Abstract
The utilization of data from advanced techniques, such as enhanced pattern treatment of x-ray diffraction analysis, combined with data from historical sources as well as environmental information, has been applied to diagnose the complex deterioration mechanism of a historic construction. A case history is provided dealing with a famous Italian construction in Ancona designed and erected by the Neapolitan architect Luigi Vanvitelli during 1733–1743, where both jointing and rendering mortars deteriorated very seriously. It has been found that the original lime-pozzolan mortar deteriorated due to physical events (rain water leaching, thermal changes, freezing-thawing, etc.), whereas Portland cement mortars, used to repair damaged walls, deteriorated by chemical sulfate attack.
Resume
On a utilisé les résultats de techniques avancées, comme ‘l'enhanced pattern treatment’ de l'analyse de diffraction des rayons x, combinés avec des données historiques et des informations sur l'environnement, pour diagnostiquer le mécanisme complexe de dégradation d'un édifice historique. Cet article illustre le cas d'un fameux bâtiment italien à Ancona, conçu et bâti par l'architecte napolitain Luigi Vanvitelli entre 1733 et 1743, dans lequel les mortiers tant des joints que de l'enduit se sont très gravement détériorés. On découvert que les mortiers originaux de chaux et pouzzolane se sont détériorés en raison de mécanismes physiques (ravinement, amplitudes thermiques, gel et dégel, etc.), alors que les mortiers de ciment Portland, employés pour réparer des murs détériorés ont été endommagés par l'agression sulfatique.
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Moriconi, G., Castellano, M.G. & Collepardi, M. Mortar deterioration of the masonry walls in historic buildings. A case history: Vanvitelli's Mole in Ancona. Materials and Structures 27, 408–414 (1994). https://doi.org/10.1007/BF02473445
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DOI: https://doi.org/10.1007/BF02473445