Drying model of a high salt content cementitious waste form: Effect of capillary forces and salt solution

Peng Zhang, Zhiliang Chen, Kevin G. Brown, Johannes C.L. Meeussen, Chen Gruber, Andrew C. Garrabrants, David S. Kosson

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

A water transport model coupling capillary liquid flow with vapor diffusion is developed to describe the drying process for a cementitious waste form with high salinity porewater. Vapor-liquid equilibrium is formulated as the driving force for vapor diffusion and the model accounts for pore capillary and high salinity effects on water thermodynamic activity. Pore filling and porewater surface tension as a function of pore size distribution and water saturation have been quantified for the material. Geochemical speciation modeling is used to simulate porewater activity as a function of composition over the range of saturation. The theoretical relationship between relative humidity and water saturation generally agrees with experimental measurement, and the developed model is capable of predicting drying rates under various external relative humidity conditions. The model was developed to be incorporated into reactive transport models considering the effects of drying such as salt redistribution and efflorescence.

Original languageEnglish
Article number106459
JournalCement and Concrete Research
Volume146
DOIs
StatePublished - 1 Aug 2021
Externally publishedYes

Keywords

  • Alkali activated cement
  • Drying
  • Modeling
  • Pore solution
  • Transport property

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science (all)

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