Patent ID: 8361220

Claim:
A method of making a cementitious composition comprising forming a mixture of water, hydraulic cement and a strength improvement admixture composition, said admixture composition comprising the components of: a. polycarboxylate dispersant; b. set retarder; and c. a strength improvement additive selected from the group consisting of poly(hydroxyalkylated)polyethyleneamines, poly(hydroxyalkylated)polyethylenepolyamines, poly(hydroxyalkylated)polyethyleneimines, poly(hydroxyalkylated)polyamines, hydrazines, 1,2-diaminopropane, polyglycoldiamine, poly(hydroxyalkyl)amines and mixtures thereof; wherein the amount of polycarboxylate dispersant is from about 5% to about 80%, the set retarder is from about 0.5% to about 40%, and the strength improvement additive is from about 0.5% to about 40% based on the total dry weight of the polycarboxylate dispersant, the set retarder and the strength improvement additive.