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Infrastructures, Volume 4, Issue 3 (September 2019)
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Cover Story (view full-size image) The alkali–silica reaction is a chemical phenomenon that, inducing expansion and cracks formation [...] Read more. The alkali–silica reaction is a chemical phenomenon that, inducing expansion and cracks formation in concrete, can have a severe impact on the safety and functioning of existing concrete dams. Starting from a phenomenological two-phase isotropic damage model, describing the degradation of concrete, the effects of alkali–silica reaction in an existing concrete gravity dam were evaluated. Considering the real temperature and humidity variations, the influence of both temperature and humidity was considered through two uncoupled diffusion analyses. The numerical analyses, performed with the two-phase damage model, allowed predicting the structural behavior both in terms of damage pattern and increase of crest displacements. Reasonably good agreement with the real monitoring data was obtained. View this paper.