The present invention relates to a bituminous composition comprising a mixture: a bitumen base, which represents at least 50% by weight, and preferably at least 80% by weight, and preferentially at least 90% by weight, of the total weight of the composition, and a hydroxide XOH with X=Na or K, which represents from 0.001 to 1% by weight of the total weight of the composition, said bitumen base having an intrinsic stability S from 1 to 2.5 and/or a peptisation level Sa from 0 to 0.6, said values S and Sa being measured according to standard ASTM D 7157-12, as well as the method of preparation and uses thereof, particularly in the field of road construction.