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Application of water vapor sorption measurements for porosity characterization of hardened cement pastes
Highlights Important factors influencing the sorption data analysis are reviewed. Water vapor sorption studies are applied to cement pastes and MCM-41. The specific surface area results depend on the considered adsorption equation. Pore size distribution curves derived from both sorption isotherms are compared. The network theory can be used to explain some of results.
Abstract Water vapor sorption can be used to study important properties of porous materials including specific surface area and pore size distribution (PSD). However, the data analysis is somewhat inconsistent in literature. In this work, the important factors influencing the analyzed results using sorption data were reviewed. Water vapor sorption measurements were then applied to two hardened cement pastes and one model porous material MCM-41. The specific surface area was calculated based on different equations accounting for multilayer adsorption and the PSD was analyzed from both the absorption and the desorption isotherms for comparison. The calculated specific surface area was quite dependent on which equation is considered for multilayer adsorption. For the studied hardened cement pastes, three characteristic peaks were found in the calculated PSD curves from the desorption isotherms with corresponding radii of 1.4, 1.8 and 3.0nm while the peak at 1.4nm was missing in the PSD curves calculated from the absorption isotherm. The network theory, suggesting desorption is controlled by the pore entry sizes while absorption is controlled by the interior pore sizes, can be used to explain some of the results.
Application of water vapor sorption measurements for porosity characterization of hardened cement pastes
Highlights Important factors influencing the sorption data analysis are reviewed. Water vapor sorption studies are applied to cement pastes and MCM-41. The specific surface area results depend on the considered adsorption equation. Pore size distribution curves derived from both sorption isotherms are compared. The network theory can be used to explain some of results.
Abstract Water vapor sorption can be used to study important properties of porous materials including specific surface area and pore size distribution (PSD). However, the data analysis is somewhat inconsistent in literature. In this work, the important factors influencing the analyzed results using sorption data were reviewed. Water vapor sorption measurements were then applied to two hardened cement pastes and one model porous material MCM-41. The specific surface area was calculated based on different equations accounting for multilayer adsorption and the PSD was analyzed from both the absorption and the desorption isotherms for comparison. The calculated specific surface area was quite dependent on which equation is considered for multilayer adsorption. For the studied hardened cement pastes, three characteristic peaks were found in the calculated PSD curves from the desorption isotherms with corresponding radii of 1.4, 1.8 and 3.0nm while the peak at 1.4nm was missing in the PSD curves calculated from the absorption isotherm. The network theory, suggesting desorption is controlled by the pore entry sizes while absorption is controlled by the interior pore sizes, can be used to explain some of the results.
Application of water vapor sorption measurements for porosity characterization of hardened cement pastes
Wu, Min (author) / Johannesson, Björn (author) / Geiker, Mette (author)
Construction and Building Materials ; 66 ; 621-633
2014-06-04
13 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2014
Porosity of hardened Portland cement pastes
| Engineering Index Backfile | 1956
Hardened cement pastes of low porosity -- Exploratory studies
| Engineering Index Backfile | 1968