Communication Dans Un Congrès Année : 2025

SALT CRYSTALLIZATION CHARACTERIZATION WITHIN POROUS NETWORK OF SAVONNIERES LIMESTONE COMBINING RAMAN AND AFM

Résumé

Salt crystallization within the heritage stones is recognized as a major cause of damage. In particular, sodium sulfates which are very commonly encountered in natural environment, are recognized as the most destructive salts. The mechanisms leading to the stone damage are still not well defined. The identification of the salt crystallization sequence and of the spatial distribution at the pore scale, remain a real scientific challenge. The sodium sulfate crystallization within true natural porous network is studied at pore scales during weathering cycles. Savonnières limestone samples are exposed to salt by successive imbibition and evaporation of a 1 mol/L sodium sulfate solution at constant ambient temperature and relative humidity conditions. Phases characterization and topography cartographies are performed using Raman spectroscopy and Atomic Force Microscopy respectively. The two combined technics on a same limestone sample help to characterize the spatial distribution of neocrystallized salt phases within the porous network. The results shown that the micro and the macropores of the limestones are mainly filled by thenardite phase V microcrystals. Large crystals of mirabilite could be formed in the stone before the dehydration. Gypsum crystals have been observed too and are located in the micropores of the limestone: at interfacial zones between oolites and sparitic cement and also in the micropores of the oolites. The presence of gypsum could indicate a chemical reaction between the sodium sulfate solution and the limestone.

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Dates et versions

hal-05272569 , version 1 (22-09-2025)

Identifiants

  • HAL Id : hal-05272569 , version 1

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Clément Mathieu, Jérôme Wassermann, Sébastien Péralta, Ronan Hébert, Pierre M. Adler, et al.. SALT CRYSTALLIZATION CHARACTERIZATION WITHIN POROUS NETWORK OF SAVONNIERES LIMESTONE COMBINING RAMAN AND AFM. Stone 2025 15th International Congress on the Deterioration and Conservation of Stone, Sep 2025, Paris, France. ⟨hal-05272569⟩
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