EP1521727A1 - Procede de production de beton cellulaire - Google Patents

Procede de production de beton cellulaire

Info

Publication number
EP1521727A1
EP1521727A1 EP03735664A EP03735664A EP1521727A1 EP 1521727 A1 EP1521727 A1 EP 1521727A1 EP 03735664 A EP03735664 A EP 03735664A EP 03735664 A EP03735664 A EP 03735664A EP 1521727 A1 EP1521727 A1 EP 1521727A1
Authority
EP
European Patent Office
Prior art keywords
mixture
aerated concrete
water
burnt lime
temperature
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Withdrawn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
EP03735664A
Other languages
German (de)
English (en)
Inventor
Horst Lohrmann
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1521727A1 publication Critical patent/EP1521727A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
    • 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 invention relates to a method for producing aerated concrete and in particular to a method which allows better control of the porosity process and thus the production of aerated concrete of low bulk density with increased compressive strength.
  • the starting materials usually quicklime (fine lime), cement, ground quartz-containing sand, water and a pore former such as aluminum powder, optionally in the presence of other additives such as anhydride (calcium sulfate) - are short in a defined sequence placed successively in a mixer and mixed within a total mixing time of a few minutes.
  • quicklime fine lime
  • cement ground quartz-containing sand
  • water a pore former
  • a pore former such as aluminum powder
  • the mixture temperature rises steadily due to the strongly exothermic reaction of the quicklime with water and, depending on the recipe, reaches values of around 75 to 95 ° C.
  • the mixture increasingly stiffens, both through the binding of free water to the calcium oxide of quicklime and through the formation of highly dispersed hydrated lime. Cement in the mixture delays the lime and aluminum reaction.
  • the solidifying effect in the mixture only begins noticeably later, when the porosity has already taken place.
  • One of the goals here is to achieve a certain sawing maturity of the mixture at a desired point in time.
  • the formation of gas is particularly critical for the aerated concrete in the early phase of lime hydration, because no stable phase boundaries have yet been formed and therefore a diffuse gas distribution leads to the finest pores in the entire casting compound, which impairs the strength of the later solid framework.
  • the blowing height achieved is often not stable, especially with very light aerated concrete, for example the bulk density class 0.40 according to DIN 4165, with dry bulk densities between 0.35 and 0.40 kg dm 3 , because gas blows out and the mass up to several percent the total height coincides. This increases the bulk density again.
  • the fluctuations in the consistency of the casting compound during the porosity process are also problematic for the blowing process.
  • the change in consistency from the initially low consistency of the mixture to high consistency at the end of the blowing process like the constant rise in temperature, forces the aluminum powder to be overdosed in order to achieve the desired blowing height.
  • the consequence of overdosing is gas outbreaks, falling back of the mass, structural disorders and quality defects.
  • the water content is usually as high as possible selected for the mixture (with water solids values around 0.6) in order to be able to carry out the porosity with the lowest possible consistency values.
  • the result is an increase in the capillary pores in the solid framework and a decrease in the strength of the hardened aerated concrete.
  • the process according to the invention differs from the processes of the prior art in that the burnt lime is first of all completely extinguished with water before the pore former is added to the mixture for producing the aerated concrete.
  • the procedure according to the invention leads to the fact that the hydration of lime and the formation of the highly disperse hydrated lime have already been essentially completed before the pore former is added.
  • lime hydration takes place at the same time as the driving process.
  • the progressive crystallization of the successive lime hydrate leads to new tooth structures, especially in the later stage of lime hydration.
  • a so-called tempering value becomes effective rheologically; a certain additional force is therefore required for pore enlargement to take place.
  • the solid-liquid system therefore has a different constitution and thus a different internal structure of the system from solid particles and water than is the case in the mortar system of the method according to the invention.
  • the process according to the invention there are constant conditions for the formation of the phase boundaries between the solid-liquid system on the one hand and the gas phase on the other hand for pore formation over the entire porosity process.
  • the highly disperse lime hydrate which is essentially completely available from the start, in cooperation with the surface tension of the water.
  • the pores are formed with a constant consistency of the mixture. Every change in the raw materials and the recipe therefore has clear effects on the porosity, so that there are targeted control options via the composition of the mixture.
  • the porosity process can be carried out at a substantially constant temperature.
  • the method according to the invention can be carried out in such a way that the temperature fluctuation during pore formation is only a maximum of approximately ⁇ 2 ° C. .
  • the intensity of the gas formation depends solely on the pore former and its specific surface and can also be influenced in a targeted manner by setting the temperature of the mixture to a suitable temperature during the pore formation.
  • the desired increase in volume of the mixture is practically proportional to the dosage of the aluminum powder.
  • the porosity can be carried out with a high consistency of the mixture.
  • the water contents or the water-solids values can therefore be significantly lower than the previously practicable values.
  • the strength of the finished, steam-hardened aerated concrete increases accordingly.
