Abstract
This study investigates the effect of GGBS on strength and corrosion performance of steel in chloride contaminated fly ash-GGBS based geopolymer concrete (GPC). Fly ash and fly ash-GGBS based GPC mixes were added with 0% and 3.5% of NaCl during the time of preparation. Corrosion potential measurement and corrosion current density by linear polarization resistance (LPR) measurement were performed on reinforced cylindrical GPC specimens. Results indicated that the fly ash-GGBS based GPC showed higher compressive strength as compared to fly ash based GPC, due to formation of N-(C)-A-S-H and C-S-H gel in fly ash-GGBS based GPC which is evident from FESEM analysis. The chloride admixed GPC mixes achieved lower compressive strength than that of control (0% NaCl) GPC mixes. There was a higher probability of corrosion initiation and higher corrosion current density of steel reinforcement in NaCl added GPC as compared to the control GPC.
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