Experimental Study on the Flexural Behaviour of Retrofitted RC- Beams using Near Surface Mounted Technique and BFRP Sheets
Structures are in a phase of faster deterioration due to adverse environmental conditions. Most of there in forced
concrete structures reached their life time and time has come to repair/strengthen them. Various retrofitting techniques have
been started in the field of construction and a brief of some of the techniques is mentioned in the study. The awareness
among the people regarding retrofitting techniques is quite low. This study primarily deals with the use of Basalt Fiber Rein
forced Polymer bars and sheets for strengthening the RC beams. In this work the BFRP bars and sheets are used to enhance
the flexural capacity of the RC beams under four-point loading conditions and retrofitted at various pre-loading conditions.
The load deflection characteristics are studied for various pre-loading conditions using BFRP bars, sheets and the
combinations. The BFRP bars and sheets are introduced into the pre-cracked beam by the use of epoxyadhesive. The study
considered the comparison of retrofitted beam of 50% & 70% preloading conditions with the control beam. The
enhancement of ultimate load carrying capacity was above 25% in all the cases also the use of bi-directional BFRP sheets
increased the capacity by more than40% and the combinations increased the capacity by more than 50%. Slipping/debonding
is not observed in the bars but the sheets showed de-bonding with the concrete under ultimate loading conditions.
Keywords - Pre-Cracked RC Beam, BFRP, Near-Surface-Mounted (NSM) ,U-Wrapping, Combination NSM and UWrapping.