(CS1.2) Évaluation de la performance de l’élimination par cataplasme chimique des traitements hydrofuges à base de silane et de siloxane sur des briques moulées à la main

Cette recherche vise à évaluer l'efficacité des méthodes chimiques dans l'élimination des revêtements hydrofuges sur les substrats en briques fabriquées à la main. This investigation is imperative given the widespread inappropriate application of hydrophobic materials over the past five decades, necessitating their removal due to resultant damage to the brick substrates. Additionally, there is a growing need to ascertain if penetrating water repellent treatments are retreatable and compatible, particularly for their continued use in preservation treatments for historical buildings.

The research employs solvent-based and alkaline-based chemical removal techniques, combined with poultice application, to eliminate silane & siloxane water-based water repellent treatments from brick surfaces. Through analysis encompassing physical examination (microscope observation and ultraviolet-light observation), hydrophobicity assessment (water vapor transmission test by ASTM and water absorption RILEM test) and chemical analysis by using reflectance (FT-) IR spectroscopy, the primary objective is to assess the effectiveness of various chemical products and also the harmful effects on the brick substrate. This research is still in process and will be finished by May, 2024. The data and conclusions are in discussion.