EP1546060A2 - Suspensions - Google Patents

Suspensions

Info

Publication number
EP1546060A2
EP1546060A2 EP03792403A EP03792403A EP1546060A2 EP 1546060 A2 EP1546060 A2 EP 1546060A2 EP 03792403 A EP03792403 A EP 03792403A EP 03792403 A EP03792403 A EP 03792403A EP 1546060 A2 EP1546060 A2 EP 1546060A2
Authority
EP
European Patent Office
Prior art keywords
suspensions
aluminum sulfate
weight
bentonite
setting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP03792403A
Other languages
German (de)
English (en)
Inventor
Rudolf Lunkenheimer
Hubert DÖRRER
Jochen Stein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kurita Water Industries Ltd
Original Assignee
BK Giulini GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BK Giulini GmbH filed Critical BK Giulini GmbH
Publication of EP1546060A2 publication Critical patent/EP1546060A2/fr
Ceased legal-status Critical Current

Links

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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • C04B22/142—Sulfates
    • C04B22/148—Aluminium-sulfate
    • 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
    • C04B40/0039—Premixtures of ingredients
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00146—Sprayable or pumpable mixtures
    • C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
    • C04B2111/00172—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite by the wet process
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
    • C04B2111/1006—Absence of well-defined organic compounds
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
    • C04B2111/1025—Alkali-free or very low alkali-content materials

Definitions

  • the present invention relates to suspensions, their preparation and their use to accelerate the setting and hardening of cement and mixtures containing it.
  • Shotcrete has to set very quickly, e.g. to guarantee the highest level of security and smooth tunneling during tunnel construction.
  • Setting accelerators are used for this purpose.
  • Alkaline accelerators are highly caustic and therefore hazardous to health, they reduce the final strength of the concrete and force the shrinkage, which can lead to increased crack formation.
  • the alkali metals of these accelerators can be washed out, which can lead to contamination of ground and drinking water and to the increased sintering of drainage.
  • Aluminum sulfate and aluminum hydroxysulfates are based.
  • Aluminum sulfate is well suited as a setting accelerator, although it is technically of great advantage to provide the setting accelerator in liquid form. Due to the low water solubility of aluminum sulfate of approximately 8% by weight as Al O 3 , large amounts of the aluminum sulfate solution would be necessary to achieve the above-mentioned
  • the accelerators described above are offered both as powders and as liquids (solution or suspension), whereby in any case the liquid products are preferable to the powders because of their better meterability, the more homogeneous distribution and faster release of the active substance.
  • EP 0 812 812 AI and US 5,935,318 describe an accelerating additive for cementitious compositions which contains aluminum sulfate, largely free of aluminum hydroxide, and at least one alkanolamine.
  • the accelerating additive can also contain a stabilizer selected from polymer dispersions or sepiolite.
  • EP 0 858 981 A1 describes a setting and hardening accelerator containing aluminum salt, preferably Al 2 (SO 4 ) 3; claimed, which is characterized in that it contains a) amorphous silica and b) an inorganic and / or organic thixotropic agent and / or an organic carbonic acid ester.
  • This accelerator necessarily requires at least three components, using both organic and inorganic thickeners to keep the amorphous silica in suspension.
  • Organic thickeners are described here by way of example, but bentonite is also mentioned as the inorganic thickener.
  • the concentrations of the aluminum salts are also significantly below 8% by weight, so that relatively large amounts of the accelerating solution are necessary, which has a negative effect on the water / cement Ratio affects.
  • the present invention was therefore based on the object of providing the market with a setting and hardening accelerator in liquid form which is free or almost free of COD-containing substances and has good effectiveness.
  • suspensions which are characterized in that they contain aluminum sulfate in amounts of more than 8% by weight as Al 2 O 3 and suspended or dispersed bentonite in amounts of 1 to 7% by weight , In contrast to the prior art products cited above, these suspensions contain neither alkanolamines nor amorphous silica, nor organic thixotropic agents.
  • suspensions is understood to mean systems which consist of several phases, one of which is continuous and at least one further is finely divided, the finely divided phase predominantly comprising solid particles with a particle size of less than 100 ⁇ m, preferably less than 70 ⁇ m.
  • the suspensions are produced by a process which is characterized in that aluminum sulfate, which is partly in solid form, is stirred in the presence of bentonite in water at elevated temperatures, preferably at temperatures up to 100 ° C., so that a suspension is formed ,
  • aluminum sulfate includes compounds of the formula
  • the aluminum sulfate is used in an amount of more than 8% by weight to 15% by weight, in particular 10 to 12% by weight, based on Al O 3 .
  • Ca, Ca / Na and Na bentonites are preferred as bentonites, which in
  • Water are dispersible. In particular, an amount of 2 to 6% by weight is used.
  • the suspensions are prepared by introducing water into a reactor equipped with a stirrer, stirring aluminum sulfate in solid form and bentonite and homogeneously suspending both components at room temperature, preferably at elevated temperature. A large proportion of the aluminum sulfate dissolves, the rest is later in suspension, the suspended portions being stabilized by bentonite with regard to sedimentation.
  • a preferred method is characterized in that bentonite is suspended in an aluminum sulfate solution in a first step, and solid aluminum sulfate is added to this suspension in a second step, and this is then homogeneously suspended at elevated temperature.
  • the temperature does not exceed 100 ° C.
  • the suspension is prepared so that a
  • Aluminum sulfate is stirred in as a solid material with high shear rate.
  • the suspension is then heated to 70 ° C, a further 15 to 120 min. with the
  • Toothed washer stirred and cooled.
  • the end product has an aluminum sulfate content, expressed as Al O 3 , of over
  • the suspensions are preferably used in the range from 1 to 15%, based on the binder.
  • a commercially available suspension (Meyco SA 160, MBT - Switzerland) with an Al 2 O 3 content of 10.3% by weight and a COD content of 99 g / kg served as a comparison.
  • the suspensions according to the invention have advantages over the comparison in the Vicat test.
  • the content of amorphous silica must be at least 5% by weight.
  • the setting accelerator can contain up to 5% by weight bentonite.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne des suspensions, leur fabrication et leur utilisation dans la catalyse de la prise et du durcissement de ciment, ainsi que des mélanges contenant ce ciment. Les suspensions selon l'invention sont composées de sulfate d'aluminium dans une quantité supérieure à 8 % en poids en tant que Al2O3, de préférence supérieure à 10 à 12 % en poids, et de bentonite en suspension dans une quantité de 1 à 7 % en poids. Les suspensions selon l'invention constituent notamment des alternatives économiques et écologiques dans le domaine de la pulvérisation humide. Les supensions selon l'invention sont libres de DCO et d'alcalis.
EP03792403A 2002-08-23 2003-08-21 Suspensions Ceased EP1546060A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10238789A DE10238789B4 (de) 2002-08-23 2002-08-23 Verfahren zur Herstellung von Suspensionen und deren Verwendung
DE10238789 2002-08-23
PCT/EP2003/009256 WO2004018380A2 (fr) 2002-08-23 2003-08-21 Suspensions

