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Numerical and Experimental Analysis of Self-Protection in Reinforced Concrete due to Application of Mg–Al–NO2 Layered Double Hydroxides
Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research, Germany.
Universidade de Aveiro, Portugal.
Universidade de Aveiro, Portugal.
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.ORCID iD: 0000-0003-1904-7426
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2020 (English)In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648Article in journal (Refereed) Published
Abstract [en]

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. © 2020 The Authors.

Place, publisher, year, edition, pages
Wiley-VCH Verlag , 2020.
Keywords [en]
concrete, corrosion, finite element analysis, layered double hydroxides, Aluminum corrosion, Chlorine compounds, Concrete buildings, Concrete construction, Electrochemical corrosion, Nitrogen oxides, Chloride binding capacity, Chloride binding isotherms, Chloride diffusion, Chloride diffusion coefficient, Increasing the service lives, Numerical and experimental analysis, Reinforcement corrosion, Reinforced concrete
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Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-45394DOI: 10.1002/adem.202000398Scopus ID: 2-s2.0-85087175815OAI: oai:DiVA.org:ri-45394DiVA, id: diva2:1455030
Note

Funding details: 685445; Funding text 1: This research was funded by the European Union's Horizon 2020 research and innovation program under grant agreement number 685445 (LORCENIS — Long Lasting Reinforced Concrete for Energy infrastructure under Severe Operating Conditions).

Available from: 2020-07-21 Created: 2020-07-21 Last updated: 2020-12-01Bibliographically approved

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Mueller, Urs

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