Chloride and Oxygen Permeability of Concrete Incorporating Fly Ash and Silica Fume in Ternary Systems
C. J. Lynsdale and M. I. Khan
Appears on pages(s):
fly ash; high-performance concretes; oxygen; permeability; silica fume
The results presented in this paper form part of an investigation into the optimisation of ternary blend systems based on normal portland cement, fly ash and silica fume, for the development of high performance concrete. Chloride permeability and oxygen permeability values at the age 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 .27 was used for the main group of mixtures. Two other water-binder ratios, .40and .50 were used with selected concrete mixtures to show the effect of this parameter. Based on the experimentally obtained results, prediction models were developed. These enabled the establishment of isoresponse contours showing the interaction between the various parameters investigated.