A geochemical method for staining various products of the alkali-silica reaction is presented. The method is based on both the composition of alkali-silica-reaction (ASR) gel and one of its properties (the ability to exchange cations with a fluid). Specifically, one stain (sodium cobalt-initrite) reacts with exchangeable potassium in the gel to form a bright-yellow precipitate on the gel surface. The other class of stains (a variety of rhodamine compounds) reacts with calcium-rich portions of the gel (and, for some compounds, with other calcium-rich components of the concrete) to form a pink-stained gel. The significance of the pink staining is twofold. First, it can provide a high contrast to the yellow-stained gels, making them easier to observe. Second, some rhodamine compounds react predominantly with Ca-rich ASR gels. Some aspects of staining by rhodamine remain the subject of continued study and may be useful for a more detailed understanding of ASR progression and other deterioration mechanisms. However, a positive diagnosis of ASR is indicated by the presence of yellow-stained gel within aggregate, at the aggregate-paste interface, along fractures, or in air voids. The technique can be used as a rapid field screening method or as a useful aid for detailed petrographic examinations.


    Zugriff

    Download

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Geochemical Method for Identifying Alkali-Silica-Reaction Gel


    Weitere Titelangaben:

    Transportation Research Record: Journal of the Transportation Research Board


    Beteiligte:


    Erscheinungsdatum :

    01.01.1999




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Geochemical Method for Identifying Alkali-Silica-Reaction Gel

    Guthrie Jr, George D. | Online Contents | 1999


    Preventing Alkali-Silica Reaction

    Malvar, L. J. / Cline, G. D. / Burke, D. F. et al. | British Library Conference Proceedings | 2003


    Mitigating Alkali–Silica Reaction in Concrete

    Afshinnia, Kaveh / Rangaraju, Prasada Rao | Transportation Research Record | 2019


    Activation Energy of Alkali–Silica Reaction and Dilatometer Method

    Mukhopadhyay, Anal K. / Shon, Chang-Seon / Zollinger, Dan G. | Transportation Research Record | 2006


    Activation Energy of Alkali-Silica Reaction and Dilatometer Method

    Mukhopadhyay, Anal / Shon, Chang-Seon / Zollinger, Dan | Transportation Research Record | 2006