Yes, there appear to be options to stop or control ASR in some dams ! - Ifsttar
Communication Dans Un Congrès Année : 2025

Yes, there appear to be options to stop or control ASR in some dams !

Robin Charlwood
  • Fonction : Auteur
  • PersonId : 1480963
Bruno Godart
  • Fonction : Auteur
  • PersonId : 1417724
Etienne Grimal
  • Fonction : Auteur
  • PersonId : 1480964
Burkan Isgor
  • Fonction : Auteur
  • PersonId : 1480965

Résumé

Many dam owners around the world have been faced with swelling concrete issues at their dams and hydro projects for the past 70 years or more. Several different management strategies have been adopted to allow continued operation, although the options so f ar appear limited and no technologies to stop or limit the reactions have been successfully implemented. In some cases, alkali-silica reactions (ASR) and its associated expansion appear to have diminished after 30 or so years, while in many other cases it continues with more or less vigour. In such cases the potential role of releasable alkalis from aggregates and recycling needs to be considered in order to reliably forecast future behaviour and develop a long-term management plan.

In cases where the ASR continues, given the very long required service life of dams, a hundred years and more, there is a clear need to seek to identify some practical solutions to limit the ASR and its effects in these long-term cases. In such cases the roles of the key ingredients to the reactions, silica, alkalis and water must be clearly understood.

Recent simulations by the authors have shown that, given the increasingly long required service lives of dams, and often the slow rate of expansion, some very long-term solutions, such as draining and drying the concrete to reduce the expansion rates in some parts of dams and associated structures, may be possible and worth considering in some cases. This paper reviews the issues involved in such notions and suggests some scenarios and technical solutions where very long-term sealing, draining and drying may be effective in existing dams with continuing ASR. In addition, we note that in some extreme cases of new dams or rehabilitation of existing dams where there is persistent uncertainty in performance testing of mix designs for ASR prevention, consideration could be given to applying such techniques immediately as a backup in case ASR occurs despite the testing.

We suggest some practical options to achieve these objectives and identify issues that would need to be addressed to confirm their feasibility and practicability.

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Dates et versions

hal-04847371 , version 1 (19-12-2024)

Identifiants

  • HAL Id : hal-04847371 , version 1

Citer

Robin Charlwood, Bruno Godart, Etienne Grimal, Burkan Isgor. Yes, there appear to be options to stop or control ASR in some dams !. 5th international Dam World Conference, Apr 2025, Lisbonne, Portugal. pp.21. ⟨hal-04847371⟩
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