Behaviour of GGBS-dolomite geopolymer concrete short column under axial loading

Geopolymer concrete was developed from Ground Granulated Blast furnace Slag (GGBS) and dolomite which are obtained from steel and rock industries. Optimum proportions of GGBS and dolomite were found out based on the maximum compressive strength. GGBS-Dolomite geopolymer concrete can reduce construction time and cost due to high early age strength. Experimental investigations were conducted to evaluate the behavior of GGBS-dolomite geopolymer concrete short columns under axial loading. GGBS-dolomite geopolymer concrete column showed better stress-strain behavior compared to cement concrete specimens. Load carrying capacity of geopolymer concrete specimens were improved by adding steel fibres at 0.25, 0.5 and 0.75% by volume of concrete. Ductility of geopolymer concrete was enhanced by 18%, 30% and 45% with the addition of steel fibres in the range of 0.25-0.75% by the volume of concrete. Parameters such as ultimate load, deflection, ductility and crack pattern of axially loaded short columns were evaluated using finite element method. It was observed that geopoly mer concrete has 28% reduction in cost/ultimate load compared to ordinary concrete. GGBS-dolomite geopolymer concrete short columns without ductile detailing behaves similar to that of cement with ductile detailing (as per IS 13920-2016) with reduced cost/strength ratio.