FLEXURAL RESPONSE OF HYBRID FIBRE REINFORCED GEO POLYMER CONCRETE

Concrete is the most common material for construction. Concrete is known as a significant contributor to the emission of greenhouse gases. The c ement industry is the second largest producer of the greenhouse gas. The environmental problems caused by cement production can be reduced by finding an alternate material. One of potential material to substitute for conventional concrete is geo - polymer co ncrete. Geo - polymer concrete is an inorganic alumino - silicate polymer synthesized from predominantly silicon, aluminium and by product materials such as fly ash, GGBS (ground granulated blast furnace slag). Geo - polymer concrete does not contain cement. Hyb rid fibres were used in this study. Hybrid fibre is the combination of steel fibre and basalt fibre with different volume fractions. When these fibres are added to this special concrete it improves the ductile behaviour and energy absorption capacity. The main objective of the study is to look into the shear behaviour of hybrid fibre reinforced geo - polymer concrete beams. Test specimens of 1200×150×100 mm size were used for the study. 20 - 30% of Fly ash by the mass was replaced by GGBS. The variable used wer e percentage of steel fibre volume fraction viz. 0.0%, 0.5%, and 1%, and basalt fibre volume fraction viz. 0.0%, 0.15%,and 0.3. The geo - polymer specimens were cured by using steam curing chamber. The specimens were tested after the age of 7 days. The obtai ned results of Fly ash and GGBS - based hybrid fibre geo - polymer concrete (F&GHGPC) specimens were compared wit h the only Fly ash - based hybrid