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Many old dams are in need of strengthening and rehabilitation as a result of aging, deterioration, deficiencies in design and construction, and more stringent safety standards. These standards include the probable maximum flood and the maximum credible earthquake. Post-tensioned anchors are the most practical and cost-effective method of strengthening existing concrete dams subjected to direct tension, sliding, overturning and seismic loading. In some cases, they are used to stabilize rock abutments and concrete locks and to combat the effects of alkaline and aggregate reaction. The post-tensioning technique requires minimum demolition, has only a minor impact on the dam, and is relatively inexpensive using a small number of anchors. This paper reviews about 60 case histories of concrete dams strengthened by post-tensioned anchors. The reasons for strengthening existing dams are analyzed. The general design, construction, drilling, grouting, testing, and performance of post-tensioned anchors for strengthening concrete dams are outlined. Key words: post-tensioned, anchor, multistrand, fixed anchor length, free anchor length, anchor head, strengthening, rehabilitation, concrete dam.

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