CONCEPT OF REINFORCED CEMENT CONCRETE (RCC) AND ITS GRADING
Reinforced Cement Concrete (RCC) is a composite material made up of cement, coarse aggregates, fine aggregates, water, and reinforcement. The combination of cement and water forms a paste that coats the surface of the aggregates and binds them together to form a solid mass. Reinforcement, typically in the form of steel bars or mesh, is added to provide tensile strength to the concrete, which is otherwise weak in tension.
The grades of RCC refer to the strength of the concrete, which is determined by the ratio of cement, water, and aggregates used in the mix. The strength is usually specified in terms of compressive strength, which is the maximum load the concrete can withstand before it fails under compression. The most commonly used grades of RCC are:
- M20 grade: This grade of RCC has a compressive strength of 20 MPa (megapascals) or 2900 psi (pounds per square inch). It is used for light to medium-duty structures like residential buildings, low-rise buildings, and small bridges.
- M25 grade: This grade of RCC has a compressive strength of 25 MPa or 3625 psi. It is used for medium-duty structures like multi-story buildings, bridges, and heavy-duty industrial floors.
- M30 grade: This grade of RCC has a compressive strength of 30 MPa or 4350 psi. It is used for heavy-duty structures like high-rise buildings, bridges, and dams.
- M35 grade: This grade of RCC has a compressive strength of 35 MPa or 5075 psi. It is used for structures that require very high strength, like heavy-duty industrial floors, blast-resistant structures, and underground structures.
The choice of grade for a particular structure depends on several factors, including the load-bearing capacity required, the environmental conditions, and the intended lifespan of the structure. The mix design for RCC is usually done by a qualified engineer or concrete technologist, who takes into account all these factors to arrive at the most suitable mix for the particular application.
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