The concrete will become hard in a matter of hours, but takes a month to reach its full strength. Once the steel is in place, one can start to prepare the concrete, by mixing cement, sand, stone chips in a range of sizes, and water in a cement mixer, and pouring in the liquid concrete into the formwork tilll exactly the right level is reached. The tied steel is called a reinforcement cage, because it is shaped like one. Then one looks at the structural engineer's drawings and places in the steel reinforcement bars, and ties them in place using wire. To make reinforced concrete, one first makes a mould, called formwork, that will contain the liquid concrete and give it the form and shape we need. This combination works very well, as concrete is very strong in compression, easy to produce at site, and inexpensive, and steel is very very strong in tension. RCC is concrete that contains steel bars, called reinforcement bars, or rebars. Its full name is reinforced cement concrete, or RCC. When we say concrete in the building trade, we actually mean reinforced concrete.
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