Research On The Steel Bridge Deck Pavement Of Epoxy Asphalt Wearing Course

Epoxy asphalt mixture EA10 has become the ideal pavement material of steel bridge deck which has complicated mechanical characteristics for its excellent physical and mechanical properties. However, bulging, cracking and other pavement damage phenomenon still exists as well as early poor anti-sliding performance. This article aims to correct surface defect and improve security features including anti-sliding and drainage through re-designing epoxy asphalt macadam wearing course.First of all, through the summary of relevant literature and specification, the design requirements of steel deck epoxy asphalt macadam carpets are determined from the aspects of structure durability and surface characteristics. The dynamic stability, ultimate strain, splitting tensile strength, shear strength, scattering loss rate and structural depth are used as wearing course performance evaluation indexes.Secondly, the finite element model of the steel bridge deck pavement layer structure are established by finite element analysis software ABAQUS. By varying below layer of the steel bridge deck pavement structure and wearing course thickness, the structure response indexes such as maximum tensile stress, shear stress and deflection deformation are compared with different thickness combination. The research results show that when the thickness combination is 15mmEA5+35mmEA10, the maximum tensile stress, shear stress and deflection of wearing course surface are smaller and the structure has excellent performance.Then, the gradation design of small size EA5 epoxy asphalt mixture is conducted through the volume V-S design method based on coarse aggregate multi-point support frame state. The durable performance and surface performance of EA5 are surveyed, and then compared with EA10 and SMA10. The results show that the wearing course of epoxy asphalt mixture EA5 has excellent high temperature stability, water stability, compression, shear-resisting, wear-resisting and anti-sliding performance whose structural depth improves more than three times compared with EA10, but the deformation ability under the condition of low temperature compared with EA10 declines by 35%, as well as brittleness under the condition of low temperature is decreased.Finally, indoor molding pavement composite structure is built. The properties such as high temperature, low temperature and fatigue performance of composite structure and the simulation of pavement pit slot diseases are surveyed. The repair effect of EA5 is evaluated by using the indexes of dynamic stability ratio and strength repair rate. The results show that the composite has excellent high temperature and fatigue performance, while the low temperature performance of composite structure is poorer. EA5 shows excellent performance in the repair process, so it can be used to repair the existing pit slot diseases in steel bridge deck pavement.