Ceramics-Silikáty 69, (3) 321 - 333 (2025)

The study mainly focuses on the development of a geopolymer concrete (GPC) to promote sustainable construction practices using agro-industrial by-products, specifically rice husk ash (RHA) and ground granulated blast furnace slag (GGBS). The primary aim of this research is to assess the resistance of GPC containing RHA and GGBS for corrosion, with specific attention to chloride-ingress corrosion, a significant durability concern for reinforced concrete structures in marine and industrial environments. The mix proportions used were 60% RHA and 40% GGBS. A blend of 12 M alkali activators was employed with sodium hydroxide solids and a sodium silicate solution. Tests, including the Rapid Chloride Ion Penetration Test (RCPT), Electrochemical methods, such as Linear Polarization Resistance test (LPR), and Open Circuit Potential test (OCP) were conducted to assess the chloride penetration and corrosion activity. The results indicate that corrosion risk decreases as the curing age increases, particularly in heat-cured specimens. The dense microstructure produced by GGBS enhances the resistance to chloride penetration, thus lowering the corrosion rates. GPC incorporating RHA and GGBS (RGGPC) shows superior corrosion resistance characteristics, making it a promising sustainable alternative.