Imperial College London
Portrait Picture

Professor Hong S. Wong

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Concrete Materials
 
 
 
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Contact

 

+44 (0)20 7594 5956hong.wong Website

 
 
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Assistant

 

Ms Ruth Bello +44 (0)20 7594 6040

 
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Location

 

228DSkempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wang:2023:10.1016/j.cemconres.2022.107076,
author = {Wang, J and Yio, MHN and Zhou, T and Wong, HS and Davie, CT and Masoero, E},
doi = {10.1016/j.cemconres.2022.107076},
journal = {Cement and Concrete Research},
pages = {1--12},
title = {Water sorption isotherms and hysteresis of cement paste at moderately high temperature, up to 80 °C},
url = {http://dx.doi.org/10.1016/j.cemconres.2022.107076},
volume = {165},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The constitutive models of concrete often consider water desorption isotherms to be near-equilibrium andsignificantly affected by moderately high temperature, 40–80C, typically through microstructural changes.However literature data suggest that adsorption, not desorption, is near-equilibrium and moderate temperaturesdo not cause microstructural changes. This work supports the latter theory, through dynamic vapor sorptionexperiments on cement paste at 20–80C. Samples were pre-conditioned at 60% relative humidity and 20C,and isotherms were measured for several humidity ranges and testing rates. The results, corroborated byclassical DFT simulations, indicate that adsorption is near-equilibrium and mostly unaffected by temperature,whereas desorption is out-of-equilibrium due to the ink-bottle effect at high humidity, and interlayer waterat low humidity. Starting from the second cycle, desorption at higher temperatures features a shift of thecavitation pressure and overall a smaller hysteresis. A conceptual model of pore-specific temperature-dependenthysteresis is proposed to qualitatively explain the results.
AU  - Wang,J
AU  - Yio,MHN
AU  - Zhou,T
AU  - Wong,HS
AU  - Davie,CT
AU  - Masoero,E
DO  - 10.1016/j.cemconres.2022.107076
EP  - 12
PY  - 2023///
SN  - 0008-8846
SP  - 1
TI  - Water sorption isotherms and hysteresis of cement paste at moderately high temperature, up to 80 °C
T2  - Cement and Concrete Research
UR  - http://dx.doi.org/10.1016/j.cemconres.2022.107076
UR  - https://www.sciencedirect.com/science/article/pii/S0008884622003684?via%3Dihub
UR  - http://hdl.handle.net/10044/1/101464
VL  - 165
ER  -
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