[article]
| Titre : |
Testing organic and organic–inorganic fluorinated hybrid coatings as protective materials for clay bricks |
| Type de document : |
texte imprimé |
| Auteurs : |
Simonetta Lucia Pagliolico, Auteur ; Elena Daniela Ozzello, Auteur ; Guido Sassi, Auteur ; Roberta Bongiovanni, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 81-92 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Argile
Briques
Capillarité
Humidité -- Absorption:Eau -- Absorption
Perfluoropolyéther
Revêtements protecteurs
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The durability of brickworks, used as facing bricks, parapets, or chimneys, is a crucial aspect of the maintenance of buildings. Water absorption and penetration due to wind-driven rain, water rundown, and capillary rising can cause serious damages and a premature deterioration of porous clay bricks, and a significant increase in their thermal conductivity. Protective coatings for brickwork must provide enhanced hydrophobic properties without affecting moisture regulation and breathability of masonry. In the present work, a standardized type of facing clay brick was treated with two types of hydrophobic coatings based on a commercial perfluoropolyether oligomer containing alkoxysilane terminal groups, respectively, with or without an inorganic precursor, tetraethoxysilane, to generate in situ silica nanoparticles. The performance of the coating was assessed by multiple indicators, such as wetting delay, water absorption coefficient, protection degree by capillarity, contact angle, roughness and gloss, as a function of the amount of coating. Uncertainties analysis of indicators was carried out. Coating performance was assessed at different exposure times comparable to in situ real ones. Optimal amounts of coating were established to maximize the protection with the minimum quantity of polymer. As a result, a square meter of brick surface exposed to water for 2–4 h can absorb about 7–8 L of water. Very small amounts of PFPE coatings change the brick surface/water interactions, more than halving the absorbed water (0.5–2 l) and increasing the protection degree up to 80–100%. After longer exposure times, the reduction in absorbed water is basically higher when brick specimens are treated with organic/inorganic nanostructured hybrid PFPE coatings. |
| Note de contenu : |
- EXPERIMENTAL : Materials and methods - Characterization of water capillary absorption - Characterization of the bricks surface
- RESULTS AND DISCUSSION : Characterization of untreated bricks - Amount of water repellent applied - Characterization of treated specimens - Effectiveness of coatings |
| DOI : |
10.1007/s11998-018-0102-3 |
| En ligne : |
https://link.springer.com/article/10.1007/s11998-018-0102-3 |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31967 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 1 (01/2019) . - p. 81-92
[article]
|
Aller sur edunet
Accueil
Testing organic and organic–inorganic fluorinated hybrid coatings as protective materials for clay bricks in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 1 (01/2019)
