Abstract:
This research aims to study the rapid chloride penetration and compressive strength of concrete containing ground granulated blast-furnace slag, fly ash and limestone powder. There were two types of binder in concrete which were binary binder concrete and ternary binder concrete. Binary binder concrete were concrete with ground granulated blast-furnace slag replacement at 30%, 40%, 50%, and 70% of binder and concrete with fly ash replacement at 30% and 50% of binder. For ternary binder concrete, there were concrete with ground granulated blast-furnace slag replacement at 30% and 50% of binder and limestone powder replacement at 5%, 10% and 15% of binder and concreter with fly ash replacement at 30% and 50% of binder and limestone powder replacement at 5% and 10% of binder. The water to binder ratio of 0.40 and 0.50 was used. The rapid chloride penetration tests (RCPT) were performed at 28 and 56 days. The compressive strength tests were done at 28 days From the experimental results of binary binder concrete, it was found that concrete with ground granulated blast-furnace slag replacement at 70% of binder had the lowest rapid chloride penetration for binary binder concrete at water to binder ratio of 0.40. But, at were to binder ratio of 0.50, concrete with fly ash replacement at 50% of binder had the lowest rapid chloride penetration. When the same replacement of ground granulated blast-furance slag and fly ash in concrete was compared, it showed that concrete with fly ash replacement had lower rapid chloride penetartion than concrete with ground granulated blast-furnace slag replacement. For ternary binder concrete, it was found that concrete with ground granulated blast-furnace slag replacement at 50% of binder and limestone power replacement at 5%-15% of binder had the lowest rapid chloride penetration for both water to binder ratio of 0.40 and 0.50. Finally, when the relationship between the rapid chloride penetration and compressive strength of concrete was considered, both binary binder concrete and ternary binder concrete had higher compressive strength and lower chloride penetration than plain cement concrete. Concrete with ground granulated blast-furnce slag replacement at 50% of binder had high comperssive strength and less rapid chloride penetration. Concrete with ground granulated blast-furnace slag replacement at 50% of binder and limestone powed replacement at 5% and 15% of binder had less rapid chloride penetration, but low compressive strength.