Concrete composition
A ductile ultra-high performance concrete which includes in relative parts by weight: 100 of Portland cement; 50 to 200 of a sand having a single grading with a D1O to D90 between 0.063 and 5 mm, or a mixture of sands, the finest sand having a D1O to D90 between 0.063 and 1 mm and the coarsest sand having a D1O to D90 between 1 and 5 mm; 0 to 70 of a particulate pozzolanic or non-pozzolanic material or a mixture thereof having a mean particle size less than 15 μm; 0.1 to 10 of a water-reducing superplasticizer; 10 to 30 of water; and 0.5 to 5% by volume relative to the volume of the hardened composition of glass fibers having an aspect ratio of 6 to 120.
1. A ductile ultra-high performance concrete which comprises in relative parts by weight:
100 parts by weight of Portland cement;
50 to 200 parts by weight of a sand having a single grading with a D10 to D90 between 0.063 and 5 mm, or a mixture of sands, the finest sand having a D10 to D90 between 0.063 and 1 mm and the coarsest sand having a D10 to D90 between 1 and 5 mm;
0 to 70 parts by weight of a particulate pozzolanic or non-pozzolanic material or a mixture thereof having a mean particle size less than 15 μm;
0.1 to 10 parts by weight of a water-reducing superplasticizer;
10 to 30 parts by weight of water; and
0.5 to 5% by volume relative to the volume of the hardened composition of glass fibres having an aspect ratio of 6 to 120.
2. A concrete according to claim 1 , wherein each glass fibre comprises a plurality of filaments.
3. A concrete according to claim 2 , wherein the filaments have a diameter of less than 30 μm.
4. A concrete according to claim 2 , wherein each glass fibre comprises 50 to 200 filaments.
5. A concrete according to claim 1 , wherein the glass fibres have a diameter of 0.1 to 0.5 mm.
6. A composition which comprises in relative parts by weight:
100 parts by weight of Portland cement;
50 to 200 parts by weight of a sand having a single grading with a D10 to D90 between 0.063 and 5 mm, or a mixture of sands, the finest sand having a D10 to D90 between 0.063 and 1 mm and the coarsest sand having a D10 to D90 between 1 and 5 mm;
0 to 70 parts by weight of a particulate pozzolanic or non-pozzolanic material having a mean particle size less than 15 μm;
0.1 to 10 parts by weight of a water-reducing superplasticizer; and
0.5 to 5% by volume relative to the volume of the hardened composition of glass fibres having an aspect ratio of 6 to 120,
wherein said composition is used in the preparation of a concrete according to claim 1 .
7. A process for the preparation of a concrete comprising mixing the components of a composition according to claim 6 with water.
8. A composition for preparing a concrete, the composition comprising in relative parts by weight:
100 parts by weight of Portland cement,
50 to 200 parts by weight of a sand having a single grading with a D10 to D90 between 0.063 and 5 mm or a mixture of sands the finest sand having a D10 to D90 between 0.063 and 1 mm and the coarsest sand having a D10 to D90 between 1 and 5 mm;
0 to 70 parts by weight of a particulate pozzolanic or non-pozzolanic material having a mean particle size less than 15 μm;
0.1 to 10 parts by weight of a water-reducing superplasticizer; and
0.5 to 5% by volume relative to the volume of the hardened composition of glass fibres having an aspect ratio of 6 to 120.
9. A concrete according to claim 1 in shaped form.
10. A concrete according to claim 1 , comprising 0 to 50 parts by weight of the particulate pozzolanic or non-pozzolanic material or the mixture thereof having a mean particle size less than 15 μm.
11. A concrete according to claim 10 , comprising 10 to 40 parts by weight of the particulate pozzolanic or non-pozzolanic material or the mixture thereof having a mean particle size less than 15 μm.
12. A concrete according to claim 1 , comprising 80 to 170 parts by weight of the sand having a single grading with a D10 to D90 between 0.063 and 5 mm, or the mixture of sands.
13. A concrete according to claim 12 , comprising 100 to 150 parts by weight of the sand having a single grading with a D10 to D90 between 0.063 and 5 mm, or the mixture of sands.
14. A concrete according to claim 1 , wherein the coarsest sand has a D10 to D90 between 1 and 4 mm.
15. A concrete according to claim 1 , wherein the glass fibres have an aspect ratio of 10 to 80.
16. A concrete according to claim 15 , wherein the glass fibres have an aspect ratio of 20 to 40.
17. A composition according to claim 6 , comprising 0 to 50 parts by weight of the particulate pozzolanic or non-pozzolanic material or the mixture thereof having a mean particle size less than 15 μm.
18. A composition according to claim 17 , comprising 10 to 40 parts by weight of the particulate pozzolanic or non-pozzolanic material or the mixture thereof having a mean particle size less than 15 μm.
19. A composition according to claim 6 , comprising 80 to 170 parts by weight of the sand having a single grading with a D10 to D90 between 0.063 and 5 mm, or the mixture of sands.
20. A composition according to claim 19 , comprising 100 to 150 parts by weight of the sand having a single grading with a D10 to D90 between 0.063 and 5 mm, or the mixture of sands.
21. A composition according to claim 6 , wherein the coarsest sand has a D10 to D90 between 1 and 4 mm.
22. A composition according to claim 6 , wherein the glass fibres have an aspect ratio of 10 to 80.
23. A composition according to claim 22 , wherein the glass fibres have an aspect ratio of 20 to 40.