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Erschienen in:
2024 | OriginalPaper | Buchkapitel
AAR Effects at Fontana Dam Spillway
verfasst von : Dan D. Curtis, Gurinderbir Sooch, Michael A. Morrison, Jim Rossillon
Erschienen in: Proceedings of the 17th International Conference on Alkali-Aggregate Reaction in Concrete
Verlag: Springer Nature Switzerland
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Abstract
Fontana Dam is TVA’s largest concrete dam and the largest dam east of the Mississippi river in the United States. The dam is a multipurpose project that provides hydropower, flood control, recreational, and water supply benefits. Most discharges from the dam pass through the powerhouse. The dam also has a low-level outlet and a gated spillway which serves as the primary lake level control during floods.
The dam was constructed during the Second World War and has a history with Alkali Aggregate Reactivity (AAR) concrete issues that date back to the early 70s. Until recently, AAR issues had been manifested at the spillway by gate binding issues that precipitated slot cuts and annual full travel inspections of the gates.
During a routine full travel inspection in late 2017, a crack was observed on an exposed steel trunnion assembly that supports the spillway gates. Immediately repairs were made to the trunnion assembly to restore it to original design condition.
This paper will describe the investigations into the cause of the cracking, and an update on the current condition and monitoring program. An analysis of AAR effects on the gate anchorage is also presented. As this trunnion assembly and gate anchorage design is similar to that used at numerous other concrete dams, the results of this study might be instructive to other dam owners who may have concrete affected by AAR.