• M. SARITHA
• Syed Rizwan

This Near Surface Mounted (NSM) and Externally Bonded Reinforcement (EBR) are now emerging as a promising techniques, for increasing flexural and shear strength of RC members by FRP rods and laminates. Introducing openings in existing reinforced concrete (RC) slabs can severely weaken the slabs due to the cut out of both concrete and reinforcing steel. In this thesis, the use of Glass Fiber Reinforced Polymers (GFRP) strengthening alternatives to restore the flexural capacity of the RC slab after having multiple openings in the slab have been studied. The structural performance of RC Slab with multiple openings strengthened with NSM and EBR by GFRP rods was investigated. NSM technique consists of placing FRP rods in a groove cut into the surface of the member while, EBR technique consists of placing and bonding of FRP sheets on the pre-cut grooves named Externally Bonded Reinforcement On Grooves (EBROG). The FRP bars and sheets may be embedded in an epoxy or cementitious based paste, which transfers stresses between the substrate and the bar. The slab have dimensions of 1050mm x 1050mm x 70mm were provided with two openings of 150mm x 150mm which was loaded at the centre of the slab, whose load carrying capacity and specific failure patterns were investigated. Six slabs were tested in which the two control slabs are casted with and without openings and three slabs with openings strengthened with GFRP rods in two different patterns such as strengthening around the opening and strengthening in diagonal form and remaining slab is strengthened with GFPR sheets in two different directions. The test results shows that the load-carrying capacity of RC slab reduced up to 37% while reducing an area about 5% by providing openings and the RC slab with openings strengthened by placing GFRP rod around the opening improves the load carrying capacity about 39% than strengthening in diagonal pattern which is about 23% respectively. While, the test results of EBR technique, by placing GFRP sheets around the slab openings improves the load carrying capacity about 20%.

RC slab, Openings, Strengthening, GFRP rods, NSM and EBR techniques.

"A COMPARITIVE STUDY ON STRENGTHENING OF R.C SLAB WITH MULTIPLE OPENINGS BY NSM AND EBR TECHNIQUES", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 11, page no.333-341, November-2018, Available :http://www.jetir.org/papers/JETIR1811140.pdf

"A COMPARITIVE STUDY ON STRENGTHENING OF R.C SLAB WITH MULTIPLE OPENINGS BY NSM AND EBR TECHNIQUES", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 11, page no. pp333-341, November-2018, Available at : http://www.jetir.org/papers/JETIR1811140.pdf