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Considerations for reconstruction of a bridge exhibiting staining / Cynthia O'Malley in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 4 (04/2018)
[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 multicouchesIndex. 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 rivetEn 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[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19882 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Construction chemicals Q & A forum Type de document : texte imprimé Auteurs : Harish Agrawal, Auteur Année de publication : 2020 Article en page(s) : p. 125 Langues : Anglais (eng) Catégories : Bois -- Revêtements
Cires
Efflorescence
Expertises
Revêtements -- Défauts:Peinture -- Défauts
Revêtements en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits En ligne : https://drive.google.com/file/d/1-Fly3Q0yhsx4-l_uKXUcBL9wCkU3Tbrn/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35210
in PAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 125[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22556 - Périodique Bibliothèque principale Documentaires Disponible Contradictory information in a project specification / Chrissy Stewart in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 9 (09/2016)
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Titre : Contradictory information in a project specification : coating failure on the interior of a wastewater digester Type de document : texte imprimé Auteurs : Chrissy Stewart, Auteur Année de publication : 2016 Article en page(s) : p. 20-25 Langues : Américain (ame) Catégories : Analyse des défaillances (fiabilité)
Eaux usées -- Stations de traitements
Expertises
Revêtements -- Défauts:Peinture -- Défauts
Revêtements protecteurs -- DétériorationIndex. décimale : 667.9 Revêtements et enduits Résumé : The wastewater industry poses some of the most significant corrosion protection challenges for industrial protective coatings. In this case study, coating failure in the form of peeling and delamination (on concrete) and blistering (on steel) was observed on the interior of a digester at a wastewater treatment facility after only five years of service. Removal of sludge from the digester revealed disbonded pieces of coating, which alerted the facility owner to the failure. Due to the relatively short period of coating performance and the importance of a properly protected substrate, an investigation into the cause of the premature coating failure was undertaken.
The digester consisted of a concrete shell with a steel skirt plate situated at the top of the shell. A steel dome was attached to the skirt plate. The specification indicated that the operating temperature of the digester ranges from 95-to-131 F, and that a single coat was to be applied at a dry film thickness (DFT) of 125 mils on the concrete and 60 mils on the steel substrates. The specification listed several polyurethane coating materials that were deemed suitable for this environment. The coating selected for installation was one of the materials listed in the specification. The manufacturer’s product data sheet (PDS) listed a maximum service temperature of 120 F for immersion service and 180 F for dry conditions.
Because the contents in the digester were composed of sludge from a wastewater treatment plant, the environment would be considered immersion. The sludge included a mixture of organic and inorganic solids, grit, grease, scum and industrial solvents. Reportedly, small quantities of hydrogen sulfide, hydrogen and nitrogen gases were likely to be present as well. The design engineer for the digester reported that the contents were uniformly mixed to maintain consistent pH and temperature throughout the digester. Since the time that the selected coating material had been applied, the pH readings were reasonably close to 8 and the temperature ranged from 122-to-126 F.Note de contenu : - Site investigation
- Laboratory investigation
- Summary of the site investigation and forensic evidence
- FIGURES : 1. Cross section of sample removed below operating level - 2. Cross-section of sample removed above operating levelEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=5923 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28391
in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 33, N° 9 (09/2016) . - p. 20-25[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18361 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Convective flow and defects Type de document : texte imprimé Auteurs : Clifford K. Schoff, Auteur Année de publication : 2018 Article en page(s) : p. 76 Langues : Américain (ame) Catégories : Revêtement -- Séchage:Peinture -- Séchage
