Chemistry: analytical and immunological testing – Geochemical – geological – or geothermal exploration – In situ testing
Patent
1998-04-14
1999-09-21
Snay, Jeffrey
Chemistry: analytical and immunological testing
Geochemical, geological, or geothermal exploration
In situ testing
436 72, 436 79, 436164, G01N 2191
Patent
active
059553723
ABSTRACT:
A method using concentrated aqueous solutions of sodium cobaltinitrite and a rhodamine dye is described which can be used to identify concrete that contains gels formed by the alkali-silica reaction (ASR), and to identify degraded concrete which results in a porous or semi-permeable paste due to carbonation or leaching. 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.
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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).
Natesaiyer, K. et al, "In Situ Identification of ASR Products in Concrete" Cement and Concrete Research, vol. 18, p. 455 (1988).
Helmuth, R. et al "Alkali-Silica Reactivity: An Overview of Research" Strategic Highways Research Program SHRP-C-342, National Research Council, Washington, DC (1993).
Gabriel, A. et al "A Staining Method for the Quantitative Determination of Certain Rock Minerals" Am Mineral. vol. 14, p. 290 (1929).
Bailey, E.H. et al "Selective Staining of K-Feldspars and Plagioclase on Rock Slabs and Thin Sections" Am. Mineral. vol. 45, p. 1020 (1960).
Carey J. William
Guthrie, Jr. George D.
Freund Samuel M.
Snay Jeffrey
The Regents of the University of California
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