Volume 24, Issue 2 (December 2002)

    The Damage Rating Index Method for ASR Affected Concrete—A Critical Review of Petrographic Features of Deterioration and Evaluation Criteria

    (Received 19 February 2002; accepted 19 July 2002)

    CODEN: CCAOAD

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    Abstract

    The Damage Rating Index method has recently been used with success in several cases of damage evaluation in structures affected by alkali-silica reaction in Canada and in Brazil. Although this petrographic method is starting to be widely used and is in the process of becoming integrated as a Canadian standard, it has not been modified yet from the original design. An evaluation of the method is presented in this paper. According to data obtained from many petrographic examinations, the number of cracks in coarse aggregates (filled or not with silica gel) seemed to show to best correlation with the expansion measured on laboratory concrete specimens made with Spratt limestone. The reaction rim is not a real “damage” feature and should not be considered as one but as a “degree of reaction” feature. In an attempt to improve the DRI method for assessing damage related to ASR, a new parameter should be introduced, which takes into account cracks running from aggregate particles to cement paste. The geological nature of the rock used as concrete aggregate may influence the reaction mechanism as well as the petrographic features related to ASR. Comparing concrete specimens subjected to ASR, which incorporate different aggregate types may, in some instances, be influenced by the type of reaction produced by the various reactive rocks and minerals in each aggregate.


    Author Information:

    Fournier, B
    Research scientist and manager, International Center for Sustainable Development of Cement and Concrete (ICON) CANMET, Natural Resources Canada, Ottawa, ON

    Ballivy, G
    Research professional and professor, University of Sherbrooke, Sherbrooke, QC

    Rivard, P
    Research professional and professor, University of Sherbrooke, Sherbrooke, QC


    Stock #: CCA10531J

    ISSN: 0149-6123

    DOI: 10.1520/CCA10531J

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    Author
    Title The Damage Rating Index Method for ASR Affected Concrete—A Critical Review of Petrographic Features of Deterioration and Evaluation Criteria
    Symposium , 0000-00-00
    Committee C01