Method for producing concrete, comprising - transferring quantities of granular materials having different particle sizes into separate storage hoppers, - pouring dosed quantities of at least one of said granular materials from at least one of said hoppers of a first set of storage hoppers onto a first transport belt which, as a means of transport, runs along a direction, in a first direction, - pouring dosed quantities of at least one of said granular materials from at least one of said hoppers of a second set of storage hoppers onto a second transport belt which, as a means of transport, runs along said direction, in a second direction opposite to the first, and - transporting these dosed quantities of granular materials by means of said transport belts to a conveyor belt which conveys them to the top of two separate mixing towers, in each of which these granular materials are mixed with hydraulic binder, water and possibly adjuvants, to form a pasty mass of concrete, to be discharged for use thereof, - said transporting step comprising, in a selectable manner, supplying the conveyor belt with granular materials by means of the first transport belt or supplying the conveyor belt by means of the second transport belt, said transporting step further comprising, in a selectable manner, supplying the conveyor belt simultaneously by means of the first transport belt and by means of the second transport belt, the method being characterised by the use of an impact plate arranged between the two discharge ends of the two transport belts (6, 6') to be freely pivotable about an axis perpendicular to the running direction of the transport belts, and in that said dosed quantities of granular materials are conveyed to the top of each of the mixing towers by the conveyor belt in a selectable manner through pivoting of an inclined guide plate, which directs the dosed quantities of materials into an aggregate tank of one mixing tower or into an aggregate tank of the other mixing tower. - transferring quantities of granular materials having different particle sizes into separate storage hoppers, - pouring dosed quantities of at least one of said granular materials from at least one of said hoppers of a first set of storage hoppers onto a first transport belt which, as a means of transport, runs along a direction, in a first direction, - pouring dosed quantities of at least one of said granular materials from at least one of said hoppers of a second set of storage hoppers onto a second transport belt which, as a means of transport, runs along said direction, in a second direction opposite to the first, and - transporting these dosed quantities of granular materials by means of said transport belts to a conveyor belt which conveys them to the top of two separate mixing towers, in each of which these granular materials are mixed with hydraulic binder, water and possibly adjuvants, to form a pasty mass of concrete, to be discharged for use thereof, - said transporting step comprising, in a selectable manner, supplying the conveyor belt with granular materials by means of the first transport belt or supplying the conveyor belt by means of the second transport belt,