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Influence des propriétés physico-mécaniques des minéraux argileux dans l'altération de la pierre monumentale

Mathilde Tiennot 1
1 LRMH - Laboratoire de recherche des monuments historiques
CRC - Centre de Recherche sur la Conservation
Abstract : Flaking is a deterioration pattern widely observed on monumental stone heritage. This pattern is due to the initiation and propagation of a crack subparallel to the surface of the stone exposed to natural weathering. This research aims to better understand the alteration mechanisms and to determine the parameters involved in such crack initiation within monumental stones. A fracture mechanics approach is proposed and the influence of clay minerals on this detachment alteration is discussed. The research is carried out on three stones, a molasse, a sandstone and a kersantite, showing scaling effect when submitted to natural conditions. Their hydromechanical behaviour is studied with respect to their natural anisotropy. Elastic properties, tensile strength and toughness are measured after saturation, at various RH values during humidification and drying, and after several cycles. Wave propagation combined with dilatation measurements is used to follow damage during the RH variations cycles. The influence of clay minerals on alteration processes is verified. These phases are critical factors of stone degradation as they are weakness planes leading to damage and cracking, especially generated by their swelling.
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Submitted on : Thursday, September 14, 2017 - 3:56:02 PM
Last modification on : Monday, May 25, 2020 - 12:02:50 PM
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2017PA066036.pdf
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  • HAL Id : tel-01587726, version 1

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Mathilde Tiennot. Influence des propriétés physico-mécaniques des minéraux argileux dans l'altération de la pierre monumentale. Mécanique des matériaux [physics.class-ph]. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066036⟩. ⟨tel-01587726⟩

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