EP0768113B1 - Process for manufacturing fine cement/ultrafine binder suspensions - Google Patents

Process for manufacturing fine cement/ultrafine binder suspensions Download PDF

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Publication number
EP0768113B1
EP0768113B1 EP96114901A EP96114901A EP0768113B1 EP 0768113 B1 EP0768113 B1 EP 0768113B1 EP 96114901 A EP96114901 A EP 96114901A EP 96114901 A EP96114901 A EP 96114901A EP 0768113 B1 EP0768113 B1 EP 0768113B1
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EP
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Prior art keywords
ultrafine
storage tank
cement
mixer
pump
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EP96114901A
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German (de)
French (fr)
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EP0768113A1 (en
Inventor
Theodor Günther
Wolfgang Dr. Perbix
Günther Schneider
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Dyckerhoff GmbH
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Dyckerhoff GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/02—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions without using driven mechanical means effecting the mixing
    • B28C5/04—Gravitational mixing; Mixing by intermingling streams of ingredients
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3121—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • B01F25/53—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is discharged from and reintroduced into a receptacle through a recirculation tube, into which an additional component is introduced
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F35/92—Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing

Definitions

  • Fine cements / fine binders are increasingly used in the fields Concrete repair and geotechnical engineering used. Serve those made from the finest cements / finest binders Cement suspensions for filling cracks in concrete, cracks and Fissures in rock and pore spaces in loose rock.
  • Fine cements are very fine-grained hydraulic binders steady and closely graded grain distributions and a limitation of the largest grain.
  • the properties and use of fine cements is regulated, e.g. in a preliminary leaflet for Pressing in with fine binders in loose rock (construction technology 70, [1993], Issue 9, Ernst & Sohn, pages 550 to 560, and ZTV-RISS 93, Verlidblatt document B 5237, fixtureblatt-Verlag).
  • the terminology in the two known sets of rules is not uniformly.
  • the term "ultra-fine binder” is used in the leaflet and in the ZTV-RISS the term "fine cement” is used.
  • the American literature speaks of microfine Portland cement (U.S. Patent 5,106,423).
  • the fine cement should be used Manufacture of cement suspensions with a sieve of ⁇ 95 % with a mesh size of 16 ⁇ m (0.016 mm) and with suitable additives and additives.
  • the Terms and content of the ingredients additives and Additives are in cement leaflet No. B 3, BBD / KA 1.93 / 20 Are defined.
  • EP 0 498 279 describes a device for processing and Pressing a cement suspension known to a preparation area and has a pressing area.
  • the processing area and the pressing area are with a connecting line connected to each other and they each have a container a circuit line and a pump with which the cement suspension is circulated for preparation or grouting can be.
  • This document teaches that in the circulation line a strainer is inserted in the processing area and the containers are each filled with a coolant Cooling device are surrounded. A lump should pass through the sieve can be prevented because the suspension with a relatively high Pressure is pressed through the sieve, being in suspension Lumps are cut up.
  • the device for carrying out the mixing process has one Weighing and mixing container on, of which in the weighing and mixing container liquid in a centrifugal pump can be pumped in a first circuit.
  • a second circuit in which a venturi mixing nozzle is arranged.
  • the second circuit opened and this premixing through a Venturi mixing nozzle guided.
  • a venturi mixing nozzle By means of this venturi mixing nozzle now a dry component is added to the premix and again pumped into the mixing tank. If a desired amount of solid has been supplied in this way, the venturi mixing nozzle circuit closed again and the mixture for further Homogenization returned to the first mixing cycle. Finally, a valve in the first mixing circuit is opened and the content of the mixing tank by means of the centrifugal pump in pumped a reservoir.
  • the invention has for its object a method for the production of fine cement-hydraulic fine binder suspensions with a sieve size greater than or equal to 95% at one Specify a mesh size of 16 ⁇ m, with no clumping of the material to be processed Materials like when using high or low speed Mixer occurs and for fine cement fine binder Commonly used dry powder additives are optimally open-minded, therefore a total lump-free suspension is obtained.
  • the subject of the invention is therefore a process for the preparation of fine cement hydraulic fine binder suspensions, in which in a closed circuit first in a storage container 1 a quantity of water corresponding to a given recipe submitted and via a pump 2 to a venturi principle working mixer 3, such as a water jet pump, pumped is, the water flowing through the mixer 3 generated negative pressure the fine cement the fine binder from a Mixer 3 arranged container 4 to form a suspension-like Mixes sucked in and this suspension to the reservoir 1 transported, with a stirring device 5 is stirred, and then the suspension by means of the pump 2 returned to the circuit at least once and after Completion of a specified preparation at an acceptance point 6 is removed from the circuit.
  • a venturi principle working mixer 3 such as a water jet pump
  • Another object of the invention is the use of a device for Carrying out the above-mentioned procedure comprehensively a storage container 1 for water, optionally additives for the ultra-fine cement, the ultra-fine binder a transport line 7a from Storage container 1 to a downstream of the storage container 1 Pump 2, another transport line 7b from pump 2 to a mixer 3 operating according to the Venturi principle, such as one Water jet pump on which a container 4 for the addition of the Feinstzements / Feinstbindeffens is provided, a further transport line 7c of the mixer 3 to the reservoir 1, and by one with the Pump 2 connected via a transport line 7d Tapping point 6, the arrangement of storage container 1, Pump 2 and mixer 3 is such that these via the transport lines 7 are cyclically connected in series.
  • the device shown in FIG. 1 for producing the fine cement / fine binder suspensions comprises a storage container 1 provided with an agitator 5, which can be charged with water and optionally with additives and / or additives customary for the fine cement.
  • Transport lines 7a and 7b lead from the storage container 1 to the pump 2 and further to a mixer 3 which works according to the Venturi principle, such as a water jet pump, which is equipped with a container 4, via which the fine cement / fine binder is added. Due to the negative pressure generated in the mixer 3, the ultrafine cement / ultrafine binder is sucked out of the container 4 into the water flowing through the mixer 3 to form a suspension-like mixture and is transported again to the storage container 1 via the transport line 7c.
  • the suspension can now be pumped from the storage container 1 again at least once to the mixer 3 by means of the pump 2 and mixed with further fine cement / ultra-fine binder and is then pumped back again to the storage container 1, this process also being repeatable until a desired water: cement Ratio is set and the additives in the suspension are optimally distributed and digested.
  • Fine cement / fine binder suspension for example at Filling cracks or crevices and fissures in the rock is according to an advantageous embodiment depending on the outside temperature of the storage container (1) by means of a heating or Cooling device can be heated or cooled, so that the fine cement / fine binder suspension to an exact optimal Temperature range is adjustable.
  • the storage container 1 for example at high Summer temperatures can be cooled or heated, though the suspension is processed in the cool rock to ensure optimal Ensure solidification in the rock.
  • the device makes it possible to be robust, extremely easy to handle simple and inexpensive mixing units for site-specific Provide application without relying on the high mixing Requirements for fine cement suspensions and fine binders to renounce.

