Concrete - is a very hard and solid building material when dry, consisting of cement, water and aggregate (e.g. sand), which is also referred to as artificial stone. Concrete is a building material that can be used in a variety of ways. Due to its properties, it can holistically meet the optical, static and building physics requirements. For this reason, buildings can consist entirely of this material. In addition, due to its mechanical properties, it is an ideal substrate for fastening heavy loads.