Abstract
The objective of this study is to assess the corrosion rate and potential level of reinforcing steel in geopolymer aggregate concrete. Geopolymer Aggregate Concrete (GPAC) is used as sustainable alternative material instead of natural aggregate. The alumino-silicate source materials, such as ground granulated blast furnace slag are combined with alkali activators such as sodium hydroxide and sodium silicate to create GPAC. In this work, concrete specimens made using GPAC and Ordinary Portland Cement (OPC) with natural aggregate were prepared and subjected to accelerated corrosion exposure. The rate of corrosion in GPAC and OPC concrete was assessed using artificially induced corrosion. The GPAC concrete specimen corrosion rate under accelerated conditions ranged from 1 to 2 mA, indicating a moderate to high rate of corrosion. The OPC concrete specimen corrosion rate between 1 and 2 mA, indicating extremely significant corrosion activity. When compared to OPC specimen, GPAC exhibits greater resistance to chloride-induced corrosion, with lower corrosion rates and mass loss percentages.
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