Caractérisation du comportement d’adhérence des éléments en BA renforcés par matériaux composites selon la technique FRP-NSM

Abstract

The work of this thesis focuses on the reinforcement of concrete elements using the Near Surface Mounted (NSM) technique. This latter is considered as an emerging renovation technique that consists on the insertion of reinforcement in the grooves. The objective of the experimental program developed in this work is to study the possibility of using reinforcements (carbon rods and plates or prestressed steel wires) to increase the structural capacity of reinforced concrete beams manufactured from concrete with low mechanical characteristics. To achieve these objectives, we had first studied the mechanical and physical properties of the reinforcements and their interaction with concrete. Flexural or direct bond tests were carried out to characterize the bond behaviour of these reinforcements with concrete by varying several parameters. The tearing forces in the reinforcements and the sliding at the loaded ends were also measured. Moreover, the influences of concrete strength, the type of reinforcement and the addition of mineral fillers in the resin on the bond behaviour between these three materials (concrete, resin, reinforcement) were analyzed. The overall behaviour of NSM-reinforced beams subjected to four-point bending was studied. Experimental results show that the reinforcement of the beams using the NSM technique is very satisfactory.