WO1995015839A1 - Procede et dispositif pour l'incorporation dans les matieres premieres d'un beton d'un melange additionnel tout-venant - Google Patents
Procede et dispositif pour l'incorporation dans les matieres premieres d'un beton d'un melange additionnel tout-venant Download PDFInfo
- Publication number
- WO1995015839A1 WO1995015839A1 PCT/FR1994/001418 FR9401418W WO9515839A1 WO 1995015839 A1 WO1995015839 A1 WO 1995015839A1 FR 9401418 W FR9401418 W FR 9401418W WO 9515839 A1 WO9515839 A1 WO 9515839A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mixture
- additional
- water
- mixer
- concrete
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/02—Conditioning the material prior to shaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/0404—Proportioning
- B28C7/0409—Proportioning taking regard of the moisture content of the solid ingredients; Moisture indicators
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
-
- 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
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0032—Controlling the process of mixing, e.g. adding ingredients in a quantity depending on a measured or desired value
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Definitions
- the present invention relates to a method and a device for incorporating into the raw materials of a concrete, the water content of the final mixture of which must be controlled, of an additional mixture containing wet ashes.
- Concrete is an artificial product created by the assembly of different constituents: aggregates (sand and gravel), a binder, generally cement, which is itself hydrated with water.
- aggregates sand and gravel
- a binder generally cement
- various additives are added to the concrete before or during its production.
- these additives are the silico-aluminous ash, which results from the combustion of coal, used as an energy source, in certain thermal power stations.
- fly ash have a pozzolanic character, that is to say that they can fix lime, and then develop in the presence of water binder hydrates of the same type as cement.
- fly ash has several advantages for concrete, including:
- fly ash is available on the market in wet or dry version.
- these are delivered by trucks, stored in silos and used in the same way as cement.
- these dry ashes lose much of their interest.
- wet ashes are generally stored in heaps, in the form of slag heaps, in the open air, and are in the form of a dark colored wet earth whose price is low but whose use is problematic because of the maneuverability of the product.
- pozzolan is a homogeneous material that can be stored in a silo, which is not the case for wet ashes which cannot be stored in silos and which cannot be handled using conventional handling equipment due of their presentation in the form of a fatty and compact material.
- the purpose of the method of incorporating the present invention and of the installation allowing its implementation is to allow the use for the manufacture of said concrete of wet ash stored in the open air, generally in the form of a heap, without reducing the throughput of the power plant while obtaining a final mixture whose water content is perfectly controlled and whose qualitative characteristics remain unchanged or even increased.
- Another object of the invention is to provide an installation for incorporating an inexpensive additional mixture capable of adapting to any configuration of concrete plant.
- the invention relates to a process for incorporating into the raw materials of a concrete, an additional mixture based on wet ash stored in a heap in the open air, characterized in that one works mechanically on the surface the pile of wet ashes to detach constituent elements of the additional mixture, in that one transforms mechanically, without addition of water, said additional mixture into a homogeneous mixture, in that one measures with each incorporation weight and the water content of said additional mixture, and the quantity of complementary water necessary to obtain a final predetermined water content of said final mixture is injected.
- said additional mixture mechanically separated from the heap is subjected to a sorting operation such as a screening so as to remove particles with a particle size greater than a predetermined particle size, we emote said additional mixture thus calibrated, we measure the water content and we weigh said mixture, we send said additional mixture directly to a mixer of a concrete plant and we add in this mixer said amount of additional water .
- a sorting operation such as a screening so as to remove particles with a particle size greater than a predetermined particle size
- said additional weighed and controlled water content mixture is sent to an intermediate mixer of a concrete plant, part of said quantity of is added to this intermediate mixer additional water, the mixture thus formed is sent to the mixer of the concrete plant and the additional amount of said additional water is added to said mixer.
- the elements of the additional mixture once prepared in the form of an emulsion, do not have time to separate and redeposit as is the case when extracting the mixture from a huge tank permanent agitation where the mixture is prefabricated in advance. It was found that the strength gains of the final mixture, thanks to this particular implementation, vary between 2 and 4 Mpa.
