The invention relates to a method for treated polluted soils, which comprises mixing said soil with a hydraulic binder, characterised in that said hydraulic binder comprises: as the only high-alumina clinker, a high-alumina clinker comprising more than 80 wt% of mayenite C12A7 phase or a mayenite isotope, said high-alumina clinker making up at least 70 wt% of the weight of the hydraulic binder; and 1 wt% to 30 wt%, relative to the total weight of the binder, of lime. The invention likewise relates to the use of the method according to the invention in order to stabilise soils on site or before storing polluted soils.
