Concrete is made up of three basic components: water, aggregate (a combination of rock sand or gravel) and cement. Concrete is normally used as a building material and is also used for making roads. The production of concrete begins with the quarrying of limestone (CaCO3) and huge crushers break the limestone into smaller pieces. After that, all of the compounds such as the clay, cement, aggregate and iron are mixed together and heated at very high temperatures. Water is then added to this mixture to create concrete, used in every day life.