SUITABILITY OF TWO RAPID TEST METHODS FOR DETERMINING THE ALKALI REACTIVITY OF SANDS

Five sands have been used in a study aimed at determining their reactivity potential using a number of test methods. The sands were used either in mortar bars or in concrete prisms containing non- reactive coarse aggregate, at various alkali levels, and subjected to accelerated test procedures. Expansion of mortar bars stored in 1 m NaOH solution at 80 degrees C indicated the sands to be potentially reactive, whereas those made at 2.5 or 3.5% cement alkali levels and subjected to autoclaving for 4 or 5 h at 127 degrees C did not produce deleterious expansions, except in the case of one sand. Micro- structural studies have indicated that the mechanisms operating in the two methods could be different. Although some of the sands had petrographic features that could indicate potential reactivity, unfortunately, no controlled long-term experimental or field data are available related to the service performance of the sands in concrete structures. Further investigation is required to establish or verify the suitability of the rapid test methods for determining the reactivity of sands with more confidence. (A)

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  • Corporate Authors:

    Elsevier

    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • Shayan, A
    • IVANUSEC, I
    • DIGGINS, R
  • Publication Date: 1994

Language

  • English

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Filing Info

  • Accession Number: 00670098
  • Record Type: Publication
  • Source Agency: TRL
  • Files: ITRD
  • Created Date: Dec 23 1994 12:00AM