EP0764143A1 - Use of sols for treating surfaces of unhardened and hardened binder suspensions - Google Patents

Use of sols for treating surfaces of unhardened and hardened binder suspensions

Info

Publication number
EP0764143A1
EP0764143A1 EP96908327A EP96908327A EP0764143A1 EP 0764143 A1 EP0764143 A1 EP 0764143A1 EP 96908327 A EP96908327 A EP 96908327A EP 96908327 A EP96908327 A EP 96908327A EP 0764143 A1 EP0764143 A1 EP 0764143A1
Authority
EP
European Patent Office
Prior art keywords
use according
suspensions
sols
binder suspensions
metals
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Withdrawn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
EP96908327A
Other languages
German (de)
French (fr)
Inventor
Manfred Akstinat
Willi Suter
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.)
Cement Intellectual Property Ltd CIP
Original Assignee
Holderchem AG
Holderchem Holding AG
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 Holderchem AG, Holderchem Holding AG filed Critical Holderchem AG
Publication of EP0764143A1 publication Critical patent/EP0764143A1/en
Withdrawn legal-status Critical Current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
    • 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
    • C04B40/04—Preventing evaporation of the mixing water
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00482—Coating or impregnation materials

Definitions

  • the invention relates to the use of sols of non-metals or metals, their oxides, hydroxides, oxihydrates and / or their polymers (such as, for example, heteropolyacids) to reduce the susceptibility to cracking when curing non-hardened binder suspensions (such as, for example, fresh concrete, ReadyMix) and for post-treatment of already hardened binder suspensions (such as concrete).
  • non-hardened binder suspensions such as, for example, fresh concrete, ReadyMix
  • already hardened binder suspensions such as concrete.
  • Binder systems which are mixed with water or other solvents are exposed to hydration and dehydration processes, which are usually difficult to control in the first phase of their curing.
  • the invention now aims to better control the initial phase of the setting process and also to ensure subsequent further treatments of surfaces of binder suspensions (such as concrete) that have already largely hardened or hardened.
  • binder suspensions such as concrete
  • the use according to the invention of the type mentioned at the outset is proposed, the fact that from the sols mentioned can be achieved by suitable additives or by the free Ca (0H) 2 of the concrete or because of the limited temporal stability of the When brine is formed as a result, gels are formed, a correspondingly dense coating that prevents evaporation is created.
  • the brine is applied to the surface of binder suspensions, in particular sprayed on or rolled up.
  • Appropriate stabilization of the brine can be carried out in order to set the desired time until the formation of gels, the use advantageously being carried out here in such a way that the brine is used in a stabilized manner using mineral or biodegradable additives.
  • the stabilization serves to control the point in time of gel formation as precisely as possible, whereby advantageously It will be noted that the gel formation by adding sol stabilizing agents or promoting gel formation. Means ge is controlled, the desired effect of the brine being controlled by targeted triggering or delaying gel formation.
  • the gels or reactions that occur on the surface lead, among other things, to: to a drying or diffusion barrier, to an increase in strength and a reduction in permeability in the surface zones, to a reduction in segregation, to an improvement in the processability of liquid binder suspensions, to an improved compression in the upper zones and to an increase in the durability of the resulting solid.
  • the proposed use is particularly in connection with self-curing systems in the concrete and cement mortar sector, industrial flooring with binder systems based on cements, gypsum, Sorel cement, etc., the development of roller-compacted surfaces with binder systems of various types and as a subsequent treatment of already cured and / or freshly cured. Concrete surfaces (among other things to improve durability (e.g. in precast production) are particularly advantageous.
  • sols proposed according to the invention also use, as yet uncured, surfaces of binder suspensions (such as fresh concrete, ready mix, ready-mixed concrete) to improve the volume stability and to prevent shrinkage or cracking, as well as to increase the Durability through permeability reduction, for Use a reduction in the alkali aggregate reaction and to improve the mechanical properties of the cement stone and to reduce the waviness of surfaces.
  • binder suspensions such as fresh concrete, ready mix, ready-mixed concrete

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention concerns the use of sols of non-metals or metals, their oxides, hydroxides, oxihydrates and/or polymers thereof (e.g. hetero-polyacids) for reducing proneness to cracking during hardening of unhardened binder suspensions (such as fresh concrete, ready-mix) and for secondary treatment of binder suspensions (e.g. concrete) which have hardened.

