Performance Improvement of Reinforced Concrete Beams Strengthened with GFRP Sheet

Concrete has a strong compression strength but low tensile strength. As a result, a steel bar is used in concrete construction to increase tensile strength and prevent cracking from occurring due to loading on top of the structure. However, one significant disadvantage of using steel bars in concrete is that it is prone to corrosion. Among the efforts to restore the function of the RC concrete structure when undergoing spalling is by making repairs with grouting and using GFRP sheets. This study aims to increase the bending capacity of reinforcement concrete (RC) beams that have undergone spalling by repairs using sika grout and strengthening the structure with the GFRP Sheet. The results showed that by using grouting improvements in the spalling beam, supported by the GFRP sheet layer, the bending capacity of the reinforced beam increased by 8.9% compared to the control beam (CB). Tensile strain measured in bonded sheets at peak loads for BGRST1, BGRST2, and BGRST3 is 13210.5 µɛ, 13,797.1 µɛ, and 15466 µɛ, respectively. The results of the RC control beam test showed that everything failed to bend while for variation beams, it experienced debonding failure and the concrete decking was peeled off.