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Multiscale study of stone decay by salt crystallization in porous networks

Abstract : Crystallization of soluble salts in porous networks is a major source of decay for natural stones. The objective of this thesis is to specify this salt decay mechanism in the particular case of sodium sulphate crystallization. The basis of this work is to follow the evolution of samples of nine sedimentary stones of various origins (two biodetritic limestones, one detritic limestone, one lacustrine limestone, three quartz-rich sandstones and two layered shaly sandstones) during accelerated ageing tests. First, the mechanism of sodium sulfate crystallization is studied thanks to thermal monitoring of the samples. Different crystallization sequences are proposed to explain the decay during the cycles. Then a new way of quantifying salt decay in the long term is proposed, taking into account the hydromechanical properties of the stones. The importance of the microstructures on decay (porous network tortuosity or connectivity, intragrain cracks) is also assessed thanks to a mercury porosimetry study. Finally, the influence of the environmental conditions on decay is also evaluated: evaporation and temperature directs both the location and amplitude of salt decay.
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Contributor : Matthieu Angeli <>
Submitted on : Tuesday, February 5, 2008 - 5:48:57 PM
Last modification on : Wednesday, December 9, 2020 - 3:10:44 PM
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  • HAL Id : tel-00239456, version 1

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Matthieu Angeli. Multiscale study of stone decay by salt crystallization in porous networks. Applied geology. Université de Cergy Pontoise, 2007. English. ⟨tel-00239456⟩

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