Monksville Dam-A Roller-Compacted Structure

Abstract Only - The concept of roller-compacted concrete is receiving intense world-wide at­tention and is being used for many new dams as well as rehabilitation of old dams, particularly in the western United States. It is an important new technol­ogy offering significant economy which has been little-used to date in the East.
The paper will introduce the concept of RCC and demonstrate its application in a new dam. The advantages of RCC, as well as its limitations, will be presented. Specific topics would include the mix design, fresh and hardened con­crete properties, aggregate production, mixing, hauling and placing methods, and construction quality control.
Monksville Darn is a complex RCC structure incorporating many of the fea­tures typical of a conventional water supply impoundment. Appurtenances in­clude a I IO-foot high free-standing multi-level intake tower, 200-foot wide stepped spillway, a two-lane public highway across the top of the dam, a precast box beam bridge across the spillway, and a precast cantilevered sidewalk. The dam has a maximum height of 157 feet, a length of 2,200 feet and contains 287,000 cy of RCC faced with 17,000 cy of conventional concrete.
Construction of the project began in April 1985 and was completed by August 1987. Reservoir filling began in the Fall of 1987.