DE2744365A1 - Gas concrete, made from line, cement and sand - where dolomite is added to lower reaction temp. - Google Patents

Gas concrete, made from line, cement and sand - where dolomite is added to lower reaction temp.

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Publication number
DE2744365A1
DE2744365A1 DE19772744365 DE2744365A DE2744365A1 DE 2744365 A1 DE2744365 A1 DE 2744365A1 DE 19772744365 DE19772744365 DE 19772744365 DE 2744365 A DE2744365 A DE 2744365A DE 2744365 A1 DE2744365 A1 DE 2744365A1
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DE
Germany
Prior art keywords
sand
added
dolomite
weight
mixture
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.)
Withdrawn
Application number
DE19772744365
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German (de)
Other versions
DE2744365B2 (en
Inventor
Dieter Dr Hums
Klaus-Friedrich Lippe
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Ytong AG
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Ytong AG
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Publication date
Application filed by Ytong AG filed Critical Ytong AG
Priority to DE19772744365 priority Critical patent/DE2744365A1/en
Publication of DE2744365A1 publication Critical patent/DE2744365A1/en
Publication of DE2744365B2 publication Critical patent/DE2744365B2/de
Withdrawn legal-status Critical Current

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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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/26—Carbonates
    • 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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • 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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/18—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mixtures of the silica-lime type

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

Mixt. is made of (a) binders; (b) sand; (c) foamant, esp. Al powder; (d) finely milled, natural and/or synthetic prim. carbonates of Ca and/or Mg; and (e) water. The mixt. is cast in moulds, set, possibly cut to size and hardened hydrothermally. Material (d) is pref. calcite or dolomite mixed with the sand (b), esp. by milling silica sand and dolomite to obtain a mixt. contg. 85-95% SiO2 with 15-5% dolomite, milling being for 1-2 hrs. to obtain size distribution by wt.:- 24.1% over 0.09 mm; 9.2% at 0.09-0.63 mm; 9.8% at 0.063-0.045 mm; and 56.9% below 0.045 mm. Materials (d) lower the reaction temp., so more CaO and/or MgO can be included in binders (a).

Description

'«er.~-ren zur Herstellung von Gasbeton De erfindung betrifft ein Verfahren zur Herstellung von Gasbeton, wobei man ein Gemenge aus Bindemittel, Wasser ur.d einer Sandkomponente sowie einem Treibmittel, insbeschere Aluminiumpulver, zu einer gießfähigen Masse mischt, d e Masse in Formen gießt, gären und ansteifen läßt, ggf.'"He. ~ -Ren for the production of aerated concrete De invention concerns a Process for the production of aerated concrete, whereby a mixture of binding agent, water ur.d a sand component and a propellant, including aluminum powder, mixes to a pourable mass, pours the mass into molds, fermenting and setting lets, if necessary

schneidet und hydrothermal härtet.cuts and hydrothermally hardens.

Es ist bekannt, als Bindemittel verschiedene Kalksorten nach DIN 1060 allein oder im Gemisch zur Herstellung von Gasbeton zu verwenden. In der Regel wird Feinkalk insbesondere Weiß-Feinkalk verwendet, der beim Ablöschen in der Mischung Wärme entwickelt und den Gärprozeß initiiert.It is known that various types of lime according to DIN 1060 are used as binders to be used alone or in a mixture for the production of aerated concrete. Usually will Fine lime, especially white fine lime, is used when deglazing in the mixture Develops heat and initiates the fermentation process.

