EP2760653B1 - Rocédé de fabrication d'éléments avec une surface et une zone périphérique du béton de haute valeur qualitative - Google Patents

Rocédé de fabrication d'éléments avec une surface et une zone périphérique du béton de haute valeur qualitative Download PDF

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Publication number
EP2760653B1
EP2760653B1 EP12778610.1A EP12778610A EP2760653B1 EP 2760653 B1 EP2760653 B1 EP 2760653B1 EP 12778610 A EP12778610 A EP 12778610A EP 2760653 B1 EP2760653 B1 EP 2760653B1
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EP
European Patent Office
Prior art keywords
concrete
shuttering
backing layer
water
matrix
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EP12778610.1A
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German (de)
English (en)
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EP2760653A1 (fr
Inventor
Gerhard Horstmann
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H Bau Technik GmbH
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H Bau Technik GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
    • B28B7/384—Treating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/36—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article
    • B28B7/368—Absorbent linings

Definitions

  • the invention relates to a method for applying an agent on the formwork surface of a concrete formwork for the production of concrete components with a high-quality concrete edge zone.
  • the concrete surface as a visible surface is of overriding importance. Their optical quality depends primarily on the color uniformity, the surface texture and the porosity. Influencing factors on these factors are, in addition to the concrete recipe and the processing of the concrete, above all the formwork and the release agent used. These significantly influence the concrete structure in the concrete edge zone and thus not only the strength, but also the optical quality of the concrete surface.
  • Concrete basically consists of three components, namely a hydraulic binder, mineral aggregates and water.
  • the water-cement value plays a key role. If the concrete has too little water, the hydration can not be complete. Is more Water present as necessary for hydration, so the excess mixing water leads to increased pore formation and strength losses.
  • the quality of the concrete edge zone is essentially determined by the interaction of the concrete, the formwork and the release agent.
  • the concrete has less aggregate, while the proportion of cement paste is increased.
  • a non-absorbent formwork such as a formwork made of steel or plastic
  • the excess mixing water can not diffuse into the formwork.
  • an increased water content and thus increased water-cement value This leads to a lower concrete strength and an increased pore content in this area with a tendency to sedimentation.
  • absorbent formwork such as wood or cardboard
  • water is extracted from the concrete edge zone and the water-cement value is lowered.
  • Powdered, water-insoluble hydrophilic polymers are for example from EP 1 329 435 A1 and the publication of Mechtcherine V. et al. "Internal curing by superabsorbent polymers (SAP) - VOLUME CHANGES OF HARDENING CONCRETE: TESTING AND MINI-GATION: INTERNATIONAL RILEM CONFERENCE; LYNGBY, DENMARK, AUGUST 20-23, 2006. PROCEEDINGS, August 20, 2006, (2006-08-20) pages 87-96 ,
  • the GB 976 133 A discloses a method for producing a concrete component by placing concrete in a formwork on which surface of the formwork facing the concrete is applied a means of a paper carrier layer coated with a hydrogel forming agent.
  • the hydrogel-forming agent / polymer is a mixture of starch and carboxymethyl cellulose or sodium alginate.
  • the US 3,941,864 A describes a method for producing a concrete component by introducing concrete into a formwork on which the concrete facing surface of Forming a dispersion of fine silica fume (hydrogel) and a curable organosilicon compound is applied.
  • the object of the present invention is to provide an alternative method for improving the quality of the concrete in the edge zone as well as on the component surface.
  • the invention is based on the idea of creating an optimal framework for the hydration of the concrete by an automatic regulation of the water-cement value and thus to improve the quality of the concrete edge zone. This is achieved according to the invention with the aid of a means which has as an essential component at least one hydrogel, which is applied flat on the concrete facing side of a formwork.
  • hydrogel is understood to mean water-insoluble polymers which are present as a three-dimensional network. These polymers also include so-called superabsorbents. In water, these polymers swell under retention of shape until an equilibrium state is reached. The networking takes place predominantly via covalent linkages of the polymers, but is also possible via electrostatic, hydrophobic or dipole / dipole interactions between individual segments of Poylmerketten. The necessary hydrophilicity of the polymers comes, inter alia, from hydroxyl, carboxylate, sulfonate or amide groups. By appropriate selection, the properties of the hydrogel can be adjusted.
  • the invention also encompasses synthetic hydrogels which are based, for example, on polyacrylic acids, polyacrylates, polycarboxyllates, polyvinylpyrrolidone or polyvinyl alcohol. Due to its ability to store water, hydrogel and thus the agent is able to absorb excess mixing water in the concrete with volume increase. The agent forms a full-surface dense film on the scarf surface. Should additional water be needed at a later date for complete hydration in the concrete rim zone, the hydrogel will be able to return stored water to the concrete. Because of these properties, the agent used in the process proves to be advantageous in two respects. On the one hand, the water content in the concrete edge zone is regulated and thus the local water-cement value.
