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JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) . Vol. 35, N° 1Thin-film coatings for reinforced concrete bridgesMention de date : 01/2018 Paru le : 26/02/2018 |
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Ajouter le résultat dans votre panierStrengthening concrete and steel bridges using FRPs / Gregg Blaszak in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 1 (01/2018)
[article]
Titre : Strengthening concrete and steel bridges using FRPs Type de document : texte imprimé Auteurs : Gregg Blaszak, Auteur Année de publication : 2018 Article en page(s) : p. 16-19 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres
Ponts -- entretien et réparations
Renforts (matériaux)Index. décimale : 667.9 Revêtements et enduits Résumé : Crumbling concrete and rusting steel bridges are a common sight for anyone traveling America’s highway system. Of the 614,387 bridges in the United States, almost 40 percent are 50 years or older and about 10 percent are posted with a load restriction. In its 2017 Infrastructure Report Card, the American Society of Civil Engineers (ASCE) issued a grade of C+ for the condition of the country’s bridges. The nation’s backlog of bridge rehabilitation needs is estimated at $123 billion. The report specifically states that most bridges were designed for a lifespan of 50 years, so an increasing number will soon need major rehabilitation.
The challenges facing every state Department of Transportation (DOT) include how to get more done with less, and minimize the impact to the local community and economy. Rehabilitating to extend the life of a structurally deficient bridge is preferred over replacement. In addition, when it comes to rehabilitating bridges, many DOTs are considering cost-saving, nontraditional methods and materials to help get more done with less. Fiber-reinforced polymer (FRP) strengthening is one nontraditional method where use has grown steadily during the last 30 years and is now being adopted by more and more DOTs.
FRPs are externally bonded to, or wrapped around existing concrete structural members to provide reinforcement where additional reinforcing bars are desired. FRPs are used to restore or increase the load-carrying capacity of bridges or to improve their ability to withstand earthquakes.Note de contenu : - FRP strengthening systems
- Wet layup FRP systems
- Pre-cured FRP systems
- FRP strand sheets
- Bridge applications of FRPS : Bridge columns - Bridge piers - Bridge girders - Bridge decks - Steel bridge elements
- Figure : Properties of FRPs compared to traditional reinforcing materialsEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6234 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30363
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Code-barres Cote Support Localisation Section Disponibilité 19617 - Périodique Bibliothèque principale Documentaires Disponible Preventing crevice corrosion in new and existing steel structures / Eric Shoyer in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 1 (01/2018)
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Titre : Preventing crevice corrosion in new and existing steel structures Type de document : texte imprimé Auteurs : Eric Shoyer, Auteur ; J. Peter Ault, Auteur ; Peter McDonagh, Auteur ; Brian Prazenka, Auteur Année de publication : 2018 Article en page(s) : p. 20-32 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
Corrosion
Métaux -- Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : Bolted joints in steel structures contain multiple crevices between the bolted members and the fasteners that are typically more susceptible to corrosion than flat surfaces, and difficult to properly coat. This article will evaluate the effectiveness of various coating practices at mitigating corrosion around these joints. Note de contenu : - THE TEST APPROACH : Panel design - Weathered steel - New steel - Coating application - Caulking methods - Corrosion testing
- RESULTS : Crevice corrosion - Bolt corrosion - Disassembly - Pit depth
- TABLES : 1. Study Test Matrix - 2. Crevice Corrosion Inspection at 120 Cycles of GMW 14872 - 3. Corrosion of Black-Oxide Bolts on Panels - 4. Percentage of Galvanized Bolts Displaying Corrosion per Panel - 2. Crevice Corrosion Inspection at 120 Cycles of GMW 14872 - 3. Corrosion of Black-Oxide Bolts on Panels - 4. Percentage of Galvanized Bolts Displaying Corrosion per Panel
- FIGURES : 1. Front and back of panels after weathering - 2. Surface preparation after weathering (SSPC-SP 10 left, SSPC-SP 11 right) - 3. New steel panels (assembled prior to blast, left ; post-SSPC-SP 10 blast, center ; and SSPC-SP 10 blast and primed, then assembled right) - 4. Caulking scenarios, side view (top method, top left ; 3/4 method, top right ; and full method, bottom) - 5. One cycle of GMW 14872 - 6. New steel primed after assembly - 7. New steel primed before assembly - 8. Weathered steel, SSPC-SP 10 remediation - 9. Weathered steel, SSPC-SP 11 remediation - 10. Panels disassembled after application - 11. Minimum, average and maximum pits measured on the crevice face of the angle for panels representing new steel coating systems - 12. Minimum, average and maximum pits measured on the crevice face of the angle for panels representing weathered steel coating systems - 13. L channel before and after glass-bead blastingEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6237 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30365
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Code-barres Cote Support Localisation Section Disponibilité 19617 - Périodique Bibliothèque principale Documentaires Disponible On the corrosion effects of reblasted steel / Carl Reed in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 1 (01/2018)
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Titre : On the corrosion effects of reblasted steel Type de document : texte imprimé Auteurs : Carl Reed, Auteur ; Sarah Olthof, Auteur ; Kat Coronado, Auteur ; Heather Cui, Auteur Année de publication : 2018 Article en page(s) : p. 34-44 Note générale : Bibliogr. 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.