Je höher daher der Feinkalkgehalt der Mischung ist, umso höher liegen die Temperaturen der Masse. Da zu hohe Temperaturen jedoch schädlich sein können, ist die Zugabemenge des Feinkalks insofern begrenzt. Andererseits sind die Gasbeton-Eigenschaften optimal, wenn hohe Feinkalkmengen verwendet werden. Sowohl die Dimensionsstabilität als auch die Festigkeit ergeben dabei ein Maximum in Abhängigkeit vom Feinkalkgehalt. Dieses Maximum liegt in der Regel bei wesentlich höheren Feinkalkgehalten, als betrieblich wegen der hohen Endtemperatur einsetzbar sind. Es wird daher als Bindemittel häufigen Gemisch aus Feinkalk und Zement eingesetzt. Der Zementanteil verändert aber nahezu die gesamten Eigenschaften üblicher Gasbetonmischungen negativ.Therefore, the higher the fine lime content of the mixture, the higher it is the temperatures of the mass. However, since temperatures that are too high can be harmful, the amount of fine lime that can be added is therefore limited. On the other hand are the aerated concrete properties ideal when high amounts of fine lime are used. Both dimensional stability as well as the strength results in a maximum depending on from the fine lime content. This maximum is usually at significantly higher levels of fine lime, than can be used operationally because of the high final temperature. It is therefore called Binding agents are often used as a mixture of fine lime and cement. The cement content but changes almost all of the properties of conventional aerated concrete mixes negatively.

Als ein anderes Bindemittel ist im Gemisch auch schon Magnesiumoxid oder Magnesiumhydroxid verwendet worden. Denn das MgO dieser Substanzen wird im Hydrothermal-Prozeß in Magnesiumsilikathydrate umgewandelt, die ihrerseits besonders resistent gegen eine feuchte C02 enthaltende Atmosphäre sind und damit die Dimensionsstabilität der fertigen Gasbeton-Bauteile steigern. Die verwendeten Substanzen sind jedoch ebenso wie die reinen Kalkkomponenten teer.Magnesium oxide is also already in the mixture as another binding agent or magnesium hydroxide has been used. Because the MgO of these substances is in the Hydrothermal process converted into magnesium silicate hydrates, which in turn are special are resistant to a humid atmosphere containing C02 and thus the dimensional stability of the finished aerated concrete components. However, the substances used are just like the pure lime components tar.

Versucht worden ist ferner, dolomitische Feinkalke einzusetzen. Da diese jedoch zum unkontrollierbaren Nachtreiben neigen, ist deren Verwendung in der Regel nicht möglich.Attempts have also been made to use dolomitic fine limestone. There However, if these tend to drift uncontrollably, their use is in usually not possible.

Außerdem sind dolomitische Peinkalke auch relativ teuer.In addition, dolomitic Peinkalke are also relatively expensive.

Aufgabe der Erfindung ist, den Bindemittelgehalt in bezug auf die CaO- und/oder MgO-Komponente einer Gasbetonmischung zu erhöhen, ohne daß die Reaktionstemperatur gesteigert und die Qualität des Gasbeton-Bauteils beeinträchtigt werden.The object of the invention is the binder content in relation to the To increase the CaO and / or MgO component of an aerated concrete mixture without increasing the reaction temperature increased and the quality of the aerated concrete component is impaired.

Diese Aufgabe wird erfindungsgemäß bei einem Verfahren der eingangs beschriebenen Art dadurch gelöst, daß zum Gemenge natürliche und/oder synthetische Primärkarbonate des Calciums und/oder Magnesiums in sehr feiner Form zugesetzt werden.According to the invention, this object is achieved in a method of at the beginning described type solved in that the mixture natural and / or synthetic Primary carbonates of calcium and / or magnesium are added in very fine form.

Mit dem Begriff "natürliche Primärkarbonate" werden die natürlich vorkommenden Kalksteine, Dolomitsteine oder Magnesiumkarbonatsteine sowie die Kalzite, Dolomite und Magnesiumkarbonate als Bestandteile in anderen natürlich vorkommenden Gesteinen oder Sanden bezeichnet.With the term "natural primary carbonates" they become natural occurring limestones, dolomite stones or magnesium carbonate stones as well as the calcites, Dolomites and magnesium carbonates as components in other naturally occurring Called rocks or sands.

Es hat sich in überraschender Weise gezeigt, daß sehr fein aufbereitete bzw. gemahlene Calciumk-arbonate, Magnesiumkarbonate und Dolomite im Hydrothermalprozeß als Reaktionspartner zur Kieselsäure fungieren, wenn das Kristallgitter dieser natürlichen Stoffe derart fehlgeordnet wird, daß die CaO- und/oder MgO-Ionen von den C02-Ionen unter der Temperatureinwirkullg im Hydrothermalprczeß gespalten werden können.It has surprisingly been found that very finely prepared or ground calcium carbonates, magnesium carbonates and dolomites in the hydrothermal process act as reactants to the silica when the crystal lattice is this natural Substances is so disordered that the CaO and / or MgO ions are separated from the C02 ions can be split under the influence of temperature in the hydrothermal process.

