Abstract
This article investigates the potential detrimental effects of cyclic load during the installation of externally bonded (EB) carbon fiber-reinforced polymer (CFRP) on a damaged reinforced concrete (RC) structure. Four RC specimens were tested in three point bending to study the consequences of crack cyclic opening-closure during epoxy-curing period. A first RC specimen (without bonded CFRP) was loaded monotonically up to failure to serve as undamaged control sample. The three other specimens were pre-cracked before being subjected to a fatigue loading procedure to simulate service condition of a damaged RC structure. Two of the three pre-cracked specimens were strengthened by EB CFRP. One specimen was repaired before the fatigue test while the other one was repaired during the fatigue test. Finally, remaining capacities of all three pre-cracked specimens were measured through monotonic bending tests until failure. It was found that, although bonding of CFRP reinforcement during cyclic load can induce some interesting features with regard to serviceability, cyclic crack opening and closing alters the cure process of epoxy located below the initial crack and decreases the effectiveness of the strengthening at ultimate state. Extended experimental studies are then needed to assess reliable safety factor for the design of repairing operations in which the bridge has to be maintained in service during CFRP installation.
Highlights
Accepted: 7 January 2022The rehabilitation of reinforced concrete (RC) structures by externally bonded (EB)carbon fiber-reinforced polymer (CFRP) systems is readily used among other techniques in order to shorten intervention times, reduce the inconvenience for users and diminish the costs for operators [1,2]
The experimental study reported in the present paper was carried-out to study potential detrimental effects of the service load on the effectiveness of a CFRP strength
The experimental study reported in the present paper was carried-out to study the ing system bonded on a RC bridge remained open to traffic during rehabilitation
Summary
The rehabilitation of reinforced concrete (RC) structures by externally bonded (EB). carbon fiber-reinforced polymer (CFRP) systems is readily used among other techniques in order to shorten intervention times, reduce the inconvenience for users and diminish the costs for operators [1,2]. In most of bridge repair projects, specialized companies recommend stopping traffic to intervene If this interruption is possible, conventional strengthening techniques by epoxy-bonded CFRP involve few days curing at ambient temperature. CFRP strengthening systems are generally installed with the purpose of rehabilitation of damaged RC structures, most of the studies of the influence of trafficinduced vibration during bonding are conducted on undamaged concrete specimens. These studies only focus on the bonding of unidirectional CFRP pultruded plates (traditionally used for enhancing flexural capacity) while bidirectional carbon sheets are often used in rehabilitation project (for shear strengthening or confinement). This study investigates the performance of a pre-cracked RC specimen strengthened with a bidirectional CFRP system installed during curing of the adhesive
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