JCE_V1_N2_RP7 B. Siva Konda Reddy J. Varaprasad K. Naveen Kumar Reddy Journal on Civil Engineering 2249 - 0779 1 2 63 68 Geopolymer, Alkali activator, Workability, Compressive Strength This paper presents the effect of Alkali activator / Fly ash ratio (A/F) on strength and workability of geopolymer concrete prepared from low lime based fly ash and a mixed alkali activator of sodium hydroxide and sodium silicate solution. The workability of concrete is found to be increasing when the A/F ratio is increased. An increase in compressive strength of the concrete samples is observed when the A/F ratio is increased for the samples cured at 60 degree C. March - May 2011 Copyright © 2011 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1448