Roller compacted concrete (RCC) as used for pavements is a dry portland cement concrete material which is consolidated by external vibration using heavy vibratory rollers or similar equipment. It is normally dryer than a no-slump consistency and must be stiff enough to support the compaction equipment. RCC for pavement construction is generally placed with an asphalt paver or similar equipment, modified to accommodate the stiff consistency of RCC and the thicker lifts used.
RCC for pavements differs significantly from RCC for dams, which is simply a form of low-cement-content mass concrete. The RCC pavement mixes have a much higher cement and paste content and much smaller coarse aggregate. Typical cementitious material contents (cement plus pozzolan) range from 500 to 550 pounds per cubic yard, and the maximum size of coarse aggregate is usually near 3/4 inch.
RCC APPLICATIONS IN CANADA
A full RCC pavement for a log sort yard at Caycuse in the central part of Vancouver Island, British Colombia was built in 1976. This pavement marked the first time RCC was used as a total pavement system in Canada. An easily transportable continuous type mixing plant was set up near the site. The mixing was done in a twin-screw pug mill. The pavement was placed by a conventional self-propelled asphalt paver in two lifts over a 6-inch crushed rock base. The 8-inch bottom lift had an 8-percent cement content, and the 6-inch top lift was made with 12 percent cement. When the pavement was examined three years later, it was found to have performed quite well. There was no evidence whatever of any freeze-thaw deterioration even though, like other RCC pavements, the Caycuse pavement concrete is not air-entrained.