Matches in UGent Biblio for { ?s ?p Deposition of air pollutants and biological growth on cementitious materials are common phenomena, which by staining or colour changes decrease aesthetic quality. Different strategies can be used for prevention of fouling, such as application of water repellents and/or biocides. A modular setup was designed which allows the simultaneous evaluation of different product formulations applied on concrete or stone. Algal fouling can be evaluated by means of colorimetric and image analysis. For white concrete, application of water repellents or biocides allowed to eliminate algal fouling. For autoclaved aerated concrete (AAC), which has a high bioreceptivity, the best performance was obtained with a combination of a water repellent and a biocide. Self-cleaning properties can alos be obtained by application of coating with photocatalytic TiO2 particles. When exposed to UV radiation, titanium dioxide will form highly reactieve species like the hydroxyl radical and the superoxide radical-anion, showing strong ability to degrade micro-organisms and pollutants. It was also found that TiO2 films developed a superhydrophilic behaviour under UV light exposure. In our group, the application of TiO2 on cementitious materials using different coating technique, is studied.. }
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- aggregation abstract "Deposition of air pollutants and biological growth on cementitious materials are common phenomena, which by staining or colour changes decrease aesthetic quality. Different strategies can be used for prevention of fouling, such as application of water repellents and/or biocides. A modular setup was designed which allows the simultaneous evaluation of different product formulations applied on concrete or stone. Algal fouling can be evaluated by means of colorimetric and image analysis. For white concrete, application of water repellents or biocides allowed to eliminate algal fouling. For autoclaved aerated concrete (AAC), which has a high bioreceptivity, the best performance was obtained with a combination of a water repellent and a biocide. Self-cleaning properties can alos be obtained by application of coating with photocatalytic TiO2 particles. When exposed to UV radiation, titanium dioxide will form highly reactieve species like the hydroxyl radical and the superoxide radical-anion, showing strong ability to degrade micro-organisms and pollutants. It was also found that TiO2 films developed a superhydrophilic behaviour under UV light exposure. In our group, the application of TiO2 on cementitious materials using different coating technique, is studied.".