Evaluation of corrosion resistance of steel dowels used for concrete pavements

Par Conseil national de recherches du Canada

DOI	Trouver le DOI : https://doi.org/10.1061/(ASCE)0899-1561(2008)20:10(650)
Auteur	Rechercher : Mancio, M.; Rechercher : Carlos, C.; Rechercher : Zhang, J. Y.¹; Rechercher : Harvey, J. T.; Rechercher : Monteiro, J. M.; Rechercher : Ali, A.
Affiliation	Conseil national de recherches du Canada. Institut de recherche en construction du CNRC
Format	Texte, Article
Sujet	concrete pavements; durability; steel; corrosion; dowels; Chaussées
Résumé	In concrete pavements, steel dowels are exposed to a particularly aggressive environment that leads to depassivation and greatly reduces the corrosion initiation stage. Aggressive agents such as chlorides and CO2 have easy access to the dowels through pavement joints and, consequently, the corrosion performance of the system depends largely on the properties of the steel dowel being used. This study investigates the corrosion performance of several types of steel dowels embedded in concrete and subjected to accelerated corrosion by exposure to 3.5% NaCl solution for 18 months. Seven types of dowels were tested: bare carbon steel, stainless steel clad, grout-filled hollow stainless steel, microcomposite steel, carbon steel coated with bendable epoxy, and carbon steel coated with nonbendable epoxies. Half-cell potential, polarization resistance, visual inspections, and microscopic investigations by scanning electron microscopy were carried out to evaluate their corrosion performance. Results show that microcomposite steel dowels exhibit greater resistance to corrosion propagation than carbon steel dowels, but lesser than stainless clad and stainless hollow bars. In epoxy-coated bars, corrosion occurred at a few localized defective areas, generally at holidays and edges of bar ends. No significant difference was observed between nonbendable and bendable epoxy-coated dowels.
Date de publication	2008-10-01
Maison d’édition	American Society of Civil Engineers
Dans	Journal of Materials in Civil Engineering 20, nº 10 (1 octobre 2008) : 650–658.
Langue	anglais
Publications évaluées par des pairs	Oui
Numéro du CNRC	NRCC 51148 NRC-IRC-20037
Numéro NPARC	20329001
Exporter la notice	Exporter en format RIS
Signaler une correction	Signaler une correction (s'ouvre dans un nouvel onglet)
Identificateur de l’enregistrement	d5b296fa-66d2-484a-872f-21279b8ad98b
Enregistrement créé	2012-07-18
Enregistrement modifié	2021-10-05

Date de modification :: 2024-04-19