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Detection of alkali-silica reaction swelling in concrete by staining

United States Patent

*** EXPIRED ***
April 14, 1998
View the Complete Patent at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
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.
Guthrie, Jr.; George D. (Santa Fe, NM), Carey; J. William (Santa Fe, NM)
The Regents of the University of California (Los Alamos, NM)
08/ 745,118
November 7, 1996
The invention was made with government support under Contract No. W-7405-ENG-36 awarded by the U.S. Department of Energy to the Regents of The University of California. The government has certain rights in the invention.