What is the difference between Roller-Compacted Concrete (RCC) and Soil-Cement (SC)?
The American Concrete Institute, Subcommittee 207.5 (ACI 207.5R) defines RCC as “Concrete compacted by roller compaction; concrete that in its unhardened state will support a roller while being compacted.” ACI 230.1R defines SC as “a mixture of soil and measured amounts of portland cement and water compacted to a high density.” One can think of RCC as a no-slump concrete that is compacted by a vibratory roller, whereas SC is a highly compacted mixture of portland cement, soil (usually sandy soil), and water. With RCC the cement, non-cohesive fines and water form a paste that coats the coarser aggregates. With soil-cement not all the soil particles are coated with a cement paste. The main difference between RCC and SC for water resources projects is the aggregate or soil used in the mixture and the resulting properties. RCC usually contains controlled dense-graded aggregate with a nominal maximum size aggregate averaging about 1-1/2 in. (38 mm). SC, on the other hand, uses a pit run, no
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