- the invention also relates to an installation arranged upstream of the mixer of a concrete plant, and allowing 1'incorporation in the raw materials of concrete, the water content of the final mixture must be controlled, a additional mixture essentially based on wet ash stored in a pile in the open air, characterized in that it comprises means for working on the surface of the pile of ash to detach the elements from it constituting the additional mixture, mechanical means for dry processing the additional mixture into a homogeneous mixture, means for measuring the weight and the water content of said additional mixture to be incorporated in the mixer of the plant, means for incorporation of said additional mixture, means for injecting the additional quantity of water necessary to obtain a final predetermined water content of said final mixture and means for controlling or actuating these said injection means.
- FIG. 1 represents a block diagram of the whole of the installation arranged upstream of the mixer of the concrete plant
- FIG. 1 The installation of FIG. 1 of the removal of ashes until the weighing of said ashes;
- FIG. 3 represents a detailed view of the second part of the installation for weighing the ashes until they are incorporated into the mixer;
- FIG. 4 represents a front view of the scraping arm
- FIG. 5 represents a view of the rear of the scraping arm
- FIG. 6 represents a view along A of the figure
- the object of the process is the incorporation of wet ashes in the form of a pile 1 in a mixer M of a concrete plant.
- These ashes can come from various installations 33 such as thermal power stations, power stations, etc.
- These ashes constitute the additional mixture.
- Concrete is made from a mixture of raw materials including, for example, gravel, sand, a hydraulic binder based on cement or lime and water.
- the raw materials constituting the concrete are introduced into the mixer M.
- To this mixture is added a quantity of wet ashes 1.
- the raw materials-ashes assembly completed with a variable quantity of water constitutes the final mixture.
- These wet ashes play the role of fines and their function is to promote the bond of the aggregates between them and to fill the existing interstices.
- wet ash 1 is carried out discontinuously in the concrete mixer M and requires measuring each time it is incorporated into said mixer the weight and the water content of said additional mixture in order to be able to inject the necessary quantity of additional water. to obtain a predetermined final water content of said final mixture. Such measurements can only be made if the additional mixture is a homogeneous mixture. This is the purpose of the installation shown upstream of the mixer M.
- the installation therefore comprises means for taking the additional mixture to the heap, means for processing the additional mixture, means for measuring the weight and the content of water from said additional mixture, means for incorporating this mixture into the mixer M of the concrete plant and means for injecting the quantity of additional water necessary to obtain a predetermined final water content of said final mixture, these means of injection being equipped with actuating means which allow regulation of the quantity of water injected.
- the ashes to be incorporated into the mixer M are stored in the form of a pile 1.
- the supply of these ashes 1 to mixer M and the incorporation of these ashes into said mixer takes place discontinuously.
- the ashes 1 must first of all be removed from the pile 1.
- the device selected to allow this operation to be carried out therefore comprises, on the one hand, means for working on the surface of the pile to detach the elements constituting the mixture and means for evacuating elements detached from the pile constituting the additional mixture. These means are shown in Figures 4 and 5.
- the recovery in the pile 1 is effected by 1'intermediate at least two harrows 34 arranged substantially horizontally and rotatably mounted inside a frame 35. These harrows 34 make it possible to attack the pile 1 on the surface by destroying the crust formed and gradually detaching the elements from the pile 1.
- rotary harrows 34 all rotating at the same speed however have a variable speed of rotation depending on the nature, in particular the water content of ash pile 1. So that these harrows 34 are kept in permanent contact with the pile 1 during the reduction of this pile, the frame 35, support of these rotary harrows 34, is articulated on a frame 36. Therefore, the frame 35 can be separated more or less from the chassis 36 by an angle ⁇ shown in Figure 6 by pivoting about a horizontal axis disposed in the lower part of the chassis 36. Thanks to this articulation of the frame 35 on the chassis 36 which allows angular displacement of the frame 35 relative to the frame 36, the harrows 34 adapt to any type of heap 1 regardless of the shape and height of this heap 1.
- this displacement of the frame 35 relative to the frame 36 can be controlled by at least one cylinder 37.
- a scraping arm 2 known per se is used.
- This scraper arm 2 shown in FIG. 4, is a self-propelled machine essentially constituted by an endless chain 39 with scraper cups 2A. These buckets 2A scrape on the ground the wet ashes which have been detached from the pile 1 to bring them into a feed chute 3 which evacuates these ashes to the device for mechanical processing by dry ashes.