  • the hydrogel has powdery consistency before it comes in contact with the concrete.
  • the application to a horizontal or vertical scarf surface is then advantageously by spraying, rolling or rubbing with a sponge, Flaps or the like, wherein by selecting the appropriate surface density of the order, the absorption capacity can be adjusted.
  • a preferred surface coverage of the hydrogel provides 1 g / m 2 to 10 g / m 2 .
  • the fixation of the hydrogel on the scarf surface is done according to a preferred embodiment of the invention by means of a carrier layer which is applied to the scarf surface and adheres there.
  • the support layer can cure after application of the hydrogel, whereby a particularly good and permanent fixation of the hydrogel takes place.
  • This alternative is preferred in scarf areas for single use, since the hardened carrier layer does not have to be removed from the scarf surface.
  • the support layer may also be formed by a viscous material, for example a polyol which immobilizes the hydrogel with its adhesive surface. Especially with scarf areas for repeated use, this alternative proves to be advantageous because the carrier layer can be easily removed from the scarf surface.
  • An advantageous embodiment of the invention also provides to arrange the carrier layer on a film or form itself as a film.
  • the film can then be applied as a disposable film on the formwork inside, where it comes into contact with the fresh concrete.
  • the film may be self-adhesive on its back.
  • the film also serves as protection for the formwork, which can be used again without further preparation for re-use in this way. Since the film is intended for single use, this embodiment is equally suitable for both hardenable carrier layers and viscous carrier layers.
  • the film is preferably made of PVC, polyethylene or polyurethane.
  • Suitable materials for a carrier layer according to the invention are, for example, clearcoats, resins, pressure-sensitive adhesives, polyurethanes and formaldehyde oils which are sprayed on in a liquid or viscous state.
  • StyrolButadien which is applied as an aqueous solution on the scarf surface is also suitable as a carrier layer. After evaporation of the aqueous portion, an adhesive layer for receiving the hydrogel remains.
  • a further embodiment provides for the use of an aqueous silicate solution as a carrier layer, for example based on biopolymers or Water glass, which additionally has a positive effect on the quality of the concrete surface in terms of a closed and dense structure.
  • the powdery hydrogel adheres to the surface of such carrier layers, where it absorbs mixing water in the region of the edge zone after introduction of the fresh concrete.
  • Another embodiment of the invention provides to embed the hydrogel in a matrix and apply both components together as a kind of dispersion on the scarf surface, which can also be done by spraying.
  • the weight-related mixing ratio of hydrogel to matrix is preferably in a range of 0.01 to 2.5.
  • Suitable materials for this purpose consist of resin, pressure-sensitive adhesive, polyol, formaldehyde oil or an aqueous styrene-butadiene solution.
  • the carrier layer or the matrix has hydrophobic properties.
  • the carrier layer or the matrix may consist of a hydrophobic material or have hydrophobic constituents or a hydrophobic layer, for example of a hydrophobic polyol or acrylate.
  • the hydrophobic properties ensure that the hydrogel does not prematurely absorb moisture and swell.
  • the concrete surface also obtains hydrophobic properties by crosslinking with the agent according to the invention, so that optionally a subsequent hydrophobic surface treatment of the component is no longer necessary, for example for protection against impurities, graffiti and the like.
  • Both the support layer embodiment and the matrix embodiment may additionally be provided with a protective layer which protects the hydrogel from moisture to prevent swelling prior to concreting.
  • a protective layer for example, hydrophobic agents or conventional concrete release agents are. The concrete pressure acting on the protective layer during concreting exposes the hydrogel and results in the desired absorption of water.
  • the hydrogel applied to the formwork surface is not readily perceptible to the naked eye due to its inconspicuous coloration and the relatively low surface density of the application, in an advantageous embodiment of the invention the hydrogel is removed from the surface Application to the scarf surface mixed with color pigments.
  • Suitable color pigments are the pigments or carbon black particles known for the coloration of concrete.
  • the mixture of hydrogel and color pigments is well perceived after the order on the scarf surface, so that a complete and uniform application of the composition according to the invention is easy to monitor.
  • the mixture of hydrogel and color pigments can be applied as described above to a carrier layer or incorporated into a matrix. Since some color pigments themselves have adhesive properties, the mixture can also be applied directly to the formwork surface, for example by rubbing in.
  • Fig. 1 one sees the area of a formwork skin 2 facing the concrete 1, the formwork surface of which is designated by the reference numeral 3.
  • a viscous carrier layer 4 adheres to the formwork surface 3.
  • Particles of a pulverulent hydrogel 5, which adheres to the carrier layer 4 as a result of adhesion occurring, can be seen on the outside of the carrier layer 4.
  • the hydrogel 5 may be covered with a protective layer 6, which is merely indicated by dashed lines.
  • Fig. 2 illustrated embodiment of the invention also shows the concrete side part of a formwork 2 with scarf 3.
  • a matrix 7 is applied, in which particles of a hydrogel 5 are embedded.
  • the matrix may be 7 may be covered with a hydrogel 5 of a protective layer 6 according to the under Fig. 1 described embodiment.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Claims (12)

