No-Slump Roller-Compacted Concrete (RCC) for Use in Mass Concrete Construction.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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The use of no-slump, roller-compacted concrete RCC in mass concrete construction was investigated. RCC is concrete having no slump but containing the minimum amount of water necessary to achieve consolidation with a vibrating roller. Tests were conducted to a optimize mixtures for application of no-slump techniques, b develop a consistency and quality control technique, c determine methods of improving hardened lifts joints, d determine the relative frost resistance of RCC, e evaluate the erosion susceptibility, and f discover economical methods of obtaining void-free vertical surfaces. Indications are that a the curb concrete is viable method of forming and containing RCC b the degree of compaction achieved is dependent on the stiffness and the paste content of the mixture, the lift thickness, and the individual roller c the tensile strength of the untreated joints increased with paste content and quality from approximately 25 percent for relatively lean RCC to approximately 50 percent for richer RCC d erosion resistance at 35-ftsec fluid velocity of RCC is good e resistance to freezing and thawing of the RCC is poor, apparently due to a poor air void system and f surface treatment with a mortar gun shotcrete appears to be a practical method to achieve smooth vertical surfaces.
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