Standardized Result Dorf, Richard. Engineering Handbook . CRC Press, 1996. 3 Concrete is an artificial material similar to stone that is used for many different structural purposes. It is made by mixing several different coarse aggregates such as sand and pebbles with water and cement and then allowing it to harden by hydration.
Hydration causes crystals to form that interlock and bind together.
According to the Brooklyn Public Library, concrete was first made in 500 BC and can last up to 50,000 years. Concrete is one of the most important building materials. From sidewalks to skyscrapers, we see concrete everyday everywhere. There are many different kinds of concrete. Reinforced concrete is strengthened by steel.