Chloride and Oxygen Permeability of Concrete Incorporating Fly Ash and Silica Fume in Ternary Systems

Results presented herein form part of an investigation into the optimization of ternary blend systems based on normal portland cement, fly ash, and silica fume, for the development of high performance concrete. Chloride and oxygen permeability values at ages of 7, 28, 90, and 180 days of concrete containing portland cement, fly ash, and silica fume are reported. Fly ash, up to 40%, and silica fume, up to 15%, were incorporated as partial cement replacements for the preparation of various combinations of ternary blended systems. A water-binder ratio of 0.27 was used for the main group of mixtures. Two other water-binder ratios, 0.40 and 0.50, were used with selected concrete mixtures to show the effect of this parameter. Based on experimentally obtained results, prediction models were developed enabling the establishment of isoresponse contours showing the interaction between the various parameters studied.