EP1904419A2 - Utilisation d'un additif organique destine a la production de beton alveole - Google Patents

Utilisation d'un additif organique destine a la production de beton alveole

Info

Publication number
EP1904419A2
EP1904419A2 EP06754731A EP06754731A EP1904419A2 EP 1904419 A2 EP1904419 A2 EP 1904419A2 EP 06754731 A EP06754731 A EP 06754731A EP 06754731 A EP06754731 A EP 06754731A EP 1904419 A2 EP1904419 A2 EP 1904419A2
Authority
EP
European Patent Office
Prior art keywords
additive
porous concrete
aerated concrete
use according
water
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Withdrawn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
EP06754731A
Other languages
German (de)
English (en)
Inventor
Bernhard Sturm
Konrad Wutz
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.)
Construction Research and Technology GmbH
Original Assignee
Construction Research and Technology 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 Construction Research and Technology GmbH filed Critical Construction Research and Technology GmbH
Publication of EP1904419A2 publication Critical patent/EP1904419A2/fr
Withdrawn legal-status Critical Current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
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
    • 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 present invention is the new use of a per se known organic additive in the production of aerated concrete.
  • Aerated concrete (previously also referred to as gas concrete) is a relatively lightweight, porous and mineral building material based on lime, lime cement or cement mortar, which is generally subjected to a steam hardening.
  • aerated concrete is not such a material because it contains no aggregates.
  • Aerated concrete is characterized by a large amount of large-volume air pores and is mainly produced from the raw materials quicklime, cement and quartz sand.
  • the finely ground sand (quartz powder), which can be replaced by fly ash in certain proportions, together with quicklime and cement in a ratio of 1: 1: 4 with the addition of water to a typical mortar mixture.
  • a small amount of aluminum powder is stirred into this finished suspension and this mortar mix is poured into trays. There develops due to the proportions of metallic, finely divided aluminum in the alkaline mortar suspension hydrogen gas, creating numerous small gas bubbles, which foam the slowly stiffening mixture.
  • the bulk density of aerated concrete can be adjusted within wide limits, the usual products having densities of less than 350 kg / m 3 to 750 kg / m 3 . Due to its low density in comparison with conventional concrete, aerated concrete has a low strength but a low thermal conductivity, which results in an excellent thermal insulation effect.
  • the actual aerated concrete production is characterized by two main reaction phases: In the first phase, the so-called green aerated concrete is produced and brought to the cutable green strength. Due to the components lime and cement, exothermic reactions take place within the framework of the KaIk (CaO) hydration, which together with other reactions leads to a stiffening of the dispersion. The course of the stiffening can last from just a few minutes for lime-rich recipes up to six hours for low-lime and at the same time cement-rich formulations. The rate of stiffening is mainly determined by the proportion of lime in the recipe, the total binder content, the water / solids value, the temperature and the temperature development, the alkalinity of the lime or cement and possibly other binders and finally the desired bulk density.
  • the hardening of the cake-resistant raw material takes place.
  • this second phase is carried out in autoclaves under hydrothermal pressure conditions, whereby silicate components are dissolved, which react with the likewise dissolved CaO to form various calcium silicate hydrate phases until the lime components (CaO) have been used up.
  • the lime components CaO
  • the already dissolved calcium silicate hydrate phases form further and very SiO 2 -rich phases.
  • the aerated concrete components produced in this way can, like reinforced concrete parts, have a reinforcement in order to be able to absorb tensile forces.
  • the most well-known aerated concrete components are prefabricated components that are used as wall, ceiling and roof panels and ensure high thermal insulation. Aerated concrete is also used in the form of bricks and other prefabricated components, which are characterized by an extremely low density. The easy and versatile machinability of the cellular concrete material makes it particularly suitable for use in individual interior design.
  • the known aerated concrete production processes are very energy-intensive processes, not least due to the second reaction phase, namely the autoclave phase.
  • Additives which have a positive effect on the processability of building chemical compositions and / or the properties of the products which can be produced therewith are well known. Reference may be made at this point to additives for hydraulically curing materials such as concretes, mortars and gypsum compositions, as described, for example, in DE 44 34 010 C2, DE-OS 20 49 114, EP-A 214 412, DE-PS 16 71 017, EP 0 736 553 B1 and EP 1 189 955 B1, which are substantive components of this disclosure with regard to the compounds mentioned there as additives in each case.
