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Transport in Porous Media

, Volume 103, Issue 1, pp 69–98 | Cite as

Water Vapor Sorption in Cementitious Materials—Measurement, Modeling and Interpretation

  • Aditya Kumar
  • Sabrina Ketel
  • Kirk Vance
  • Tandre Oey
  • Narayanan Neithalath
  • Gaurav SantEmail author
Article

Abstract

The rate and extent of uptake and release of moisture are critical in controlling the behavior of cementitious materials ranging from fluid transport to hygral deformations. While classically determined using an equilibrium (static) salt solution method (Baroghel-Bouny in Cem Concr Res 37:414–437, 2007), advanced capabilities offered by gravimetric dynamic vapor sorption (DVS) analyzers, are now permitting acquisition of sorption spectra at microgram (\(\upmu \hbox {g}\)) resolution on the order of a few weeks. This work highlights new multicycle determinations of adsorption/desorption isotherms, acquired using a custom-built DVS analyzer for well-hydrated alite and ordinary portland cement pastes over a range of water-to-solid ratios (\(w/s\), mass basis). Special focus is paid to describe measurement aspects relevant to acquiring reliable spectra, and their interpretation. Sorption isotherms are used to assess transport properties, and sorption hysteresis and its irreversibility following first drying. Based on an optimization-based criterion, the Young-Nelson model is selected to simulate sorption evolutions, including the effects of hysteresis. Sensitivity analyses carried out using this model are used to understand the role of parameters, including porosity and \(w/s\), on the hysteresis that develops from the first to subsequent sorption cycles.

Keywords

Sorption Desorption Water vapor Surface area BET Hysteresis 

Notes

Acknowledgments

The authors acknowledge full financial support for this research provided by the University of California, Los Angeles (UCLA). The authors would like to acknowledge Gwenn Le Saout (École des Mines d’Alès) for quantitative x-ray diffraction analyses (QXRD) of the alite and cement. The contents of this paper reflect the views of the authors who are responsible for the accuracy of datasets presented herein. This research was conducted in the Laboratory for the Chemistry of Construction Materials (\(\hbox {LC}^{2})\) in the Department of Civil and Environmental Engineering and the Molecular Instrumentation Center (MIC) in the Department of Chemistry and Biochemistry at the University of California, Los Angeles (UCLA) and Laboratory for the Science of Sustainable Infrastructural Materials (LS-SIM) at Arizona State University (ASU). The authors acknowledge the support of these laboratories in making this research possible.

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Aditya Kumar
    • 1
  • Sabrina Ketel
    • 1
  • Kirk Vance
    • 2
  • Tandre Oey
    • 1
  • Narayanan Neithalath
    • 2
  • Gaurav Sant
    • 1
    • 3
    Email author
  1. 1.Laboratory for the Chemistry of Construction Materials (LC²), Department of Civil & Environmental EngineeringUniversity of CaliforniaLos AngelesUSA
  2. 2.School of Sustainable Engineering and the Built EnvironmentArizona State UniversityTempeUSA
  3. 3.California Nanosystems Institute (CNSI)University of CaliforniaLos AngelesUSA

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