  1. Procédé de fabrication d'un élément de construction en béton muni d'une zone marginale bétonnée à haute valeur qualitative, par déversement de béton (1) dans un coffrage (2), caractérisé par le fait qu'un moyen déposé sur la surface (3) du coffrage (2) tournée vers le béton (1) renferme, en tant que composant essentiel, un polymère hydrophile (5) insoluble dans l'eau, offrant une consistance pulvérulente.
  2. Procédé selon la revendication 1, caractérisé par le fait que le polymère hydrophile (5) insoluble dans l'eau est formé à base d'amidon, de cellulose, de carboxyméthylcellulose, d'acide polyacrylique, de polyacrylate, de polyacrylamide, de polyvinylpyrrolidone, de polyacrylate de potassium, d'alcool polyvinylique, de polyacrylate de sodium ou de polycarboxylates.
  3. Procédé selon la revendication 1, caractérisé par le fait qu'une couche de substrat (4) est tout d'abord déposée sur la surface (3) du coffrage, puis le polymère hydrophile (5) insoluble dans l'eau est déposé sur ladite couche de substrat (4).
  4. Procédé selon la revendication 3, caractérisé par le fait que la couche de substrat (4) est constituée d'un vernis translucide, d'une résine, d'un adhésif, de polyol, de polyuréthane, d'une huile de coffrage, d'une solution aqueuse de styrène-butadiène ou d'une solution aqueuse de silicate.
  5. Procédé selon la revendication 3, caractérisé par le fait que la couche de substrat (4) consiste en un matériau durcissable, par exemple en du polyuréthane.
  6. Procédé selon la revendication 3, caractérisé par le fait que la couche de substrat (4) consiste en un matériau conservant sa viscosité, par exemple en du polyol.
  7. Procédé selon la revendication 3, caractérisé par le fait que la couche de substrat (4) est constituée d'un feuil, ou est placée sur un feuil appliqué sur le coffrage de bétonnage (2), de préférence par collage.
  8. Procédé selon la revendication 7, caractérisé par le fait que le feuil présente au moins une couche de PVC, de polyéthylène ou de polyuréthane, ou bien est constitué par l'un de ces matériaux.
  9. Procédé selon la revendication 1, caractérisé par le fait que le polymère hydrophile (5), insoluble dans l'eau, est mélangé à une matrice (7) liquide ou visqueuse et est déposé sur la surface (3) du coffrage, conjointement à ladite matrice (7).
  10. Procédé selon la revendication 9, caractérisé par le fait que la matrice (7) est constituée d'une résine, d'un adhésif, de polyol, d'une huile de coffrage ou d'une solution aqueuse de styrène-butadiène.
  11. Procédé selon l'une des revendications 3 à 10, caractérisé par le fait que la couche de substrat (4), ou la matrice (7), possède des propriétés hydrophobes.
  12. Procédé selon l'une des revendications 3 à 11, caractérisé par le fait que le moyen comporte une couche de protection (6) sur la surface tournée vers le béton (1).
EP12778610.1A 2011-09-30 2012-09-28 Rocédé de fabrication d'éléments avec une surface et une zone périphérique du béton de haute valeur qualitative Active EP2760653B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12778610T PL2760653T3 (pl) 2011-09-30 2012-09-28 Sposób wytwarzania elementów budowlanych z wysokiej jakości brzegową strefą betonu i powierzchnią betonu

