Morinda Lucida Effects on Steel-reinforced Concrete in 3.5% NaCl: Implications for Corrosion-protection of Wind-energy Structures in Saline/Marine Environments

Abstract

This paper studies effects of the leaf-extract of Morinda lucida on the corrosion-degradation of steel-reinforced concrete in 3.5% NaCl, simulating saline/marine environment (prevalent in offshore environments for wind-energy structures/installations). Electrochemical monitoring techniques and compressive-strength testing were employed for different concentrations of the leaf- extract admixture in duplicates of steel-reinforced concrete specimens, partially immersed in the corrosive-medium. Analyses of the experimental test-results according to specification ASTM G16-95 R04 showed that Morinda lucida leaf-extract combined highly-efficient corrosion inhibition, 84.82±7.76% ≤ η ≤ 95.64±1.50%, with good compressive-strength improvements in their admixed steel-reinforced concretes. These bear implications for corrosion-protection of wind-energy structures in saline/marine environments.