- This scraping arm 2 is available radiating around an axis (XX ') and is in a known manner articulated 38 around this vertical axis (XX') forming a pivot so as to be able to position itself optimally at the base of the pile 1 of ashes .
- This scraper arm 2 and the surface treatment device 34, 35, 36 of the pile 1 are interconnected to safely allow correct positioning of the scraper buckets 2A relative to the harrows 34.
- the whole of this device is adaptable to any configuration.
- the mixture becomes maneuverable in the hopper.
- the wet ashes are brought by the feed chute 3 to a device for the mechanical treatment of the ashes by dry process to make this additional mixture of ashes homogeneous and therefore usable in any concrete batching plant unit.
- This ash treatment device comprises, in the example shown in FIG. 1, a vibrating screen 4 ensuring the removal of the materials contained in the additional mixture having a particle size greater than a predetermined particle size.
- a refusal chute 5 connected to this vibrating screen 4 allows the elimination of material of too large particle size.
- the mixture thus calibrated is recovered in an intermediate hopper 8 and enters a decompaction device 6 or crumbling.
- this decompaction device 6 can consist of two parallel shafts fitted with squares forming combs whose teeth interpenetrate during the rotation of said shafts so as to remove the existing clods.
- the mixture thus calibrated and unpacked or lumped is recovered in a buffer hopper 9.
- this hopper 9 the water content of the additional mixture is measured by means of measuring devices such as probes 7 and 10.
- the content of this hopper 9 is subsequently brought by means of a conveyor belt 11 into a skip 13 disposed on a weighing frame 12.
- This weighing frame can, for example, constitute a means of weighing the additional mixture. Therefore, at the end of this step, we know on the one hand the water content of said additional mixture, on the other hand its weight without ever having added water to treat said ash. It then becomes easy to determine the amount of water to be injected into the mixture.
- Figure 2 shows the detail of the steps described above.
- the skip 13 containing the additional mixture is brought via a vertical elevator 14 actuated by means of a geared motor 16 in the vicinity of the mixer M.
- Vertical rails 15 constitute guide members of this skip 13.
- the content of the skip is poured into a chute 17.
- the outlet of this chute is equipped with a bypass 19 controlled by means of a shutter member 18 so as to allow either direct introduction by a conduit 20 additional mixture in the mixer M of the concrete batching plant, either an indirect incorporation by means of an intermediate device 21 called an intermediate mixer or a device for deflocculating the mixture of ash.
- these means for incorporating the additional mixture into the mixer M may consist solely of this pipe 20 directly connecting the chute 17 and the mixer M and / or an intermediate device 21.
- the additional mixture will first be treated inside the deflocculation device or intermediate mixer 21 so as to allow the production of a homogeneous mixture in the form of a grout or a mud. Subsequently, this grout or this mud will be introduced by means of a hopper 27 connected to a chute 28 inside the mixer M.
- the means for injecting the quantity of additional water necessary to obtain a predetermined water content of said final mixture inside the mixer M connected to the mixer of the concrete plant can also be connected to the intermediate device 21 to add to this device 21 a part of said amount of additional water.
- the means 22, 23, 24 and 25 for injecting a variable quantity of water into the device 21 and / or into the mixer M consist of pipes fitted with valves with adjustable closure. The adjustment of these means for closing said valves to allow control of the quantity injected can be controlled manually or automatically by means of the flow meter 22.
- the valves combined with the flow meter constitute the means of actuating the injection means. This command is carried out with regard to the results of the measurements carried out by means of the probes 7, 10 and the weighing frame 12.
- the quantity of water injected is directly linked to the water content of the additional mixture and to the quantity of ashes to be incorporated.
- the control of these injection means can be carried out by means of a treatment unit 29, 30, 31, 32 connected to the measuring device, said treatment unit including means for calculating the quantity of additional water to be injected.
- This processing unit is conventionally made up of a computer, an appropriate program and possibly display means such as a printer.
