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

Aditya Kumar, Sabrina Ketel, Kirk Vance, Tandre Oey, Narayanan Neithalath, Gaurav Sant

Research output: Contribution to journalArticleScientificpeer-review

24 Citations (Scopus)

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 (μg) 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.
Original languageEnglish
Pages (from-to)69-98
JournalTransport in Porous Media
Volume103
Issue number1
DOIs
Publication statusPublished - May 2014
MoE publication typeA1 Journal article-refereed

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Steam
Water vapor
Sorption
Hysteresis
Isotherms
Vapors
Portland cement
Ointments
Transport properties
Desorption
Drying
Moisture
Salts
Porosity
Adsorption
Fluids
Water

Cite this

Kumar, Aditya ; Ketel, Sabrina ; Vance, Kirk ; Oey, Tandre ; Neithalath, Narayanan ; Sant, Gaurav. / Water Vapor Sorption in Cementitious Materials—Measurement, Modeling and Interpretation. In: Transport in Porous Media. 2014 ; Vol. 103, No. 1. pp. 69-98.
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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 (μg) 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.",
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Water Vapor Sorption in Cementitious Materials—Measurement, Modeling and Interpretation. / Kumar, Aditya; Ketel, Sabrina; Vance, Kirk; Oey, Tandre; Neithalath, Narayanan; Sant, Gaurav.

In: Transport in Porous Media, Vol. 103, No. 1, 05.2014, p. 69-98.

Research output: Contribution to journalArticleScientificpeer-review

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