Patent ID: 8828137

Claim:
An additive composition for mixing into a cementitious blend including an inorganic binder and an inorganic filler, the additive composition comprising: a nitrogen-containing polymer comprising monomers selected from the group consisting of vinyl amines, vinyl formamides, ethyleneamines, ethyleneimines, aminoethyl methacrylates, and caprolactams; a carrier component; and a reactive agent capable of crosslinking with the nitrogen of the polymer in situ within the cementitious blend; wherein the reactive agent is selected from the group consisting of: polyaldehydes selected from glyoxal, blocked glyoxal, glutaraldehyde, ketone formaldehyde and succinic dialdehyde; a dicarboxylic anhydride or polymer thereof; an epichlorohydrin resin; a zirconium salt; a cyclic amide condensate; and a polycarboxylic acid; and wherein the reactive agent is reversibly reacted with the carrier component prior to being provided to the additive composition.