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Erschienen in:
2024 | OriginalPaper | Buchkapitel
Variability in the Assessment of Damage in Concrete Due to Alkali-Silica Reaction Through the Use of the Damage Rating Index Method
verfasst von : Mathieu Champagne, Anthony Allard, Benoit Fournier, Benoit Bissonnette, Carl Duchesne
Erschienen in: Proceedings of the 17th International Conference on Alkali-Aggregate Reaction in Concrete
Verlag: Springer Nature Switzerland
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Abstract
This paper presents a new methodology to analyze data provided with the Damage Rating Index (DRI) method on field structures, which is a popular engineering tool for the assessment of concrete damage in North America. In an effort to optimize the analytical time with respect to a selected margin of error, the inherent variability of the DRI method between cores extracted in a “restricted” area (± 1 m2) was investigated. Four to six cores were assessed in seven ASR-affected component locations and thorough statistical analysis was performed. This analysis was applied down to the maximum depth available.
A notable variability between cores extracted in a “restricted” area was assessed, but it significantly varied between the seven investigated locations. For instance, the average 90% confidence prediction range between cores was equal to 263 when considering their whole area. A conservative correction factor is suggested based on statistical analysis from the obtained data. This correction factor implies that assessing squares from more than one core approximately doubles the precision of the obtained DRI number. Further implications on the uncertainty of the DRI number are discussed. An optimized approach to assess the precision level of the obtained DRI number is provided.