Title:
Investigation and Repair of Hoist
Dam
Author(s):
Gary R. Mass and John G. Meier
Publication:
Concrete International
Volume:
2
Issue:
9
Appears on pages(s):
49-56
Keywords:
concrete cores; concrete durability;
deterioration; maintenance; patching; petrography;
preplaced aggregate concrete; repairs; safety , samples; surveys; tests; weathering.
DOI:
Date:
9/1/1980
Abstract:
An investigation was made of the concrete in a 54-year-old gravity arch dam. Visual examination of the structure showed severe concrete weathering and erosion. Depth of deterioration and condition of interior concrete was studied by core drilling. Petrographic examinations and laboratory tests were made on core specimens. Additional information was obtained from a repair program underway by the owner. The study showed that complete restoration would require an average of 1.2 ft (0.4 m) of concrete replacement on the upstream face and 2.3 (0.7 m) of concrete replacement on the downstream face. Replacement was made by the preplaced aggregate concrete method. The interior concrete was not of first quality but when protected from exposure by a high quality concrete exterior further deterioration would be minimized and the structure would be capable of many years of continued service. [Authors]