Geopolymer concrete mixes were cast using fly ash, kaolin, sodium hydroxide, potassium hydroxide, sodium silicate and aggregates. Portland cement concrete (M30) was used as a reference sample. The effect of silica fume, temperature (40 degrees C, 60 degrees C, 80 degrees C, 100 degrees C and 120 degrees C), sodium and potassium hydroxides and different super plasticizers on the compressive strength are reported Maximum strength was found at 100 degrees C and 14 M alkali solution [1]. (C) 2015 The Authors. Published by Elsevier Inc.