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- Title
Failure Mechanisms and Rehabilitation Scenarios for Concrete Hydroelectric Facilities Affected by Alkali–Aggregate Reaction.
- Authors
Ftima, Mahdi Ben; Yildiz, Emre
- Abstract
This work focuses on the failure mechanisms of concrete hydroelectric facilities affected by alkali–aggregate reaction (AAR). Identification of potential failure mechanisms is based on an original "top-down approach" using an AAR pushover analysis with multi-physics numerical simulation of a representative hydroelectric facility. Different global rehabilitation scenarios based on slot-cutting and grouting techniques are discussed and compared, using different performance metrics. A new quantitative performance metric, specifically developed for the nonlinear sophisticated analysis tool and considering the volumetric cracking caused by AAR is also suggested. Based on comparison results, a combination of grouting after a partial slot-cutting in the neighborhood of the discontinuities, appears to provide the best compromise in terms of stress relief and extent of cracking. New AAR benchmark problems, issued from the top-down approach, are also suggested for the first time in the literature.
- Subjects
HYDROELECTRIC power plants; ALKALI-aggregate reactions; CONCRETE fatigue; NUMERICAL analysis; NONLINEAR analysis; NEIGHBORHOODS; BENCHMARK problems (Computer science)
- Publication
International Journal of Concrete Structures & Materials, 2023, Vol 17, Issue 1, p1
- ISSN
1976-0485
- Publication type
Article
- DOI
10.1186/s40069-023-00590-8