In general magazines or media, one often reads or hears that concrete consists of sand, gravel, cement and water. If sand and gravel are regarded as one unit, we speak of a 3-component system. In the early days of industrial concrete production, the majority of concretes were classified in such a 3-component system. This also worked very well for years up to certain limits. It is only since researchers and concrete technologists have been pushing the limits of what is possible that it has been found that, with the help of concrete chemistry (admixtures) and finely dispersed powdery substances (additives), the performance of concrete could still be significantly increased. The 5-component system was born.