Abstract

Fine cement/fine binding agent suspensions are mfd. e.g. for filling cracks in cement by a method in which a quantity of water corresp. to a predetermined recipe is put in a storage container (1), from which it is pumped by a pump (2) to a mixer (3) operating according to the Venturi principle. The low pressure generated by the water flowing through the mixer draws fine cement/fine binding agent from a container (4) in to the flow to form a suspension, which passes to the storage container for recycling through the circuit, after stirring (5), at least once. When the required mixture has been produced, it is discharged (6). The storage container is equipped with heating or cooling device to maintain constant temp.

Description

Feinstzemente/Feinstbindemittel werden zunehmend in den Bereichen Betoninstandsetzung und Geotechnik eingesetzt. Dabei dienen die aus den Feinstzementen/Feinstbindemitteln hergestellten Zementsuspensionen zum Füllen von Rissen in Beton, Spalten und Klüften in Fels sowie Porenräumen in Lockergesteinen.Fine cements / fine binders are increasingly used in the fields Concrete repair and geotechnical engineering used. Serve those made from the finest cements / finest binders Cement suspensions for filling cracks in concrete, cracks and Fissures in rock and pore spaces in loose rock.

Feinstzemente sind sehr feinkörnige hydraulische Bindemittel mit stetig und eng abgestuften Kornverteilungen und einer Begrenzung des Größtkorns. Die Eigenschaften und die Verwendung von Feinstzementen ist geregelt, z.B. in einem vorläufigen Merkblatt für Einpressarbeiten mit Feinstbindemitteln in Lockergesteinen (Bautechnik 70, [1993], Heft 9, Ernst & Sohn, Seiten 550 bis 560, und ZTV-RISS 93, Verkehrblatt-Dokument B 5237, Verkehrsblatt-Verlag). Die Terminologie in den beiden bekannten Regelwerken ist nicht einheitlich. Im Merkblatt wird der Begriff "Feinstbindemittel" und in der ZTV-RISS der Begriff "Feinzement" verwendet. Die amerikanische Literatur spricht von mikrofeinen Portlandzementen (US-PS 5 106 423). Im folgenden wird hauptsächlich der Begriff "Feinstzement" verwendet, der auch in einschlägigen Fachberichten verwendet wird (Beton 1/94, Seiten 12 bis 16, Felsbau 11, [1993], Nummer 6, Sonderabdruck, Bauingenieur 67, [1992], Seiten 499 bis 504).Fine cements are very fine-grained hydraulic binders steady and closely graded grain distributions and a limitation of the largest grain. The properties and use of fine cements is regulated, e.g. in a preliminary leaflet for Pressing in with fine binders in loose rock (construction technology 70, [1993], Issue 9, Ernst & Sohn, pages 550 to 560, and ZTV-RISS 93, Verkehrblatt document B 5237, Verkehrsblatt-Verlag). The terminology in the two known sets of rules is not uniformly. The term "ultra-fine binder" is used in the leaflet and in the ZTV-RISS the term "fine cement" is used. The American literature speaks of microfine Portland cement (U.S. Patent 5,106,423). The following is mainly the term "Fine cement" used, which is also in relevant technical reports is used (concrete 1/94, pages 12 to 16, Felsbau 11, [1993], number 6, special print, civil engineer 67, [1992], pages 499 to 504).

