CHLORIDE PENETRATION OF HIGH PERFORMANCE CONCRETE

摘要

Precast, prestressed concretes normally have low permeabilities. The effects of chemical admixtures, including calcium nitrite and mineral admixtures such as ground granulated blast furnace slag (GGBFS), on chloride penetration of concrete cured at elevated temperatures has not been fully investigated. This study, using an improved sampling technique, found that curing at elevated temperatures slightly increased chloride penetration. Concrete with 40% GGBFS replacement had improved chloride penetration under both curing conditions compared to concrete without GGBFS, although the chloride content was significantly higher at the surface when GGBFS concrete was cured at elevated temperatures. Calcium nitrite in the presence of GGBFS increased chloride penetration only slightly in concretes cured at elevated temperatures with no significant effect in moist cured concretes.