Hyper-fine 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 D 50 of <1 μm as at least one of a sealing agent and strengthening agent.

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 D 50  of <1 μm 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 D 50  of <1 μm. 
     
     
         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.