A method for mitigating the effects of clay in aggregates, comprising: introducing to clay contained in a plurality of aggregates, in an amount of 1% to 50% by weight based on dry weight of the clay contained in said aggregates, a water-soluble functionalized polyamine comprising a water-soluble polyamine formed by reacting at least one of the amine compounds represented by the structural formulae through below with an epoxy compound represented by the structural formula below: wherein R 1 to R 12 each independently represent hydrogen or a C 1 to C 3 alkyl group; "m" and "n" each independently represent an integer of 1 to 6; "X" represents chlorine, bromine, iodine atom, or mixture thereof; and the molar ratio of hydrogen bonded to nitrogen of said amine compound to the epoxy group of said epoxy compound is from 50:50 to 75:25; wherein said water-soluble polyamine is being functionalized using at least one functionalizing agent selected from the following compounds: a halide compound comprising methyl chloride, ethyl chloride, propyl chloride, allyl chloride, benzyl chloride, or a mixture thereof; a halide compound comprising 3-chloro-2-hydroxypropyl trimethylammonium chloride, 3-chloro-2-hydroxypropyl lauryl dimethylammonium chloride, 3-chloro-2-hydroxypropyl dimethyl stearyl ammonium chloride, 3-chloro-2-hydroxypropyl dimethyl cocoalkylammonium chloride, or a mixture thereof; a sulfate compound comprising dimethyl sulfate, diethyl sulfate, methyl ethyl sulfate, methyl propyl sulfate, or a mixture thereof; a epoxy compound comprising glycidyl trimethylammonium chloride, glycidyl triethylammonium chloride, glycidyl dimethyl propylammonium chloride, glycidyl dimethylhexylammonium chloride, glycidyl dipropyldecylammonium bromide, glycidyl dimethyl laurylammonium chloride, or a mixture thereof, a dihalide compound comprising dichloroethane, dibromobutane, dichlorobenzene, 1-bromo-4-chlorobenzene, or a mixture thereof, and wherein the dry weight ratio of said polyamine to said functionalizing agent is from 99.5:0.5 to 85:15. introducing to clay contained in a plurality of aggregates, in an amount of 1% to 50% by weight based on dry weight of the clay contained in said aggregates, a water-soluble functionalized polyamine comprising a water-soluble polyamine formed by reacting at least one of the amine compounds represented by the structural formulae through below with an epoxy compound represented by the structural formula below: wherein R 1 to R 12 each independently represent hydrogen or a C 1 to C 3 alkyl group; "m" and "n" each independently represent an integer of 1 to 6; "X" represents chlorine, bromine, iodine atom, or mixture thereof; and the molar ratio of hydrogen bonded to nitrogen of said amine compound to the epoxy group of said epoxy compound is from 50:50 to 75:25; wherein said water-soluble polyamine is being functionalized using at least one functionalizing agent selected from the following compounds: a halide compound comprising methyl chloride, ethyl chloride, propyl chloride, allyl chloride, benzyl chloride, or a mixture thereof; a halide compound comprising 3-chloro-2-hydroxypropyl trimethylammonium chloride, 3-chloro-2-hydroxypropyl lauryl dimethylammonium chloride, 3-chloro-2-hydroxypropyl dimethyl stearyl ammonium chloride, 3-chloro-2-hydroxypropyl dimethyl cocoalkylammonium chloride, or a mixture thereof; a sulfate compound comprising dimethyl sulfate, diethyl sulfate, methyl ethyl sulfate, methyl propyl sulfate, or a mixture thereof; a epoxy compound comprising glycidyl trimethylammonium chloride, glycidyl triethylammonium chloride, glycidyl dimethyl propylammonium chloride, glycidyl dimethylhexylammonium chloride, glycidyl dipropyldecylammonium bromide, glycidyl dimethyl laurylammonium chloride, or a mixture thereof, a dihalide compound comprising dichloroethane, dibromobutane, dichlorobenzene, 1-bromo-4-chlorobenzene, or a mixture thereof, and a halide compound comprising methyl chloride, ethyl chloride, propyl chloride, allyl chloride, benzyl chloride, or a mixture thereof; a halide compound comprising 3-chloro-2-hydroxypropyl trimethylammonium chloride, 3-chloro-2-hydroxypropyl lauryl dimethylammonium chloride, 3-chloro-2-hydroxypropyl dimethyl stearyl ammonium chloride, 3-chloro-2-hydroxypropyl dimethyl cocoalkylammonium chloride, or a mixture thereof; a sulfate compound comprising dimethyl sulfate, diethyl sulfate, methyl ethyl sulfate, methyl propyl sulfate, or a mixture thereof; a epoxy compound comprising glycidyl trimethylammonium chloride, glycidyl triethylammonium chloride, glycidyl dimethyl propylammonium chloride, glycidyl dimethylhexylammonium chloride, glycidyl dipropyldecylammonium bromide, glycidyl dimethyl laurylammonium chloride, or a mixture thereof, a dihalide compound comprising dichloroethane, dibromobutane, dichlorobenzene, 1-bromo-4-chlorobenzene, or a mixture thereof, and wherein the dry weight ratio of said polyamine to said functionalizing agent is from 99.5:0.5 to 85:15.