TY - CONF A1 - Müller, Urs A1 - Malaga, Katarina T1 - Study on the application of anti-graffiti systems on natural stones and concrete N2 - The goal of this study was to find a correlation between cleaning efficacy of substrates protected with anti-graffiti systems (AGS) and their porosity, surface roughness, and composition as well as usability of the Technical Testing Guideline for Anti-Graffiti Systems (TP-AGS, issued by BASt) for natural stone and brick/clinker masonry. The results showed that the cleaning efficacy mainly depends on the porosity of the substrate and the type of AGS. Also, higher surface roughness contributed to a lower cleaning efficacy. The results showed also that concrete panels and cement joints in masonry represented the worst case. The color change of all substrate materials compared to concrete was mostly within acceptable limits. Gloss changes were significant for a number of substrates. In particular, several of the wax-treated low-porosity substrates exceeded the threshold value of 10. The limit of water vapor permeability of the AGS prescribed in the TP-AGS might be too high for natural stone substrates. In general, the TP-AGS is useful for the determination of the efficiency factor of anti-graffiti agents on various substrates. T2 - Hydrophobe VI - 6th International conference on water repellent treatment of building materials CY - Rome, Italy DA - 12.05.2011 KW - Anti-graffiti KW - Permanent KW - Sacrificial KW - Stones KW - Concrete KW - Cleaning efficiency PY - 2011 SN - 978-3-931681-99-9 SP - 167 EP - 180 PB - Aedificatio Publishers AN - OPUS4-23719 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -