PREVENT – Le PatRimoine dans son EnVironnemENT

The durability is evaluated via the transfer properties of the building materials, and in particular the permeability (with water or air). The apparent air permeability measures the ability of the material to facilitate the circulation of the gas phases, and thus to evacuate the water (vapor) contained in the porous network, and constitutes a measure of the "breathing of the material". It is particularly impacted by the water saturation of the medium. Changes in apparent permeability can thus be considered as an indicator of saturation and desaturation phenomena in porous materials of the built heritage.
PREVENT aims at developing a method of multi-scale analysis, monitoring and prediction of the transfer properties of the materials of a built heritage subject to circulations of water in its environment. To do this, a built heritage subject to capillary upwelling -- the Gallo-Roman sanctuary of Vaux-de-la-Celle in Genainville -- is used as a pilot site for the development of large-scale experiments in situ and on a meter-scale wall reproduction in the Val d’Oise Archeological Museum (MADVO, Guiry en Vexin). In situ measurements, analog experiments are combined to 3D numerical modelling to provide a full scale tool for predicting transfer properties according to i) the nature of the materials, ii) the evolution of the damage, iii) preventive treatments, iv) restorations made.