  • the object of the present invention was to provide a new additive with which aerated concrete with at least the previously known excellent properties can be produced, with the aid of which, however, the standard Manufacturing process can also be carried out significantly cheaper.
  • This object was achieved by the use of an organic additive with water-reducing, dispersing and / or flowability-increasing properties for the production of aerated concrete.
  • the production process for aerated concrete with respect to the associated energy expenditure can be carried out significantly cheaper, as by the water-reducing, dispersing and / or flowability enhancing properties of the organic additives used above all lower amounts of water can be used.
  • the second reaction phase in particular, ie the autoclave process is thereby positively influenced, since now smaller amounts of water have to be removed from the starting material with a green strength, which of course is associated with a lower expenditure of energy.
  • the foaming process and the pore distribution are overall more homogeneous and the cell structure of the pores is also more uniform.
  • the use according to the invention is distinguished in particular by a preferred additive which is at least one member of the series of polycondensation products based on naphthalene or alkylnaphthalenesulfonic acids, sulfonic acid-containing melamine-formaldehyde resins and copolymers based on unsaturated mono- or dicarboxylic acid.
  • a preferred additive which is at least one member of the series of polycondensation products based on naphthalene or alkylnaphthalenesulfonic acids, sulfonic acid-containing melamine-formaldehyde resins and copolymers based on unsaturated mono- or dicarboxylic acid. Derivatives and oxyalkylene glycol alkenyl ethers.
  • Particularly suitable additives according to the invention are condensation products which are present in the form of salts of water-soluble naphthalenesulfonic acid-formaldehyde condensates.
  • the molar ratio between formaldehyde and naphthalenesulfonic acid should be 1: 1 to 10: 1, more preferably 1.1: 1 to 5: 1, and most preferably 1.2: 1 to 3: 1.
  • Typical amino s-triazines are melamine and guanamines, such as. B. benzoic or acetoguanamine.
  • condensation products and suitable processes for their preparation reference may be made in particular to DE 44 34 010 C2, which is a substantial part of this disclosure.
  • Preferred additives within the meaning of the present invention provide i.a. Compounds which contain at least 2, but preferably 3 and more preferably 4 of the groups a), b), c) and d).
  • the first component a) represents a mono- or dicarboxylic acid derivative having the general formula Ia, Ib or Ic.
  • R 1 is hydrogen or an aliphatic hydrocarbon radical having 1 to 20 C atoms, preferably 1 to 10 C atoms, and most preferably a methyl group.
  • X 1 in the structures Ia and Ib is - OM 1 a and / or - O - (C m H 2m O) n - R 2 or - NH - (C m H 2m O) n - R 2 having the following meaning for M 1 , a, m, n and R 2 :
  • organic amine radicals are preferably substituted ammonium groups are used which are derived from primary, secondary or tertiary Ci -20 alkyl amines, C -20 - alkanolamines, Cs- ⁇ -cycloalkylamines and Ce-u-aryl amines.
  • Examples of the corresponding amines from which these radicals are derived are Methylamine, dimethylamine, trimethylamine, ethanolamine, diethanolamine, triethanolamine, methyldiethanolamine, cyclohexylamine, dicyclohexylamine, phenylamine, diphenylamine in the protonated (ammonium) form.
  • Sodium, potassium, calcium and magnesium are M 1 preferred monovalent or divalent metal ions.
  • the aliphatic hydrocarbons may hereby be linear or branched and saturated or unsaturated.
  • Preferred cycloalkyl radicals are cyclopentyl or cyclohexyl radicals, phenyl or naphthyl radicals which are preferred as aryl radicals, which radicals may in particular be substituted by hydroxyl, carboxyl or sulfonic acid groups.
  • the second module b) corresponds to formula II - CH 2 - CR 3 -
  • R 3 in turn represents hydrogen or an aliphatic hydrocarbon radical having 1 to 5 C atoms, which may also be linear or branched or unsaturated, p may assume values between 0 and 3.
  • m 2 and / or 3, so that they are polyalkylene oxide groups which are derived from polyethylene oxide and / or polypropylene oxide.
  • p in formula II is 0 or 1, ie it is vinyl and / or allyl polyalkoxylates.
  • the third module c) corresponds to the formula IIIa or IHb
  • R 4 can be H or CH 3 , depending on whether it is acrylic or methacrylic acid derivatives.
  • S 1 can be -H, -COOM 1 a or -COOR 5 , where a and M 1 have the abovementioned meaning and R 5 is an aliphatic hydrocarbon radical having 3 to 20 C atoms, a cycloaliphatic hydrocarbon radical having 5 to 8 C atoms. Atoms or an aryl radical having 6 to 14 carbon atoms.
  • the aliphatic hydrocarbon radical may also be linear or branched, saturated or unsaturated.
  • the preferred cycloaliphatic hydrocarbon radicals are again cyclopentyl or cyclohexyl radicals and the preferred aryl radicals are phenyl or naphthyl radicals.
  • T 1 - COOR 5
  • S 1 COOM a or - COOR 5
  • assemblies c) may have other hydrophobic structural elements. These include the Polypropylenoxid lesser. Polypropylene oxide-polyethylene oxide derivatives with
  • T 1 - U 1 - (CH - CH 2 - O) x - (CH 2 - CH 2 - O) y - R 6
  • x assumes a value of 1 to 150 and y of 0 to 15.
  • U 1 - CO - NH -, - O - or - CH 2 - O - may be.
  • R 6 can in this case again R 2 (meaning of R 2 see above) or
  • U 2 - NH - CO -, - O -, or - OCH 2 - may mean and S 1 has the meaning described above.