Nach den Vorschriften der Regelwerke soll der Feinstzement zur Herstellung von Zementsuspensionen einen Siebdurchgang von ≥ 95 % bei einer Maschenweite von 16 µm (0,016 mm) haben und mit geeigneten Zusatzstoffen und Zusatzmitteln hergestellt sein. Die Begriffe und Begriffsinhalte der Bestandteile Zusatzstoffe und Zusatzmittel sind im Zement-Merkblatt Nr. B 3, BBD/KA 1.93/20 definiert.According to the regulations, the fine cement should be used Manufacture of cement suspensions with a sieve of ≥ 95 % with a mesh size of 16 µm (0.016 mm) and with suitable additives and additives. The Terms and content of the ingredients additives and Additives are in cement leaflet No. B 3, BBD / KA 1.93 / 20 Are defined.

Die besondere Eignung von Feinstzementen/Feinstbindemitteln für die genannten Maßnahmen ist auf die hohe Feinheit bei gleichzeitig begrenztem Größtkorn der trockenen Bindemittel zurückzuführen. Maßgebend für die Eignung von Feinstzementen/Feinstbindemitteln ist jedoch darüberhinaus die Kornverteilung des Bindemittels in der Suspension. So können bei unzureichendem Aufschluß des Feinstzementes in Wasser Agglomerate entstehen bzw. verbleiben, die beispielsweise eine Injektion von Feinstzementsuspensionen in feinste Betonrisse ausschließt.The special suitability of ultra-fine cements / ultra-fine binders for the measures mentioned is due to the high fineness at the same time limited largest grain of dry binders. Decisive for the suitability of ultra-fine cements / ultra-fine binders is, however, the particle size distribution of the binder in suspension. So with insufficient digestion of fine cement in water agglomerates are formed or remain, for example an injection of fine cement suspensions in the finest concrete cracks.

Auf die Notwendigkeit des ausreichenden Aufschließens von Feinstzementen/Feinstbindemitteln bei der Herstellung von Suspensionen wird in den einschlägigen Regelwerken (ZTV-RISS, Merkblatt Feinstbindemittel) ausdrücklich hingewiesen. Gemäß der Ausführungen im Feinstbindemittel-Merkblatt sind für einen optimalen Aufschluß der Feinstbindemittel ausschließlich Turbomischer oder andere Mischer mit hoher Intensität zu verwenden, da insbesondere bei der Mischtechnik höhere Anforderungen zu stellen sind. Als geeignete Geräte werden explizit angegeben: Turbomischer, Kreiselpumpen, Wirbelradpumpen.The need to sufficiently unlock Ultra-fine cements / ultra-fine binders in the manufacture of suspensions is in the relevant regulations (ZTV-RISS, leaflet Ultra-fine binders). According to the Versions in the fine binder data sheet are for an optimal Digestion of the ultra-fine binders only turbo mixers or use other high intensity mixers because to make higher demands, particularly in mixing technology are. The following are explicitly stated as suitable devices: turbo mixer, Centrifugal pumps, vortex pumps.

Aus einer Wiley-Interscience Publication "Construction and Design of Cement Grouting" ist es bekannt, einen nach dem Venturi-Prinzip arbeitenden Mischer zu verwenden, wobei der Zement in das Vakuum eingesaugt und anschließend mit dem Wasserstrahl vermischt wird. Hierbei wird jedoch angegeben, daß kein gutes Mischen erfolgt und die Steuerung des Verhältnisses Wasser:Zement sehr schwierig ist, da Wasser als kontinuierlicher Strahl zugeführt werden muß. Zudem sind solche Mischer als nicht für dicke Mischungen geeignet beschrieben. From a Wiley-Interscience publication "Construction and Design of Cement Grouting "it is known to be one based on the Venturi principle working mixer, with the cement in the vacuum is sucked in and then with the water jet is mixed. However, it states that this is not a good one Mixing takes place and the control of the water: cement ratio is very difficult because water is a continuous stream must be supplied. In addition, such mixers are not for thick mixtures described suitably.

