Modelization of the joint formation stage in a concrete structure reinforced by carbon fiber plastic plates

One reinforcement technique for concrete structures consists of using a tension-resistant material (carbon fibers in an epoxy matrix), tightly linked to the concrete support by means of an adhesive through which stresses are transmitted. Reported failures in actual applications are usually due to a poor-quality adhesive/concrete joint. Current research is aimed at studying the joint formation phase. We have focused on the adhesive penetration process that precedes polymer curing. A solvent-based type of adhesive has been selected for this study since its higher fluidity should enable producing a higher-quality joint. We have used numerical techniques in order to solve differential equations describing the major physical phenomena involved in the adhesive penetration process. The numerical results obtained allow us to highlight those physical parameters that actually influence adhesive penetration and to roughly estimate the mechanical strengthening of the adhesive joint.