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Salt damage and humidification treatment of building structures

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Document pages: 13 pages

Abstract: Salt damage will greatly affect the service life of many historical and contemporary building structures. Various damage mechanisms of salt on porous building materials are reviewed in this paper. The importance of pretreatment research is discussed; Combined with knowledge of salt and water transport mechanisms, they can provide useful indications for treatment options. Salt damage treatment methods are then evaluated, including passive technologies based on environmental control, reducing water transport or conversion to less soluble salts, and active procedures leading to the removal of salt from degraded areas. The conclusion is that cellulose can still be considered as the most popular material at presenty used in desalination poultices but hydrophilic mineral wool can serve as its prospective alternative in future applications. Another important cause of building pathologies is the rising damp and, in this phenomenon, it is particularly severe considering the presence of salts in water. The treatment of rising damp in historic building walls is a very complex procedure and at Laboratory of Building Physics (LFC-FEUP) a wall base hygroregulated ventilation system was developed and patented.

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