JCE_V1_N4_RP4 Radhakrishna Manjunath G.S. Venumadhav T. Journal on Civil Engineering 2249 - 0779 1 4 28 37 Cement Concrete, Geopolymer Composites, Compressive Strength, Water-to-Cement Ratio, Fluid-to-Binder Ratio, Abrams' Law Compressive strength development of Portland cement concrete and geopolymer composites is studied together. In case of Portland cement concrete the bonding that takes place is by chemical reactions resulting due to combination of ionic, covalent and van der Waals forces. On the other hand, in fly ash based geopolymer composites bonding is initiated by thermal energy and chemical reaction. In both the cases, it is a constant volume hardening process. The parameters considered in case of geopolymer composites are binder, fluid content, age, curing condition, molarity of alkaline activator solution. It is observed that in both these materials the compressive strength development follow a definite path with respect to fluid-to-binder ratio by the variation of different parameters. A phenomenological model is developed by generalized Abrams' law to assess the strength. The model is further validated by using independent experimental data. September - November 2011 Copyright © 2011 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1697