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Center Hill Dam, located on the Caney Fork River about 25 miles above its confluence with the Cumberland River in Dekalb County, Tennessee, is the first US Army Corps of Engineers project where alkali-carbonate rock reaction has been identified as a probable cause of cracking in the structure. Expansion of the concrete has opened joints causing excessive leakage between some monoliths, raised the bridge over the spillway, and restricted gate movements. Aggregate in the concrete was produced from a quarry in limestone on the site. Examination of concrete from the structure and of rock samples from the quarry indicated that some of the aggregate used is classified as potentially reactive by the criteria given in Appendix C of the Standard Practice for Concrete (EM 1110-2-2000). Keywords: Expansion; Alkali-aggregate reaction; Alkali-carbonate rock reaction; Concrete dams.
This study was conducted to identify methods that have been used in the repair and rehabilitation of concrete dams. Information was obtained through literary searches, discussions with project personnel, and visits to project sites. Each case history includes a background of the project, the deficiency that necessitated repair or rehabilitation, and descriptions of materials and methods used in the repair or rehabilitation. When available, the cost of the repair project and the performance of the repair to date have been included. Case histories included in this report cover a range of deficiencies in concrete structures, including cracking, spalling, erosion, leakage, inadequate PMF capacity, expansion resulting from alkali-aggregate reaction, instability, and insufficient storage capacity.