Aus der EP 0 498 279 ist eine Vorrichtung zum Aufbereiten und Verpressen einer Zementsuspension bekannt, die einen Aufbereitungsbereich und einen Verpreßbereich aufweist. Der Aufbereitungsbereich und der Verpreßbereich sind mit einer Verbindungsleitung miteinander verbunden und sie weisen jeweils einen Behälter, eine Kreislaufleitung und eine Pumpe auf, mit welcher die Zementsuspension zur Aufbereitung bzw. zum Verpressen zirkuliert werden kann. Diese Druckschrift lehrt, daß in der Kreislaufleitung des Aufbereitungsbereichs ein Sieb eingesetzt ist und die Behälter jeweils von einer von Kühlmittel durchflossenen Kühleinrichtung umgeben sind. Durch das Sieb soll eine Verklumpung unterbunden werden, da die Suspension mit relativ hohem Druck durch das Sieb gepreßt wird, wobei in der Suspension befindliche Klümpchen zerteilt werden.EP 0 498 279 describes a device for processing and Pressing a cement suspension known to a preparation area and has a pressing area. The processing area and the pressing area are with a connecting line connected to each other and they each have a container a circuit line and a pump with which the cement suspension is circulated for preparation or grouting can be. This document teaches that in the circulation line a strainer is inserted in the processing area and the containers are each filled with a coolant Cooling device are surrounded. A lump should pass through the sieve can be prevented because the suspension with a relatively high Pressure is pressed through the sieve, being in suspension Lumps are cut up.

Aus der US 4,863,277 ist ein System bzw. ein Verfahren für die automatisierte Mischung von flüssigen Materialien, beispielsweise flüssigen Düngern, bekannt.From US 4,863,277 is a system or a method for the automated mixing of liquid materials, for example liquid fertilizers, known.

Die Vorrichtung zum Durchführen des Mischverfahrens weist einen Wäge- und Mischbehälter auf, von dem die im Wäge- und Mischbehälter befindliche Flüssigkeit mittels einer Kreiselpumpe in einem ersten Kreislauf umgepumpt werden kann.The device for carrying out the mixing process has one Weighing and mixing container on, of which in the weighing and mixing container liquid in a centrifugal pump can be pumped in a first circuit.

Darüber hinaus ist ein zweiter Kreislauf vorgesehen, in welchem eine Venturi-Mischdüse angeordnet ist.In addition, a second circuit is provided, in which a venturi mixing nozzle is arranged.

Bei diesem Verfahren wird zunächst Wasser in den Mischtank bzw. Mischbehälter eingeführt, wobei das Gewicht der zugeführten Komponenten überwacht wird. Nachdem das Wasser zugeführt wurde und eine ausreichende Zuführmenge festgestellt wurde, werden weitere Bestandteile, wie beispielsweise flüssiger Ton, dem Mischbehälter zugeführt. Nachdem in dieser Art die gewünschten Komponenten dem Mischbehälter zugeführt wurden, wird die Mischpumpe, welche eine Kreiselpumpe ist, in Betrieb gesetzt und das Gemisch dadurch gemischt bzw. homogenisiert, daß es aus dem Mischtank abgezogen und dem Mischtank wieder zugeführt wird. With this method, water is first added to the mixing tank or Mixing container introduced, the weight of the supplied Components is monitored. After the water was added and a sufficient supply amount has been determined other components, such as liquid clay, the Mixing container supplied. Having in this way the desired ones Components have been fed to the mixing tank, the mixing pump, which is a centrifugal pump, put into operation and that Mixture mixed or homogenized in that it from the Mixing tank is withdrawn and fed back to the mixing tank.

