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The effect of sea tides on historical brickwork in Venice

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Abstract

The conditions of historical brickwork in Venice are very peculiar indeed because the presence of seawater influences, directly or indirectly, the wall systems. We have initiated a study concerning the physical and chemical effects of water on the brick walls along the canals, which are usually submerged during the sea high tide. The situation examined is the worst one, since both the cyclic contact of brickwork with water and the physical effect of wave movements occur concurrently. Chemical analyses and porosity measurements have been performed on samples taken from walls of different age and exposed differently to the tidal waters. Tests have been performed on, the samples at various depths, in order to evaluate the changes in the parameters and to define the relationships among the physical and chemical processes leading to the decay of the material.

Resume

La situation des maçonneries historiques de Venise est vraiment très particulière étant donné que la présence de l'eau de mer influe directement ou indirectement sur l'ensemble des murs. Nous venons de commencer une étude concernant les effets physiques et chimiques de l'eau sur les murs de briques le long des canaux, qui sont exposés de façon régulière à la marée. La situation considérée est la pire étant donné que le contact cyclique de l'eau avec la maçonnerie se produit en même temps que l'action physique due au mouvement des vagues. Les analyses chimiques et les mesures de porosité ont été exécutées sur des échantillons prélevés sur des murs d'âges différents et diversement exposés au flux des vagues. Tous les essais ont été faits à différentes profondeurs de façon à évaluer la modification des paramètres et définir les relations entre les processus physiques et chimiques entraînant la détérioration du matériau.

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Bakolas, A., Biscontin, G. & Zendri, E. The effect of sea tides on historical brickwork in Venice. Materials and Structures 27, 353–358 (1994). https://doi.org/10.1007/BF02473428

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