RESEARCH OF TACTICAL TENSIONS OF CLUTCH OF GLASS-COMPOSITE AND METAL REINFORCEMENT BARS WITH HEAVY CONCRETE

Abstract

Since the adhesion of reinforcement to concrete is the main factor of their joint operation, and the studies of fiber-glass composite bars with concrete are obviously insufficient despite the growth in their use in road and housing construction, an analysis was conducted to compare the adhesion between metal and fiber-glass reinforcement with heavy-weight concrete by the beam method RILEM/CEB/FIP. The essence of this method is that in the process of testing the displacements of the free ends of the test rod are measured, which are fixed by means of hour-type indicators with a split price of 0.001mm, located at the ends of the beams. The beams were tested by two concentrated forces P1, the distance between which was 400 mm. The test specimens were loaded in steps of 5 kN. In the beams at each stage of the load was measured longitudinal deformation of the rod, earned in concrete, using strain gauges. The adhesion forces create a complex stress-strain condition in the concrete adjacent to reinforcement bars. Such condition results in distribution of stresses along the reinforcement axis, so that the longitudinal forces on the reinforcement become variable along the entire bar length. It has been experimentally proven that as the stress on the concrete beam is increasing in the areas of contact between the reinforcement and concrete, shear stresses are observed to be shifting from the starting points towards the end ones within the anchoring area; and for metal reinforcement, the shear stresses are 9.4% less than for glass composite. It has been determined that the adhesion stress between glass-fiber reinforcement and concrete is 38% higher as compared to steel reinforcement.