Nach einer gewünschten und vorbestimmten Mischzeit wird der zweite Kreislauf geöffnet und diese Vormischung durch eine Venturi-Mischdüse geführt. Mittels dieser Venturi-Mischdüse wird nun eine Trockenkomponente der Vormischung zugeführt und wieder in den Mischtank gepumpt. Wenn eine gewünschte Menge Feststoff auf diese Weise zugeführt worden ist, wird der Venturi-Mischdüsen-Kreislauf wieder geschlossen und die Mischung zur weiteren Homogenisierung wieder in den ersten Mischkreislauf geführt. Abschließend wird ein Ventil im ersten Mischkreislauf geöffnet und der Inhalt der Mischbehälters mittels der Kreiselpumpe in einen Vorratsbehälter gepumpt. After a desired and predetermined mixing time, the second circuit opened and this premixing through a Venturi mixing nozzle guided. By means of this venturi mixing nozzle now a dry component is added to the premix and again pumped into the mixing tank. If a desired amount of solid has been supplied in this way, the venturi mixing nozzle circuit closed again and the mixture for further Homogenization returned to the first mixing cycle. Finally, a valve in the first mixing circuit is opened and the content of the mixing tank by means of the centrifugal pump in pumped a reservoir.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung von Feinstzement-hydraulischen Feinstbindemittelsuspensionen mit einem Siebdurchgang von größer gleich 95 % bei einer Maschenweite von 16 µm anzugeben, wobei keine Verklumpung des zu verarbeitenden Materials wie bei Verwendung hoch- oder niedertouriger Mischer auftritt und wobei für Feinstzement-Feinstbindemittel üblicherweise verwendete trockene, pulverförmige Zusatzmittel optimal aufgeschlossen werden, insgesamt daher eine völlig klumpenfreie Suspension erhalten wird.The invention has for its object a method for the production of fine cement-hydraulic fine binder suspensions with a sieve size greater than or equal to 95% at one Specify a mesh size of 16 µm, with no clumping of the material to be processed Materials like when using high or low speed Mixer occurs and for fine cement fine binder Commonly used dry powder additives are optimally open-minded, therefore a total lump-free suspension is obtained.

Diese Aufgabe wird durch das in Anspruch 1 gekennzeichnete Verfahren gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.This object is achieved by the method characterized in claim 1 solved. Advantageous developments of the invention are in the subclaims characterized.

Gegenstand der Erfindung ist daher ein Verfahren zur Aufbereitung von Feinstzement-hydraulischen Feinstbindemittelsuspensione, bei dem in einem geschlossenen Kreislauf zunächst in einen Vorratsbehälter 1 eine einer vorgegebenen Rezeptur entsprechende Wassermenge vorgelegt und über eine Pumpe 2 zu einem nach dem Venturi-Prinzip arbeitenden Mischer 3, wie eine Wasserstrahlpumpe, gepumpt wird, wobei der durch das den Mischer 3 durchströmende Wasser erzeugte Unterdruck den Feinstzement das Feinstbindemittel aus einem am Mischer 3 angeordneten Behälter 4 unter Ausbildung eines suspensionsartigen Gemisches einsaugt und diese Suspension zum Vorratsbehälter 1 transportiert, wobei mit einer Rühreinrichtung 5 gerührt wird, und anschließend die Suspension mittels der Pumpe 2 mindestens einmal wieder dem Kreislauf zugeführt und nach Beendigung einer vorgegebenen Aufbereitung an einer Abnahmestelle 6 aus dem Kreislauf entnommen wird.The subject of the invention is therefore a process for the preparation of fine cement hydraulic fine binder suspensions, in which in a closed circuit first in a storage container 1 a quantity of water corresponding to a given recipe submitted and via a pump 2 to a venturi principle working mixer 3, such as a water jet pump, pumped is, the water flowing through the mixer 3 generated negative pressure the fine cement the fine binder from a Mixer 3 arranged container 4 to form a suspension-like Mixes sucked in and this suspension to the reservoir 1 transported, with a stirring device 5 is stirred, and then the suspension by means of the pump 2 returned to the circuit at least once and after Completion of a specified preparation at an acceptance point 6 is removed from the circuit.

Mit diesem erfindungsgemäßen Verfahren kann anstatt eines reinen Feinstzement/Feinstbindemittels auch eine gleich feine Trockenmischung aus dem am Mischer 3 angeordneten Behälter 4 eingesaugt werden. Eine solche Trockenmischung ist aus dem Feinstzement/Feinstbindemittel und einem oder mehreren Zusatzmittel bzw. Zusatzstoffen zusammengesetzt.With this method according to the invention, instead of a pure one Fine cement / fine binder also an equally fine dry mix sucked out of the container 4 arranged on the mixer 3 become. Such a dry mix is from the Fine cement / fine binder and one or more additives or additives.

