High or ultra-high performance concrete
A binder premix includes from 0.2% to 63% of a material of an ultrafine particle size category, including individual particles with a D90 value less than 1 μm and/or with a BET specific surface greater than 5 m 2 /g; from 8% to 63% of selected Portland cement including particles with a D90 value less than 30 μm and from 25% to 85% of a material, other than the cement, of a fine particle size category, including particles for which the D10 and D90 values are from 1 μm to 120 μm and with a BET specific surface less than 5 m 2 /g. A binder mix including, in addition to the premix, a material of a medium particle size category, including particles for which the D10 and D90 values are from 120 μm to 5 mm is disclosed.
1. A binder mix, comprising in mass proportions:
from 10% to 25% of a material of an ultrafine particle size category, the individual particles of which have a D90 value less than 1 μm and/or a BET specific surface greater than 5 m 2 /g, wherein the material of the ultrafine particle size category comprises from 0 to less than 1%, by weight of a total mass of the material of the ultrafine particle size category, of silica fume;
from 8% to 25% of selected Portland cement;
from 25% to 40% of a material, other than the cement, of a fine particle size category, the particles of which have a D10 and D90 value from 1 μm to 120 μm and a BET specific surface less than 5 m 2 /g, and
from 20% to 60% of a material of a medium particle size category, the particles of which have a D10 and D90 value from 120 μm to 5 mm.
2. The binder mix according to claim 1 , comprising in mass proportions:
from 10% to 20% of the material of the ultrafine particle size category;
from 10% to 20% of the selected Portland cement;
from 25% to 33% of the material of the fine particle size category; and
from 35% to 55% of the material of the medium particle size category.
3. The binder mixing according to claim 1 , wherein the material of ultrafine particle size category does not comprise silica fume.
4. The binder mix according to claim 1 , further comprising a material of a higher particle size category, the particles of which have a D10 value greater than 5 mm.
5. The binder mix according to claim 4 , comprising in mass proportions:
from 10% to 20% of the material of the ultrafine particle size category;
from 8% to 20% of the selected Portland cement;
from 25% to 32% of the material of the fine particle size category;
from 25% to 48% of the material of the medium particle size category, and
from 20% to 60% of the material of the higher particle size category.
6. The binder mix according to claim 1 , further comprising a plasticizer, the proportion of the plasticizer being from 0.05% to 3%, expressed as a mass ratio of dry extract of the plasticizer to the total mass of the materials of the ultrafine particle size category, the Portland cement and the material of the fine particle size category.
7. The binder mix according to claim 1 , wherein the selected Portland cement is a Portland cement on which a preparation is carried out in order to retain particles of a given particle size category by sieving or by pneumatic selection.
8. The binder mix according to claim 1 , comprising in mass proportions:
from 10% to 20% of the material of the ultrafine particle size category.
9. A concrete composition, comprising a binder mix according to claim 1 and water.
10. The concrete composition according to claim 9 , having, after hardening, a compressive strength greater than or equal to 100 MPa 28 days after mixing, and/or greater than or equal to 120 MPa 28 days after mixing after a heat treatment.
11. The concrete composition according to claim 9 , wherein a W/C ratio, where W denotes the amount of water and C the amount of cement, is greater than or equal to 0.5 and lower than 1.
12. The binder mix according to claim 1 , wherein the material of the ultrafine particle size category is selected from the group consisting of limestone powder, precipitated carbonate, natural and artificial pozzolans, pumice, ground fly ash, ground material from carbonated or hydrated silicic hydraulic binder, and mixes or cogrindings thereof.
13. The binder mix according to claim 1 , wherein the material of the fine particle size category is selected from the group consisting of fly ash, pozzolan, limestone powder, siliceous powder, lime, calcium sulfate and slag.
14. The binder mix according to claim 1 , wherein the material of the medium particle size category is selected from the group consisting of sand and fine sand.
15. The binder mix according to claim 4 , wherein the material of the higher particle size category is selected from the group consisting of fine gravel, gravel, pebble and mixes thereof.