly. Its properties have direct impacts on the health of the bridge structures and drivingperformance. Liquid rubber based concrete (LRBC) is a kind of potential bridge expansionjoint material, with certain advantages. This paper mainly focuses on the mechanicalproperties of LRBC and the form of the structure of bridge expansion joint based on the newconcrete. The specific tasks are as follows:(1)An optimal ratio of LRBC was studied and designed to meet the demand ofexpansion joint. By carrying out the quasi-static flexural and compression test of LRBC, anoptimal ratio to meet the mechanical properties of bridge expansion joints was recommended.On the basis of selected optimal proportion of the mixture, concrete was compressed underdifferent temperatures, and the laws of LRBC compression strength affected by temperaturehas been discovered.(2)Tensile tests on interfacial bond specimens between LR and the concrete at differenttemperatures were carried out, through which the interfacial bond stress-strain relations atdifferent temperatures were measured and the laws that interfacial bonding properties affectedby temperature has been discovered.(3) The operational principle of seamlessly bridge expansion joint was analyzed firstly inwhich the elastic-plastic bodies adapt their deformation to the displacements generated by thebridge as well as achieve the purpose of bearing the weight of the wheel; By analyzing therelationship between the width and stroke of expansion joint material, we designed thestructure form of expansion joint. The stress distribution in different structural forms ofexpansion joint were investigated numerically by use FEM program; and the structural formsof expansion joint was optimized. The results of the simulation showed that both themechanical properties of LRBC and the form of the expansion joint meets the engineeringdemands.(4)We studied the construction process of bridge expansion joint and proposed some improvements.