Alkali Reactivity of Strained Quartz as a Constituent of Concrete Aggregate

    Volume 5, Issue 2 (January 1983)

    ISSN: 0149-6123

    CODEN: CCAOAD

    Page Count: 3


    Buck, AD
    Geologist, Corps of Engineers, Vicksburg, MS

    Abstract

    Some strained quartz may cause a deleterious alkali-silica reaction if present as a constituent of concrete aggregate in sufficient amounts. The criterion for reactive strained quartz is suggested to be more than 20% strained quartz with an average undulatory extinction angle greater than 15°. Length changes of mortar bars containing such strained quartz will be 0.025 and 0.040% or more at six and twelve months, respectively, when stored at a temperature of 60°C (140°F). Revisions to applicable ASTM standards may be appropriate.


    Paper ID: CCA10264J

    DOI: 10.1520/CCA10264J

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    Author
    Title Alkali Reactivity of Strained Quartz as a Constituent of Concrete Aggregate
    Symposium , 0000-00-00
    Committee C09