Abstract
One of the ways to increase the service life or upgrade the concrete buildings is by strengthening and repairing techniques. There are many methods of strengthening, such as using slurry infiltration fiber-reinforced concrete (SIFCON). This study cast eight normal reinforced concrete beams of 100 × 150 × 1000 mm. Seven are pre-loaded to 60% of their ultimate load, and the eighth is loaded to its ultimate load. Six beams are repaired with fresh and precast SIFCON layers in different configurations (bottom and jacketing). However, for comparison reasons, two beams are repaired with carbon fiber-reinforced polymer (CFRP) and steel fiber concrete. All beams are tested under a two-point flexural load. The parameters (ultimate load, ductility, toughness, stiffness, crack width, residual strength, and mode of failure) are investigated. The purpose of the study is to use a compatible cement-based material with new techniques for strengthening or repairing concrete members. The results showed that the new techniques significantly improved the behavior of the pre-loaded beams, and SIFCON layers (fresh or precast) could compensate for the failure in the steel reinforcement and be used as external reinforcement.
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