Patent ID: 7044170

Claim:
A method of making a reduced fluid loss post-tensioned hydraulic cementitious grout article comprising: inserting at least one bar member into a channel; securing a first end of the bar member; stretching the bar member; securing a second end of the bar member; introducing into the channel a reduced fluid loss hydraulic cementitious grout composition comprising hydraulic cement, water, and a copolymer, wherein the copolymer comprises at least two components selected from a), b) and c): wherein a) is the component wherein R 1 =is at least one of hydrogen or methyl; R 2 , R 3 , R 4 =are each independently hydrogen, aliphatic hydrocarbon radical with 1 to about 6 carbon atoms, or phenyl radical; V=NH or oxygen; M=hydrogen, monovalent metal cation, bivalent metal cation, ammonium, or an organic amino radical; n=about 1 to about 5; e=0.5 or 1; b) is at least one component selected from the group consisting of wherein W=—CO—, —CO—(CH 2 ) x —, —CO—NR 2 —(CH 2 ) x —; R 1 =is at least one of hydrogen or methyl; R 2 =hydrogen, aliphatic hydrocarbon radical with 1 to about 6 carbon-atoms, or phenyl radical; x=about 1 to about 6; R 5 and R 6 =are each independently hydrogen, alkyl group containing 1 to about 4 carbon atoms, aliphatic hydrocarbon radical containing 1 to about 20 carbon atoms, alicyclic hydrocarbon radical containing about 5 to about 8 carbon atoms, or aryl radical containing about 6 to about 14 carbon atoms; Q=hydrogen or —CHR 5 R 7 ; R 7 =hydrogen, aliphatic hydrocarbon radical containing 1 to about 4 carbon atoms, —COOH or —COOM a ; M=hydrogen, monovalent metal cation, bivalent metal cation, ammonium, or an organic amino radical; a=0.5 or 1; c) is at least one component selected from the group consisting of wherein R 1 =is at least one of hydrogen or methyl; R 2 and R 3 =are each independently hydrogen, aliphatic hydrocarbon radical with 1 to about 6 carbon-atoms, or phenyl radical; R 5 and R 6 =are each independently hydrogen, alkyl group containing 1 to about 4 carbon atoms, aliphatic hydrocarbon radical containing 1 to about 20 carbon atoms, alicyclic hydrocarbon radical containing about 5 to about 8 carbon atoms, or aryl radical containing about 6 to about 14 carbon atoms; R 8 =R 5 or R 6 , —(CH 2 ) x —SO 3 ⊖ (M), Y=O, NH or NR 5 ; V=—(CH 2 ) x —, X=halogen, C 1 - to C 4 -alkylsulfate or C 1 - to C 4 -alkylsulfonate; and M=hydrogen, monovalent metal cation, bivalent metal cation, ammonium, or an organic amino radical.