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011114595A DE102011114595A1 (de) 2011-09-30 2011-09-30 Mittel und Verfahren zur Herstellung von Bauteilen mit einer qualitativ hochwertigen Betonrandzone und Betonoberfläche
PCT/EP2012/004087 WO2013045106A1 (fr) 2011-09-30 2012-09-28 Agent et procédé de fabrication d'éléments avec une surface et une zone périphérique du béton de haute valeur qualitative

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EP2760653A1 EP2760653A1 (fr) 2014-08-06
EP2760653B1 true EP2760653B1 (fr) 2017-08-02

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EP (1) EP2760653B1 (fr)
DE (1) DE102011114595A1 (fr)
PL (1) PL2760653T3 (fr)
WO (1) WO2013045106A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021181302A1 (fr) * 2020-03-11 2021-09-16 Malcolmson David Dispositif de distribution pour des mélanges de béton et procédé pour retarder la prise de la partie de surface du béton

Families Citing this family (5)

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DE102015102382A1 (de) * 2015-02-19 2016-08-25 Bundesrepublik Deutschland, Vertreten Durch Den Bundesminister Für Wirtschaft Und Energie, Dieser Vertreten Durch Den Präsidenten Der Bundesanstalt Für Materialforschung Und -Prüfung (Bam) Verfahren zur dauerhaften Hydrophobierung und/oder Superhydrophobierung von Betonoberflächen
AT517865A1 (de) * 2015-10-28 2017-05-15 Hoffmann Hans Trennmittelzusammensetzung
CN109719836B (zh) * 2018-11-14 2020-12-04 重庆新久融科技有限公司 一种用于铝合金模板的脱模剂及其制备方法
CN111117751B (zh) * 2019-12-30 2022-04-05 北京盛大风华科技有限公司 一种高浓水性混凝土脱模剂原液的常温制备方法
CN111423251A (zh) * 2020-03-17 2020-07-17 山西佳维新材料股份有限公司 一种混凝土用毛面剂及其制备方法和应用

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Publication number Priority date Publication date Assignee Title
WO2021181302A1 (fr) * 2020-03-11 2021-09-16 Malcolmson David Dispositif de distribution pour des mélanges de béton et procédé pour retarder la prise de la partie de surface du béton

Also Published As

Publication number Publication date
DE102011114595A1 (de) 2013-04-04
PL2760653T3 (pl) 2018-01-31
EP2760653A1 (fr) 2014-08-06
WO2013045106A1 (fr) 2013-04-04
WO2013045106A4 (fr) 2013-06-20

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