Both methods have been applied on a historical masonry of a barn in the old mill house in Hoksem Hoegaarden, Belgium. This paper deals with the state of the art of desalination of historic masonry by means of poulticing and electrophoresis, based on results of a case study. For the success of a salt extraction it has become clear that it is crucial to evaluate certain parameters before taking action. In-situ the processes of both methods remain empiric and the results are more or less random. A common used method for salt extraction is the use of poultice materials, while a more experimental technique is electrophoresis. Salts in historical masonry are a known destructive force and despite extensive research the results of desalination procedures remain unclear. Furthermore a high amount of applied product is not always beneficial to the consolidation effect and reduces the water absorption capacity substantially. The results demonstrate that a major difference in consolidating effect can be distinguished and that there is a different influence of the product type on the final water absorption capacity. The consolidation effect is assessed by results of drilling resistance measurements (DRMS) and capillary water absorption. The influence of product and application type is evaluated in terms of the quantity of absorbed product and amount of deposited gel (SiO2). The consolidation effect is related to three types of treatment applications, each time based on capillary absorption on two different types of limestone. This paper describes the results of a laboratory research carried out at KIK-IRPA that aims to better understand the behaviour of eight different ethyl silicate products. Today there is a wide variety of TEOS-based products available on the market with different compositions and it is not at all clear which product(s) are more appropriate than others for a particular case. When granular disintegration occurs, a consolidation treatment with silicone compounds, specifically ethyl silicate (tetraethoxysilane, TEOS) is often chosen in order to improve cohesion between the material particles. The loss of cohesion of stone materials, mainly caused by weathering, is a common problem in the conservation of our cultural heritage.
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