IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 __________________________________________________________________________________________ Volume: 02 Issue: 09 | Sep-2013, Available @ http://www.ijret.org 202 BEHAVIOUR OF CONCRETE BEAMS REINFORCED WITH GLASS FIBRE REINFORCED POLYMER FLATS G. Jyothi Kumari 1 , P. Jagannadha Rao 2 , M. V. Seshagiri Rao 3 1 Asst Professor, Dept. of Civil Engg, GITAM University, Hyderabad, India 2 Professor & Head, Dept. of Civil Engg, ACE college of Engg and Technology, Hyderabad, India 3 Professor Dept. of Civil Engg, Jawaharlal Nehru Technology University Hyderabad, India, jyothineelapu@gmail.com Abstract Concrete is very strong in compression but it is extremely weak in tension. To resist the tensile stress, steel reinforcement is provided in concrete. Reinforcement corrosion and structural deterioration in reinforced concrete structures are common, and prompted many researchers to seek alternative materials and rehabilitation techniques. One such material that has been offered as an alternative to mild steel reinforcement is Glass Fibre Reinforced Polymer (GFRP) bars and flats. For the repair and strengthening of structural concrete members, strengthening with Glass Fibre Reinforced Polymer (GFRP) plates is an excellent option. The present work is to study the behavior of Shear resistance of the silica coated GFRP stirrups in the shear test zone. A series of studies were conducted using silica coated GFRP stirrups in shear zone. It is observed that beams with silica coated GFRP flats shear reinforcement have shown failure at higher loads than the theoretical failure loads. Further it is observed that GFRP flats as shear reinforcement exhibit fairly good ductility. Detailed experimental investigations, results and conclusions are given in the page that follows. ---------------------------------------------------------***--------------------------------------------------------- 1. INTRODUCTION A variety of new materials in the field of concrete technology have been developed during the past three decades with the ongoing demand of construction industries to meet the functional, strength, economical and durability requirements. Though concrete has high compressive strength and is the most widely used construction material it suffers from the following three disadvantages. a) Weak in tension. b) Highly porous. c) Susceptible to chemical and environmental attack. The above deficiencies of plain concrete are over-come in the new materials (special cements and concrete composites) developed over the past two or three decades. These special cement concrete composites have unique characteristics, which make them highly susceptible to any given application or environment. FRC is one such material with wide range of applications. Fibre reinforced concrete is relatively a new composite material in which concrete is reinforced with short discrete, discontinuous and uniformly distributed fibres so as to improve many engineering properties such as flexural strength, shear strength, resistance to fatigue, impact, thermal shock or spalling. Fibre is a piece of reinforcing material usually described by its aspect ratio which is defined as the ratio of length of fibre to its equivalent diameter. 2. MATERIALS OF GFRP CONCRETE Cement: Ordinary Portland Cement (OPC) of 53 grade confirming to IS: 8112 can be used. Aggregate: The coarse aggregate chosen for GFRC is typically angular in shape, is well graded, and smaller in maximum size that suited for conventional concrete. Water: Locally available potable water, which is pure and free from harmful impurities such as oil, alkali, acid etc, is used. Gfrp Bars And Flats: Silica coated GFRP bars of diameter 6mm with Fiber Resin ratio 7:3 with tensile strength of 380 Mpa are used. Mild Steel Bars: Mild steel bars of diameter 6mm and yield strength of 250 Mpa were used for casting of control specimens for comparative study. Hysd Bars: HYSD bars of diameter 8 mm were used for casting of specimens. Polyester Resin: Polyester resin was used to prepare GFRP laminates. It consists of 60% resin, 30% hardener and 10% accelerator.