Hydrophobic impregnations often referred to as water repellent agents, today mainly consisting of alkylalkoxysilanes, are often used on concrete to prolong the service life of the structure. Measures prolonging the service life of a concrete structure will lead to savings of natural resources and thus both economical and environmental savings for the community. The results presented in this Lisenciate thesis will be used as input in these models in the planned second phase of this project. Fuktfixeringen i betong påverkas av en impregnering och effekten är störst vid höga RF. A semi-empirical equation is derived that gives an idea on how much these factors affect the efficient penetration depth of the water repellent agent. The last three papers deal with wood. Gerdes, Andreas Karlsruhe Institute of Technology.
The seven papers have the following contents:
De tre viktigaste faktorerna för alla impregneringsmedels inträngning i betong är tid, porositet och fuktnivå. The model accounts for different moisture flow coefficients in radial and tangential directions for both sapwood and heartwood. The seven papers have the following contents: Brinellgatan 4 62 Borås. Detta syfte uppnås genom att armeringen skyddas mot klorider eller att fukthalten inuti betongen sänks. Unlike untreated concrete, where capillary suction plays an important role for the moisture transport at high RH, the vapour transport is the dominant transport mechanism even at high RH for water repellent treated concrete. This property change can reduce chloride ingression and stop heavy rain from penetrating through the surface layer.