Patent ID: 7625960

Claim:
A lime-free admixture composition for use with hydraulic cement, the admixture which is a dry powder, comprising, in combination: at least one emulsifier selected from the group of surfactants consisting of anionic, cationic, amphoteric and non-ionic, at least one toughening resin selected from the group consisting of isoprene polymer rubbers, isoprene copolymer rubbers, styrene/butadiene/styrene copolymer rubbers and nitrile copolymer rubbers, emulsified by said emulsifier and at least one accelerator wherein said accelerator comprises a thiosulfate salt of a cation selected from the group consisting of lithium, sodium, potassium, barium, calcium and ammonium, for hardening a mixture comprising hydraulic cement, a plurality of aggregates, water and the lime-free admixture composition.