Ein weiterer Gegenstand der Erfindung ist die Verwendung einer Vorrichtung zur Durchführung des oben genannten Verfahrens, umfassend einen Vorratsbehälter 1 für Wasser, gegebenenfalls Zusatzmittel für den Feinstzement das Feinstbindemittel eine Transportleitung 7a vom Vorratsbehälter 1 zu einer dem Vorratsbehälter 1 nachgeschalteten Pumpe 2, eine weitere Transportleitung 7b von der Pumpe 2 zu einem nach dem Venturi-Prinzip arbeitenden Mischer 3, wie eine Wasserstrahlpumpe, an dem ein Behälter 4 für die Zugabe des Feinstzements/Feinstbindemittels vorgesehen ist, eine weitere Transportleitung 7c von dem Mischer 3 zu dem Vorratsbehälter 1, und durch eine mit der Pumpe 2 über eine Transportleitung 7d in Verbindung stehende Abnahmestelle 6, wobei die Anordnung von Vorratsbehälter 1, Pumpe 2 und Mischer 3 derart ist, daß diese über die Transportleitungen 7 cyclisch hintereinander geschaltet sind. Another object of the invention is the use of a device for Carrying out the above-mentioned procedure comprehensively a storage container 1 for water, optionally additives for the ultra-fine cement, the ultra-fine binder a transport line 7a from Storage container 1 to a downstream of the storage container 1 Pump 2, another transport line 7b from pump 2 to a mixer 3 operating according to the Venturi principle, such as one Water jet pump on which a container 4 for the addition of the Feinstzements / Feinstbindemittels is provided, a further transport line 7c of the mixer 3 to the reservoir 1, and by one with the Pump 2 connected via a transport line 7d Tapping point 6, the arrangement of storage container 1, Pump 2 and mixer 3 is such that these via the transport lines 7 are cyclically connected in series.

Im folgenden wird die Erfindung anhand einer Zeichnung näher erläutert, in der zeigt:

Fig. 1
eine Vorrichtung zur Durchführung des Verfahrens zum Herstellen der Feinstzement-/Feinstbindemittelsuspensionen.
The invention is explained in more detail below with reference to a drawing, in which:
Fig. 1
a device for performing the method for producing the fine cement / fine binder suspensions.

Die in Fig. 1 gezeigte Vorrichtung zur Herstellung der Feinstzement-/Feinstbindemittelsuspensionen umfaßt einen mit einem Rührwerk 5 versehenen Vorratsbehälter 1, der mit Wasser und gegebenenfalls mit für den Feinstzement das Feinstbindemittel üblichen Zusatzstoffen und/oder Zusatzmitteln beschickt werden kann. Transportleitungen 7a und 7b führen vom Vorratsbehälter 1 zur Pumpe 2 und weiter zu einem nach dem Venturi-Prinzip arbeitenden Mischer 3, wie eine Wasserstrahlpumpe, der mit einem Behälter 4 ausgerüstet ist, über den die Zugabe des Feinstzements/Feinstbindemittels. Durch den im Mischer 3 erzeugten Unterdruck wird der Feinstzement/das Feinstbindemittel aus dem Behälter 4 in das den Mischer 3 durchströmende Wasser unter Ausbildung eines suspensionsartigen Gemisches eingesaugt und über die Transportleitung 7c wieder zum Vorratsbehälter 1 transportiert.
Die Suspension kann nun mittels der Pumpe 2 aus dem Vorratsbehälter 1 erneut mindestens einmal zum Mischer 3 gepumpt und mit weiterem Feinstzement/Feinstbindemittel gemischt werden und wird anschließend wieder zum Vorratsbehälter 1 zurückgepumpt, wobei dieser Vorgang auch mehrfach wiederholbar ist, bis ein gewünschtes Wasser:Zement-Verhältnis eingestellt ist und die Zusatzmittel in der Suspension optimal verteilt und aufgeschlossen sind.The device shown in FIG. 1 for producing the fine cement / fine binder suspensions comprises a storage container 1 provided with an agitator 5, which can be charged with water and optionally with additives and / or additives customary for the fine cement. Transport lines 7a and 7b lead from the storage container 1 to the pump 2 and further to a mixer 3 which works according to the Venturi principle, such as a water jet pump, which is equipped with a container 4, via which the fine cement / fine binder is added. Due to the negative pressure generated in the mixer 3, the ultrafine cement / ultrafine binder is sucked out of the container 4 into the water flowing through the mixer 3 to form a suspension-like mixture and is transported again to the storage container 1 via the transport line 7c.
The suspension can now be pumped from the storage container 1 again at least once to the mixer 3 by means of the pump 2 and mixed with further fine cement / ultra-fine binder and is then pumped back again to the storage container 1, this process also being repeatable until a desired water: cement Ratio is set and the additives in the suspension are optimally distributed and digested.

