Hyrdo-Quebec`s experience using deep slot cutting to rehabilitate concrete gravity dams affected by alkali-aggregate reaction
Book
·
OSTI ID:192165
- Hydro-Quebec, Dam Safety Service, Montreal, Quebec (Canada)
In recent years, Hydro-Qu{acute e}bec has cut vertical slots in concrete dams to solve structural problems stemming from aging of concrete subject to thermal cycles and alkali-aggregate reaction (AAR). In most cases, the structural disorders caused large cracks and permanent displacement. This paper describes Hydro-Qu{acute e}bec`s experience using a new slot-cutting and sealing technology to rehabilitate concrete gravity dams affected by AAR, among them rehabilitation of the Paugan (1991), La Tuque (1992-1993), Rapides Farmers (1993-1994) and Chelsea (1994) hydroelectric developments. The aim of this technology is to relieve internal stress and to create an effective expansion joint which can accommodate reversible and irreversible displacement induced by thermal cycles as well as permanent movement due to chemical concrete swelling caused by AAR. This method of rehabilitation is generally used in conjunction with grouting and drainage work and sometimes with post-tensioned anchor rods or cables.
- OSTI ID:
- 192165
- Report Number(s):
- CONF-9510182--
- Country of Publication:
- United States
- Language:
- English
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