  • 0.30 to 0.40 water / solids values of 0.40 to 0.55 and in particular 0.45 to 0.55 can be achieved, while values in the known processes are in use by 0.6.
  • Significantly higher compressive strengths are achieved than was previously possible in the prior art.
  • aerated concretes can be produced by the process according to the invention, which have a compressive strength of at least 2.0 N / mm 2 with a dry bulk density according to DIN 4165 of 0.30 or 0.35 kg dm 3 . So far, about 1.6 N / mm 2 was possible here. While in the prior art for the bulk density class 0.40 DIN 4165 compressive strengths of approximately 2.0 N / mm 2 have been achieved to date, the method according to the invention achieves compressive strengths of at least 2.5 N / mm 2 here .
  • pore formers and blowing agents customary in the prior art can be used as pore formers in the process according to the invention.
  • Aluminum is particularly suitable, for example in the form of aluminum powder or aluminum paste. Passivated aluminum is particularly preferred, the reactivity of which is sufficiently slowed down in order to be able to carry out the driving process under particularly constant conditions. Because of the constant conditions in the course of the porosity, however, other pore formers such as foaming agents can also be used in the process according to the invention.
  • the same starting materials can be used in the process according to the invention that have been used up to now in the production of aerated concrete.
  • the mixture used in the process according to the invention can contain further additives customary in the production of aerated concrete, such as cement and / or anhydrite. Cement in the mixture serves to stiffen the mass until it is ready for sawing and is used in such a way that the strengthening effect only begins to be noticeable after the driving process has been completed.
  • Return material that is, uncured material recovered from the production of cellular concrete, can also be added to the mixture.
  • the advantage of this procedure is that the water contained in the return material can be taken into account in the amount of water required to extinguish the quicklime, and so the amount of water in the mortar is not greater than necessary.
  • the temperature of the premix produced increases due to the exothermic reaction of the components. If the quicklime has been extinguished with water either alone or only in the presence of the return material, the temperature in the suspension drops again by mixing in the other components such as cement or anhydrite.
  • the process according to the invention is preferably carried out in such a way that the porosity process can take place at a temperature between 60 and 90 ° C. and in particular between 70 and 85 ° C.
  • the temperature of the mixture In the finished mixture, which contains all components including the pore former, the temperature practically no longer changes during the porosity process.
  • the temperature of the mixture remains constant in a maximum of ⁇ 2 ° C until the end of the porosity.
  • the porosity can be carried out from the start in a mixture of flowable or plastic consistency.
  • the water content in the mixture is preferably 40 to 60% by mass, in particular 45 to 55% by mass, of the solid starting materials.
  • the porosity process itself takes place in a manner known per se in casting molds, into which the mixture to be porosified is expediently introduced as a flowable, self-mollifying suspension.
  • the further process steps, including the steam hardening of the aerated concrete, are also carried out in a manner known per se in the prior art.
  • the process according to the invention can readily be carried out using the devices and equipment which have hitherto been customary in the production of aerated concrete.
  • Existing devices for the production of aerated concrete can continue to be used.
  • they are preceded only by a pre-mixer in which the quicklime is extinguished in accordance with the method according to the invention.
  • the still hot premix is then transferred to a main mixer in order to be mixed there with the remaining constituents of the mixture and then to be processed further in a generally customary manner.
  • the ingredients are mixed in with the other commonly used ingredients Dosing. If only one pre-mixer is used to extinguish the quicklime, the method according to the invention is carried out intermittently. Further processing depends on the reaction time of the quicklime during the extinguishing process.
  • premixers for the upstream hydration of the quicklime, in which the quicklime is removed at different times.
  • the number of premixers required depends on the hydration time of the quicklime, which is usually about 12 to 20 minutes, and the pouring rhythm of the production can also be taken into account.
  • the process can be carried out particularly efficiently if the premix is passed into the main mixing cycle before the maximum quenching temperature is reached. However, care must be taken to avoid agglomeration of the lime hydrate formed and an excessive reduction in the dispersity of the mixture.
  • the temperature differences ⁇ T relate to the heating that the components of quicklime (Brk), water (W) and, if applicable, return material, which have been mixed together at ambient temperature, have experienced after the extinguishing process has been completed.
  • the temperature difference relates to the temperature increase of the other feed materials by adding the hot premix. After the mixing process has been completed, the temperature of the mixture remains constant during the porosity within an interval of ⁇ 2 ° C.
  • Concrete 0.30 denotes a cellular concrete with a dry bulk density according to DIN 4165 of 0.30 kg / dm 3 .
  • the degree of purity of the aluminum powder used must also be taken into account
  • the demand is given in the form of a basic value and a factor.
  • the basic value gives the gas volume at reaction temperature and atmospheric pressure, corresponding to the required volume increase of the mixture.
  • the factor takes into account the consistency of the mixture, its average load on the pore and the enlargement of the pores against atmospheric pressure. The factor can only be estimated and is to be determined empirically.

