Pengaruh Perkuatan Beton Menggunakan CFRP Pada Peningkatan Kapasitas Lentur Balok Hybrid Baja Ringan Paska Korosi Mutu F'C 40 MPa

Modern construction often faces challenges related to the durability and strength of structures, particularly concerning corrosion, which can reduce the service life of materials. Corrosion in reinforced concrete beams is one of the primary factors affecting structural integrity. To address this issue, innovative approaches are needed to enhance the flexural capacity of beams. The use of lightweight steel as additional reinforcement can improve the load-bearing capacity of reinforced concrete beams. However, lightweight steel is still susceptible to corrosion. Therefore, in this study, the author tested hybrid reinforced concrete beams combining lightweight steel and externally strengthened with Carbon Fibre Reinforced Polymer (CFRP) sheets. The beam dimensions used were 20 cm x 30 cm x 170 cm. The test results showed that the load capacities of the BHK, BHC, and BHC+CFRP beams were 83,38 kN, 76,58 kN, and 120,21 kN, respectively. The maximum load capacity increase for the corroded hybrid lightweight steel beam with CFRP reinforcement was calculated as ((120,21 -76,58))/76,58 = 56,97% Additionally, post-corrosion cracking tended to produce horizontal cracks, while the CFRP-reinforced beam exhibited debonding cracks.