The present invention provides methods for modifying cementitious materialscontaining clay-bearingaggregates. The methods comprise mixing a carboxylate graft polymer with acementitious binder and a plurality of clay-bearing aggregates in an amount of1% to 50% byweight based on dry weight of clay contained in the plurality of aggregates,the carboxylate graftpolymer comprising a first component represented by structure (A) and a secondcomponentrepresented by structure (B) in a molar ratio in the range of 0.5 to 1.5 offirst component:secondcomponent, and having a weight-average molecular weight in the range of 70,000to 150,000.Such clay-mitigation is particularly useful for treating clay and clay-bearingaggregates,particularly those aggregates used for construction purposes. The presentinvention minimizesthe need to wash the aggregates, thus preserving fine aggregates ("fines")content inconstruction materials, and thereby beneficiating the performance and/orproperties ofconstruction materials containing the clay-bearing aggregates.
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