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Dynamics of the internal reaction layer arising during carbonation of concrete
University of Bremen.
University of Bremen.
University of Bremen. (Mathematics)ORCID iD: 0000-0002-1160-0007
University of Bremen.
2007 (English)In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 62, no 4, p. 1125-1137Article in journal (Refereed) Published
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Abstract [en]

Carbonation is the reaction of environmental carbon dioxide with alkaline species in concrete. It is one of the major degradation mechanisms affecting the durability of reinforced concrete structures. In this paper, a mathematical model of the carbonation process is formulated and simulated using the finite-element method. Nonlinear reaction rates, Robin boundary conditions and a decrease of the concrete porosity in time are taken into account. A dimensional analysis based on a nondimensionalisation of the entire model is introduced to identify the key parameters and the different characteristic time and length scales of the whole process. Numerical simulations show the occurrence of an internal reaction layer travelling through the material. The speed and the width of the layer are rigorously defined via dimensionless quantities. A parameter study shows that the speed and the width are strongly related to the size of the Thiele modulus which is typically large. The relevance of other parameters is also investigated. The model is validated for accelerated and natural carbonation settings.

Place, publisher, year, edition, pages
Elsevier, 2007. Vol. 62, no 4, p. 1125-1137
Keyword [en]
reaction layer, concrete carbonation, diffusion, Thiele modulus, mathematical modelling, simulation
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kau:diva-39822DOI: 10.1016/j.ces.2006.11.014Scopus ID: 2-s2.0-33846015525OAI: oai:DiVA.org:kau-39822DiVA, id: diva2:901109
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cited By 27

Available from: 2016-02-06 Created: 2016-02-06 Last updated: 2017-05-29Bibliographically approved

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Muntean, Adrian

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