Author(s): K Selvam, K Shanthakumr, P Manikandan and N Karthic

Abstract: Most previous works on fly ash based geopolymer concrete focused on concretes subjected to heat curing. This study has focused on a fly ash-GGBS based geopolymer concrete suitable for ambient curing condition. Class F fly ash was used as a binder material, 40% of GGBS (Ground Granulated Blast-Furnace Slag) was also added. 5% of ordinary Portland cement (OPC) was added with low calcium fly ash to accelerate the curing of geopolymer concrete instead of using elevated heat. GGBS and OPC were improved the setting time of the geopolymer concrete. Geopolymer concrete usually undergone catastrophic failure. To overcome this failure the glass fibre was added to the geopolymer concrete. Various percentage of glass fibre was added to the geopolymer concrete to improve the flexural strength. Based on the literature survey the glass fibre percentage was varied by 0.01 to 0.04 to the volume of geopolymer concrete. The curing of geopolymer concrete was done in ambient temperature. Based on the result it was observed that addition of glass fibre resulted in considerable increase in mechanical properties. 0.03% of glass fibre provided the maximum strength geopolymer concrete compared to the geopolymer concrete without using glass fibre.

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