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Retrofitting Of Geopolymer Beam Using Carbon Fibre Mat

K.R. Yoganathan, Dr.N.Mahendran

The aim of the paper is to evaluate the flexural strength of Geopolymer concrete beam with Carbon Fibre Reinforced Polymer (CFRP) wrapping (tension side) and to validate with control beam. The material used for the preparation of geopolymer concrete beam are sodium hydroxide, sodium silicate, Class F flyash, fine aggregate, coarse aggregate, superplasticizer and carbon fiber mat. The geopolymer concrete flexural beams were casted and pasted with the carbon fiber in tension side by using 100% replacement of cement to achieve the required strength as equivalent to conventional concrete. The material used for the beam preparation of geopolymer concrete are carbon fiber, sodium hydroxide, sodium silicate, flyash, fine aggregate, coarse aggregate and super plasticizer. The geo polymer concrete flexural strength beams were cast and pasted with the carbon fibre in tension side by using epoxy resin and cured under atmospheric temperatures. After 28 days, the beams were tested for getting flexural strength of beams and results were compared with the conventional concrete beam. The report represents the comprehensive summary of extensive studies conducted on flyash based geopolymer concrete beam. Test data are used to identify the effects of salient factors that influence the properties of geopolymer concrete in the fresh and hardened states. The results show that the enhancement of strength depends on the environmental conditions of the location. This paper reports about curing that was done as atmospheric curing (sun drying), whereas some of the researchers have used oven curing to get enhanced strength. The results are not too competitive but they help to draw the conclusion that the environment plays a major role in rehabilitating structures. The success rate of curing the geopolymer concrete under atmospheric temperature will also lead to major usage for concrete structures.