The invention relates to a method for producing a pozzolanic or latent-hydraulic cement clinker substitute in which clay is calcined at temperatures ranging between 500 and 1250 DEG C, preferably between 550 and 1150 DEG C and most preferred between 700 and 900 DEG C, using a fuel that comprises a mineral substance, the resulting mixture of the mineral substance of the fuel and the calcined clay forming said pozzolanic or latent-hydraulic cement clinker substitute, and the proportion of the mineral substance introduced into the hydraulic cement clinker substitute by the fuel being between 1 and 60 % by weight.