Description

Verwendung von Solen zur Oberflächenbehandlung von nicht-ausσe- härteten und ausgehärteten Bindemittelsuspensionen Use of sols for the surface treatment of non-hardened and hardened binder suspensions
Die Erfindung bezieht sich auf die Verwendung von Solen von Nichtmetallen oder Metallen, deren Oxiden, Hydroxiden, Oxihydra- ten und/oder deren Polymeren (wie z.B. Heteropolysäuren) zur Verringerung der Rißanfälligkeit beim Aushärten von nicht-ausge- härteten Bindemittelsuspensionen (wie z.B. Frischbeton, Ready- Mix) und zur Nachbehandlung von bereits ausgehärteten Binde- mittelsuspensionen (wie z.B. Beton) .The invention relates to the use of sols of non-metals or metals, their oxides, hydroxides, oxihydrates and / or their polymers (such as, for example, heteropolyacids) to reduce the susceptibility to cracking when curing non-hardened binder suspensions (such as, for example, fresh concrete, ReadyMix) and for post-treatment of already hardened binder suspensions (such as concrete).
Bindemittelsysteme, welche mit Wasser oder anderen Lösemitteln angemacht werden, sind in der ersten Phase ihrer Aushärtung zu¬ meist schwer kontrollierbaren Hydratations- und Dehydratations- Vorgängen ausgesetzt. Die in diesem Zeitraum auftretenden Tempe¬ raturschwankungen, ebenso wie die bei der Hydratation sich ändernden Gefügestrukturen, führen zu mechanischen Spannungen, wobei zumeist unerwünschte Volumenveränderungen/Schrumpfungsvor¬ gänge zu Rißbildungen, Separations- oder Segregationserscheinun- gen und in der Folge negative Veränderungen in den mechanischen Eigenschaften der ausgehärteten Produkte auftreten.Binder systems which are mixed with water or other solvents are exposed to hydration and dehydration processes, which are usually difficult to control in the first phase of their curing. The temperature fluctuations that occur in this period, as well as the structural structures that change during hydration, lead to mechanical stresses, with mostly undesired volume changes / shrinkage processes leading to cracks, signs of separation or segregation, and consequently negative changes in the mechanical Properties of the cured products occur.
In der Baupraxis ist es bekannt, beispielsweise auf Frischbeton¬ oberflächen die Verdampfungsverluste bzw. die obeflächennahe Austrocknung durch Wasserzufuhr zu begrenzen. Neben dem Auf¬ sprühen von Wasser auf frische Betonflächen ist beispielsweise auch vorgeschlagen worden, organische Lösungsmittel (z.B Glyko- le) oder mineralische bzw. pflanzliche Öle aufzutragen, um auf diese Weise eine Art Dampfsperre zu bilden und ein unkontroll- iertes Abdampfen von Wasser zu verhindern. Nachteilig bei derar¬ tigen Oberflächenbehandlungen ist der Umstand, daß die Ober¬ fläche dauerhaften Veränderungen unterworfen wird (z.B. Festig¬ keitsverlust) und in der Folge meist einen sogenannten Antihaft- effekt aufweist, so daß das Aufbringen weiterer Beschichtungen erschwert und ein dauerhafter Verbund mit nachfolgenden Schich¬ ten bzw. Beschichtungen verhindert werden. Die Erfindung zielt nun darauf ab, die Anfangsphase des Abbinde¬ vorganges besser zu kontrollieren und auch nachträgliche Weiter¬ behandlungen von bereits weitestgehend erhärteten bzw. ausgehär¬ teten Oberflächen von Bindemittelsuspensionen (wie z.B. Beton) zu gewährleisten. Zur Lösung dieser Aufgabe wird die erfindungs¬ gemäße Verwendung der eingangs genannten Art vorgeschlagen, wobei der Umstand, daß aus den genannten Solen durch geeignete Zusätze bzw. durch das freie Ca(0H)2 des Betons oder aber auf¬ grund der begrenzten zeitlichen Stabilität der Sole in der Folge Gele gebildet werden, ein entsprechend dichter und ein Verdamp- fung-behindernder Überzug geschaffen wird. Im Fall von bereits ausgehärteten Bindemittelsuspensionen (wie z.B. Beton) wird bei einem derartigen Ausfällen von Gel rechtzeitig eine Sanierung von bereits entstandenen Mikrorissen beobachtet, so daß insge- samt die Permeabilität sowie mechanische Stabilität der Ober¬ fläche wesentlich verbessert werden. Dadurch, daß die Sole auf der Basis von Nichtmetallen oder Metallen, deren Oxiden, Hydro¬ xiden oder Oxihydraten und/oder deren Polymeren eingesetzt werden, wird eine anorganisch und in der Folge thermisch nicht weiter zerstörbare dauerhafte Oberflächenschicht geschaffen, welche je nach Wahl der entsprechenden Nichtmetalle oder Metal¬ le, die mechanische Verbesserung der Oberflächen gleichzeitig mit dem Vorteil verbindet, daß spätere darauf aufgetragene wei¬ tere Schichten ohne Ausbildung eines Antihafteffektes sicher mit darunterliegenden Schichten verbunden werden können.In construction practice, it is known to limit the evaporation losses or the drying out