Study of ACI and DOE Mix Design Methods for High Strength Concrete using Crushed and Uncrushed Aggregate

The use of high strength concrete (HSC) has increased all over the world. Among the factors that justify this increased use is the strength increase for structural aspects and durability. High strength concrete is a concrete made with conventional concrete materials and admixtures such as fly ash, silica fume, blast furnace slag and superplasticiser, in varying proportions so as to give maximum strength and excellent performance in the various properties of concrete. This paper presents the result of mix design developed for HSC with fly ash and High range water reducing admixture (HRWR) with angular and rounded coarse aggregate. The study aims at comparing two methods of concrete mix design with angular and rounded coarse aggregate; The Department of Environment Method, UK and The American Concrete Institute Method, using different water to cementitious ratio (w/cm). In this research work 53 grades Ordinary Portland cement, the locally available river sand, 12.5mm angular and rounded coarse aggregate were selected based on IS 383:1970 standards for determining the relative quantities and proportions for different w/cm ratio. For design ACI 211.4R-08 and DOE guidelines are followed. The compressive strength values were determined at the age of 28 days curing period respectively. It was found that ACI 211.4R-08 method gives high strength as compared to DOE method. The ACI 211.4R-08 method did not make provision for uncrushed aggregate in its design method, implying that comparison could not be made in that regard.