|Concrete is the second most material uses in the world next to water. It is universally accepted out of its durability, strength and it is economical. Apart from the advantage, there are some durability issues to the concrete which may relay on the improper mix design, placement of un anticipated loads, exposure environment and pruning to disasters. In the present scenario the need of repair and retrofitting of existing structures is increasing day-by-day, to meet the design specifications as per the codal provisions. So, the process of retrofitting the columns is of prime important in the whole integrity. Retrofitting using FRP sheets yields good results as per the past studies
In the present a study, the load carrying capacity of the hybrid Carbon(C)-Glass(G)-Basalt(B) externally bound FRP wrapped reinforced concrete columns of M30 grade are studied. In this study, 30 RC column specimens are tested with various combination of FRP like C-C-C, G-G-G, B-B-B, C-G-C,C-B-C, G-C-G,G-B-G,B-C-C, B-G-B are compared with the control columns without any FRP. It was observed that, the highest load carrying capacity is obtained for column C-B-C (column wrapped with 2 parts of CFRP and 1 part of BFRP) i.e., 12.67% and the lowest load carrying capacity is obtained for G-G-G (columns wrapped with 3 parts of Glass) i.e., 2.44%.