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Service life prediction of concrete bridge decks repaired with bonded concrete overlays

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Abstract

Service life predictions with respect to chloride initiated corrosion of repaired concrete bridge decks are of major concern in order to develop cost-efficient repair strategies. A service life prediction incorporates a service life criterion, a concrete cover and a method to predict the chloride ingress rate. All three topics are discussed and quantified in this paper on old concrete bridge decks repaired by water jetting and bonded steel fibre reinforced concrete overlays. The service lives for two bridge decks are estimated. The parameters used are based on comprehensive field studies of repaired decks that have been in service between five and ten years after the repairs.

The proposed method is capable of taking the distribution of covers and transport coefficients into consideration and any probabilistic level could be used. All calculations can be made by hand and no subjective decisions are needed.

The serice life with respect to chloride initiated corrosion was found to be more than 100 years for the repaired concrete bridge decks. Bonded concrete overlays constitute a durable repair alternative for deteriorated concrete bridge decks.

Résumé

En ce qui concerne la corrosion due aux chlorures, les prédictions de durée de vie en service, après rénovation, des tabliers de ponts en béton sont de première importance pour développer une stratégie de rénovation financièrement efficace. Une telle prévision est constituée d'un critère de durée de vie, d'une couverture en béton et d'une méthode pour prédire le taux de pénétration des chlorures. Ces trois aspects sont discutés et quantifiés dans cet article sur les vieux tabliers de ponts en béton, réparés par un giclage d'eau et une couverture en béton armé avec des fibres d'acier. Ensuite, les durées de vie en service de deux tabliers de ponts sont estimées. Les paramètres utilisés sont determinés à partir d'une étude d'ensemble de tabliers qui ont été en service entre cinq et dix aus après rénovation.

La méthode proposée est capable de prendre en considération la distribution de la couverture et les coefficients de transports; n'importe quel niveau de probabilité peut être utilisé. Cette méthode est facile à employer et à comprendre. Tous les calculs peuvent être faits à la main et aucune décision subjective n'est nécessaire, ce qui rend la méthode indépendante de la personne qui réalise la prédiction de durée de vie.

En ce qui concerne la corrosion due aux chlorures, la durée de vie en service a été estimée à plus de 100 ans pour les tabliers réparés. Fixer une converture de béton constitue une alternative durable pour la rénovation des tabliers de ponts en béton qui sont détériorés.

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Authors and Affiliations

  1. Dept. of Structural Engineering, Royal Institute of Technology, SE-100 44, Stockholm, Sweden

    J. Paulsson-Tralla

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Editorial Note The Royal Institute of Technology is a RILEM Titular Member.

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Paulsson-Tralla, J. Service life prediction of concrete bridge decks repaired with bonded concrete overlays. Mat. Struct. 34, 34–41 (2001). https://doi.org/10.1007/BF02482198

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