DEVELOPING CHLORIDE RESISTING CONCRETE USING PFA

PFA concrete mixes were designed to optimise resistance to chloride in gress. Chloride binding capacity, intrinsic permeability and their con comitant influence on the coefficient of chloride diffusion have been investigated. PFA replacements up to 67% and exposure concentrations o f 0.1, 0.5, 1.0 and 5.0 mole/litre were used. Chloride binding capacit y was found to increase with increasing PFA replacement up to 50% and to then decline. It increased with chloride exposure concentration as well as water/binder ratio. The coefficient of chloride diffusion of c oncrete samples was found to be dependent on both the intrinsic permea bility of the concrete and the ability of its cement matrix to bind ch lorides. (C) 1997 Elsevier Science Ltd.