WEAR APPRAISAL OF MOVEMENT JOINTS’ STRUCTURES AND WAYS TO IMPROVE THEIR DURABILITY
Movement joints are one of the most important structural elements of bridge structure and represent gaps between end face of span structure and cabinet wall of support or head part of support. The durability of the structure as a whole depends largely on the correct choice and, then, the installation of the movement joints. The results of numerous technical surveys of bridges and overpasses show that the main defects and damages of movement joints structural elements are: weld structure disorder due to incorrect selection and installation; Formation of cracks in the zone of seams on the coating of different length and with different opening width. In addition to the above-mentioned defects, the formation of gauge due to differences in the marks of the bridge web at the joint of the road clothes and the movement joints plays a major role in the process of breaking the coating in the zone of movement joints. Destruction of coating in zones of movement joints in many cases is due to intensive gauge formation, at the same time, formation of wheels is due to difference of marks of road clothes and movement joints. To prevent colour formation in the zone of movement joints the following technical solutions are used: arrangement of pedestrian zones; Application of concrete tides (boundaries). In these zones it is recommended to arrange tides on the basis of polymer composite materials (PCM), having high damping properties and cyclic durability. Endurance tests and the study of damping properties were carried out according to conventional methods for polymer betons FAM and FAZIS-30. The values of the vibration decree for the above-mentioned materials and their cyclic durability are obtained.