STRENGTHENING OF PLAIN CEMENT CONCRETE BEAM USING FIBER REINFORCED POLYMER COMPOSITES

Abstract

A great deal of investigation is now being directed around the globe into the utilisation of fibre reinforced polymer wraps, coverings, and sheets in the upkeep and fortification of built up huge people. Fiber-reinforced polymer (FRP) treatment has shown to be a very effective method of repairing and reinforcing buildings that have become mainly weak over time. In comparison to traditional repair systems and conventional materials, FRP repair systems provide a financially viable alternative. The flexural and shear behaviour of conventional beams strengthened with consistent glass fibre reinforced polymer (GFRP) sheets has been studied. Using a balanced two-point method, remote-built cement footers with epoxy-reinforced GFRP sheets were tested to failure. For this experimental test programme, three sets of samples were cast. In SET I, three cubes with weak flexure were cast, one as a reference sample and the other two as flexure reinforcement utilising continuous glass fibre reinforced polymer (GFRP) sheets. In SET II, three shear-weak cylinders were casted, one of which was controlled and the other two were strengthened in shear using continuous glass fibre reinforced polymer (GFRP) sheets. In SET III, three flexure-weak prisms were cast, one of which was the controlled beam and the other two were strengthened in the flexure using glass fibre reinforced polymer (GFRP) sheets. The samples are strengthened or repaired using different amounts and combinations of GFRP sheets and resins. In addition, twelve cylinders are cast, one set of which is a control cylinder and the other three sets of which are retrofitted with glass fibre reinforced polymer (GFRP) sheets and tensile strength evaluated.

The load, deflection, and failure modes of each of the beams were all measured in the lab. The process and use of GFRP sheets for reinforcing RC beams are also covered in great depth. The impact of the quantity of GFRP layers on the ultimate load bearing capability and failure mechanism of the beams is discussed.

A great deal of investigation is now being directed around the globe into the utilisation of fibre reinforced polymer wraps, coverings, and sheets in the upkeep and fortification of built up huge people. Fiber-reinforced polymer (FRP) treatment has shown to be a very effective method of repairing and reinforcing buildings that have become mainly weak over time. In comparison to traditional repair systems and conventional materials, FRP repair systems provide a financially viable alternative.

The flexural and shear behaviour of conventional beams strengthened with consistent glass fibre reinforced polymer (GFRP) sheets has been studied. Using a balanced two-point method, remote-built cement footers with epoxy-reinforced GFRP sheets were tested to failure. For this experimental test programme, three sets of samples were cast. In SET I, three cubes with weak flexure were cast, one as a reference sample and the other two as flexure reinforcement utilising continuous glass fibre reinforced polymer (GFRP) sheets. In SET II, three shear-weak cylinders were casted, one of which was controlled and the other two were strengthened in shear using continuous glass fibre reinforced polymer (GFRP) sheets. In SET III, three flexure-weak prisms were cast, one of which was the controlled beam and the other two were strengthened in the flexure using glass fibre reinforced polymer (GFRP) sheets. The samples are strengthened or repaired using different amounts and combinations of GFRP sheets and resins. In addition, twelve cylinders are cast, one set of which is a control cylinder and the other three sets of which are retrofitted with glass fibre reinforced polymer (GFRP) sheets and tensile strength evaluated.

The load, deflection, and failure modes of each of the beams were all measured in the lab. The process and use of GFRP sheets for reinforcing RC beams are also covered in great depth. The impact of the quantity of GFRP layers on the ultimate load bearing capability and failure mechanism of the beams is discussed