Influence of temperature on the chloride binding of slag-blended cements in the presence of external sulphate

This study looked at the influence of temperature on chloride binding in ground granulated blast-furnace slag (GGBS)-blended cements, in the presence of external sulphate. The study was carried out at 20°C and 38°C, to reflect typical temperate and warm tropical climatic conditions. Two slags, of different compositions were blended with CEM I 52.5R at 30% replacement. 56 day old pastes (w/b 0.5) were exposed to combined solutions of sodium chloride and sulphate, and the resultant chloride binding was compared against CEM I 42.5R. The presence of sulphates reduced chloride binding, slag blends bound more chlorides, while temperature slightly increased chloride binding.