What’s Roll Compacted Concrete?

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Roll Compacted Concrete (RCC) is a dry mix of cement, aggregate and water that generates less heat during curing. It can be used for large castings and paving due to its lack of collapse and ability to support weight soon after being poured.

Roll Compacted Concrete (RCC) is a relatively dry mix of cement, aggregate and water. It tends to use different ratios of the same base materials as other concretes, which can make the mix a bit drier. Because roll-compacted concrete can use less water, it can generate less heat during the curing process. This can make it useful in a variety of different applications, especially in very large castings such as those involved in dam construction. The name of rolled or rolled concrete derives from the fact that the mixture is generally compacted with vibrating rollers after casting.

The two main differences between roll-compacted concrete and other varieties are the relative lack of slumps and the overall dryness. Collapse can be measured by compacting the concrete into a conical shape and then examining its behavior. The distance from the original top of the cone to the location where the concrete settles is referred to as the collapse. Some types of concrete collapse completely, while others settle somewhat evenly. Due to mixing ratios and lack of water, rolled concrete tends to hold its shape and settle very little.

Between its lack of collapse and lower heat generation during the curing process, rolled concrete can be suitable for large castings. Excess heat can cause a variety of problems in thick concrete sections, such as cracking. One way this can be addressed is with the next smaller deposit, which can be time consuming and costly. Roll-compacted concrete can also be poured in sections, although it will typically be able to support the weight soon after due to a lack of collapse. This can allow heavy equipment to move to the new pour and set up the next section quickly.

Another use for roll-compacted concrete is paving. There are a variety of ways it can be used for flooring, although a typical method involves a layer of rolled concrete being covered with a layer of asphalt. Because roll-compacted concrete can support weight soon after being poured and generates little heat while it cures, it may be possible to build new roads quickly using this method. In some cases, immediately after the paver passes, vehicles may drive on a concrete and compacted asphalt road. That road can then be opened to traffic within hours of completing the process.

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