Definition of material - concrete

What is concrete? (stone)

Construction material formed by cement and other materials, such as crushed stones (granite and others), sand and water. It solidifies and its hardness is due a chemical process named 'hydration'. This process gives to concrete a lot of resistance to compression efforts. It is commonly used in construction, pavements, civil engineering and other architectural structures. Sometimes concrete is mixed with steel sticks and used as a complex to optimize structure in traction and bending efforts.

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Cities with constructions using concrete as one of principal materials