Strengthening of RC structures with SRP/SRG systems: bond tests - Rinforzo di strutture in c.a. con sistemi SRP/SRG: test di delaminazione

Steel reinforced polymer (SRP) and steel reinforced grout (SRG) systems have recently been introduced in civil engineering for the external strengthening of RC members. Despite the unquestionable advantages deriving from the use of these systems, in terms of both performance and costs, the scientific papers available in literature are still limited, and there are several aspects related to their behaviour that need a better examination. Among them, the SRP/SRG-concrete bond is highlighted and this paper provides a contribute in this sense by presenting some results of 142 bond tests carried out at the University of Salerno. Particularly, tests have allowed for performing the first considerations on the SRP/SRG-concrete bond in terms of failure mode, debonding loads and effective bond lengths by varying the following parameters: concrete strength; bonded length; ratio between width of the adhesive strip and width of the reinforcement; steel tape density, and quality of the surface preparation