Simulation of chloride diffusion tests in cement paste and mortar made with CEM II and CEM VI cements

We developed a simplified coupled model to simulate the chloride ingress of cement paste and mortar fabricated with CEM II/C-M (S-LL) and CEM VI (S-V) cements. Diffusion of chloride, calcium, sodium, potassium, sulphate and hydroxyl ions is considered, resulting in a set of coupled mass balance equa...

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Bibliographic Details
Published inCement and concrete research Vol. 183; p. 107559
Main Authors Bary, Benoît, Machner, Alisa, de Weerdt, Klaartje
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.09.2024
Subjects
CEM II and CEMVI cements
Chloride ingress
Modelling
Multi ionic approach
Simulation
CEM II and CEMVI cements
Multi ionic approach
Modelling
Simulation
Chloride ingress
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Summary:We developed a simplified coupled model to simulate the chloride ingress of cement paste and mortar fabricated with CEM II/C-M (S-LL) and CEM VI (S-V) cements. Diffusion of chloride, calcium, sodium, potassium, sulphate and hydroxyl ions is considered, resulting in a set of coupled mass balance equations. Source and sink terms are introduced to represent the dissolution/precipitation processes due to leaching, and interactions between free chloride and hydrated phases are considered through binding isotherm curves. Electrodiffusion phenomenon is introduced through a modified Poisson equation to enforce local electroneutrality. The model is applied to simulate bulk diffusion tests with exposure solutions containing NaCl, and NaCl + KOH to reduce leaching. The main features observed experimentally are correctly reproduced: a higher chloride content is predicted for the materials made with CEM II binder, and a much clearer peaking behavior near the exposed surface is predicted in the case of NaCl exposure.
ISSN:0008-8846
DOI:10.1016/j.cemconres.2024.107559