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AgNO3 spray tests: advantages, weaknesses, and various applications to quantify chloride ingress into concrete. Part 1: Non-steady-state diffusion tests and exposure to natural conditions

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Abstract

Within the framework of the evaluation and the prediction of chloride-induced corrosion risks, simple and rapid AgNO3 spray tests can be proposed for various issues. This paper forms the first part of a series. In this first part, the Maultzsch procedure (spraying of 0.1-N AgNO3 solution + K2CrO4) as well as the procedure based on the use of a sole AgNO3 solution have been investigated on a broad range of concretes. These procedures have also been compared to the Collepardi procedure (spraying of 0.1-N AgNO3 + fluoresceine). The feasibility of these colorimetric techniques on saturated specimens cast in laboratory, after non-steady-state diffusion tests carried out in various conditions, is discussed. In addition, the results obtained from applying such spray tests in field conditions on cores drilled out from various RC test specimens exposed to a marine environment (tidal zone) and to a road and cold environment (freezing-thawing cycles and spraying of deicing salts) are presented. Colorimetric methods have in particular been applied here to the assessment of the average chloride penetration depth and of its evolution versus time (kinetics). Moreover, the detection threshold of these techniques has been investigated in various environments. The possible sources of discrepancy on the results have been analysed.

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Authors and Affiliations

  1. LCPC (Laboratoire Central des Ponts et Chaussées – Research Laboratory of Bridges and Roads Administration), Paris, France

    Véronique Baroghel-Bouny, Patrick Belin & Dominique Henry

  2. BAM (Federal Institute for Materials Research and Testing), Berlin, Germany

    Matthias Maultzsch

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  1. Véronique Baroghel-Bouny
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  2. Patrick Belin
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  3. Matthias Maultzsch
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Correspondence to Véronique Baroghel-Bouny.

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Baroghel-Bouny, V., Belin, P., Maultzsch, M. et al. AgNO3 spray tests: advantages, weaknesses, and various applications to quantify chloride ingress into concrete. Part 1: Non-steady-state diffusion tests and exposure to natural conditions. Mater Struct 40, 759–781 (2007). https://doi.org/10.1617/s11527-007-9233-1

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