  • These compounds are polypropylene oxide (polyethylene oxide) derivatives of the bifunctional alkenyl compounds corresponding to formula IIIa.
  • R 7 R 2 and r can here assume values of 2 to 100.
  • the polydimethylsiloxane grouping can not only be bonded directly to the ethylene radical of formula IIIa but also via the groupings
  • R 4 S 1 R 4 S 1 mean.
  • the fourth component d) is derived from an unsaturated dicarboxylic acid derivative of the general formula IVa and / or IVb - CH CH - CH CH
  • Typical representatives of this unsaturated dicarboxylic acid derivative are derived from maleic acid, fumaric acid and their monovalent or divalent metal salts, such as.
  • the copolymers contain from 51 to 95 mol% of structural groups of the formula Ia and / or Ib and / or Ic, from 1 to 48.9 mol% of structural groups of the formula II, from 0.1 to 5 mol% Assemblies of the formula IHa and / or IMb and 0 to 47.9 mol% of groups of the formula IVa and / or IVb.
  • the additive used according to the invention preferably comprises the components a) and b) and optionally c).
  • the additive in the form of a copolymer particularly preferably contains 55 to 75 mol% of structural groups of the formula Ia and / or Ib, 19.5 to 39.5 mol% of structural groups of the formula II, 0.5 to 2 mol% of structural groups of the formula purple and / or MIb and 5 to 20 mol% of the groups of the formula IVa and / or IVb.
  • the additive used according to the invention in the form of a copolymer additionally contains up to 50 mol%, in particular up to 20 mol% based on the sum of the components of the formulas I, II, III and IV, structures based on monomers based on vinyl or (meth) acrylic acid derivatives such as styrene, ⁇ -methylstyrene, vinyl acetate, vinyl propionate, ethylene, propylene, isobutene, hydroxyalkyl (meth) acrylates, acrylamide, methacrylamide, N-vinylpyrrolidone, allylsulfonic acid, methallylsulfonic acid, vinylsulfonic acid, Vinylphosphonic acid, AMPS, methyl methacrylate, methyl acrylate, butyl acrylate, allylhexyl acrylate, etc. based.
  • acrylic acid derivatives such as styrene, ⁇ -methylstyrene, vinyl acetate, vinyl propionate,
  • the number of repeating structural units in each copolymer used is not limited. As a particularly advantageous however, it has been found to set average molecular weights of 500 to 1,000,000, more preferably 1,000 to 100,000 g / mole.
  • the present particular use is characterized in particular by the fact that the respective additive is added to a cellular concrete base mixture containing lime, a hydraulic binder, preferably in the form of cement, sand, and in particular quartz sand, and optionally other components of the series anhydrite and fly ash ,
  • the aerated concrete base mixture may of course also contain other components and additives depending on the particular application, although the composition of the aerated concrete base mixture does not adversely affect the claimed use of the organic additives described.
  • An essential role in the production of aerated concrete plays the gas-evolving component, which is predominantly aluminum powder in the majority.
  • the use according to the invention of the organic additive is by no means limited to a specific time of addition. This means that the additive according to the present invention can be used both in the first main reaction phase, that is to say the production of the green-strength-proof matrix, and immediately before the onset of gas evolution.
  • the present invention provides as a preferred variant, the addition of the additive to an aerated concrete base, which already contains the gas-evolving component, and preferably aluminum powder.
  • the addition amount of the additive is not subject to any actual restriction in the present case. Only the goal, which is pursued with the addition of the organic additive, and economic aspects are expected to have a limiting effect on the added amount. For this reason, the present invention contemplates that the additive preferably contains the non-foamed and, in particular, make-up-water-free aerated concrete base compound in amounts between 0.01 and 10 wt.% And preferably in amounts between 0.1 and 5 wt.% And most strongly preferably in an amount between 0.2 and 1, 0 wt .-%, each based on the weight of the mineral binder is added.
  • the additive can be used in the context of the present invention both in the solid and in the liquid state. However, since liquid phases are preferred in the majority of cases in the production of aerated concrete, it is recommended that the additives mentioned also be used in liquid form and the mixture of raw materials thus obtained subsequently mixed together.
  • Bulk density of ⁇ 1 000 kg / m 3 preferably between 300 and 700 kg / m 3 and particularly preferably between 350 and 550 kg / m 3 , have.
  • the raw materials were weighed on a digital laboratory balance with an accuracy of +/- 0.05 g.
  • the temperature of the feedwater was adjusted to 4O 0 C prior to addition to the mixer.
  • the raw materials were combined in the following mixing order:
  • Table 2 shows the water-reducing effect for different types of condenser added according to the invention compared to a mixture without additive. The consistency of the raw mixture with condenser additive is increased at the clearly low water values. Table 2:
  • VWTrM ratio of water - dry mortar
  • Melment ® is trademarks of Degussa Construction Polymers GmbH.
  • the last column of Table 2 shows the gross densities of the cellular concrete mass after foaming.

