Thermodynamic equilibria-based modelling of reactive chloride transport in blended cementitious materials
Source abstract
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 +, Ca 2+, SO 4 2−, 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.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Concrete and Cement Materials Research · Concrete Corrosion and Durability · Smart Materials for Construction
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (74)
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