Energy Procedia

Volume 50, 2014, Pages 429-436

Technologies and Materials for Renewable Energy, Environment and Sustainability (TMREES14 – EUMISD)

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Rhizophora Mangle L. Effects on Steel-reinforced Concrete in 0.5 M H2SO4: Implications for Corrosion-degradation of Wind-energy Structures in Industrial Environments ☆

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Joshua Olusegun Okeniyi a, ⁎, joshua.okeniyi@covenantuniversity.edu.ng, Cleophas Akintoye Loto a, b, Abimbola Patricia Idowu Popoola b
aMechanical Engineering Department, Covenant University, Ota 112001, NigeriabChemical, Metallurgical and Materials Engineering Department, Tshwane University of Technology, Pretoria 0001, South Africa

Available online 24 July 2014

doi:10.1016/j.egypro.2014.06.052

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Abstract

This paper studies corrosion inhibition and compressive-strength effect of Rhizophora mangle L. leaf-extract on steel-reinforced concrete in 0.5 M H2SO4, simulating industrial environment of wind-energy installations. Electrochemical monitoring and load- bearing/compressive-strength testing were employed for different concentrations of the leaf-extract admixed in duplicated samples of steel-reinforced concretes, immersed in the test-system. Analyses of the experimental test-results, as per ASTM G16- 95 R04, identified 0.1667% Rhizophora mangle L., per weight of cement, with optimum (very good) inhibition efficiency. Rhizophora mangle L. admixtures combined good inhibition efficiency with compressive-strength improvements in concretes. These bear implications for protecting wind-energy structures against corrosion-degradation in industrial environments.

Keywords

  • corrosion degradation;
  • steel-reinforced concrete;
  • sustainable wind-energy structures;
  • non-toxic and environmentally-frendly inhibitor;
  • industrial environment;
  • inhibition efficiency;
  • compressive strength effects
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