Concrete goods are prefabricated parts, such as pavement stones and products for garden and landscape design. These products are normally produced as earth-moist concretes and are subject to the requirements of both concrete technology and soil mechanics. In order to achieve a high particle density of the concrete and the necessary green and final strength, coal fly ash is used as a concrete additive. Decisive factors are the pozzolanic reactivity, the spherical grain shape and the grain-size distribution of the fly ash.