Roller-compacted concrete

RCC ( Roller Compacted Concrete also briefly RCC ) is an earth-moist concrete, which is installed with flat or driving excavators and compacted using rollers. It is used in the production of road surfaces in road construction, construction of RCC dams in hydraulic and structural floor as in industrial or warehouse floors. Development began in the 1980s in the United States. RCC was first used in 1986 in Germany.

RCC has a lower cement content than conventional concrete (80 - 150 kg / m³). Accordingly, one can distinguish between low cementitious RCC with a cement content of 99 kg / m³ or less and high cementitious RCC with a cement content of 150 kg / m³. To keep the heat of hydration after setting as low as possible, the RCC pozzolans are added.

In road construction, a distinction is made between rolling concrete layers and rolled concrete wearing courses:

• RCC courses are often built over with an asphalt layer,
• Rolled concrete wearing courses are not overbuilt ( top layer ( also ceiling or pavement ) = upper part of the road superstructure )

The RCC is fitted with a paver or with a laser-controlled grader blade that is attached to a wheel loader, a layer of about 18-20 cm (depending on the load requirement of up to 25 cm) thick, pre-compressed and then using a roller with a smooth bandage or with one wheel roller compacted. In dams, layer thicknesses of about 30 cm usual.

In the United States there is a widespread construction. In Germany, this construction could not prevail in the road, as the quality of the concrete floor is sufficient only modest requirements ..

Owing to the sometimes rough surface quality, it is necessary to provide the roll for use as an industrial concrete floor with an additional cover layer. This can happen, for example, with a layer of about 2 cm plastic- industrial screed. This can alternatively be coated with epoxy resin, but also ground and entered later.