Abstract: Cationic aqueous bituminous emulsion-aggregate slurries are disclosed to be formed with aggregate and cationic emulsions prepared at elevated temperatures by emulsifying bitumen, such as an asphalt, in water with a cation-active emulsifier prepared as the reaction product of a polyamine with certain polycarboxylic acids or anhydrides wherein there is added to the aggregate mixing water prior to the addition of the bituminous emulsion, as set retarder, the blend of the respective reaction products of (1) a C.sub.8 -C.sub.15 alkylphenol and from 15 to 100 moles ethylene oxide and (2) a polyamine or of a modified polyamine with kraft lignin or maleinized kraft lignin and, preferably, their blends certain polycarboxylic acids and anhydrides.