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Materials and Structures
Article . 2001 . Peer-reviewed
License: Springer TDM
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Round-Robin test on chloride analysis in concrete—Part I: Analysis of total chloride content

Authors: Castellote, Marta; Andrade Perdrix, Carmen;

Round-Robin test on chloride analysis in concrete—Part I: Analysis of total chloride content

Abstract

[FR] Cet article donne une partie des résultats d'un essai interlaboratoire réalisé lors de l'analyse du chlorure dans les bétons. Cet essai interlaboratoire a éte effectué par la Commission Technique TC 178-TMC. Dans cet essai, ont été testées, l'analyse totale des chlorures, des chlorures libres, ainsi que la détermination colorimétrique du front des chlorures dans le béton. Cet article rapporte les résultats qui correspondent au contenu total des chlorures. Les chlorures solubles dans l'eau et le front de colorimétrie sont reportés dans les seconde et troisième parties de ce papier. Dans le monde entier, une trentaine de laboratoires ont participé à cet essai interlaboratoire, et 64 analyses différentes surdes échantillons en triple exemplaire ont été effectuées. Le processus pour l'analyse totale des chlorures a été divisé en deux étapes: extraction et analyse, détaillant pour chacune d'elles, la fiabilité des processus employés. Deux méthodes différentes d'extraction des chlorures totaux à partir des solides (A1 et A2) ont été testées, aussi bien que six formes différentes d'analyse des liquides (C1 à C6). Les laboratoires étaient libres de choisir d'utiliser “d'autres méthodes” (A3 et C7, respectivement, pour l'extraction et l'analyse). (La recette complète de ces méthodes est reportée dans l'annexe 1). Pour la détermination de la fiabilité des méthodes de test, le traitement statistique des données a été réalisé en accord avec la norme internationale ISO 5725-1981 (F): “Détermination de la répétabilité et de la reproductibilité par essais interlaboratoires”. Comme résultats finaux, les méthodes recommandées pour l'extraction et l'analyse du total des chlorures, sont les suivantes: C1-C1, A2-C4*, A2-C7, A3-C4* et A3-C7.

[EN] The present paper gives part of the results of a Round Robin Test on chloride analysis in concrete, carried out by the Technical Committee TC 178-TMC. In this RRT, the analysis of total chloride, free chloride and the colourimetric determination of the front of chlorides in concrete have been tested. This paper reports the results corresponding to total chloride content. Water soluble chloride and colourimetric front are reported respectively in Parts II and III of the paper. A total of 30 laboratories around the world have participated in this RRT, and a total determination of 64 different analyses on triplicate specimens have been carried out. The procedure for the analysis of total chloride has been divided into two steps: extraction and analysis, discriminating the reliability of the procedure followed in each of them. Two different methods of extraction of total chloride from the solid sample (A1 and A2) as well as six different forms of analysing the resulting liquids (C1 to C6) have been tested. It was also decided that other methods could also be used to the choice of each laboratory, as "other methods" (A3 and C7 for extraction and analysis respectively). (The complete recipes of these methods can be found in Annex 1 of the paper.) The statistical treatment of the data has been carried out according to the International Standard ISO 5725-1981 (F) for the determination of the reliability of testing methods: "Determination of the repeatability and reproducibility by Round Robin tests". As a final result the methods of extraction and analysis recommended for total chlorides have been the following: C1-C1, A2-C4*, A2-C7, A3-C4* and A3-C7.

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Spain
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Keywords

Chloride ingress, Chloride Content, Free Chloride, Total Chloride, Round Robin Test, Chloride, Analysis

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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