WO2007062854A2 - Utilisation d'un additif comme produit de decoffrage - Google Patents

Utilisation d'un additif comme produit de decoffrage Download PDF

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Publication number
WO2007062854A2
WO2007062854A2 PCT/EP2006/011532 EP2006011532W WO2007062854A2 WO 2007062854 A2 WO2007062854 A2 WO 2007062854A2 EP 2006011532 W EP2006011532 W EP 2006011532W WO 2007062854 A2 WO2007062854 A2 WO 2007062854A2
Authority
WO
WIPO (PCT)
Prior art keywords
mol
formwork
use according
additive
silica
Prior art date
Application number
PCT/EP2006/011532
Other languages
German (de)
English (en)
Other versions
WO2007062854A3 (fr
Inventor
Guillaume Francqueville
Nicolas Moins
Denis Le Cheviller
Guy Laurent
Uwe Holland
Original Assignee
Construction Research & 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 & Technology Gmbh filed Critical Construction Research & Technology Gmbh
Priority to AU2006319360A priority Critical patent/AU2006319360A1/en
Priority to EP06829223A priority patent/EP1963239A2/fr
Priority to JP2008542673A priority patent/JP2009517317A/ja
Publication of WO2007062854A2 publication Critical patent/WO2007062854A2/fr
Publication of WO2007062854A3 publication Critical patent/WO2007062854A3/fr

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
    • C04B28/02—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/60—Releasing, lubricating or separating agents
    • B29C33/62—Releasing, lubricating or separating agents based on polymers or oligomers
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients

