Quick binder for self compacting concrete, use and application of same

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 Ri are ethylene, 0 to 50% of the Ri 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 Ri 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 Ri are similar or different to each other and are selected from:
• *the A—PO3H2 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(Ri—O)n] groups carried by all the RJ,
• “g” is the number of [R—O(Ri—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 RJ can form together one or more rings, said ring or rings optionally comprising one or more heteroatoms.