Landscapes

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

Abstract

L'invention concerne la production de béton alvéolé. A cet effet, on utilise un additif organique réducteur d'eau, dispersif et/ou aux propriétés augmentant la fluidité. Cet additif est au moins un représentant de la série des produits de polycondensation à base d'acides de naphthaline ou d'alkylnaphthalinsulfonique, de résines mélanine-formaldéhyde contenant des groupes d'acide sulfonique ainsi que de copolymères à base de dérivés d'acide monocarboxylique ou dicarboxylique insaturés et d'éthers d'oxyalkylenglycol-alcényle. On ajoute à cet additif est, de préférence, un mélange de base de béton alvéolé non expansé et notamment exempt d'eau de gâchage, ce mélange contenant de la chaux, un liant hydraulique, de préférence du ciment et du sable. Des quantités comprises entre 0,01 et 10 % en poids étant préférées. Cette utilisation permet de réaliser le procédé de production de béton alvéolé de manière nettement favorable en termes d'énergie et donc avec une grande rentabilité, les propriétés typiques des produits de béton alvéolé n'étant pas influencées négativement.
EP06754731A 2005-07-18 2006-07-17 Utilisation d'un additif organique destine a la production de beton alveole Withdrawn EP1904419A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510033454 DE102005033454A1 (de) 2005-07-18 2005-07-18 Verwendung eines organischen Additivs zur Herstellung von Porenbeton
PCT/EP2006/007024 WO2007009732A2 (fr) 2005-07-18 2006-07-17 Utilisation d'un additif organique destine a la production de beton alveole

Publications (1)

Publication Number Publication Date
EP1904419A2 true EP1904419A2 (fr) 2008-04-02

Family

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Family Applications (1)

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EP06754731A Withdrawn EP1904419A2 (fr) 2005-07-18 2006-07-17 Utilisation d'un additif organique destine a la production de beton alveole

Country Status (5)

Country Link
US (1) US20090209682A1 (fr)
EP (1) EP1904419A2 (fr)
JP (1) JP2009501692A (fr)
DE (1) DE102005033454A1 (fr)
WO (1) WO2007009732A2 (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
DE102010009373A1 (de) * 2010-02-25 2011-08-25 SRZ Schutzrechte Verwaltungs-GmbH, 90571 Zusammensetzung eines Formkörpers zur Verwendung als Dämmplatte, Verfahren zu seiner Herstellung sowie Dämmplatte
DE102010013667C5 (de) 2010-04-01 2013-05-29 Xella Technologie- Und Forschungsgesellschaft Mbh Porenbetonformkörper sowie Verfahren zu seiner Herstellung
DE102016106642A1 (de) * 2016-04-11 2017-10-12 MegaPore R&D GmbH Verfahren zur Herstellung von Porenbetonformkörpern

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Also Published As

Publication number Publication date
DE102005033454A1 (de) 2007-01-25
WO2007009732A3 (fr) 2007-04-19
US20090209682A1 (en) 2009-08-20
JP2009501692A (ja) 2009-01-22
WO2007009732A2 (fr) 2007-01-25

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