Detection of alkali-silica reaction swelling in concrete by stai

Chemistry: analytical and immunological testing – Geochemical – geological – or geothermal exploration – In situ testing

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436 72, 436 79, 436164, G01N 2191

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active

057390355

ABSTRACT:
A method using concentrated aqueous solutions of sodium cobaltinitrite and rhodamine B is described which can be used to identify concrete that contains gels formed by the alkali-silica reaction (ASR). These solutions present little health or environmental risk, are readily applied, and rapidly discriminate between two chemically distinct gels; K-rich, Na--K--Ca--Si gels are identified by yellow staining, and alkali-poor, Ca--Si gels are identified by pink staining.

REFERENCES:
patent: 5656075 (1997-08-01), Gaidis et al.
French, W.J. et al "Alkali-aggregate Reactions and the Middle East" Concrete, vol. 10, No. 1, pp. 18-20 (Jan. 1976).
Poole, A.B. et al "A Staining Technique for the Identification of Sulphates in Aggregates and Concretes" Mineralogical Magazine, vol. 40, pp. 315-316 (1975).
Natesaiyer, K.C. et al "Further Study of An In-Situ Identification Method for Alkali-Silica Reaction Products in Concrete" Cement and Concrete Research, vol. 19, pp. 770-778 (1989).
K. Natesaiyer et al., "In Situ Identification of ASR Products In Concrete," Cement and Concrete Research 18, 455 (1988).
Richard Helmuth et al., "Alkali-Silica Reactivity: An Overview of Research," Strategic Highways Research Program SHRP-C-342, National Research Council, Washington, DC (1993).
A. Gabriel et al., "A Staining Method For the Quantitative Determination Of Certain Rock Minerals," Am. Mineral. 14, 290 (1929).
Edgar H. Bailey et al., "Selective Staining of K-Feldspars And Plagioclase On Rock Slabs And Thin Sections," Am. Mineral. 45, 1020 (1960).

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