FLUIDIZING MIX FOR A COMPOSITION WITH A BASE OF HYDRAULIC BINDER

1 . A hydraulic composition comprising:

at least one hydraulic binder;

at least one first water-reducing additive comprising at least one phosphonic amino-alkylene group;

at least one second water-reducing additive comprising at least one polymer with a comb structure, the concentration by weight of dry extract of the second additive being strictly greater than 25% and strictly less than 100% of the concentration by weight of dry extract of the first additive.

2 . The hydraulic composition according to claim 1 , wherein the concentration by weight of dry extract of the second additive is less than or equal to 90% of the concentration by weight of dry extract of the first additive.

3 . The hydraulic composition according to claim 1 , wherein the concentration by weight of dry extract of the second additive is from 26% to 99% of the concentration by weight of dry extract of the first additive.

4 . The hydraulic composition according to claim 3 , wherein the concentration by weight of dry extract of the second additive is from 30% to 95% of the concentration by weight of dry extract of the first additive.

5 . The hydraulic composition according to claim 1 , wherein the second additive is a polymer of the polyalkylene oxide polycarboxylate type.

6 . The hydraulic composition according to claim 1 , wherein the first additive corresponds to the formula:

in which:

R is a hydrogen atom or a monovalent hydrocarbon group with 1 to 18 carbon atoms and optionally one or more hetero atoms;

the R i are similar or different and represent an alkylene for example ethylene, propylene, amylene, octylene or cyclohexene or an arylene, for example styrene or methylstyrene, the R i optionally comprising one or more hetero atoms;

Q is a hydrocarbon group with 2 to 18 carbon atoms and optionally one or more hetero atoms;

A is an alkylidene group with 1 to 5 carbon atoms;

the R j are similar or different and may be selected from:

the A-PO 3 H 2 group, A having the aforesaid meaning;

an alkyl group with 1 to 18 carbon atoms and being able to carry [R—O(R i —O) n ] groups, R and R i having the aforesaid meanings;

and the group:

R k designating a group such as R j ;

B designating an alkylene group with 2 to18 carbon atoms;

“n” is a number greater than or equal to 0;

“r” is the sum of the [R—O(R i —O) n ] groups carried by all the R j ;

“q” is the number of [R—O(R i —O) n ] groups carried by Q;

the sum “r+q” is from 1 to 10;

“y” is an integer from 1 to 3;

Q, N and the R j can form together one or more cycles, this or these cycles further being able to contain one or more other hetero atoms.

7 . A concrete comprising a hydraulic composition according to claim 1 mixed with water.

8 . A fluidizing mix for a hydraulic binder comprising at least one first water-reducing additive comprising at least one phosphonic amino-alkylene group and at least one second water-reducing additive comprising at least one polymer with a comb structure, the concentration by weight of dry extract of the second additive being strictly greater than 25% and strictly less than 100% of the concentration by weight of dry extract of the first additive.

9 . The fluidizing mix according to claim 8 , wherein the concentration by weight of dry extract of the second additive is less than or equal to 90% of the concentration by weight of dry extract of the first additive.

10 . The fluidizing mix according to claim 8 , wherein the concentration by weight of dry extract of the second additive is greater than or equal to 10% of the concentration by weight of dry extract of the first additive.

11 . The fluidizing mix according to claim 10 , wherein the concentration by weight of dry extract of the second additive is greater than or equal to 20% of the concentration by weight of dry extract of the first additive.

12 . The fluidizing mix according to claim 8 , wherein the second additive is a polymer of the polyalkylene oxide polycarboxylate type.

13 . The fluidizing mix according to claim 8 , wherein the first additive corresponds to the formula:

in which:

R is a hydrogen atom or a monovalent hydrocarbon group with 1 to 18 carbon atoms and optionally one or more hetero atoms;

the R i are similar or different and represent an alkylene for example ethylene, propylene, amylene, octylene or cyclohexene or an arylene, for example styrene or methylstyrene, the R i optionally comprising one or more hetero atoms;

Q is a hydrocarbon group with 2 to 18 carbon atoms and optionally one or more hetero atoms;

A is an alkylidene group with 1 to 5 carbon atoms;

the R j are similar or different and may be selected from:

the A-PO 3 H 2 group, A having the aforesaid meaning;

an alkyl group with 1 to 18 carbon atoms and being able to carry [R—O(R i —O) n ] groups, R and R i having the aforesaid meanings;

and the group:

R k designating a group such as R j ;

B designating an alkylene group with 2 to 18 carbon atoms;

”n” is a number greater than or equal to 0;

“r” is the sum of the [R—O(R i —O) n ] groups carried by all the R j ;

“q” is the number of [R—O(R i —O) n ] groups carried by Q;

the sum “r+q” is from 1 to 10;

“y” is an integer from 1 to 3;

Q, N and the R j can form together one or more cycles, this or these cycles further being able to contain one or more other hetero atoms.

14 . The fluidizing mix according to claim 8 , wherein the first additive corresponds to the formula:

in which:

M is a linear or branched hydrocarbon group optionally comprising one or more hetero atoms;

Q is a hydrocarbon group with 2 to 18 carbon atoms and optionally one or more hetero atoms;

“p” is the number of [M] groups carried by Q, p being from 1 to 10; and

“y” is an integer from 1 to 3.