Revêtements -- Défauts:Peinture -- DéfautsIndex. décimale : 667.9 Revêtements et enduits Résumé : After a coating is applied, there is a period when the film is still liquid. Evaporation of solvent or water cools the surface and entry into an oven heats the surface. In either case, a combination of density and surface tension differences can cause convective flow within the film as shown in Figure 1. Material moves from the coating-substrate interface, rises to the surface, then drops back down. The motion continues until the coating has dried or cured enough to raise the viscosity to a level that stops flow. In multi-pigment systems, one of the pigments rising with the flow may be trapped at the surface producing the defects called flooding and floating. If that pigment completely covers the surface or has become the major component of the pigment mix at the surface, the result is a darker or lighter shade of uniform color. We usually call this flooding. Rubbing the wet paint with a finger (known as rub-up) will show that the surface color is different from the interior of the layer. Partial coverage by one pigment resulting in ugly streaks or mottled regions is called floating, although both defects sometimes are labeled as floating since, in both cases, pigment is floating to the surface. Flooding and floating both produce unacceptable color effects. Note de contenu : - Fig. 1 : Diagram of convective flow showing the up and down pattern of motion
- Fig. 2 : Example of a network of Bénard cells
- Fig. 3 : Bénard cells in a white can coatingEn ligne : https://drive.google.com/file/d/1GOTN5P9DIU2ogYQEXOQxaf0J6b1yBfZA/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30628
in COATINGS TECH > Vol. 15, N° 3 (03/2018) . - p. 76[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19761 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Counting craters : A digital assistant for quantifying coating defects Type de document : texte imprimé Auteurs : Julian Rixrath, Auteur ; Philipp Isken, Auteur Année de publication : 2023 Article en page(s) : p. 38-43 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse numérique
Antimousse
Comptage
Cratère (défaut)
Revêtements -- Analyse:Peinture -- Analyse
Revêtements -- Défauts:Peinture -- DéfautsIndex. décimale : 667.9 Revêtements et enduits Résumé : Routine laboratory work is often time-consuming and can limit the scope for innovation. Such work includes analysing and evaluating coated samples for the purpose of selecting ideal formulations. A digital assistant for complex evaluations would increase the efficiency of these tasks and enable coating defects to be quantified objectively. Note de contenu : - Sustainability driving innovation
- Manual evaluations are subjective
- Computer quantification of defects takes seconds
- Practical example : defoaming of architectural coatings
- Eliminating foam effectively : striking the right balance
- Digital detection
- Comparison of detection results with manual evaluation
- An everyday laboratory example
- Computer vision boosts efficiency
- Digitisation and sustainability go hand in handEn ligne : https://drive.google.com/file/d/1YI59J-BhoSO2vGTZBRMywROMKvSDwOZl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38737
in EUROPEAN COATINGS JOURNAL (ECJ) > (01-02/2023) . - p. 38-43[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23833 - Périodique Bibliothèque principale Documentaires Disponible 23831 - Périodique Bibliothèque principale Documentaires Disponible Craters and cratering revisited in COATINGS TECH, Vol. 9, N° 4 (04/2012)
PermalinkLes défauts des peintures : origines, identification et remèdes / Association Française des Techniciens des Peintures, Vernis, Encres et Adhésifs / Paris : AFTPVA (1998)
PermalinkDefects on coated steel in CED coating / Shivam Madukar Tembelkar in PAINTINDIA, Vol. LXXII, N° 2 (02/2022)
PermalinkDefects on coated steel in CED coating : a review / Shivam Madhukar Tembekar in PAINTINDIA, Vol. LXIX, N° 12 (12/2019)
PermalinkLes désordres rencontrés en protection anticorrosion / Wolf Dieter Kaiser / Offranville : Eurocol - Edition (2000)
PermalinkDetermination of changes in mass and volume of linseed oil during drying / Peter Svane in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B4 (12/2006)
PermalinkDevelopment of a visual inspection system and the corresponding algorithm for the detection and subsequent classification of paint defects on car bodies in the automotive industry / Kim Katharina Kieselbach in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 4 (07/2019)
PermalinkDifferential scanning calorimetry / Dwight G. Weldon in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 31, N° 6 (06/2014)
PermalinkDisbonded coating and cathodic protection shielding for pipelines and utility poles / Mehrooz Zamanzadeh in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 7 (07/2017)
PermalinkEffect of pH and current density on the electrodeposition of Zn-Ni-Fe alloys from a sulfate bath / Mortaga M. Abou-Krisha in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 6 (11/2012)
PermalinkEfflorescence in exterior paints - Causes and its prevention / Girish A. Bhagwat in PAINTINDIA, N° annuel 2002 (2002)
PermalinkEliminating bubbles on polyamide strips in INTERNATIONAL SURFACE TECHNOLOGY (IST), Vol. 7, N° 3 (2014)
PermalinkEvaluation of several finishes on severely weathered wood / R. Sam Williams in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 895 (08/1999)
PermalinkField application of foul-release coating / Sang Ki Chi in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 31, N° 6 (06/2014)
PermalinkFlooding and floating in latex paint / Huang Ying in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 1, N° 3 (07/2004)
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