Corrosion of Steel Reinforcements in Fly Ash- and Kaolin-based Geopolymer Concrete Immersed in Distilled Water and ASTM Seawater
Abstract: Corrosion behavior
of steel bar in fly ash- and kaolin-based geopolymer concrete immersed in
aggressive media of distilled water and ASTM seawater was compared to Portland
cement concrete having similar mix design. An accelerated corrosion by applying
3 V potential on the steel bar was performed to obtain reasonable test results
in a relatively short time. The potential and pH of the immersing media were
measured from day 1 to day 10 and then plotted on Pourbaix diagram to predict
passivation or corrosion state. At day 10, steel bar in Portland cement
concrete were in corroded state both in distilled water and seawater. The best
corrosion performance was for kaolin- based geopolymer concrete in which at day-10
the steel bar was passivated in both media. Steel bar in fly ash- based
geopolymer concrete was passivated in distilled water but corroded in seawater.
Author: Astutiningsih, S.,
Rustandi, A., Noermalasari, D
Journal Code: jptsipilgg130016
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