- the processing unit determines the quantity of water to be injected directly into the mixer M and possibly into the intermediate device 21 according to l 'option chosen.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Dispersion Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95902835A EP0732985A1 (fr) | 1993-12-07 | 1994-12-06 | Procede et dispositif pour l'incorporation dans les matieres premieres d'un beton d'un melange additionnel tout-venant |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9314660A FR2713537B1 (fr) | 1993-12-07 | 1993-12-07 | Procédé et dispositif pour l'incorporation dans les matières premières d'un béton d'un mélange additionnel tout-venant. |
FR93/14660 | 1993-12-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995015839A1 true WO1995015839A1 (fr) | 1995-06-15 |
Family
ID=9453645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1994/001418 WO1995015839A1 (fr) | 1993-12-07 | 1994-12-06 | Procede et dispositif pour l'incorporation dans les matieres premieres d'un beton d'un melange additionnel tout-venant |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0732985A1 (fr) |
FR (1) | FR2713537B1 (fr) |
WO (1) | WO1995015839A1 (fr) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1485028A (fr) * | 1966-06-28 | 1967-06-16 | Ammann U Maschf Ag | Procédé et dispositif pour fabriquer par charges du béton frais |
JPS58167327A (ja) * | 1982-03-26 | 1983-10-03 | Hitachi Ltd | ばら物状貯蔵物の払出装置 |
FR2633921A1 (fr) * | 1988-07-11 | 1990-01-12 | Couturier Jean | Procede de traitement des cendres en terrils pour la fabrication du beton |
WO1992003388A1 (fr) * | 1990-08-23 | 1992-03-05 | Electricite De France | Procede et dispositif pour la reprise des stocks des cendres volantes de charbon |
DE4108366A1 (de) * | 1991-03-15 | 1992-09-17 | Fonderie Cooperative Di Modena | Verfahren zum herstellen von erzeugnissen fuer die bauindustrie und anlage zur durchfuehrung des verfahrens |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2258253B1 (fr) * | 1974-01-21 | 1978-03-17 | Lerebourg Michel | |
US4121945A (en) * | 1976-04-16 | 1978-10-24 | Amax Resource Recovery Systems, Inc. | Fly ash benificiation process |
DE3126889A1 (de) * | 1981-07-08 | 1983-01-27 | Rainer 7560 Gaggenau Bottke | Beton mit einer gegenueber der aus dem wasser-zementwert-gesetz ableitbaren endfestigkeit erhoehten endfestigkeit |
FR2659594B1 (fr) * | 1990-03-15 | 1992-07-24 | Lemasson Paul | Procede de realisation d'un element a partir d'un melange de pouzzolane et de ciment, l'installation de mise en óoeuvre et les produits obtenus. |
FR2666576B1 (fr) * | 1990-09-11 | 1993-04-02 | Armines | Procede pour ameliorer les performances et la durabilite des betons. |
-
1993
- 1993-12-07 FR FR9314660A patent/FR2713537B1/fr not_active Expired - Fee Related
-
1994
- 1994-12-06 WO PCT/FR1994/001418 patent/WO1995015839A1/fr not_active Application Discontinuation
- 1994-12-06 EP EP95902835A patent/EP0732985A1/fr not_active Ceased
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1485028A (fr) * | 1966-06-28 | 1967-06-16 | Ammann U Maschf Ag | Procédé et dispositif pour fabriquer par charges du béton frais |
JPS58167327A (ja) * | 1982-03-26 | 1983-10-03 | Hitachi Ltd | ばら物状貯蔵物の払出装置 |
FR2633921A1 (fr) * | 1988-07-11 | 1990-01-12 | Couturier Jean | Procede de traitement des cendres en terrils pour la fabrication du beton |
WO1992003388A1 (fr) * | 1990-08-23 | 1992-03-05 | Electricite De France | Procede et dispositif pour la reprise des stocks des cendres volantes de charbon |
DE4108366A1 (de) * | 1991-03-15 | 1992-09-17 | Fonderie Cooperative Di Modena | Verfahren zum herstellen von erzeugnissen fuer die bauindustrie und anlage zur durchfuehrung des verfahrens |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 8, no. 5 (M - 267) 11 January 1984 (1984-01-11) * |
Also Published As
Publication number | Publication date |
---|---|
FR2713537B1 (fr) | 1996-01-05 |
FR2713537A1 (fr) | 1995-06-16 |
EP0732985A1 (fr) | 1996-09-25 |
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