The most common and universal brand of concrete M200, which is assigned class B15, and its strength is 196 kg/cm2. This concrete, as a rule, is used to pour foundations with an average degree of load, installation of retaining walls and intensely operated tracks. Like other concrete brands, M200 differs from the rest with different proportions of concrete, gravel and sand. In addition, a smaller crushed stone can be added to give specific characteristics. Chemical impurities are added to higher brands of concrete in order for it to be able to withstand significant loads.