Definitions

  • the present invention is the use of an additive as a formwork aid in the use of building chemical compositions.
  • German patent DE 25 10 224 a process for the production of concrete objects using a special concrete additive is described, which contributes to increase the early strength.
  • This patent also includes a concrete admixture which is a stable suspension of 10 to 50% by weight of finely divided silica having a preferred particle diameter of colloidal silica ⁇ 0.1 ⁇ m.
  • WO 2004/002915 A2 calcium silicate hydrate or else a silica with high surface area added. Both accelerators may additionally contain alkali metals.
  • a concrete composition which, in addition to the hydraulic binder, also contains aggregates, water, silica sol and a superplasticizer in the form of a polycarboxylate, is known from WO 01/90024 A1.
  • the silica sol used here is cationically stabilized and has a particle size between 2 and 200 nanometers. Their use is intended to prevent bleeding and at the same time not affect the processability of the concrete composition too much.
  • the European application EP 0 931 030 A1 describes a process for the production of concrete or mortar with increased early strength with a simultaneously good fatigue strength.
  • a mixture consisting of a hydraulic binder, aggregates, water and colloidal silica is prepared, wherein the relative standard deviation of the particle size of the colloidal silica is at least 30%.
  • WO 01/98210 A1 claims a defined silica sol composition comprising a first silica sol component having a broad particle size distribution and a second silica sol component having a narrow particle size spectrum. Also included is the use of such compositions, as additives to concrete or mortar, as well as concrete and mortar compositions which, in addition to hydraulic binders, aggregates and water, also contain a silica sol composition of said grain size distributions.
  • colloidal silica components as additive to cementitious materials is described by WO 2004/035473 A1.
  • the silica components used in this context must have been prepared by a specific process wherein at least one silane component is mixed with colloidal silica particles in the weight ratio of silane to silica component of about 0.003 to 0.2.
  • the silica dispersion obtainable in this way has a silica content of at least 20% by weight.
  • the main disadvantage when stripping precast concrete parts is that the adhesion forces between the building chemical mass and the shuttering material can still not be sufficiently reduced so that damage or partial destruction of the components can be avoided.
  • the object of the present invention was therefore to provide an additive with which mixed-bodied masses can be better processed in the on-state and / or can be more easily switched off in the (partially) cured state.
  • the decisive aspect was to minimize the reject rate and to facilitate the shifting of the shuttering elements during line production. As far as possible, it should be possible to dispense with strength-reducing additives.
  • the desired effects according to the task can be achieved both by inorganic and by organic compounds and their arbitrary mixtures.
  • the respective additives are essentially not limited to strictly defined compounds, but rather that the respective representatives can be selected from an unsuspectedly large number of suitable compounds.
  • the present invention provides as preferred component 1.1 an aluminum-modified colloidal silica wherein the colloidal silica is in particular silica sol ("silica sol"), precipitated silica, silica gel and finely divided silica.
  • silica sol silica sol
  • precipitated silica silica gel
  • finely divided silica finely divided silica
  • stable dispersion or sol of amorphous silica type having a preferred particle size of 0.001 to 100 microns, a particularly preferred particle size of 0.01 to 30 microns, and a most preferred particle size of 0.1 to 15 microns
  • colloidal silica is considered in accordance with the present invention as defined by K. Her, as reported in “The Colloidal Chemistry of Silica” Chapter 4, Wiley & Sons (1979, p 312) Substantive component of the present invention.
  • component 1.2 should in particular be polymers of hydroxyalkyl (meth) acrylate, acrylamide, methacrylamide, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), methyl methacrylate, methyl acrylate, butyl acrylate or cyclohexyl acrylate, which are particularly preferably in each case in part - or fully cross-linked form should be available.
  • hydroxyalkyl (meth) acrylate acrylamide, methacrylamide, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), methyl methacrylate, methyl acrylate, butyl acrylate or cyclohexyl acrylate, which are particularly preferably in each case in part - or fully cross-linked form should be available.
  • AMPS 2-acrylamido-2-methylpropanesulfonic acid
  • Water-soluble or at least partially water-soluble polyvinyl alcohols which should preferably be present in partially saponified form and which are particularly preferred have a saponification degree of 60 to 96%, are considered in the context of the present invention as preferred representatives of component 1.3.
  • Particularly suitable are polyvinyl alcohols having a saponification degree of from 85% to 96%, particularly preferably from 90 to 96%.
  • the polyvinyl alcohols should have an average molecular weight between 20,000 and 80,000, preferably between 25,000 and 70,000, and particularly preferably between 30,000 and 65,000.
  • Preferred components 1.4 used in the context of the present invention are polymer compounds having the general composition
  • R 2 , R 3 , R 4 hydrogen, aliphatic hydrocarbon radical having 1 to 6 C atoms, linear or branched, optionally with
  • V NH or oxygen
  • Hydrocarbon radical having 1 to 20 carbon atoms, linear or branched, cycloaliphatic hydrocarbon radical having 5 to 8 carbon atoms, aryl radical having 6 to 14 carbon atoms and mean
  • X halogen, C 1 to C 4 alkyl sulfate or d-bis
  • R 1 , R 2 and R 3 , M and a are as defined above,
  • R 12 1 wherein at least one radical R 10 , R 11 and / or R 12 must be present, and a saturated or unsaturated, linear or branched, aliphatic hydrocarbon radical having 1 to 40 C atoms
  • R 10 H 1 C 1 -C 4 -AlkVl- , Phenyl, benzyl, C 1 -C 4 -alkoxy,
  • Halogen, cyano, -COOH, -COOR 5 , -CO-NH 2 , -OCOR 5 R 11 arylalkyl group with C 1 -C 12 -alkyl, linear or branched, and C 6 -
  • C 14 aryl radical R 12 alkylaryl group with C 1 -C 12 -alkyl, linear or branched, and C 6
  • component 1.4 up to 50 mol% of the components a) in component 1.4 are replaced by other sulfo-containing structural units derived from methallylsulfonic acid or allylsulfonic acid monomers.
  • the component 1.4 can according to the present invention also from 30 to 80 mol%, preferably 35 to 70 mol%, of the assembly a), 5 to 55 mol%, preferably 10 to 45 mol% of the assembly b), 2nd to 30 mol%, preferably 5 to 25 mol%, of the assembly c) and / or 0.2 to 15 mol%, preferably 0.5 to 10 mol%, of the assembly d).
  • the present invention comprises a further variant of component 1.4 which has a number-average molecular weight of 50,000 to 10,000,000 g / mol.
  • the proposed additive should find use as a formwork aid, in particular when using construction-chemical compositions containing at least one member of the series hydraulic binder, filler, accelerator and dispersing additive.
  • the proposed additive can also be used according to the invention in building chemical compositions, which further contain functional additives.
  • Particularly positive effects succeed with the use according to the invention in connection with construction chemical compositions containing as hydraulic binder cement, lime, gypsum, anhydrite or other calcium sulfate-based binder, with cements of type CEM I to CEM V and aluminate cements and any mixtures thereof as are particularly preferred.
  • the present invention takes into account dispersing additives in the form of a water reducer and / or a superplasticizer according to standard EN 934/2.
  • dispersing additives in the form of a water reducer and / or a superplasticizer according to standard EN 934/2.
  • fillers also already mentioned representatives have been found to be particularly suitable, which have a particle size of 0.1 to 100 mm.
  • the respective additive can be added to the mixing water and introduced with this in the bauchemische raw mass.
  • the additive which is to be used according to the invention as a formwork aid can also be applied to the boundary layer of the formwork prior to introduction of the construction chemical raw material into the formwork.
  • a use variant is also included in the present invention, in which the additive is used as a formwork removal aid in the production of precast concrete parts, preferably for the production of green-strength-resistant and in particular prestressed precast concrete parts.
  • the amounts in which the particular additive is added to the construction chemical mass depend on the specific composition of the construction chemical mass; However, it is advisable to choose amounts which are between 0.001 and 1, 0 wt .-% and preferably between 0.01 and 0.5 wt .-%, each based on the total composition.
  • the concrete to be characterized is freshly prepared and transferred immediately after mixing in a corresponding Gleitform (open top and bottom mold of the corresponding molded part, which is closed at the front and provided at the rear with a removable closure) and compacted by appropriate vibration.
  • the front side of the slipform is connected to a dynamometer by a steel cable and this with a corresponding hand crank.
  • Fi describes the measurand of the dynamometer, which is needed to set the slipforming in motion for the first time
  • Ffb describes the measurand of the dynamometer in order to move the slipform at a constant speed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Abstract

