WO1990014322A1 - Method and plant for the production of injectable cement mixtures - Google Patents
Method and plant for the production of injectable cement mixtures Download PDFInfo
- Publication number
- WO1990014322A1 WO1990014322A1 PCT/EP1990/000810 EP9000810W WO9014322A1 WO 1990014322 A1 WO1990014322 A1 WO 1990014322A1 EP 9000810 W EP9000810 W EP 9000810W WO 9014322 A1 WO9014322 A1 WO 9014322A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cement
- suspension
- mixture
- milling
- plant
- Prior art date
Links
- 239000004568 cement Substances 0.000 title claims abstract description 86
- 239000000203 mixture Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000000725 suspension Substances 0.000 claims abstract description 67
- 238000003801 milling Methods 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000654 additive Substances 0.000 claims abstract description 19
- 239000002689 soil Substances 0.000 claims abstract description 19
- 238000001033 granulometry Methods 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- 230000000996 additive effect Effects 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000011435 rock Substances 0.000 claims abstract description 9
- 239000007900 aqueous suspension Substances 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 24
- 239000010419 fine particle Substances 0.000 claims description 19
- 239000004576 sand Substances 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 16
- 239000011362 coarse particle Substances 0.000 claims description 14
- 239000002253 acid Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 230000035699 permeability Effects 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229920000137 polyphosphoric acid Polymers 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000011888 foil Substances 0.000 claims 1
- 239000011347 resin Substances 0.000 claims 1
- 229920005989 resin Polymers 0.000 claims 1
- 238000009826 distribution Methods 0.000 description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- 229910052708 sodium Inorganic materials 0.000 description 5
- 238000007596 consolidation process Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000012669 compression test Methods 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- 239000004005 microsphere Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 101000837626 Homo sapiens Thyroid hormone receptor alpha Proteins 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 102100028702 Thyroid hormone receptor alpha Human genes 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 239000012764 mineral filler Substances 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000003921 particle size analysis Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 235000019351 sodium silicates Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0025—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability obtaining colloidal mortar
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
- C04B7/52—Grinding ; After-treatment of ground cement
Definitions
- the present invention concerns a method for the production of cement mixtures suitable to be used, thanks to their characteristics of permeability at low viscosities, in consolidation injections and/or in sealing fine grain soils or rocks and/or porous or microfractured materials.
- the present invention further concerns a plant for carrying-out the above mentioned method.
- the known methods at present used for the consolidation of sandy soils generally involve the injection of mixtures based on sodium silicates. Such techniques, while foreseeing a setting time compatible with the duration of the operation and while giving good sealing properties and mechanical cohesion to the treated soils, have the drawback of creating a possible source of pollution of the groundwater due to the release of water-soluble chemical substances.
- Cement is an ideal product for this purpose, because it allows to obtain excellent consolidation results and, being insoluble, it does not affect the groundwater.
- a known method for obtaining cement mixtures with sufficiently fine particle size to be injected into the ground provides for decanting a suspension of a commercially available cement into water to separate by settling the heaviest fraction, which is about 80% of the total cement used, from the supernatant suspeneion, which contains, the finest particles and can be uniformly injected into the soil.
- GB-A-494856 in the name of H. Ridley, discloses the preparation of a cement mortar by milling an aqueous mixt ⁇ re of cement and sand or other solids to a gel consistency.
- the obtained mixture is then sprayed on a surface (e.g. the walls of a tunnel), on which it adheres because of its gelly consistency.
- a surface e.g. the walls of a tunnel
- an object of the present invention is to overcome the aboyementioned problems by providing a method which supplies an injectable cement mixture into fine granular soils and porous or microf ractured rods or materials using commercially available cement, quickly and without waste.
- a further object of the present invention is to provide a plant for the production of said cement mixture which can be injected within a short time into fine-gram soils and rocks end/or porous or microf ractured materials.
- the present invention concerns a method for the production of mixtures of cement or similar hydraulic binders to be injected into fine-grain soils and into porous or microfractured rocks or materials, characterised in milling to a required granulometry an aqueous suspension having a ratio of cement versus water within the range from 0,25 to 2,5 by weight; and un adding to said suspension, before, during or after said milling step, at least one fluidifying additive.
- the present invention concerns a plant for the production of injectable mixture of cement or similar hydraulic binders, characterized in that it comprises a ball mill or similar milling means, for milling an aqueous suspension of commercially available cement; means, for adding to said suspension at least one fluidifying additive, before, during or after said milling step; and means for feeding said milling suspension to injection means.
