Polymer Impregnation Repairs of Cavitation/Erosion Damage at Dworshak Dam

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Title: Polymer Impregnation Repairs of Cavitation/Erosion Damage at Dworshak Dam

Author(s): E. K. Schrader and S. B. Tatro

Publication: Special Publication

Volume: 214

Issue:

Appears on pages(s): 73-94

Keywords: cavitation; concrete; dams; dry pack; fiber reinforced concrete; outlets; polymer; polymer impregnation; repairs; stilling basin

Date: 6/17/2003

Abstract:
This paper discusses polymer impregnation in the repairs of concrete damaged by cavitation/erosion at Dworshak dam. Impregnation was performed on conventional concrete, fibrous concrete, and dry-pack patches. The repairs included vertical and horizontal surfaces. Testing which demonstrated the improved resistance of polymer impregnated concrete to cavitation and erosion damage are summarized. With approximately 25 years of experience, the repairs have performed extremely well, although it should be noted that modifications were made about 8 years after the polymer repairs to minimize cavitation in the outlets by aeration. To date, this is the most complex known polymer impregnation project performed under a construction contract.