Compressive strength of mixture proportioning in ternary cementitious systems

Abstract

This paper presents a study on the strength of mortars made with ternary blends of ordinary Portland cement (OPC), ground rice husk ash (RHA) and classified fly ash (FFA). The mortar mixtures were made with Portland cement Type I containing 0-40% FFA and RHA. FFA and RHA with 1-3% by weight retained on sieve No. 325 were used. Compressive strength of the blended cement mortar at the age of 7, 28 and 90 days were determined. The results reveal that the use of ternary blended cements of RHA and FFA produces good strength mortars. A statistical analysis and two-parameter polynomial model are presented to predict the compressive strength. For compressive strength, the mathematical model correlates well with the experimental results. The computer graphics of strength of the ternary blended mortars are also constructed and can be used to aid the understanding and the proportioning of the blended system.