Die Feinstaufbereitung kann mit jedem geeigneten Mahlaggregat bei Verwendung von Kalkstein oder Dolomit erfolgen. Besonders günstig ist die gemeinsame Vermahlung mit dem Quarzsand. Aufgrund der relativ geringen Härte des Kalzits bzw.The fine processing can be done with any suitable grinding unit Use limestone or dolomite. The joint is particularly cheap Grinding with the quartz sand. Due to the relatively low hardness of the calcite or

Dolomits gegenüber dem Quarzsand werden diese Stoffe feint aufgemahlen. Dabei werden durch tribomechanisch Effekte die Karbonatminerale soweit in ihrem Gitter fehlgcordnet, daß in überraschenderWeise im Hydrothermalprozeß eine Dissoziierung möglich wird und die CaO- und/oder MgO-Ionen in die sich bildenden Calciumsilikathydrate eingebaut werden oder eigene Hydratphasen bilden.Dolomites, compared to the quartz sand, these substances are finely ground up. The carbonate minerals are so far in their Lattice misordered that surprisingly a dissociation in the hydrothermal process becomes possible and the CaO and / or MgO ions in the forming Calcium silicate hydrates be incorporated or form their own hydrate phases.

Untersuchungen der gehärteten Gasbeton-Bauteile haben ergeben daß röntgenographisch weniger Karbonate vorhanden sind, als theoretisch zu erwarten ist. Vielmehr ist die Tobermoritausbildung der Gasbetonbauteile im Vergleich zur Tobermoritausbildung üblicher Gasbetonbauteile stärker ausgeprägt. Bei Zusatz der Karbonate bleiben die Festigkeiten des Gasbetons zumindest erhalten. Die Dimensionsstabilität konnte gesteigert werden.Investigations of the hardened aerated concrete components have shown that Radiographically fewer carbonates are present than theoretically expected is. Rather, the tobermorite formation of the aerated concrete components is compared to Tobermorite formation of conventional aerated concrete components is more pronounced. With the addition of the Carbonates at least retain the strength of the aerated concrete. The dimensional stability could be increased.

Die für die Reaktionsbereitschaft erforderliche Feinheit läßt sich empirisch ermitteln. Anhaltspunkte ergibt hierfür aber auch eine Röntgenbeugungsanalyse, in der eine Verbreiterung und geringere Höhe bestimmter Karbonatpeaks eine Fehlordnung andeutet.The fineness required for readiness to react can be determine empirically. An X-ray diffraction analysis also provides clues for this, in which a broadening and lower height of certain carbonate peaks a disorder indicates.

Anhand des folgenden Beispiels wird die Erfindurg näher erläutert.The invention is explained in more detail using the following example.

Zur Herstellung eines Gasbeton-Bauteils werden 400 kg Feinkalk, 90 kg Zement, 1810 kg Sandkomponente, 2,0 kg Aluminiumpulver und 1250 1 Wasser innig gemischt und in Formen gegossen.400 kg of fine lime, 90 kg cement, 1810 kg sand component, 2.0 kg aluminum powder and 1250 1 water intimately mixed and poured into molds.

Man läßt die Masse dann ansteifen und gären. AnschlieBend wird die Masse geschnitten und in an sich bekannter Weise bei etws 1900 C hydrothermal gehärtet.The mass is then allowed to set and ferment. Then the Mass cut and in a known manner sths 1900 C hydrothermally hardened.

Die Sandkomponente besteht aus 90 Gew.-% SiO2 und 10 Gew.-% Dolomit. Sie ist hergestellt worden durch 1,5-stündige gemeinsame Vermahlung eines Quarzsandes mit einem Dolomitsand.The sand component consists of 90% by weight SiO2 and 10% by weight dolomite. It is made by grinding a quartz sand together for 1.5 hours with a dolomite sand.