Publications (1)

Publication Number Publication Date
EP1546060A2 true EP1546060A2 (fr) 2005-06-29

Family

ID=31197303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03792403A Ceased EP1546060A2 (fr) 2002-08-23 2003-08-21 Suspensions

Country Status (5)

Country Link
US (1) US7470317B2 (fr)
EP (1) EP1546060A2 (fr)
AU (1) AU2003264081A1 (fr)
DE (1) DE10238789B4 (fr)
WO (1) WO2004018380A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2248780A1 (fr) 2009-05-06 2010-11-10 BK Giulini GmbH Accélérateur de prise et de durcissement

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1724246A1 (fr) * 2005-05-18 2006-11-22 I.C.R.S. Industrial Ceramic Reinforcement Solution S.r.L. Adjuvant auxiliaire pour matériaux à base de ciment
KR20100105868A (ko) * 2008-01-11 2010-09-30 컨스트럭션 리서치 앤 테크놀로지 게엠베하 수성 가속제 혼합물
JP2014019623A (ja) * 2012-07-20 2014-02-03 Denki Kagaku Kogyo Kk 懸濁型セメント急結剤及びそれを用いた急結セメントコンクリート

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0858981A1 (fr) 1997-02-14 1998-08-19 Sika AG, vorm. Kaspar Winkler & Co. Accelerateur de durcissement pour ciment
EP1167317A1 (fr) 2000-06-21 2002-01-02 Sika AG, vorm. Kaspar Winkler & Co. Accelerateur de prise et de durcissement exempt de métaux alcalins

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069062A (en) * 1973-05-08 1978-01-17 Sika Ag, Vormals Kaspar Winkler & Co. Additive for mortar and concrete
US4359339A (en) * 1980-12-16 1982-11-16 Nl Industries, Inc. Bentonite clay and water soluble aluminum salt compositions
SU956529A1 (ru) * 1981-01-05 1982-09-07 Волжский Филиал Всесоюзного Научно-Исследовательского Института Абразивов И Шлифования Суспензи дл механической обработки металлов
JP2598646B2 (ja) 1987-08-13 1997-04-09 日本ピー・エム・シー株式会社 ベントナイト粉末の分散方法
US4883536A (en) * 1988-08-05 1989-11-28 Aqualon Company Suspension of water-soluble polymers in aqueous media containing dissolved salts
CA2115390C (fr) * 1993-03-22 1999-08-24 Bharat B. Patel Composition liquide constituee d'un aluminate metallique ou d'un promoteur de viscosite et d'un compose de magnesium, et methode d'utilisation de ladite composition
DE4312290A1 (de) * 1993-04-15 1994-10-20 Degussa Fäll- und Flockungsmittel
DE4410728A1 (de) 1994-03-28 1995-10-05 Sued Chemie Ag Hilfsmittel für mineralische Bindemittelsysteme
AU723970B2 (en) * 1996-06-14 2000-09-07 Construction Research & Technology Gmbh Concrete spraying additives
EP0812812B1 (fr) 1996-06-14 2003-01-29 Mbt Holding Ag Additif pour béton projeté
JP3384547B2 (ja) 1998-11-30 2003-03-10 電気化学工業株式会社 ノロ低減剤
DE10029869C2 (de) * 2000-06-16 2003-10-30 Rex Ind Produkte Graf Von Rex Faserfreies, nicht brennbares, geschäumtes Isolier- und Brandschutzmaterial und Verfahren zu seiner Herstellung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0858981A1 (fr) 1997-02-14 1998-08-19 Sika AG, vorm. Kaspar Winkler & Co. Accelerateur de durcissement pour ciment
EP1167317A1 (fr) 2000-06-21 2002-01-02 Sika AG, vorm. Kaspar Winkler & Co. Accelerateur de prise et de durcissement exempt de métaux alcalins

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2004018380A3

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2248780A1 (fr) 2009-05-06 2010-11-10 BK Giulini GmbH Accélérateur de prise et de durcissement

Also Published As

Publication number Publication date
US20060249055A1 (en) 2006-11-09
AU2003264081A1 (en) 2004-03-11
WO2004018380A3 (fr) 2004-05-21
DE10238789B4 (de) 2006-01-05
AU2003264081A8 (en) 2004-03-11
DE10238789A1 (de) 2004-03-04
US7470317B2 (en) 2008-12-30
WO2004018380A2 (fr) 2004-03-04

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