Adhesion of a500c metal reinforcement With concrete for repeated loads

Abstract

The most important factor that ensures the joint work of reinforcement and concrete in reinforced concrete structures is the adhesion at the contact between them. It is achieved by gluing reinforcement with cement stone, friction between the surfaces of these materials, as well as engaging the protrusions on the surface of the rods. In road and civil construction in the manufacture of reinforced concrete structures is most used reinforcing steel sickle profile. Until the 1990s, traditional profile reinforcement was used, which differs significantly from the newer crescent-shaped reinforcement. An important feature of the interaction of reinforcement with concrete is the mutual displacement, as a result of which there may be a redistribution of forces. These areas are called reinforcement anchoring zones. Destructive processes develop within a layer of very small thickness (several millimeters). The redistribution of forces between concrete and reinforcement depends most on the deformation of the contact layer, rather than the size of the shell [2]. Virtually all reinforced concrete structures, especially road structures, are subjected to significant re-loading during operation, the impact of which on the joint work of concrete and reinforcement has been very little studied. This article investigates the features of the coupling of reinforcing bars of class A500C depending on the length of the anchoring under the action of repeated loads. It is established that the size of the concrete shell does not significantly affect the value of the ultimate destructive force of elongation of the reinforcing rod at a single load and significantly more affects the amount of displacement of the reinforcement. Repeated loads affect both the ultimate forces and the complete mutual displacements of the rods relative to the concrete shell.