Um optimale Verfestigungsbedingungen für die derart hergestellte Feinstzement-/Feinstbindemittelsuspension beispielsweise beim Füllen von Rissen oder Spalten und Klüften im Fels zu erzielen, ist gemäß einer vorteilhaften Ausgestaltung in Abhängigkeit von der Außentemperatur der Vorratsbehälter (1) mittels einer Heizoder Kühleinrichtung heiz- oder kühlbar, so daß die Feinstzement-/Feinstbindemittelsuspension auf einen exakten optimalen Temperaturbereich einstellbar ist.To optimal consolidation conditions for the so produced Fine cement / fine binder suspension, for example at Filling cracks or crevices and fissures in the rock is according to an advantageous embodiment depending on the outside temperature of the storage container (1) by means of a heating or Cooling device can be heated or cooled, so that the fine cement / fine binder suspension to an exact optimal Temperature range is adjustable.

Durch die mindestens ein- oder mehrmalige Führung der Suspension im Kreislauf ist es möglich, trockene, pulverförmige Zusatzmittel im Feinstzement/Feinstbindemittel erstmals optimal aufzuschließen, so daß eine Reduzierung der verwendeten Zusatzmittelmengen möglich ist.By guiding the suspension at least once or several times in the cycle it is possible to use dry, powdery additives to optimally digest in fine cement / fine binder for the first time, so that a reduction in the amounts of additives used is possible.

Durch die getrennte Zuführung von Wasser/gegebenenfalls Zusatzstoffen/Zusatzmitteln in den Vorratsbehälter 1 und des Feinstzements/Feinstbindemittels in den Mischer 3 und das im Mischer 3 erfolgende schnelle Vermischen der Bestandteile wird eine Verklumpung in der Suspension vermieden, wobei insbesondere durch den Einsatz des nach dem Venturi-Prinzips arbeitenden Mischers 3, wie einer Wasserstrahlpumpe, im Vergleich zu mechanisch arbeitenden hochtourigen oder niedertourigen Mischern die Zufuhr zusätzlicher Reibungswärme in das Mischungssystem vermieden wird und das Gemisch auch keinerlei Temperaturerhöhung durch den Pumpenbetrieb erfährt, da der Motorblock vom Beförderungsaggregat der Pumpe getrennt ist. Auf diese Weise läßt sich die Aufbereitung der Feinstzement-/Feinstbindemittelsuspension bei weitgehend konstanter Temperatur durchführen.Through the separate supply of water / possibly additives / additives in the storage container 1 and the fine cement / fine binder in mixer 3 and in mixer 3 Rapid mixing of the ingredients becomes a clump avoided in the suspension, especially by the use of the mixer working according to the Venturi principle 3, like a water jet pump, compared to mechanical working high-speed or low-speed mixers the supply additional frictional heat in the mixing system is avoided and the mixture also no temperature increase by the Pump operation experiences because the engine block from the conveyor the pump is disconnected. In this way, the preparation can the fine cement / fine binder suspension at largely perform constant temperature.

Die Vorrichtung besitzt neben der einfachen und schnellen Herstellung klumpenfreier Suspensionen mit gutem Aufschluß der darin enthaltenen Zusatzmittel noch den weiteren Vorteil, daß der Vorratsbehälter 1 beispielsweise bei hohen Temperaturen im Sommer gekühlt oder beheizt werden kann, wenn die Suspension im kühlen Fels verarbeitet wird, um eine optimale Verfestigung im Fels zu gewährleisten.In addition to the simple and Rapid production of lump-free suspensions with good digestion the additives contained therein and the others Advantage that the storage container 1, for example at high Summer temperatures can be cooled or heated, though the suspension is processed in the cool rock to ensure optimal Ensure solidification in the rock.

Durch das erfindungsgemäße Verfahren und die verwendete Vorrichtung ist es möglich, robuste, in ihrer Handhabung äußerst einfache und kostengünstige Mischaggregate für die baustellengerechte Anwendung bereitzustellen, ohne auf die hohen mischtechnischen Anforderungen an die Feinstzementsuspensionen und die Feinstbindemittel zu verzichten.By the method according to the invention and the one used The device makes it possible to be robust, extremely easy to handle simple and inexpensive mixing units for site-specific Provide application without relying on the high mixing Requirements for fine cement suspensions and fine binders to renounce.

