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Aggregates are the stone chips used in concrete. A standard mix may also specify the maximum aggregate size. Therefore M30 concrete will have a compressive strength of 30 n/mm2. Common examples of standard mixes are M20, M30, M40 concrete, where the number refers to the strength of the concrete in n/mm2 or newtons per square millimeter. For most construction applications, however, a standard mix is used. This will allow the liquid concrete to flow by gravity into every corner of the formwork. For example, if he is casting a thin concrete wall in a hard-to-reach area, he will ask for a mix that is more flowable than stiff. A site engineer will often order a different type of mix for a different purpose.
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A good mix designer will start with the properties that are desired in the mix, then take many factors into account, and work out a detailed mix design. Working out the exact 'recipe', or proportions of each ingredient is a science in itself. During this time the concrete must be cured, or supplied with water on its surface, which it needs for the chemical reactions within to proceed properly. Therefore it is usually propped up until that period.
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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.