[File:UserKTrimble-AP Taum Sauk Reservoir UnderConstruction Nov 22 2009 crop1.jpg|thumb|right|The rebuilt upper reservoir of the
Taum Sauk plant, nearing completion in this photo, is the largest RCC dam in North America.]]
Roller-compacted concrete (
RCC) or
rolled concrete is a special blend of
concrete that has essentially the same ingredients as conventional concrete but in different ratios, and increasingly with partial substitution of
fly ash for
Portland cement. RCC is a mix of cement/fly ash, water, sand,
aggregate and common additives, but contains much less water. The produced mix is drier and essentially has no
slump. RCC is placed in a manner similar to
paving; the material is delivered by
dump trucks or
conveyors, spread by small
bulldozers or specially modified
asphalt pavers, and then compacted by
vibratory rollers.