- Fig 1 is a flow chart of a plant according to the invention:
- Fig 2 is a schematic diagram of a particular embodiment of a plant according to the invention, provided with a hydraulic particle separator/classifier;
- Fig 3 is a graph comparing the particle size range of a commercially available cement before and after milling according to the invention.
- Fig 4 is a graph of the parti cl e size range in a medium- fine sand.
- a cement mixture suitable to be injected into fine-grain soils and porous or microfractured materials and/or rocks in order to obtain consolidation thereof is prepared by reducing the particle size of the commercial cement, i.e. cement normally available on the market, to a sufficiently low value by milling to the required granulometry an aqueous suspension of said commercial cement having a ratio of cement versus water within the range from 0.25 to 2.5 by weight.
- the commercial cement i.e. cement normally available on the market
- a ratio of cement/water, by weight, of 2.5 resulted as the maximum ratio of a millable mixture, and mixtures having a cement/water ratio of less then 0.25 proved to be too diluted and brought to a self-grinding of the mill components.
- Mixtures having a high ratio of cement versus water, i.e. a C/W ratio higher than 0.5, are further diluted to the required concentration before the injecting step.
- At least one fluidifying additive i s added to the suspension in order to make the suspension injectable or, according to the preselected cement/water ratio, suitable to undergo the milling step too.
- suspensions with a cement/water ratio up to 1.0 (w/w) may be successfully milled without addition of fluidifving agents, suspensions having a higher ratio of cement vs water can be milled only if a suitable fluidifying additive is added to the mixture before or during the milling step, to avoid the mill blocking.
- Mixtures, having a ratio higher than 1.5 are preferably treated with said additives before the milling step.
- Said additives are preferably added to the cement mixture in an amount within the range from 0,5 to 7% by weight of the cement, according to the mixture characteristics and the particle average size.
- Any suitable agent can be used which will reduce flpeculation of the cement and involve "sol vatation" thereof by any extension of the setting time, allowing the separation of the fine from the coarse particles and the subsequent injection of tbe fines into the soil.
- such additives could be chosen from the following groups of compounds: polynaphthalensulphonic acid, pelyalkylsulphonic acid, polymethylmetacrvlic acid, polyphosphoric acid, their salts, such as sodium salts, melamine resins and mixtures thereof.
- a preferred additive is sodium polynaphtalensulphonate.
- the method of the invention is preferably carried out batchwise, by milling almost all the cement mixture that entered the mill to the desired granulometry and feeding it to the injection means. More preferably, a classification/separation step is carried out prior to the milling step to enhance the process efficiency.
- Fig 1 shows a flow chart of a possibie plant for the production of such injectable cement mixtures according to the method of the present invention.
- cement mixtures is meant here both a simple suspension of cement or any eimilar hydraulic binders in water, and a more complex mixture in which, besides the binder, further mineral fillers, e.g. silicates or carbonates, are present.
- the plant comprises a tank 1 or similar means for the preparation of a suspension of commercially available cement in water, preferably provided with a stirrer to keep the cement in suspension, connected by a feeder line 2 to classification/separation means 3.
- Two run-off lines 4 and 5 exit from said ciassification/separation means 3.
- Line 4 takes the fine particle fraction (i.e. that with fine grai size) to the injecting means (not shown).
- Line 5 takes the coarse particle fraction (i.e. that with coarse grain size) through suitable feeding means, e.g. a pump 6, to milling means 7.
- a line 8 is provided at the outlet of the milling means 7 to connect the same to the classification/separation means 3.
- the milling means 7 consists of a ball mill, with a plate agitator.
- An exit line 17 is connected with line 8 upstream a valve 19 to feed the milled mixture to the injecting means; a further valve 18 is provided to control with valve 19 the mixture flow through line 17 to the said injecting means.
- a valve 13 or similar controlling means is incorporated into the feeder line 2 at the outlet from tank 1, to regulate the flow of fresh mixture which enters the classifier/separator 3, and a similar valve 14 is located on the fine particle fraction outlet line 4.
- a suspension of commercially available cement in water is first prepared in tank 1. During this preparation or later in the course of feeding it through the feeder line 2 up to the classification/separation means 3, one or more deflocculant additives are added to the cement in water suspension to assist the following separation process into fine and coarse particle fractions and to extend the setting time of the cement.
- the fluidifying additive may be added also during or after the milling step, as above di scl osed .
- the fines mixture can be at least partially tapped and sent through line 4 to the injection means (not shown), while the coarse particle mixture is taken and fed through line 5 to the milling means 7.
