Patent ID: 7029527

Claim:
A quick binder for self-compacting concrete comprising by weight, based on the weight of the quick binder in a dry state: 70 to 90% Portland cement, 4 to 16% calcium aluminate, 4 to 14% calcium sulphate in an anhydrite form, a setting accelerator and a setting retarder, at least an adjuvant comprising a water reducer, wherein: the water reducer comprises at least a superplasticizer made of a water soluble or water dispersible organic compound, comprising at least an amino-di(alkylene-phosphonic) group and at least a polyoxyalkylated chain, and wherein the superplasticizer is a compound (I) or a salt of the compound (I), said compound (I) having the formula: wherein, R is a hydrogen atom or a monovalent hydrocarbon group, saturated or unsaturated, comprising 1 to 18 carbon atoms and optionally, one or more heteroatoms; 50 to 100% of the R i are ethylene, 0 to 50% of the R i are similar or different to each other and represent an alkylene selected from propylene, butylene, amylene, octylene or cyclohexene, or an arylene selected from styrene or methylstyrene, the R i optionally comprising one or more heteroatoms, Q is a hydrocarbon group having 2 to 18 carbons atoms and optionally, one or more heteroatoms, A is an alkylene group having 1 to 3 carbon atoms, the R i are similar or different to each other and are selected from: *the A—PO 3 H 2 group, wherein A is an alkylene group having 1 to 3 carbon atoms, *and the group: —B is an alkylene group comprising 2 to 8 carbon atoms, A is an alkylene group having 1 to 3 carbon atoms, “n” is an number ranging from 20 to 250, “r” is the number of [R—O(R i —O) n ] groups carried by all the R J , “g” is the number of [R—O(R i —O) n ] groups carried by Q, the “r+q” sum is at the most equal to 3, “y” is an integer equal to 1 or 2, Q, N and the R J can form together one or more rings, said ring or rings optionally comprising one or more heteroatoms.