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 language | English (US) |
|---|---|
| Pages (from-to) | 69-98 |
| Number of pages | 30 |
| Journal | Transport in Porous Media |
| Volume | 103 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2014 |
Fingerprint
Keywords
- BET
- Desorption
- Hysteresis
- Sorption
- Surface area
- Water vapor
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
Cite this
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, 2014, p. 69-98.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Water Vapor Sorption in Cementitious Materials-Measurement, Modeling and Interpretation
AU - Kumar, Aditya
AU - Ketel, Sabrina
AU - Vance, Kirk
AU - Oey, Tandre
AU - Neithalath, Narayanan
AU - Sant, Gaurav
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
KW - BET
KW - Desorption
KW - Hysteresis
KW - Sorption
KW - Surface area
KW - Water vapor
UR - http://www.scopus.com/inward/record.url?scp=84897963943&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84897963943&partnerID=8YFLogxK
U2 - 10.1007/s11242-014-0288-5
DO - 10.1007/s11242-014-0288-5
M3 - Article
AN - SCOPUS:84897963943
VL - 103
SP - 69
EP - 98
JO - Transport in Porous Media
JF - Transport in Porous Media
SN - 0169-3913
IS - 1
ER -