HYPER-FINE CEMENT

• US 20120255733A1
• Filed: 06/18/2012
• Published: 10/11/2012
• Est. Priority Date: 09/05/2007
• Status: Abandoned Application

• Current Assignee: EPG (ENGINEERED NANOPRODUCTS GERMANY) AG
• Original Assignee: EPG (ENGINEERED NANOPRODUCTS GERMANY) AG
• Inventors: SCHMIDT, Helmut, GENOLET, Luis
• Application Number:
  US13/525,480
• Publication Number:
  US 20120255733A1
• Time in Patent Office: Days
• US Class Current: 166/285
• CPC Class Codes: C04B 2111/28 Fire resistance, i.e. materials resistant to accidental fires or high temperatures
• CPC Class Codes: C04B 2111/70 Grouts, e.g. injection mixtures for cables for prestressed concrete
• CPC Class Codes: C04B 2111/72 Repairing or restoring existing buildings or building materials
• CPC Class Codes: C04B 24/122 Hydroxy amines
• CPC Class Codes: C04B 28/04 Portland cements
• CPC Class Codes: C04B 7/527 obtaining cements characterised by fineness, e.g. by multi-modal particle size distribution
• CPC Class Codes: C09K 8/46 containing inorganic binders, e.g. Portland cement

Abstract

A process for sealing or strengthening porous molded articles, rock or porous informations. The process comprises using hyper-fine cement having a particle size D₅₀ of <1 μm as at least one of a sealing agent and strengthening agent.

Claims

1. A process for sealing or strengthening porous molded articles, rock or porous formations, wherein the process comprises using hyper-fine cement having a particle size D₅₀ of <

1 μ

m as at least one of a sealing agent and a strengthening agent.

2. The process of claim 1, wherein sealing is carried out in oilfields.

3. The process of claim 1, wherein sealing is carried out in natural gas fields.

4. The process of claim 1, wherein the process comprises pumping or infiltrating a slurry which comprises the cement and water into the porous molded articles, rock or porous formations.

5. The process of claim 1, wherein the porous moulded articles comprise at least one of sand, gravel, metal, plastic, and ceramic.

6. The process of claim 1, wherein the porous formations comprise geological formations.

7. The process of claim 1, wherein the porous formations comprise formations composed of at least one of sand, earth, and sandstone.

8. The process of claim 1, wherein the hyper-fine cement has been obtained by a process A comprising wet milling of a cement or a cement clinker in a non-aqueous solvent to obtain the hyper-fine cement.

9. The process of claim 8, wherein process A is carried out in the presence of a grinding aid.

10. The process of claim 9, wherein the grinding aid comprises triethanolamine.

11. The process of claim 8, wherein the wet milling is carried out in at least one of a ball mill and a rotational ball mill.

12. The process of claim 8, wherein process A further comprises mixing the hyper-fine cement in dry form with water to form a low-viscosity slurry.

13. The process of claim 1, wherein the cement comprises portland cement.

14. The process of claim 1, wherein the cement additionally comprises at least one cement additive selected from retarders and diffusion blockers.

15. The process of claim 1, wherein the hyper-fine cement has been obtained by a process B comprising wet milling of portland cement in a non-aqueous solvent which comprises isopropanol and in the presence of a grinding aid which comprises triethanolamine to obtain the hyper-fine cement.

16. The process of claim 15, wherein process B further comprises at least partly separating the non-aqueous solvent and the grinding aid from the hyper-fine cement obtained after milling.

17. The process of claim 15, wherein the wet milling is carried out in at least one of a ball mill and a rotational ball mill.

18. A process for at least one of repairing damaged masonry by injection, forming fiber-reinforced cement components by infiltration, strengthening loose earth, strengthening building plaster or render, constructions and walls, sealing or renovating masonry or restoring buildings, producing components by infiltration of powder, and sealing landfills, wherein the process comprises using hyper-fine cement having a particle size D₅₀ of <

1 μ

m.

19. The process of claim 18, wherein the hyper-fine cement has been obtained by a process comprising wet milling of a cement or a cement clinker in a non-aqueous solvent to obtain the hyper-fine cement.

20. The process of claim 18, wherein the cement comprises portland cement.