Roller-compacted concrete (RCC) is just what it sounds like. This stiff, zero-slump concrete mixture can be placed with asphalt-type paving equipment and then compacted with rollers.
Even though RCC has the same basic ingredients as conventional concrete—cement, fine and coarse aggregates, and water—it is drier, and looks and feels like damp gravel. A low water-cement ratio and dense-graded aggregates give RCC high strength, making it ideal for paving inter-modal facilities, equipment yards, and trucking terminals. It has also been used for parking lots, city streets, and intersections.
This concrete costs less because it is easy and fast to produce and place. Resulting pavements do not require joints, dowels, reinforcing steel, formwork, or finishing, and are virtually maintenance-free.
Properties Of An RCC Mix
Special attention to mixing and batching procedures must be considered with concrete that's to be compacted by rollers. Compared with conventional concrete, RCC pavement mixes have:
A lower water content
- A lower paste content
- No air-entrainment, although some admixtures may be used to increase workability and control set time.
- More finer aggregates
- Smaller maximum size coarse aggregate.