Journal Published Online: 01 December 2002
Volume 24, Issue 2

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

CODEN: CCAGDP

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

Rivard, P
University of Sherbrooke, Sherbrooke, QC, Canada
Fournier, B
International Center for Sustainable Development of Cement and Concrete (ICON) CANMET, Natural Resources Canada, Ottawa, ON, Canada
Ballivy, G
University of Sherbrooke, Sherbrooke, QC, Canada
Pages: 11
Price: $25.00
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Stock #: CCA10531J
ISSN: 0149-6123
DOI: 10.1520/CCA10531J