Nach der Vermahlung weist die Sandkomponente die folgende kornanalyse auf: > 0,09 mm 24,1 Gew.-% 0,09 - 0,063 mm 9,2 Gew.-% 0,063- 0,045 mm 9,8 Gew.-% < 0,045 mm 56,9 Gew.-% Eine Röntgenanalyse der Ausgangsmischung im Vergleich zur Röntgenanalyse der Endmischung der Sandkomponente ergibt eine deutliche Verkürzung und Verbreiterung des Dolomito peaks bei 2,886 A. Die Verkürzung des Dolomitpeaks ergab sich im Verhältnis 1,4 : 1 und die Basisverbreiterung im Verhältnis 1 : 1,16 Die Röntgenanalyse der fertigen Gasbetonbauteile zeigt, daß die Peakhöhe des Carbonats nur noch 12 mm beträgt, während sie theoretisch etwa 40 mm betragen müßte. Die Tobermoritkristallphase ist sehr gut ausgebildet. Neben den üblichen Hydratphasen kann keine andere z. B. C02 enthaltende Phase aufgefunden werden.After grinding, the sand component has the following grain analysis on:> 0.09 mm 24.1% by weight 0.09 - 0.063 mm 9.2% by weight 0.063- 0.045 mm 9.8% by weight <0.045 mm 56.9% by weight An X-ray analysis of the starting mixture in comparison X-ray analysis of the final mixture of the sand component shows a clear reduction and broadening of the dolomito peak at 2.886 A. The shortening of the dolomite peak resulted in a ratio of 1.4: 1 and the base broadening in a ratio of 1: 1.16 The X-ray analysis of the finished aerated concrete components shows that the peak height of the carbonate is only 12 mm, while theoretically it should be about 40 mm. the Tobermorite crystal phase is very well trained. In addition to the usual hydrate phases, no other z. B. C02-containing phase can be found.

Die vorliegende Erfindung ermöglicht somit, billige Rohstoffe wie z. B. Kalkstein oder Dolomit als Reaktionspartner für den Hydrothermalprozeß in Gasbetonmischungen zur Verfügung zu stellen.The present invention thus enables cheap raw materials such as z. B. limestone or dolomite as a reaction partner for the hydrothermal process in To provide aerated concrete mixes.

Claims (7)

ANSPRüCHE 1. Verfahren zur Herstellung von Gasbeton, wobei man ein Gemenge aus Bindem;ttel, Wasser und einer Sandkomponente sowie einem Treibmittel, insbesondere Aluminiumpulver, zu einer gießfähigen Masse mischt, die Masse in Formen gießt, gären und ansteifen läßt, ggf. schneidet und hydrothermal härtet, d a d u r c h ge k e n n z e i c hn e t, daß zum Gemenge natürliche und/oder synthetische Primärkarbonate des Calciums und/oder Magnesiums in sehr fein gemahlener Form zugesetzt werden. CLAIMS 1. Process for the production of aerated concrete, whereby one Mixture of binding agent, water and a sand component as well as a blowing agent, in particular aluminum powder, mixed into a pourable mass, the mass in molds pours, ferment and stiffen, if necessary cuts and hydrothermally hardens, d a d u It is not stated that the mixture is natural and / or synthetic Primary carbonates of calcium and / or magnesium are added in very finely ground form will. 2. Verfahren nach Anspruch 1, d a d u r c h g e k e n n -z e i c h n e t, daß sehr fein gemahlener Kazit zugesetzt wird.2. The method according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that very finely ground kazite is added. 3. Verfahren nach Anspruch 1, d a d u r c h g e k e n n -z e i c h n e t, daß sehr fein gemahlener Dolomit zugesetzt wird.3. The method according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that very finely ground dolomite is added. 4. Verfahren nach einem oder mehreren der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t, daß die Primärkarbonate im Gemisch mit der Sandkomponente zugesetzt werden.4. The method according to one or more of claims 1 to 3, d a d u r c h e k e n n n n e i n e t that the primary carbonates in a mixture with the Sand component can be added. 5. Verfahren nach einem oder mehreren der Ansprüche 1 bis 4, d a d u r c h g e k e n n z e i c h n e t, daß eine Sandkomponente zugesetzt wird, die durch gemeinsame Vermahlung von Quarzsand und einem Primärkarbonat hergestellt worden ist.5. The method according to one or more of claims 1 to 4, d a d It is not stated that a sand component is added which by joint grinding of quartz sand and a primary carbonate has been made. 6. Verfahren nach Anspruch 5, d a d u r c h g e k e n n -z &% i i c h n e t, daß eine Sandkomponente verwendet wird, die aus 85-95 Gew.-% SiO2 und 15-5 Gew.- Dolomit besteht.6. The method according to claim 5, d a d u r c h g e k e n n -z &% i c h e t that a sand component is used which consists of 85-95% by weight SiO2 and 15-5 wt. dolomite. 7. Verfahren nach Anspruch 6, d a d u r c h g e k e n n -z e i c h n e t, daß eine Sandkomponente verwendet wird, die durch 1-2 -stündige gemeinsame Vermahlung hergestellt worden ist und nach der Vermahlung die folgende Kornanalyse aufweist: >0,09 mm 24,1 Gew.-% 0,09 - 0,063 mm 9,2 Gew.-% 0,063-0,045 mm 9,8 Gew.-% < 0,045 56,9 Gew.-%7. The method according to claim 6, d a d u r c h g e k e n n -z e i c h n e t that a sand component is used, which is common through 1-2 -hour Grinding has been established and after grinding the following grain analysis has:> 0.09 mm 24.1% by weight 0.09-0.063 mm 9.2% by weight 0.063-0.045 mm 9.8 % By weight <0.045 56.9% by weight
DE19772744365 1977-10-01 1977-10-01 Gas concrete, made from line, cement and sand - where dolomite is added to lower reaction temp. Withdrawn DE2744365A1 (en)

