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Thermodynamic equilibria-based modelling of reactive chloride transport in blended cementitious materials
Cherif, R.; Hamami, A.E.A.; Ait-Mokhtar, A.; Bosschaerts, W. (2022). Thermodynamic equilibria-based modelling of reactive chloride transport in blended cementitious materials. Cement and Concrete Research 156: 106770. https://dx.doi.org/10.1016/j.cemconres.2022.106770
In: Cement and Concrete Research. PERGAMON-ELSEVIER SCIENCE LTD: Oxford. ISSN 0008-8846; e-ISSN 1873-3948, more
Peer reviewed article  

Available in  Authors 

Author keywords
    Transport modelling; Durability; Chlorides; Dissolution; precipitation rates; Scanning electron microscopy

Authors  Top 
  • Cherif, R.
  • Hamami, A.E.A.
  • Ait-Mokhtar, A.
  • Bosschaerts, W., more

Abstract
    A physico-chemical modelling of multispecies transport through cementitious materials is proposed considering thermodynamic equilibria, diffusion and migration. The model considers seven species profiles (Cl, Na+, K+, Ca2+, SO42−, Al(OH)4 and OH) and the dissolution/precipitation rates during multispecies transport under an electrical field. The fluxes are calculated by the Nernst-Planck equation. Case studies were performed simulating the chloride migration test in the steady state and NT Build 492 test on cement pastes based on slag and/or Portland cement. In order to simulate real exposure to seawater, the migration tests were based on synthetic seawater in the upstream compartment and a synthetic pore solution in the downstream. Pore solution extractions and scanning electron microscopy were performed in order to provide input data and to monitor dissolution/precipitation reactions. The proposed modelling highlights a reduction of up to 10% of free chlorides in the material tested compared to the classic Nernst-Planck modelling.

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