Concrete

Concrete

Concrete is one of the most important building-materials. It is difficult to imagine modem structure- without concrete. Concrete is the very building material, which led to great structural innovations. The most important quality of concrete is its property to be formed into large and strong monolithic units of any desired shape.

Concrete is a mixture of cement, sand, gravel and water. It is mixed and poured into forms that hold it in place until it hardens. The crystals forming in the process of making concrete stick together in a very hard artificial stone.

The characteristics of concrete depend upon the quality of the materials used, grading of the aggregates, proportioning and amount of water. The most important requirements for concrete are: it should be hard, strong, durable, fire-resistant and economical.

Concrete can be divided into two classes: plain concrete and reinforced concrete where it is necessary to introduce steel.

Reinforced concrete is a combination of two of the strongest structural materials: concrete and steel. Concrete has an adequate

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