Sustainable Anti-Corrosion Concrete Using Steelmaking Slag, Pistachio Shell, and Polyaniline: An Environmental Approach

This research comprehensively investigates the potential for reusing industrial and agricultural wastes, namely steelmaking slag and pistachio shell, in the production of sustainable concrete with superior anti-corrosion properties. Considering the annual disposal of significant amounts of steelmaking slag as environmental pollutants and the challenge of managing agricultural wastes like pistachio shells, this study presents a novel and environmentally friendly approach aimed at transforming these waste materials into valuable construction materials. In this study, a composite material comprising steelmaking slag and hard pistachio shell, along with polyaniline, was utilized as a partial replacement for Portland cement in concrete formulations. The anti-corrosion properties of the modified concrete were rigorously evaluated using advanced polarization techniques (including Tafel polarization and electrochemical impedance) and by measuring its electrical resistivity. Furthermore, the compressive strength of the concrete specimens was measured to assess their mechanical integrity. The findings of this research indicate that replacing ۱۰% of Portland cement with the composite of steelmaking slag, pistachio shell, and polyaniline leads to a significant improvement in concrete performance. Specifically, after ۹۰ days, the compressive strength of the concrete increased by ۴۲%, its electrical resistivity improved by ۴۹% and polarisation resistance by ۱۵۰%. and the corrosion current density decreased by ۳۷%. These promising results confirm the high potential of this innovative composite in developing anti-corrosive and sustainable concretes through the efficient utilization of industrial and agricultural wastes, paving the way for practical applications in the construction industry.

کلیدواژه ها:

concrete ، steel slag ، char ، PANI ، polarization ، electrochemical impedance ، electrical resistivity ، سرباره فولاد سازی ، ذغال ، پلی آنیلین ، پلاریزاسیون ، امپدانس الکتروشیمیایی ، مقاومت الکتریکی