Issue |
MATEC Web Conf.
Volume 364, 2022
International Conference on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR 2022)
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Article Number | 03011 | |
Number of page(s) | 6 | |
Section | Condition Assessment of Concrete Structures - Materials and Structural Assessment | |
DOI | https://doi.org/10.1051/matecconf/202236403011 | |
Published online | 30 September 2022 |
Microscopic assessment of ASR-affected columns after 20 years in service
University of Ottawa, Ottawa, Canada
* Corresponding author: azahe049@uottawa.ca
Deterioration signs were observed on the concrete surface of the exterior columns of the SITE building located at the University of Ottawa, Ottawa (Ontario, Canada) which demonstrated the potential presence of a concrete damage mechanism, suspected to be alkali-silica reaction (ASR). To investigate the root cause of this deterioration, a visual inspection was conducted to select concrete members for coring. Damage development in the extracted cores was then evaluated through various microscopic techniques to identify the cause and extent of deterioration. First, the petrographic examination was carried out with the aim of detecting the cause of damage in the extracted core specimens through the analysis of damage features; confirming the presence of ASR in the selected elements Afterwards, the Damage Rating Index (DRI), a semi-quantitative microscopic procedure, was used to evaluate the extent of the damage. Data collected during the visual inspection and petrographic examination will be presented and analyzed. Moreover, based upon the analysis of DRI results, the induced expansion levels in affected columns will be discussed, along with potential implications on their structural performance.
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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