Evaluating the effectiveness of self-cleaning products applied on external thermal insulation composite systems (ETICS) / Ana Sofia Silva in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1437-1448 Titre : Evaluating the effectiveness of self-cleaning products applied on external thermal insulation composite systems (ETICS) Type de document : texte imprimé Auteurs : Ana Sofia Silva, Auteur ; Giovanni Borsoi, Auteur ; João Luís Parracha, Auteur ; Inês Flores-Colen, Auteur ; Rosario Veiga, Auteur ; Paulina Faria, Auteur ; Amélia Dionísio, Auteur Année de publication : 2022 Article en page(s) : p. 1437-1448 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Applications extérieures Dioxyde de titane Isolation thermique Nanoparticules Photocatalyse Revêtement auto-nettoyant:Peinture auto-nettoyante Revêtements -- Additifs:Peinture -- Additifs Revêtements protecteurs Tests d'efficacité Index. décimale : 667.9 Revêtements et enduits Résumé : External thermal insulation composite systems (ETICS) have been extensively applied on building façades with the aim of implementing the thermal and aesthetical properties of the building envelope. However, the formation of stains and deposition of particulate matter is often observed in the surface of these systems. The use of multifunctional products with self-cleaning properties can reduce surface anomalies and thus enhance the durability of ETICS. This study aims at evaluating the effectiveness of three protective coatings with self-cleaning additives (i.e., TiO2 nanoparticles), when applied on the surface of ETICS. Three different stains (rhodamine, methylene blue and silver paint aerosol) were applied on the ETICS finishing coat, evaluating the removal of these stains after exposure to natural (solar radiation) light source. The surface properties (compactness, hardness, roughness, gloss, and color) of the ETICS were evaluated prior and after sun exposure. Results showed that the application of the three products lead to a modification of the surface properties (compactness, hardness, gloss, roughness) of the ETICS specimens, and sensibly enhance the self-cleaning, hydrophobic and aesthetical properties of the ETICS. Note de contenu : - MATERIALS AND METHODS : ETICS specimens - Protective coatings - Application protocol - Surface properties - Morphological and microstructural characterization - Self-cleaning test - RESULTS : Surface properties - Morphological and microstructural analysis - Self-cleaning test - Table 1 : Physical features and amount of product used in the application of the protective coatings - Table 2 : Mean values and standard deviations of the ultrasonic propagation speed (Sp), surface hardness, surface gloss, surface roughness, and contact angle (θ) of the untreated (P0) and treated (P1, P2, P3) ETICS specimens DOI : https://doi.org/10.1007/s11998-022-00617-x En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00617-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38281 [article]

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The influence of hydrophobic protection on building exterior claddings / Carlos Esteves in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1379-1388 Titre : The influence of hydrophobic protection on building exterior claddings Type de document : texte imprimé Auteurs : Carlos Esteves, Auteur ; Hawreen Ahmed, Auteur ; Inês Flores-Colen, Auteur ; Rosario Veiga, Auteur Année de publication : 2019 Article en page(s) : p. 1379-1388 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Applications extérieures Capillarité Composites Essais (technologie) Humidité -- Absorption:Eau -- Absorption Hydrophobie Isolation thermique Mortier Oligomères Perméabilité Pierre Revêtement mural Revêtements en bâtiment Séchage Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 667.9 Revêtements et enduits Résumé : This study presents the results of an experimental campaign with the aim of investigating the hydrophobic protection of three substrates (stone, render, and external thermal insulation composite system—ETICS) with the application of three hydrophobic products: silicon and titanium dioxides-based nanostructured dispersion (HNST); a silane/oligomeric siloxane (HSila/Silox); and a siloxane (HSilox). To determine the effectiveness of the hydrophobic treatments, specimens of the untreated and treated wall coatings were characterized with different laboratory tests. The results showed that all products introduced significant improvements in the hydric properties of the substrates, leading to lower capillary water absorption (98%), water permeability with Karsten pipes (99%), drying index (39%), and higher water repellency assessed through the contact angle (283%). The application of hydrophobic materials also had a negative effect, leading to up to a 227% increase in resistance to water vapor diffusion. Among the assessed wall coatings, the rendering mortar appears to have the best initial performance after the application of all the types of hydrophobic materials tested. In general, the hydrophobic product HSilox was proved to be the most suitable for rendering mortars, while HNST was more appropriate for stone substrates. Note de contenu : - EXPERIMENTAL CAMPAIGN : Materials - Methodology - RESULTS AND DISCUSSION : Capillary water absorption and water absorption by Karsten pipes - Drying test - Water vapor permeability - Contact angle - Biological colonization - Optimization DOI : 10.1007/s11998-019-00220-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00220-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33018 [article]

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