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The roles of hydration and evaporation during the drying of a cement paste by localized NMR

Abstract : The moisture distribution during the setting of a thin mortar layer can be particularly complex to manage under dry (20% RH) and hot weather (above 25 degrees C) conditions. To better understand the fundamental phenomena at stake, we used static gradient relaxation NMR tools such as Profile MOUSE and STRAFI. This allowed disentangling the mutual effect of evaporation and self-desiccation by hydration. The interest of combining the two techniques is that the capillary water is observed with the MOUSE while STRAFI reveals quantitatively the build-up of the hydrate gel nanostructure. Spatially resolved and 2D relaxation exchange experiments on a model white cement paste revealed that although evaporation induced a capillary water gradient, the kinetics of the building of the pore structure and its homogeneity remained unaffected
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https://hal.sorbonne-universite.fr/hal-01537697
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Submitted on : Wednesday, January 20, 2021 - 9:51:17 AM
Last modification on : Saturday, June 5, 2021 - 11:26:02 PM
Long-term archiving on: : Wednesday, April 21, 2021 - 6:16:10 PM

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Maxime van Landeghem, Jean-Baptiste d'Espinose, Bernhard Blümich, Jean-Pierre Korb, Bruno Bresson. The roles of hydration and evaporation during the drying of a cement paste by localized NMR. Cement and Concrete Research, Elsevier, 2013, 48, pp.86 - 96. ⟨10.1016/j.cemconres.2013.01.012⟩. ⟨hal-01537697⟩

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