Ultra-high performance concrete

1. A hydraulic composition comprising in relative parts by mass with respect to the cement:

100 parts of cement the particles of which have a BET specific surface area comprised from 1.20 to 5 m 2 /g;

32 to 42 parts of water;

5 to 50 parts of a mineral addition A1 the particles of which have a D50 less than or equal to 6 μm and selected from silica fume, metakaolin, slag, pozzolans or mixtures thereof;

90 to 230 parts of sand the particles of which have a D50 greater than or equal to 50 μm and a D90 less than or equal to 3 mm;

0.0001 to 10 parts of a superplasticizer.

2. The hydraulic composition according to claim 1 , comprising in relative parts by mass with respect to the cement:

100 parts of cement the particles of which have a BET specific surface area comprised from 1.20 to 1.7 m 2 /g;

38 to 42 parts of water;

8 to 20 parts of a mineral addition A1 the particles of which have a D50 less than or equal to 6 μm and selected from silica fume, metakaolin, slag, pozzolans or mixtures thereof;

90 to 180 parts of sand the particles of which have a D50 comprised from 100 μm to 400 μm and a D90 less than or equal to 800 μm;

0.0001 to 10 parts of a superplasticizer, the active material concentration of which is 15% by mass.

3. The hydraulic composition according to claim 1 , further comprising from 0.001 to 2 parts of a viscosity-modifying agent expressed in relative parts by mass with respect to the cement.

4. The hydraulic composition according to claim 1 , wherein the cement is a CEM I cement.

5. The hydraulic composition according claim 1 , further comprising from 0 to 300 parts of a mineral addition A2, differing from A1, the particles of which have a D50 comprised from 1 μm to 50 μm, expressed in relative parts by mass with respect to the cement.

6. The hydraulic composition according to claim 1 , further comprising from 0 to 10 parts of anhydrous calcium sulfate expressed in relative parts by mass with respect to the cement.

7. The hydraulic composition according to claim 1 , further comprising mineral fibers, organic fibers or metal fibers or a mixture thereof.

8. The hydraulic composition according to claim 1 , further comprising from 0 to 0.5 parts of antifoaming agent expressed in relative parts by mass with respect to the cement.

9. A method for producing a hydraulic composition according to claim 1 , comprising mixing the cement, additions, sand, water and superplasticizer are mixed.

10. An object formed for the field of construction comprising the hydraulic composition according to claim 1 .

11. A method for manufacturing an object for the field of construction comprising:

(i) preparing a hydraulic composition according to claim 1 ;

(ii) applying the composition prepared at step (i) to a support.

12. The production method according to claim 11 , further comprising a mould release step (iii) after hardening of the hydraulic composition.

13. The production method according to claim 11 , further comprising a step to pump the hydraulic composition after step (i).

14. The production method according to claim 11 , wherein the support at step (i) is a mould, a wall, a partition or a floor.

15. The production method according to claim 11 , wherein step (ii) is performed by projecting the hydraulic composition.

16. A method for manufacturing an object for the field of construction comprising:

(i) preparing a hydraulic composition according to claim 2 ;

(ii) applying the composition prepared at step (i) to a support, wherein step (ii) is performed by spraying the hydraulic composition.

17. A method for manufacturing an object for the field of construction comprising:

(i) preparing a hydraulic composition according to claim 3 ;

(ii) applying the composition prepared at step (i) to a support, characterized in that step (ii) is performed by casting or calendering the hydraulic composition.