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AgNO3 spray tests: advantages, weaknesses, and various applications to quantify chloride ingress into concrete. Part 2: Non-steady-state migration tests and chloride diffusion coefficients

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Abstract

This paper forms the second part of a series devoted to the analysis of the capabilities of AgNO3 spray tests, in view of using them for various issues, within the framework of the evaluation and the prediction of chloride-induced corrosion risks. More precisely, the Maultzsch procedure (spraying of 0.1-N AgNO3 solution + K2CrO4) and the use of AgNO3 alone have been investigated on a broad range of concretes. In this second part, the feasibility of colorimetric techniques on saturated specimens cast in laboratory, after non-steady-state migration tests carried out in various conditions is discussed. Colorimetric methods have been applied to the determination of the average penetration depth. In addition, the detection threshold of these techniques has been investigated. Moreover, colorimetric methods have been applied to the calculation of apparent and effective chloride diffusion coefficients from non-steady-state diffusion and migration tests. The results then obtained have been compared to the values obtained by other types of methods.

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Acknowledgments

The computations by means of a numerical multi-species model have been carried out by Nguyen Thai Quang (LCPC, Paris).

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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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  4. Dominique Henry
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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 2: Non-steady-state migration tests and chloride diffusion coefficients. Mater Struct 40, 783–799 (2007). https://doi.org/10.1617/s11527-007-9236-y

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