EFFECT OF ACCELERATORS ON THE COMPRESSIVE STRENGTH DEVELOPMENT OF GEOPOLYMER CONCRETE COMPOSITES

Venkateswararao J, Rambabu K, Srinivasa Rao K, Satish N

Abstract: This study has examined the effect of three accelerators namely calcium chloride, sodium thiocyanate and potassium thiocyanate on the compressive strength development of geopolymer concrete composites. Geopolymer concrete composites were prepared by the geopolymerization of alkaline liquid with binder materials of 80% fly ash and 20% ground granulated blast furnace slag. Combination of sodium silicate and sodium hydroxide solutions was used as alkaline liquid in this investigation. A supplementary material zeolite also used to enhance the geopolymerization. The samples were cured at room temperature. Compressive strengths of geopolymer concrete composites at curing periods of 3, 7 and 28 days were determined. It was found that the addition of accelerators to geopolymer concrete composites results in significant improvement in the compressive strength at 3 and 7 days curing period while the compressive strength at 28 days was not affected.

Keywords: Geopolymer concrete composites, compressive strength, calcium chloride, sodium thiocyanate, potassium thiocyanate, GGBS, zeolite.

DOI: https://doi.org/10.15623/ijret.2016.0526014