Claims (7)

  1. Process for preparing ultrafine cement/ultrafine hydraulic binder suspensions, with a screening undersize of ≥ 95% in the case of a mesh width of 16 µm, characterized in that, in a closed cycle, a quantity of water corresponding to a given formulation is initially introduced into a storage tank (1) and is subsequently pumped by means of a pump (2) to a mixer (3) operating on the Venturi principle, the negative pressure produced by the water flowing through the mixer (3) sucking in the ultrafine cement/ultrafine hydraulic binder from a tank (4) arranged on the mixer (3), thereby forming a suspension-like mixture, and this suspension being transported to the storage tank (1), with stirring taking place by means of a stirring device (5), and the suspension subsequently being fed by means of the pump (2) at least once back to the cycle and, after that, removed from the cycle at a take-off point (6).
  2. Process according to Claim 1, characterized in that ultrafine cement/ultrafine binder continues to be added during the cycle.
  3. Process according to Claim 1 or 2, characterized in that addition agents and/or additives customary for the ultrafine cement/ultrafine binder are added to the storage tank (1).
  4. Process according to one of Claims 1 to 3, characterized in that the preparation takes place at a largely constant temperature.
  5. Process according to one of Claims 1 to 4, characterized in that the storage tank (1) is heated or cooled.
  6. Use of a device for carrying out the process according to one of Claims 1 to 4, characterized in that the device comprises a storage tank (1), provided with a stirring device (5), for water, possibly addition agents and/or additives for the ultrafine cement/ultrafine binder, a transport line (7a) from the storage tank to a pump (3) arranged downstream of the storage tank, a further transport line (7b) from the pump (2) to a mixer (3) operating on the Venturi principle, for example a water-jet pump, on which a tank (4) for the adding of the ultrafine cement/ultrafine binder is provided, a further transport line (7c) from the mixer (3) to the storage tank (1) and a take-off point (6), which is connected to the pump (2) via a transport line (7d), the arrangement of the storage tank (1), pump (2) and mixer (3) being such that they are connected cyclically one behind other via the transport lines (7a, 7b, 7c).
  7. Use according to Claim 6, characterized in that the device comprises a storage tank (1) which is equipped with a heating or cooling device.
EP96114901A 1995-10-11 1996-09-17 Process for manufacturing fine cement/ultrafine binder suspensions Expired - Lifetime EP0768113B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19537874A DE19537874C2 (en) 1995-10-11 1995-10-11 Process and device for the production of fine cement / fine binder suspensions
DE19537874 1995-10-11

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EP0768113A1 EP0768113A1 (en) 1997-04-16
EP0768113B1 true EP0768113B1 (en) 2003-04-02

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AT (1) ATE235953T1 (en)
CZ (1) CZ290796A3 (en)
DE (2) DE19537874C2 (en)
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PL (1) PL184282B1 (en)
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DE10010287B4 (en) * 2000-02-25 2004-02-12 Infineon Technologies Ag Process for the preparation of liquid mixtures for chemical mechanical polishing of wafers
DE10037118A1 (en) * 2000-07-28 2002-02-14 Univ Clausthal Tech Process for producing a swelling cement and associated test device
WO2005000454A1 (en) * 2003-06-27 2005-01-06 Mmd Design & Consultancy Limited Apparatus and method for mixing particulate material with a fluid to form a pumpable slurry
EP1745840A1 (en) * 2005-07-22 2007-01-24 Services Petroliers Schlumberger Apparatus and method for mixing a liquid material and a flowable powdery material to obtain a slurry
GB201020923D0 (en) * 2010-12-09 2011-01-26 Akzo Nobel Coatings Int Bv An assembly
DE102011119816B4 (en) * 2011-12-01 2015-08-27 Sartorius Stedim Biotech Gmbh System and method for cell separation
FI125394B (en) 2012-04-27 2015-09-30 S T Ritvanen Oy Process for feeding granular suspended matter in liquid
CN111173286B (en) * 2020-03-02 2021-08-24 广东博智林机器人有限公司 Feeding device and grooving robot
CN112430857A (en) * 2020-11-25 2021-03-02 浙江炜烨晶体纤维有限公司 Pressure cooker for polycrystalline mullite fiber spinning

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DE4313721C2 (en) * 1993-04-27 1995-11-23 Werner Prof Dr Ing Moeller Method and device for mixing a liquid with a disperse solid, in particular with an agglomerating solid

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EP0768113A1 (en) 1997-04-16
NO963801L (en) 1997-04-14
SK127396A3 (en) 1997-08-06
NO963801D0 (en) 1996-09-11
PL184282B1 (en) 2002-09-30
SI9600291A (en) 1997-08-31
HUP9602643A3 (en) 1999-05-28
ATE235953T1 (en) 2003-04-15
NO307550B1 (en) 2000-04-25
DE19537874C2 (en) 1997-10-23
CZ290796A3 (en) 1997-04-16
ES2107986T1 (en) 1997-12-16
DE59610293D1 (en) 2003-05-08
DE19537874A1 (en) 1997-04-17
PL316464A1 (en) 1997-04-14
HU9602643D0 (en) 1996-11-28
HUP9602643A2 (en) 1999-04-28

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