Patent ID: 7556684

Claim:
A cementitious composition consisting essentially of hydraulic cement and a strength improvement admixture for cementitious compositions comprising: a. polycarboxylate dispersant; and b. a strength improvement additive selected from the group consisting of poly(hydroxyalkylated)polyethyleneamines, poly(hydroxyalkylated)polyethylenepolyamines, poly(hydroxyalkylated)polyethyleneimines, poly(hydroxyalkylated)polyamines, 1,2-diaminopropane, polyglycoldiamine, poly(hydroxyalkyl)amines and mixtures thereof; wherein the amount of polycarboxylate dispersant is from about 40% to about 95% and the amount of strength improvement additive is greater than 5% to about 60% based on the total dry weight of the polycarboxylate dispersant and strength improvement additive.