Effects of Ground Granulated Blast-Furnace Slag and Limestone Powder on Threshold Chloride Content of Concrete
Keywords:depassivation time, threshold chloride content, concrete, ground granulated blast-furnace slag, limestone powder
This research aims to study the effect of ground granulated blast-furnace slag (GGBFS) and limestone powder (LP) on threshold chloride content, the depassivation time of steel and compressive strength of concrete containing GGBFS and LP. The GGBFS was used as a partial replacement of binder at the replacement percentage of 30%, 40%, 50% and 70% and LP was used to replace the binder at the replacement percentage of 5%, 10% and 15%. The water to binder ratio of 0.50 and covering depth of 2 cm were used. The results showed that the threshold chloride content and depassivation time of concrete containing GGBFS and LP was higher than that of cement-only concrete. Concrete with GGBFS had lower threshold chloride content and longer depassivation time with increasing binder replacement content by GGBFS. The use of LP at 5% binder replacement in concrete containing GGBFS gave higher compressive strength of concrete, longer depassivation time of steel and higher corrosion resistance index of steel in concrete.
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