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DE19772744365 DE2744365A1 (en) 1977-10-01 1977-10-01 Gas concrete, made from line, cement and sand - where dolomite is added to lower reaction temp.

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Application Number Priority Date Filing Date Title
DE19772744365 DE2744365A1 (en) 1977-10-01 1977-10-01 Gas concrete, made from line, cement and sand - where dolomite is added to lower reaction temp.

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DE2744365A1 true DE2744365A1 (en) 1979-04-05
DE2744365B2 DE2744365B2 (en) 1979-05-31

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3735245A1 (en) * 1987-04-23 1989-05-03 Hoelter Heinz Dry gas purification to remove acidic pollutants such as SO3, SO2, HF, HCl and NOx by means of alkali-impregnated lime/aluminium cement silicates as sorbents
AT388369B (en) * 1981-12-16 1989-06-12 Ytong Ag METHOD FOR PRODUCING POROUSES, GRANULES USED FOR INDUSTRIAL PURPOSES AND USE OF SUCH GRANULES
EP2824086B1 (en) 2013-07-12 2016-11-09 Xella Baustoffe GmbH Hydrothermally hardened porous or foamed concrete material and process for its production

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU587636B2 (en) * 1985-10-01 1989-08-24 Sumitomo Metal Mining Company Limited Process for producing autoclaved light weight aerated concrete
DE3912251A1 (en) * 1989-04-14 1990-10-18 Ortlepp Wolfgang Low shrinkage building material - contg. additive evolving gas at elevated temp.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT388369B (en) * 1981-12-16 1989-06-12 Ytong Ag METHOD FOR PRODUCING POROUSES, GRANULES USED FOR INDUSTRIAL PURPOSES AND USE OF SUCH GRANULES
DE3735245A1 (en) * 1987-04-23 1989-05-03 Hoelter Heinz Dry gas purification to remove acidic pollutants such as SO3, SO2, HF, HCl and NOx by means of alkali-impregnated lime/aluminium cement silicates as sorbents
EP2824086B1 (en) 2013-07-12 2016-11-09 Xella Baustoffe GmbH Hydrothermally hardened porous or foamed concrete material and process for its production
EP3100991A1 (en) * 2013-07-12 2016-12-07 Xella Baustoffe GmbH Method of preparing a hydrothermally cured pore or foam concrete mould
EP3100991B1 (en) 2013-07-12 2017-09-13 Xella Baustoffe GmbH Method of preparing a hydrothermally cured pore or foam concrete mould

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