Roller Compacted Concrete (RCC) is a type of concrete that has been used since the early 1980s. It is made by combining cement, coarse aggregates, water and other admixtures to form a strong and durable material. RCC is typically placed with a paver or spreader-finisher machine and then compacted with vibratory rollers. This method produces an extremely dense material with low permeability that can withstand heavy loading.
RCC offers several advantages over traditional concrete mixtures, including cost savings in terms of materials, labor and equipment costs. Additionally, its increased strength makes it suitable for larger projects such as roads and dams where high durability is required. It also sets quickly allowing for faster construction times compared to traditional methods such as poured concrete.
Mix Design Of Roller Compacted Concrete
The mix design of Roller Compacted Concrete is a process whereby the proportions of the various ingredients in the concrete mix are proportioned and mixed so as to produce a product that meets the specified engineering requirements. The main ingredients in Roller Compacted Concrete are cement, aggregate, water, and admixtures. The first step in the mix design process is to determine the desired properties of the finished product. The next step is to select the appropriate materials and proportions that will produce the desired results.
The mix ratio is calculated based on the maximum aggregate size, the workability of the concrete, and the compressive strength desired. The water-cement ratio is also taken into account, as this will affect the strength and workability of the concrete.
It is important to use less water in roller compacted concrete because it increases the strength of the concrete and decreases the amount of shrinkage that occurs when the concrete dries. Additionally, using less water also makes the concrete more resistant to freeze-thaw cycles.
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