EP1521727A1 - Procede de production de beton cellulaire - Google Patents
Procede de production de beton cellulaireInfo
- 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- Withdrawn
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
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)
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)
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 |
-
2002
- 2002-07-16 DE DE2002132180 patent/DE10232180B4/de not_active Expired - Fee Related
-
2003
- 2003-06-23 EP EP03735664A patent/EP1521727A1/fr not_active Withdrawn
- 2003-06-23 WO PCT/EP2003/006593 patent/WO2004007393A1/fr not_active Application Discontinuation
- 2003-06-23 AU AU2003238027A patent/AU2003238027A1/en not_active Abandoned
Non-Patent Citations (1)
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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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20041006 |
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AK | Designated contracting states |
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AX | Request for extension of the european patent |
Extension state: AL LT LV MK |
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17Q | First examination report despatched |
Effective date: 20050428 |
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DAX | Request for extension of the european patent (deleted) | ||
RBV | Designated contracting states (corrected) |
Designated state(s): BE CZ DE FR SE |
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17Q | First examination report despatched |
Effective date: 20050428 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20090101 |