Landscapes

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

Abstract

L'invention concerne un procédé de production de béton cellulaire à partir d'un mélange comprenant du sable quartzeux et/ou de la poudre de roche quartzifère, un liant contenant de la chaux vive, de l'eau et un agent porogène, ainsi qu'éventuellement du ciment et/ou de l'anhydrite. Selon l'invention, la chaux vive est éteinte avec de l'eau sensiblement totalement avant que l'agent porogène soit ajouté au mélange. De cette manière, la formation de pores peut avoir lieu dans un mélange présentant une température et une consistance constantes. Le procédé selon l'invention permet d'obtenir des résultats de formation de pores présentant une haute reproductibilité, ainsi qu'un béton cellulaire présentant une densité apparente à sec particulièrement faible tout en possédant une haute résistance à la compression.
EP03735664A 2002-07-16 2003-06-23 Procede de production de beton cellulaire Withdrawn EP1521727A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2002132180 DE10232180B4 (de) 2002-07-16 2002-07-16 Verfahren zur Herstellung von Porenbeton
DE10232180 2002-07-16
PCT/EP2003/006593 WO2004007393A1 (fr) 2002-07-16 2003-06-23 Procede de production de beton cellulaire

Publications (1)

Publication Number Publication Date
EP1521727A1 true EP1521727A1 (fr) 2005-04-13

Family

ID=30010049

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03735664A Withdrawn EP1521727A1 (fr) 2002-07-16 2003-06-23 Procede de production de beton cellulaire

Country Status (4)

Country Link
EP (1) EP1521727A1 (fr)
AU (1) AU2003238027A1 (fr)
DE (1) DE10232180B4 (fr)
WO (1) WO2004007393A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008017251B9 (de) † 2008-04-04 2009-11-26 Xella Technologie- Und Forschungsgesellschaft Mbh Verfahren zur Herstellung von Porenbeton und Schaumbeton sowie Anlage zur Durchführung des Verfahrens
WO2013044324A1 (fr) * 2011-09-30 2013-04-04 Hyssil Pty Ltd Produit
CN102910889B (zh) * 2012-11-06 2014-02-12 华虹集团宜兴市华虹新型墙体建筑材料有限公司 一种含有江河淤泥沙的加气混凝土墙材及其制备方法
CN109455997A (zh) * 2018-11-20 2019-03-12 许昌学院 一种水泥基泡沫砌块及其制备方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB593870A (en) * 1945-06-18 1947-10-28 Norman Victor Sydney Knibbs Improvements in or relating to the production of cellular artificial stone
DE447194C (de) * 1924-03-17 1927-07-19 Johan Axel Eriksson Verfahren zur Herstellung von poroesen Baustuecken aus Beton
GB751868A (en) * 1953-04-13 1956-07-04 Skoevde Gasbetong Aktiebolag Improvements relating to the manufacture of building materials of the concrete type
JPH0631176B2 (ja) * 1986-04-18 1994-04-27 住友金属鉱山株式会社 水蒸気養生軽量気泡コンクリ−トの製造方法
SU1539190A1 (ru) * 1986-10-22 1990-01-30 Проектный и научно-исследовательский институт "Уральский промстройниипроект" Способ подготовки быстрогас щейс извести дл приготовлени газобетонной смеси
EP0428756B1 (fr) * 1989-06-06 1994-05-25 Asahi Glass Company Ltd. Procede de production de beton-mousse cellulaire
JP2875838B2 (ja) * 1990-01-31 1999-03-31 住友金属鉱山株式会社 ゾノトライト系軽量珪酸カルシウム水和物成形体の製造方法
GB9027601D0 (en) * 1990-12-20 1991-02-13 Thermalite Limited Fibre-reinforced materials
DE4339137A1 (de) * 1993-06-08 1994-12-15 Sicowa Verfahrenstech Verfahren zur Herstellung von Wärmedämmaterial
DE4327074A1 (de) * 1993-08-12 1995-02-16 Dennert Kg Veit Verfahren zur Herstellung einer mineralischen Leicht-Dämmplatte
DE19619263C2 (de) * 1996-05-13 2001-04-19 Ytong Ag Verfahren zur Herstellung von Leichtbaustoffen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004007393A1 *

Also Published As

Publication number Publication date
DE10232180B4 (de) 2007-11-22
WO2004007393A1 (fr) 2004-01-22
AU2003238027A1 (en) 2004-02-02
DE10232180A1 (de) 2004-02-05

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