- Means 6 are shown in fig 1 for circulating the mixture through the plant, e.g. i n the form of a pump.
- the coarse mixture entering the milling means 7 is milled along its path through said means 7; at the outlet there is a mixture whose percentage of fines depends on the size of the mill 7, the dwell time etc. Such a percentage is naturally the highest possible, but it is not necessary that all the coarse mixture is reduced to a fine particle mixture, in so far as the milled mixture leaving means 7 is recycled along the line 8 up to the classifier/separator 3, where it is once again separated and classified together with the commercial cement suspension entering from tank 1.
- valve means 13 and 14 on the lines 2 and 4 respectively. This allows a choice of either a batch or stepwise milling.
- the coarse particles are not immediately and completely milled as required and the milled mixture is sent to the classifier/separator 3 for further separation. In this way the particle size is progressively reduced until there are only fine particles.
- the preferred milling means for the continuous process is a ball mill, agitated by revolving plates, in which the mixture to be milled enters at the lower end and passes up tnrouqh the mill.
- the balls which fill ail the free spaces, grind the particles of cement which are carri ed along by the flow of suspension as obtained by the action of the feeding pump 6.
- the classification/separation means 3 could be any suitable device for the separation the fines from the coarses in suspensions; e.g. a hydrocycione or a centrifuge could be used.
- a hydraulic classifier/separator 9 is used, where an ascending current having a predetermined flow rate allows to separate the fine particles from the larger ones, by making the fine particles to raise up toward the upper part of the classifier/separator 3, while the coarse particles remain on the floor of the classifier/separator 9.
- the diagram of the plant is similar to that previously described with reference to Fig 1, and similar components have been re f erred to with the same reference numbers i n both figures.
- the classifier/separator of this plant consists of a cylindrical container or tank 9 where the suspension coming from tank 1 along line 2 and the mixture returning from mill 7 along line 8 are fed together along the common line 12 into the lower part of the classifier/separator 9, and create, due to the controlled feeding of the mixture from tank 1, an ascending current separating the fine particles by running the same toward the outlet line 4.
- the mixture portion in the lower part of the classifier/separator 9 is enriched of coarse particles; line 5 i s positioned to remove this larger particle fraction.
- Line 4, for tapping fine particles is positioned at a pre-selected higher level. corresponding to the suspension portion where fine particles only are present.
- classifier/separator is provided with slow stirrer means 10.
- a rising speed may be chosen such as not to raiss the coarse particles beyond a safety level, and in any case not to the tapping line 4.
- Fig 3 shows in a graph the distribution of particle sizes in a commercially available cement (Portland 525) (20) and in a mixture after milling according to the method of the invention (21), to be compared with the granulometry of the sample sand in fig. 4.
- a plant as. disclosed Fig 2 is comprising:
- microsphere and plate mill 7 having a volume of 0.50 litres.
- the suspension was fed from said tank 1 to the classifier/separator 9 along line 2 at a rate of 1.51/h.
- the fluid rising speed was of 1.67 cm/minute and 36 minutes after feeding began, the fine particle suspension started to flow through line 4.
- the level in tank 1 was continuously topped up with fresh mixture and the run-off of line 4 was collected in a suitable container under stirring.
- the average breaking load for the samples was 9.3 kg/cm 3 .
- a plant of the type disclosed in Fig 2 comprises:
- Said suspension was fed from said tank 1 along line 2 and the inner duct 12 to the classifier/separator 9 at a rate of 3.0 1/h.
- the stirrer 10 in the lower part of the classifier/separator 9, the pump 6 and mill 7 were switched on.
- the fluid rising speed was 1.67 cm/minute, and 60 minutes after feeding began the finished product started to flow through line 4.
- the level in tank 1 was continuously topped up with fresh- mixture and the run-off of line 4 wa ⁇ collected in a suitable container under stirring.
- microsphere and olate mill 7 having a volume of 0,50 litres
- Said suspension was fed from said tank 1 along line 2 and the inner pipe 12 up to the classifier/separator 9 at a rate of 3.00 1/h.
- the slow stirrer 10 in the lower part of the classifier/separator 9, the pump 6 and mill 7 were switched on.
- the mixture thus obtained was run off through the drain valve 15, and collected in a suitable container.
- a plant according to fig.2 embodiment comprises:
- microsprhere and plate mill 7 having a volume of 10 1.