Corrosion
Décapage
Essais accélérés (technologie)
Surfaces -- Analyse
Topographie
Traitement de surface par impactIndex. décimale : 667.9 Revêtements et enduits Résumé : It is not uncommon during the course of abrasive-blast surface preparation to overblast and create a blast profile that is over and above the defined specification. This article describes a study that takes a closer look at the topography of a surface (before and after reblasting an over-blasted profile) and determines how this topography might affect the corrosion protection of a coating. Note de contenu : - TABLES : 1. Observed profile characteristics of the four test panel sets - 2. Accelerated corrosion testing results of the coated panel sets
- FIGURES : 1. Orientations of reblasting - 2. Effect of reblasting a profile with a secondary blast cleaning. Original blast profile and same profile after blasting with a smaller steel grit - 3, 4, 5 and 6. Panels 1 to for : Digital optical micrograph and scanning electron micrograph (right) at a magnification of 200 times - 7. Possible orientations of peaks after oblique reblasting. Rolled over peaks from reblast and pushed peaks from reblast - 8. Corrosion and cathodic delamination at the scribes of the panel sets (clockwise from top left : Panel Set 1, Panel Set 2, Panel Set 4 and Panel Set 3.) - 9. Formation of void areas and black iron oxide on a coated substrateEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6236 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30366
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Code-barres Cote Support Localisation Section Disponibilité 19617 - Périodique Bibliothèque principale Documentaires Disponible Thin-film coatings for protecting reinforced concrete bridge elements / Bobby Meade in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 1 (01/2018)
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Titre : Thin-film coatings for protecting reinforced concrete bridge elements Type de document : texte imprimé Auteurs : Bobby Meade, Auteur ; Derrick Castle, Auteur ; Theodore Hopwood, Auteur ; Sudhir Palle, Auteur Année de publication : 2018 Article en page(s) : p. 46-57 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Béton armé
Chlorures
Corrosion
Couches minces
Essais (technologie)
Etanchéité
Matériaux cimentaires -- Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : Steel reinforced concrete bridge components are deteriorating prematurely, especially in marine and snow/ice zones of the U.S. The primary cause of this deterioration is chloride intrusion into the concrete. The authors discuss research that has shown that penetrating sealers can provide some protection to the concrete but are not as effective as thin-film coatings in retarding chloride intrusion. Note de contenu : - Thin-film concrete coatings field testing
- Thin-film coating laboratory testing
- FIGURES : 1. Deteriorated pier cap under a leaking expansion joint - 2. Deteriorated pier column under a leaking expansion joint - 3. Chloride content of KYTC bridge components in 2011 - 4. Pier where thin-film concrete coatings were field tested - 5. Thin-film concrete coating in the field. Spalls are coated but pinholes remain - 6. Coated salt-ponding block with pinholes remaining - 7. Chloride levels for each coating system after salt-ponding test - 8. Coated concrete panels for weathering testing - 9. Color stability of thin-film concrete coatings - 10. Gloss retention of thin-film concrete coatings
- TABLES : 1. Types of thin-film concrete coatings tested - 2. Adhesive strength and failure mode of field-applied coatings - 3. Adhesion of laboratory-applied and weathered coatingsEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6235 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30367
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