CHLORIDE BINDING CAPACITY, PENETRATION AND PORE STRUCTURES OF BLENDED CEMENT PASTES WITH SLAG AND FLYASH

Abstract

This paper is an attempt to study the relations between chloride binding capacity, penetration and pore structures of blended cement pastes with slag and flyash. Chloride binding capacity was determined by adsorption and desorption experiments in solutions with different chloride concentration. Chloride diffusivity was determined by a rapid method proposed previously by the authors of this paper. Pore structures were determined by mercury intrusion porosimetry (MIP) and water desorption isotherms (WDI). The experimental results show that the flyash cement paste has excellent resistance to chloride penetration, due to its fine pore structures and high chloride chemisorption capacity. The good chloride penetration resistance of slag cement pastes is mainly attributed to their fine pore structures which can be easier to be blocked by chloride binding layers. It is suggested that the most important factors for chloride penetration should be pore structures and chloride chemisorption capacity. (A) For the covering abstract of the conference see IRRD 853281.