- 250 1 of 525 ptl cement 66% suspension, with a ratio cement versus water C/W 2, are prepared in tank 1 and treated with sodium poiynaphtalenesuiphonate as previously disclosed. This mixture is fed to secondary tank 9 through line 2 and successively through line 5 and pump 6 to mill 7 at a flow rate of 60 1/h.
- Mill 7 is started. Because of the free inner volume of mill 7 and of the flow rate of pump 6, three minutes after the feeding began, the milled suspension began to flow from the mill exit. The valve 18 is open and valve 19 is ciosed to feed the mixture directly to the end use, where it may be used as such or diluted prior to its injection. In the meanwhile, fresh suspension is continuously fed to tank 3 and operation of the plant is continued. Globally, during the test which lasted 8 hours. 480 1 of suspension containing 534.13 kg of dry cement were fed to the plant.
- the average breaking load value was 580 kg/cm 2 for the mixture sample and 30.3 kg/cm 2 for the injected sand sample.
- Example 4 The plant was operated as disci osed in Example 4, and during the test, which lasted 8 hours, 480 1 of suspension containing 363.12 kg of cement were fed to the plant.
- the average breaking load value was 180 kg/cm 2 for the mixture samples and 27.3 kg/cm 2 for the i njected sand samples.
- the suspension is fed to the classifier 9 at a flow rate of 200 1/h.
- the stirrer 17, pump 6 and mill 7 are started.
- the level in tank 1 was continuously topped up with fresh mixture and tha fractions flowing at 4 were collected.
- mixtures obtained according to the invention are injectable in a sample of compacted and pressed sand, having the granulometry shown in fig. 4, at very low pressures, namely at 1,5 atm or less (e.g. 0.5 atm).
- the cited sand granulometry is characterizable as follows: max. diameter 0. 5 mm
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Food Science & Technology (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Disintegrating Or Milling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8920581A IT1230847B (en) | 1989-05-22 | 1989-05-22 | PROCEDURE AND PLANT FOR THE PRODUCTION OF INJECTABLE CEMENT MIXTURES. |
IT20581A/89 | 1989-05-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990014322A1 true WO1990014322A1 (en) | 1990-11-29 |
Family
ID=11169120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1990/000810 WO1990014322A1 (en) | 1989-05-22 | 1990-05-18 | Method and plant for the production of injectable cement mixtures |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0473628A1 (en) |
JP (1) | JPH04505442A (en) |
IT (1) | IT1230847B (en) |
WO (1) | WO1990014322A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0412913B1 (en) * | 1989-08-11 | 1995-11-08 | Lafarge Nouveaux Materiaux | Injection grout for consolidating cracked structures |
WO2001062458A1 (en) * | 2000-02-24 | 2001-08-30 | Alessandro Quadrio Curzio | Process to prepare cement mixes |
WO2009030758A1 (en) * | 2007-09-05 | 2009-03-12 | Epg (Engineered Nanoproducts Germany) Ag | Hyper-fine cement |
CN113426548A (en) * | 2021-06-28 | 2021-09-24 | 中国水利水电第九工程局有限公司 | Control method for wet screening and dry crushing process of fine crushing workshop in machine-made gravel |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109290040B (en) * | 2017-07-24 | 2021-05-11 | 河北建材职业技术学院 | Automatic grinding aid mixing amount control device for ball mill |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2019454A (en) * | 1931-11-23 | 1935-10-29 | Smidth & Co As F L | Grinding mill |
GB494856A (en) * | 1936-07-30 | 1938-11-02 | Harry Ridley | Improved sprayable cement mortar |
GB573663A (en) * | 1943-05-28 | 1945-11-30 | Cementation Co Ltd | Improvements in or relating to the injection of grout into cavities |
FR1294544A (en) * | 1960-07-26 | 1962-05-26 | Improvement in the preparation of cement mortars or concrete | |
US3301495A (en) * | 1963-05-22 | 1967-01-31 | Sid H Eliason | Ball mill for forming liquid suspensions of finely divided solid material |
US3398902A (en) * | 1965-12-02 | 1968-08-27 | Khomeriki Grigory Petrovich | Electromagnetic ball mill |