L'invention concerne l'utilisation d'un additif comme produit de décoffrage lors de l'utilisation de matières chimiques de construction. On entend par additifs, par exemple, des suspensions de particules inorganiques à base d'oxyde d'aluminium et/ou de silicium, des dérivés d'acide (méth-)acrylique polyumériques, des alcools polyvinyliques saponifiés ou des copolymères ou terpolymères solubles dans l'eau, contenant des groupes sulfo et ayant un poids moléculaire moyen compris entre 50 000 et 20 000 000 g/mole. On préfère la silice colloïdale modifiée par aluminium ou, par exemple, l'amide (méth-)acrylique, le méthylacrylate ou encore le cyclohexylacrylate mais les alcools polyvinyliques (partiellement) solubles dans l'eau sous forme partiellement saponifiée ayant un degré de saponification de 60 à 96 % conviennent également. L'additif concerné peut être ajouté à l'eau de gâchage ou prédissous dans l'agent dispersant ou simultanément ajouté à l'agent dispersant de la matière chimique de construction. Il est toutefois possible d'appliquer l'additif sur la surface limite entre le coffrage et la matière chimique de construction avant d'introduire cette dernière dans le coffrage. La nouvelle utilisation en tant qu'agent auxiliaire de décoffrage permet d'obtenir un procédé de décoffrage facilité par la réduction des forces d'adhésion et, dans la production des éléments préfabriqués en béton, une meilleure séparation des éléments de coffrage lors de la production en chaîne.
PCT/EP2006/011532 2005-12-01 2006-11-30 Utilisation d'un additif comme produit de decoffrage WO2007062854A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2006319360A AU2006319360A1 (en) 2005-12-01 2006-11-30 Use of an additive as an agent aiding in the removal of formwork
EP06829223A EP1963239A2 (fr) 2005-12-01 2006-11-30 Utilisation d'un additif comme produit de decoffrage
JP2008542673A JP2009517317A (ja) 2005-12-01 2006-11-30 脱型助剤としての添加剤の使用

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005057507A DE102005057507A1 (de) 2005-12-01 2005-12-01 Verwendung eines Additivs als Entschalungshilfsmittel
DE102005057507.2 2005-12-01

Publications (2)

Publication Number Publication Date
WO2007062854A2 true WO2007062854A2 (fr) 2007-06-07
WO2007062854A3 WO2007062854A3 (fr) 2007-07-26

Family

ID=38015391

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/011532 WO2007062854A2 (fr) 2005-12-01 2006-11-30 Utilisation d'un additif comme produit de decoffrage

Country Status (6)

Country Link
EP (1) EP1963239A2 (fr)
JP (1) JP2009517317A (fr)
CN (1) CN101321711A (fr)
AU (1) AU2006319360A1 (fr)
DE (1) DE102005057507A1 (fr)
WO (1) WO2007062854A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007027470A1 (de) 2007-06-14 2008-12-24 Construction Research & Technology Gmbh Polymervergütete Baustofftrockenmischungen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2576955A (en) * 1946-10-18 1951-12-04 Universal Atlas Cement Company Low-water-loss cement
WO2001090024A1 (fr) * 2000-05-19 2001-11-29 Akzo Nobel N.V. Composition et procede permettant de preparer une composition de beton
WO2005035603A1 (fr) * 2003-10-18 2005-04-21 Construction Research & Technology Gmbh Copolymeres et terpolymeres solubles dans l'eau et contenant des groupes sulfo, leur production et leur utilisation comme stabilisants pour des systemes de materiau de construction aqueux et pour des systemes de peinture et de revetement a base d'eau

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2576955A (en) * 1946-10-18 1951-12-04 Universal Atlas Cement Company Low-water-loss cement
WO2001090024A1 (fr) * 2000-05-19 2001-11-29 Akzo Nobel N.V. Composition et procede permettant de preparer une composition de beton
WO2005035603A1 (fr) * 2003-10-18 2005-04-21 Construction Research & Technology Gmbh Copolymeres et terpolymeres solubles dans l'eau et contenant des groupes sulfo, leur production et leur utilisation comme stabilisants pour des systemes de materiau de construction aqueux et pour des systemes de peinture et de revetement a base d'eau

Also Published As

Publication number Publication date
WO2007062854A3 (fr) 2007-07-26
JP2009517317A (ja) 2009-04-30
AU2006319360A1 (en) 2007-06-07
EP1963239A2 (fr) 2008-09-03
CN101321711A (zh) 2008-12-10
DE102005057507A1 (de) 2007-06-06

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