Author(s)

J. Dreyer

Abstract

The reason for the destruction of stones and elements of construction is the moisture which penetrates into the pores and destabilizes through several processes, the matrix of the construction material in the case of the moisture content of the materials is too high. The moisture content is a result of the moistening and drying processes. The frequency and quantity of this process determines the amount of moisture in a construction element. If this balance is changed, for example by increased evaporation, the moisture load will be lower and the moisture state of the construction eventually becomes harmless. In this paper the results of investigations will be presented by using a heating system in exterior and partition walls which suffer from arising moisture. The temperature of these elements increases by only a few degrees, about the temperature level of the environment to support the evaporation. The findings of this investigation are the temperature influences on capillary suction strength, viscosity, evaporation and so on. It is clear that in the case of high moisture load and low evaporation the drying effect by thermal treatment is low and in the opposite case this method will be very successful. The aim of this investigation is to find out and show the possibilities of this method, the boundary conditions of the application and the efficiency of this method. The result of the investigations is quantification of the influence of the material properties and the moisture load from subsoil and soil water on the humidification. The method is relatively successful in the case of sandstone, limestone, lime sandstone, and gas aerated concrete. For elements made of bricks this method cannot be recommended. Keywords: moisture damage, arising moisture, retrofitting of damaged construction, thermal treatment.

Keywords

moisture damage, arising moisture, retrofitting of damaged construction, thermal treatment.