Factors affecting sealer performance on concrete / Jim Reader in COATINGS TECH, Vol. 16, N° 10 (10/2019)  

[article]  inCOATINGS TECH > Vol. 16, N° 10 (10/2019) . - p. 36-42 Titre : Factors affecting sealer performance on concrete Type de document : texte imprimé Auteurs : Jim Reader, Auteur ; Gary Johnson, Auteur Année de publication : 2019 Article en page(s) : p. 36-42 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Essais (technologie) Formulation (Génie chimique) Joints d'étanchéité Liants Matériaux cimentaires -- Revêtements Polyacryliques Spectroscopie Raman Surfactants Index. décimale : 668.3 Adhésifs et produits semblables Résumé : It is often assumed that solvent-based sealers give better performance than water-based formulations on concrete because the solvent-based sealers are thought to better penetrate into the concrete matrix. In practice, it can be difficult to measure actual penetration of a sealer into concrete, as dyes and colorants used to highlight the sealer may show different migration properties than the polymeric binder. Confocal Raman spectroscopy mapping has been used to map the depth of penetration of solvent-based, 100% solids, and water-based sealers that employ acrylic and epoxy binders. This mapping shows that neither solvent-based nor water-based formulations showed any significant penetration into the concrete substrate beyond the first few microns of the open surface. A study has also been carried out using a model waterborne acrylic sealer formulation to determine whether additives might influence the penetration of the sealer into the concrete or other factors that could affect the performance of the waterborne coating. This work has shown that the addition of anti-foaming, coalescing surfactants can improve the protective properties of the coating by improving air release and increasing film network formation at the concrete surface. Note de contenu : - Fig. 1 : The concrete substrate - Fig. 2 : Color based test for sealer penetration into concrete - Fig. 3 : Penetration of solvent-free and water-based epoxy on concrete - Fig. 4 : Raman spectra of the commercial water-based sealer after drawdown and drying on a glass microscope slide and Raman spectra of the commercial solvent based sealer after drawdown and drying on a glass microscope slide - Fig. 5 : Micrograph of the concrete surface sealed with a water-based sealer and Raman map of the same area. The green rectangle indicates area mapped with 1x1 µm pixels. Intensigy of hydrocarbon band at 2391 Rcm-1 is represented by green color saturation - Fig. 6 : Micrograph of the concrete surface sealed with a solvent-based sealer and Raman map of the same area. The green rectangle indicates area mapped with 1x1 µm pixels. Intensity of hydrocarbon band at 2936 Rcm-1 is represented by green color saturation - Fig. 7 : Surface tension of water-based sealer containing different surfactants - Fig. 8 : Micrograph of the concrete surface sealed with the water-based sealer containing surfactant or non-ionic, alkyl phenol ethoxylate surfactant. The green rectangle indicates area mapped with 1x1 µm pixels. Intensity of hydrocarbon band at 2931 Rcm-1 is represented by green color saturation - Fig. 9 : Effect of different surfactants (0.9% w/w/ use level unless stated) on water spot resistance of concrete sealer formulation - Fig. 10 : Effect of different defoamers on water spot resistance of concrete sealer formulation. A Concrete darkening as water penetrates through the sealer forulated with a compatible defoamer and sealer formulated with an optimized defoamer where the water does not penetrate through the sealer - Table 1 : Operating conditions for confocal Raman microscopy of sealed concrete panels - Table 2 : Guide formulation for water-based concrete sealer (Lubrizol) En ligne : https://drive.google.com/file/d/1F6bfeejpdp2BKk7ycUiI5qBTvZNiiu-u/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33250 [article]

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