US3720379A (en) * | 1964-10-30 | 1973-03-13 | A Szegvari | Treatment of dispersions |
US4444945A (en) * | 1983-02-15 | 1984-04-24 | Monsanto Company | Low-salt containing aqueous solutions of melamine-formaldehyde resin |
US4447266A (en) * | 1982-09-07 | 1984-05-08 | Diamond Shamrock Chemicals Company | Cementitious composition |
US4704415A (en) * | 1986-06-13 | 1987-11-03 | The Dow Chemical Company | High efficiency superplasticizer comprising a sulfonated copolymer of styrene and alpha-mestyrene for cement compositions |
EP0247895A2 (en) * | 1986-05-30 | 1987-12-02 | Stemcor Corporation | Autogenous attrition grinding |
EP0267170A1 (en) * | 1986-10-06 | 1988-05-11 | Lars Jörgen Lidström | Treatment of middlings |
US4792360A (en) * | 1987-06-30 | 1988-12-20 | The Dow Chemical Company | Workable cement composition of low water content containing a hydroxyalkyl (meth)acrylate polymer |
-
1989
- 1989-05-22 IT IT8920581A patent/IT1230847B/en active
-
1990
- 1990-05-18 WO PCT/EP1990/000810 patent/WO1990014322A1/en not_active Application Discontinuation
- 1990-05-18 EP EP90907042A patent/EP0473628A1/en not_active Ceased
- 1990-05-18 JP JP2507364A patent/JPH04505442A/en active Pending
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2019454A (en) * | 1931-11-23 | 1935-10-29 | Smidth & Co As F L | Grinding mill |
GB494856A (en) * | 1936-07-30 | 1938-11-02 | Harry Ridley | Improved sprayable cement mortar |
GB573663A (en) * | 1943-05-28 | 1945-11-30 | Cementation Co Ltd | Improvements in or relating to the injection of grout into cavities |
FR1294544A (en) * | 1960-07-26 | 1962-05-26 | Improvement in the preparation of cement mortars or concrete | |
US3301495A (en) * | 1963-05-22 | 1967-01-31 | Sid H Eliason | Ball mill for forming liquid suspensions of finely divided solid material |
US3720379A (en) * | 1964-10-30 | 1973-03-13 | A Szegvari | Treatment of dispersions |
US3398902A (en) * | 1965-12-02 | 1968-08-27 | Khomeriki Grigory Petrovich | Electromagnetic ball mill |
US4447266A (en) * | 1982-09-07 | 1984-05-08 | Diamond Shamrock Chemicals Company | Cementitious composition |
US4444945A (en) * | 1983-02-15 | 1984-04-24 | Monsanto Company | Low-salt containing aqueous solutions of melamine-formaldehyde resin |
EP0247895A2 (en) * | 1986-05-30 | 1987-12-02 | Stemcor Corporation | Autogenous attrition grinding |
US4704415A (en) * | 1986-06-13 | 1987-11-03 | The Dow Chemical Company | High efficiency superplasticizer comprising a sulfonated copolymer of styrene and alpha-mestyrene for cement compositions |
EP0267170A1 (en) * | 1986-10-06 | 1988-05-11 | Lars Jörgen Lidström | Treatment of middlings |
US4792360A (en) * | 1987-06-30 | 1988-12-20 | The Dow Chemical Company | Workable cement composition of low water content containing a hydroxyalkyl (meth)acrylate polymer |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0412913B1 (en) * | 1989-08-11 | 1995-11-08 | Lafarge Nouveaux Materiaux | Injection grout for consolidating cracked structures |
WO2001062458A1 (en) * | 2000-02-24 | 2001-08-30 | Alessandro Quadrio Curzio | Process to prepare cement mixes |
WO2009030758A1 (en) * | 2007-09-05 | 2009-03-12 | Epg (Engineered Nanoproducts Germany) Ag | Hyper-fine cement |
US8226879B2 (en) | 2007-09-05 | 2012-07-24 | Epg (Engineered Nanoproducts Germany) Ag | Hyper-fine cement |
EP2508495A1 (en) * | 2007-09-05 | 2012-10-10 | EPG (Engineered nanoProducts Germany) AG | Method for sealing or fixing porous bodies, stones or porous formations with extremely fine cement |
CN113426548A (en) * | 2021-06-28 | 2021-09-24 | 中国水利水电第九工程局有限公司 | Control method for wet screening and dry crushing process of fine crushing workshop in machine-made gravel |
CN113426548B (en) * | 2021-06-28 | 2022-06-17 | 中国水利水电第九工程局有限公司 | Control method for wet screening and dry crushing process of fine crushing workshop in machine-made gravel |
Also Published As
Publication number | Publication date |
---|---|
IT8920581A0 (en) | 1989-05-22 |
EP0473628A1 (en) | 1992-03-11 |
IT1230847B (en) | 1991-11-08 |
JPH04505442A (en) | 1992-09-24 |
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