This paper aims at describing the structural behavior of shear-deficient reinforced concrete beams retrofitted with SIMCFL jackets and provides a simple analytical procedure for predicting the shear capacity of the retrofitted members. An experimental work was carried out to study the behaviour of reinforced concrete beams retrofitted with Slurry Infiltrated Mat Continuous Fibre Laminates (SIMCFL). Totally eleven Reinforced Concrete (RC) beams of size 150 x 250 x 2000 mm were casted. Out of eleven beams, two beams were considered as controlled beam for reference and the remaining nine beams were used for retrofitting purpose. A set of three laminates (SIMCFL) were casted for the combination of material like 100% Cement slurry, 50% Cement + 50% GGBFS and 50% Cement + 50% Fly ash with a w/c ratio of 0.40. The RC beams ,designed for under reinforced section were casted for M20 grade concrete with a w/c ratio of 0.45. Both, RC beam and Slurry Infiltrated Mat Continuous Fibre Laminates were retrofitted with adhesive material at the bottom of the beam, that is, after 28 days water curing. The beams were tested using loading frame of capacity 1000 kN for flexural strength. Based on the obtained enhanced results, it was concluded that the combination 50% Cement + 50% GGBFS and 50% Cement + 50% Flyash Slurry Infiltrated Mat Continuous Fibre Laminated beams can be used to strengthen the RC beams for retrofitting purpose.