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Water sorption isotherms and hysteresis of cement paste at moderately high temperature, up to 80 °C

Wang, Jiayi, Yio, Marcus H.N., Zhou, Tingtao, Wong, Hong S., Davie, Colin T. and Masoero, Enrico 2023. Water sorption isotherms and hysteresis of cement paste at moderately high temperature, up to 80 °C. Cement and Concrete Research 165 , 107076. 10.1016/j.cemconres.2022.107076

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The constitutive models of concrete often consider water desorption isotherms to be near-equilibrium and significantly affected by moderately high temperature, 40–80, typically through microstructural changes. However literature data suggest that adsorption, not desorption, is near-equilibrium and moderate temperatures do not cause microstructural changes. This work supports the latter theory, through dynamic vapor sorption experiments on cement paste at 20–80. Samples were pre-conditioned at 60% relative humidity and 20, and isotherms were measured for several humidity ranges and testing rates. The results, corroborated by classical 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 water at low humidity. Starting from the second cycle, desorption at higher temperatures features a shift of the cavitation pressure and overall a smaller hysteresis. A conceptual model of pore-specific temperature-dependent hysteresis is proposed to qualitatively explain the results.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 0008-8846
Funders: Engineering and Physical Sciences Research Council
Date of First Compliant Deposit: 20 January 2023
Date of Acceptance: 21 December 2022
Last Modified: 06 Jan 2024 02:11

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