BINDER FOR BUILDING MATERIALS, METHOD FOR PRODUCTION THEREOF AND PLANT FOR CARRYING OUT THIS METHOD

A binder for building materials comprising cement and mineral grinding additives, said grinding additives containing ash of burned refuse. Relative to the binder, the ash of burned refuse has a weight percent of 0.005 to 0.4 and a Blaine specific surface area of 1500 cm2/g to 6000 cm2/g. Also, a process and to a plant for carrying out the process for production of a binder for building materials comprising cement and mineral grinding additives, the grinding additives containing ash of burned refuse, the process including: preparing the ash of burned refuse provided as grinding additive by separating out the fraction having a particle size less than 1 mm and the oversize particles having a particle size greater than 40 mm; pre-crushing the ash of burned refuse which has been freed from the undersize particles and the oversize particles; removing ferrous and non-ferrous metals; further crushing of the pre-crushed ash of burned refuse which has been substantially freed from metals, in order to achieve a Blaine specific surface area from 1500 cm2/g to 6000 cm2/g, adding the ash of burned refuse prepared in this way to the cement before and/or after the further crushing of the ash of burned refuse which has been pre-crushed and substantially freed from metals.