Bond Strength of Roller Compacted Concreteby Timothy P. Dolen, Bureau of Reclamation, Denver, CO, USA,
Shiraz D. Tayabji, Bureau of Reclamation, Denver, CO, USA,
Abstract: Roller compacted concrete, or RCC, is a dam construction method which consists of placing horizontal layers of no-slump concrete in 1- to 3-ft (0. 3- to 0. 9-m) lifts and compacting the concrete with a smooth-drum, vibratory roller. Because of the frequent horizontal lifts, bond strength of RCC between lifts is a significant concern to the designer. Studies of bond strength were conducted jointly by the Bureau of Reclamation and Portland Cement Association. Bond strength was evaluated by direct tension and direct shear tests. Bonding tests were performed on RCC joint specimens which were cast in the laboratory and from cores obtained from field test sections. Factors studied included mix design proportions, age of the construction joint, curing, surface preparation, and supplemental treatment.
Subject Headings: Concrete dams | Roller-compacted concrete | Bonding | Compaction (material) | Infrastructure construction | Concrete construction | Ultimate strength
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