Self-leveling concrete

Patent metadata

Field	Value
Publication number	US-10611688-B2
Application number	US-201314380971-A
Country	US
Kind code	B2
Filing date	Mar 6, 2013
Priority date	Mar 7, 2012
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

The invention relates to uniformed concrete comprising, in percentages by weight, (d) 87% to 98% of particles comprising more than 90 wt.-% alumina, (c) 1% to 7% silica fume particles, (f) 1% to 8% particles of a hydraulic cement, the fraction of said particles having a size less than 40 μm being distributed as follows, in percentage by weight in relation to the weight of the unformed concrete:
fraction <0.5 μm: ≥4%, fraction <2 μm: ≥5%, fraction <10 μm: ≥19%, fraction <40 μm: 34%-52%, fraction between 2 μm and 40 μm: 26.5%-34%,

the concentration of Zro2, in percentage by weight on the basis of the uniformed concrete, being less than 2%, and the concentration of organic fibres, in percentage by weight on the basis of the uniformed concrete, being less than or equal to 0.03%.

First claim

The invention claimed is:

1. An unshaped concrete configured for the preparation of a self-levelling fresh concrete, said unshaped concrete comprising, as percentages by weight,
(a) 87% to 98% of particles comprising more than 90% by weight of alumina,
(a) 1% to 7% of particles of silica fume,
(c) more than 3% and up to 8% at most of particles of a hydraulic cement, the hydraulic cement comprising, as main constituents, alumina and calcium aluminates,

the fraction of said particles having a size of less than 40 μm being distributed, as percentages by weight with respect to the weight of the unshaped concrete, in the following way:
fraction <0.5 μm: ≥4%,
fraction <2 μm: ≥5%,
fraction <10 μm: ≥19%,
fraction <40 μm: 34%-52%,

provided that the percentage by weight, with respect to the weight of unshaped concrete, of the fraction of between 2 μm and 40 μm is between 26.5% and 34%, the content of ZrO 2 , as percentage by weight on the basis of the unshaped concrete, being less than 2% and the content of organic fibers, as percentage by weight on the basis of the unshaped concrete, being less than or equal to 0.03%.

2. The unshaped concrete as claimed in claim 1 , comprising from 0.075% to 1% of a surface-active agent and/or comprising a setting accelerator.

3. The unshaped concrete as claimed in claim 1 , in which the hydraulic cement constitutes up to 6% of the weight of the unshaped concrete.

4. The unshaped concrete as claimed in claim 1 , in which the particles of the unshaped concrete are distributed in the following way, as percentages by weight:
fraction <0.5 μm: ≥5% and/or
fraction <2 μm: ≥7.5% and/or
fraction <10 μm: ≥25% and/or
fraction <40 μm: ≥35% and ≤52%, and/or
fraction of between 2 μm and 40 μm: ≥27% and/or ≤32%.

5. The unshaped concrete as claimed in claim 1 , in which the particles of the unshaped concrete are distributed in the following way, as percentages by weight:
fraction <0.5 μm: ≥6% and/or
fraction <2 μm: ≥8% and/or
fraction <10 μm: ≥27% and/or
fraction <40 μm: ≥37% ≤52%, and/or
fraction of between 2 μm and 40 μm: ≤30%.

6. The unshaped concrete as claimed in claim 1 , in which the particles of the unshaped concrete are distributed in the following way, as percentages by weight:
fraction <0.5 μm: ≤8% and/or
fraction <2 μm: ≥10% and/or
fraction <10 μm: ≤40% and/or
fraction <40 μm: ≤50% and ≤34%.

7. The unshaped concrete as claimed in claim 1 , in which the particles of the unshaped concrete are distributed in the following way, as percentages by weight:
fraction <2 μm: ≤16% and/or
fraction <10 μm: ≤35% and/or
fraction <40 μm: ≤47% and ≥34%.

8. The unshaped concrete as claimed in claim 1 , in which the particles of the unshaped concrete are distributed in the following way, as percentages by weight:
fraction <2 μm: ≤15% and/or
fraction <40 μm: ≤43% and ≥34%.

9. The unshaped concrete as claimed in claim 1 , in which the particles of the unshaped concrete are distributed in the following way, as percentages by weight:
fraction <2 μm: ≤13%.

10. The unshaped concrete as claimed in claim 1 , which exhibits a ZrO 2 content of less than 1.5%.

11. The unshaped concrete as claimed in claim 10 , which exhibits a ZrO 2 content of less than 1%.

12. The unshaped concrete as claimed in claim 11 , which exhibits a ZrO 2 content of less than 0.5%.

13. The unshaped concrete as claimed in claim 1 , which comprises for a total of more than 95% of the weight of said unshaped concrete:
Al 2 O 3 : 81.5%-98.5%
SiO 2 : ≥0.8%.

14. The unshaped concrete as claimed in claim 1 , which exhibits the composition by weight such that:
Al 2 O 3 : ≥93% and/or
SiO 2 : ≥1.5%.

15. The unshaped concrete as claimed in claim 13 , which exhibits the composition by weight such that:
Al 2 O 3 : ≤97% and/or
SiO 2 : ≤4%.

16. The unshaped concrete as claimed in claim 1 in which the surface-active agent is a modified polycarboxylate ether.

17. The unshaped concrete as claimed in claim 1 , in which the maximum size of the particles is less than or equal to 10 mm.

18. The unshaped concrete as claimed in claim 1 , in which the fraction of the particles with a size of less than 500 μm represents more than 50% of the weight of said unshaped concrete.

19. The unshaped concrete as claimed in claim 1 , in which the fraction of the particles with a size of between 40 μm and 500 μm is between 8% and 25%, with respect to the weight of said unshaped concrete.

Assignees

• Saint Gobain Ct Recherches

Inventors

• Consales Thierry Claude

Classifications

• C04B35/62665

  Flame, plasma or melting treatment · CPC title

• C04B35/117

  Composites · CPC title

• C04B2235/3418

  Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint · CPC title

• C04B2111/00431

  Refractory materials · CPC title

• C04B2235/5472

  Bimodal, multi-modal or multi-fraction · CPC title