Current Corps of Engineers Concepts for Roller Compacted Concrete in Dams

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by Dennis R. Hopman, Corps of Engineers, Concrete Control, Section, Portland, OR,
Oswin Keifer, Jr., Corps of Engineers, Concrete Control, Section, Portland, OR,
Fred Anderson, Corps of Engineers, Concrete Control, Section, Portland, OR,

Document Type: Proceeding Paper

Part of: Roller Compacted Concrete:

Abstract: Since construction of Willow Creek Dam in 1982, Elk Creek Dam in southwest Oregon is the only Corps of Engineers dam to be constructed using RCC that has passed beyond the planning stage to engineering and design. Design and construction concepts for Elk Creek Dam are considered to constitute the current Corps of Engineers criteria for RCC for dams. Because of the size and purpose of the structure, design concepts were established to assure a low rate of seepage through the dam, particularly at the lift joints, to provide a smooth and durable exposed surface for the full height of the upstream face and spillway, and to increase the rate of placement of the roller compacted concrete. Procedures to improve watertightness, each to act independently and with each other to prevent seepage, include construction of a three-foot-wide conventional concrete upstream face, extensive lift joint treatment to eliminate voids and improve bond, and rapid placement of RCC at low temperatures to reduce the amount of cracking due to thermal contraction.

Subject Headings: Concrete dams | Roller-compacted concrete | Compaction (material) | Rivers and streams | Infrastructure construction | Seepage | Conceptual design | Concrete structures | Oregon

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