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Numerical and Experimental Analysis of Self‐Protection in Reinforced Concrete due to Application of Mg–Al–NO2 Layered Double Hydroxides

Abstract

Concrete possesses an intrinsic chloride binding capacity. Chloride ions from the environment bind with the hydrated cementitious phases in the form of bound chlorides. The contribution of chemically bound chlorides toward increasing the service life of concrete structures is vital as they help in slowing down the chloride diffusion in the concrete thereby delaying reinforcement depassivation. The authors attempt to increase the chloride binding capacity of concrete by adding a small amount of Mg–Al–NO2 layered double hydroxides (LDHs) with the objective to delay reinforcement corrosion and by this to considerably extend the service life of concrete structures situated in harsh environments. This study presents numerical and experimental analysis of the action of LDH in concrete. Formation factor is used to determine the effective chloride diffusion coefficient. In addition, the chloride binding isotherms together with Poisson–Nernst–Planck equations are used to model the chloride ingress. A comparable chloride binding is observed for concrete with and without Mg–Al–NO2, depicting only a slight chloride uptake by Mg–Al–NO2. Further investigations are conducted to understand this behavior by studying the stability and chloride entrapping capacity Mg–Al–NO2 in concrete.
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Category

Academic article

Language

English

Author(s)

  • Zahid Mohammad Mir
  • Alexandre Bastos
  • Celestino Gomes
  • Urs Mueller
  • Maria Cruz Alonso
  • Kristina Villar
  • Miguel P. Rabade
  • Frederico Maia
  • Cláudia M. Rocha
  • Philippe Mainçon
  • Daniel Höche
  • Mario G. S. Ferreira
  • Mikhail L. Zheludkevich

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • Sweden
  • Portugal
  • Spain
  • University of Kiel
  • Helmholtz-Zentrum Geesthacht

Year

2020

Published in

Advanced Engineering Materials

ISSN

1438-1656

Volume

22

Issue

11

Page(s)

1 - 13

View this publication at Norwegian Research Information Repository