[article]
| Titre : |
Considerations for reconstruction of a bridge exhibiting staining |
| Type de document : |
texte imprimé |
| Auteurs : |
Cynthia O'Malley, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 13-17 |
| Langues : |
Américain (ame) |
| Catégories : |
Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Anticorrosifs
Anticorrosion
Copolymère silicone acrylique
Epoxydes
Expertises
Métaux -- Revêtements protecteurs
Ponts -- entretien et réparations
Ponts métalliques -- Revêtements protecteurs
Revêtements -- Défauts:Peinture -- Défauts
Revêtements multicouches
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
When a large-scale bridge is in need of significant reconstruction, many factors should be considered prior to initiation of the project.
Part of this particular reconstruction involved repainting of the structural steel on a 40-foot-wide lift bridge that had a total length (including approaches) of 2,877 feet, with a main span of 418 feet. The coating system selected consisted of four coats: a zinc primer coat, a tie-coat, one coat of epoxy and an acrylic polysiloxane topcoat with high gloss.
The coating system was applied during the winter, spring and summer of 2008. Sometime after the topcoat was applied to the bridge, staining was noticed in numerous areas. These stains appeared as spots and streaks and were observed on various locations of the bridge, but the most concentrated areas were on the north side. The owner, through a recommendation of the prime engineer, contracted an independent, third-party consultant to investigate the staining problem and determine the cause in order to prepare for further rehabilitation. |
| Note de contenu : |
- Field investigation-
- Laboratory analysis and discussion
- Fig. 1 : Close-up of stain around particle embedded in the topcoat
- Fig. 2 : Streaks of staining on one of the bridge lift towers
- Fig. 3 : Staining on north box chord
- Fig. 4 : Severe staining on north fascia
- Fig. 5 : Close-up of stain streak in sample area
- Fig. 6 : Close-up of stain underneath rivet |
| En ligne : |
https://www.paintsquare.com/archive/?fuseaction=view&articleid=6288 |
| Format de la ressource électronique : |
Web |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30684 |
in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 35, N° 4 (04/2018) . - p. 13-17
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Considerations for reconstruction of a bridge exhibiting staining in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 4 (04/2018)
