Long-term effect of weather in Dfb climate subtype on properties of hydrophobic coatings on sandstone

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27640%2F22%3A10249524" target="_blank" >RIV/61989100:27640/22:10249524 - isvavai.cz</a>
Alternative codes found
RIV/61989100:27710/22:10249524 RIV/68145535:_____/22:00564367
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S2352710222003965" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2352710222003965</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jobe.2022.104383" target="_blank" >10.1016/j.jobe.2022.104383</a>

Result language
angličtina
Original language name
Long-term effect of weather in Dfb climate subtype on properties of hydrophobic coatings on sandstone
Original language description
Hydrophobic poly(alkyl siloxane) coatings (pure and containing 0.5 wt.% of nano-ZnO) were applied by spraying on sandstone. Coated (S/P and S/PZnO) and uncoated (S) samples were characterized and exposed to weather for 545 days in Ostrava, Czech Republic, an industrial city having persistently high concentrations of particulate matter in air (PM10 ~ 20+-10 μg/m3) and belonging to the Dfb climate subtype. Despite the more distinct final colour change of S/P and S/PZnO front faces, the differences between front and back faces were significantly smaller (ΔE*F-B values of ~3.7 and ~3.1 for S/P and S/PZnO, respectively) compared to S (ΔE*F-B ~ 7.7). Correlations of colour changes with meteorological data revealed effect of relative air humidity, total precipitation, and concentration of particulate matter. Static contact angle (initial values of 137o and 142o for S/P and S/PZnO, respectively) remained >120o during the experiment, and the coatings effectively prevented the falling rainwater to soak into the sandstone. The high hydrophobicity was not accompanied by closure of pores. Despite a decrease in Zn content, no algae was observed on S/PZnO during the experiment. On S and S/P samples, the algae was found after 473 days.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20100 - Civil engineering

Project
<a href="/en/project/DG18P02OVV017" target="_blank" >DG18P02OVV017: Historical Landscape of the borderlands between Silesia and Moravia</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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