TY - JOUR
T1 - Thermodynamic equilibria-based modelling of reactive chloride transport in blended cementitious materials
AU - Cherif, Rachid
AU - Hamami, Ameur El Amine
AU - Aït-Mokhtar, Abdelkarim
AU - Bosschaerts, Walter
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/6
Y1 - 2022/6
N2 - 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.
AB - 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.
KW - Chlorides
KW - Dissolution/precipitation rates
KW - Durability
KW - Scanning electron microscopy
KW - Transport modelling
UR - http://www.scopus.com/inward/record.url?scp=85126042260&partnerID=8YFLogxK
U2 - 10.1016/j.cemconres.2022.106770
DO - 10.1016/j.cemconres.2022.106770
M3 - Article
AN - SCOPUS:85126042260
SN - 0008-8846
VL - 156
JO - Cement and Concrete Research
JF - Cement and Concrete Research
M1 - 106770
ER -