Steel corrosion in reinforced alkali-activated materials

  • Shishir Mundra University of Sheffield
  • Susan A. Bernal University of Sheffield
  • Maria Criado University of Sheffield
  • Petr Hlaváček Bundesanstalt für Materialforschung und -prüfung (BAM)
  • Gino Ebell Bundesanstalt für Materialforschung und -prüfung (BAM)
  • Steffi Reinemann Bundesanstalt für Materialforschung und -prüfung (BAM)
  • Gregor J.G. Gluth Bundesanstalt für Materialforschung und -prüfung (BAM)
  • John Provis The University of Sheffield

Abstract

The development of alkali-activated materials (AAMs) as an alternative to Portland cement (PC) has seen significant progress in the past decades. However, there still remains significant uncertainty regarding their long term performance when used in steel-reinforced structures. The durability of AAMs in such applications depends strongly on the corrosion behaviour of the embedded steel reinforcement, and the experimental data in the literature are limited and in some cases inconsistent. This letter elucidates the role of the chemistry of AAMs on the mechanisms governing passivation and chloride-induced corrosion of the steel reinforcement, to bring a better understanding of the durability of AAM structures exposed to chloride. The corrosion of the steel reinforcement in AAMs differs significantly from observations in PC; the onset of pitting (or the chloride ‘threshold’ value) depends strongly on the alkalinity, and the redox environment, of these binders. Classifications or standards used to assess the severity of steel corrosion in PC appear not to be directly applicable to AAMs due to important differences in pore solution chemistry and phase assemblage.

Author Biography

John Provis, The University of Sheffield

Professor, Department of Materials Science and Engineering

Head of the Engineering Graduate School

Published
2017-12-18
How to Cite
MUNDRA, Shishir et al. Steel corrosion in reinforced alkali-activated materials. RILEM Technical Letters, [S.l.], v. 2, p. 33-39, dec. 2017. ISSN 2518-0231. Available at: <https://letters.rilem.net/index.php/rilem/article/view/39>. Date accessed: 16 nov. 2018. doi: https://doi.org/10.21809/rilemtechlett.2017.39.
Section
Articles