close to the surface by supplying water, for example on fresh concrete surfaces. In addition to spraying water onto fresh concrete surfaces, it has also been proposed, for example, to apply organic solvents (for example glycols) or mineral or vegetable oils in order to form a type of vapor barrier and to allow water to evaporate in an uncontrolled manner prevent. A disadvantage of such surface treatments is the fact that the surface is subjected to permanent changes (eg loss of strength) and consequently usually has a so-called non-stick effect, so that the application of further coatings is difficult and a permanent bond with subsequent ones Layers or coatings can be prevented. The invention now aims to better control the initial phase of the setting process and also to ensure subsequent further treatments of surfaces of binder suspensions (such as concrete) that have already largely hardened or hardened. To achieve this object, the use according to the invention of the type mentioned at the outset is proposed, the fact that from the sols mentioned can be achieved by suitable additives or by the free Ca (0H) 2 of the concrete or because of the limited temporal stability of the When brine is formed as a result, gels are formed, a correspondingly dense coating that prevents evaporation is created. In the case of binder suspensions which have already hardened (such as concrete), if the gel precipitates in this way, remediation of microcracks which have already occurred is observed in good time, so that overall the permeability and mechanical stability of the surface are significantly improved. The fact that the sols are based on non-metals or metals, their oxides, hydroxides or oxy-hydrates and / or their polymers is used to create a permanent surface layer which is inorganic and consequently cannot be further thermally destroyed, and which, depending on the choice of the corresponding surface layer Non-metals or metals which combine mechanical improvement of the surfaces at the same time with the advantage that later layers applied thereon can be securely bonded to layers underneath without the formation of a non-stick effect.
Gemäß einer bevorzugten Verwendung werden die Sole auf die Ober¬ fläche von Bindemittelsuspensionen aufgetragen, insbesondere aufgesprüht oder aufgerollt.According to a preferred use, the brine is applied to the surface of binder suspensions, in particular sprayed on or rolled up.
Zur Einstellung der gewünschten Zeit bis zur Ausbildung von Gelen kann eine entsprechende Stabilisierung der Sole vorgenom¬ men werden, wobei hier in vorteilhafter Weise die Verwendung so erfolgt, daß die Sole unter Verwendung mineralischer oder bio- logisch abbaubarer Zusätze stabilisiert eingesetzt werden. Die Stabilisierung dient hiebei dazu, den Zeitpunkt der Gelbildung möglichst genau zu kontrollieren, wobei mit Vorteil so vorgegan- gen wird, daß die Gelbildung durch Zusatz von das Sol stabili¬ sierenden Mitteln oder die Gelbildung fördernder. Mitteln ge¬ steuert wird, wobei die gewünschte Wirkung der Sole durch gezielte Auslösung oder Verzögerung der Gelbildung gesteuert wird.Appropriate stabilization of the brine can be carried out in order to set the desired time until the formation of gels, the use advantageously being carried out here in such a way that the brine is used in a stabilized manner using mineral or biodegradable additives. The stabilization serves to control the point in time of gel formation as precisely as possible, whereby advantageously It will be noted that the gel formation by adding sol stabilizing agents or promoting gel formation. Means ge is controlled, the desired effect of the brine being controlled by targeted triggering or delaying gel formation.
Insgesamt können bekannte Nachbehandlungsverfahren von frischen Bindemitteloberflächen (wie beispielsweise das Auflegen nasser Tücher, Folien oder das Aufsprühen von Wasser) unterbleiben, da die Sol-Gelschicht den Wasserhaushalt von Bindemittelsystemen über längere Zeit nahezu konstant hält und eine exakte Kontrolle ermöglicht.Overall, known post-treatment processes for fresh binder surfaces (such as the application of wet cloths, foils or the spraying of water) can be omitted, since the sol-gel layer keeps the water balance of binder systems almost constant over a long period of time and enables exact control.
Die auftretenden Gele bzw. Reaktionen an der Oberfläche führen u.a. zu einer Austrocknungs- bzw. Diffusionsbarriere, zu einer Festigkeitssteigeruπg und Permeabilitätsverringerung in den Oberflächenzonen, zur Verringerung der Segregation, zur Verbes¬ serung der Verarbeitbarkeit von flüssigen Bindemittelsuspensio¬ nen, zur verbesserten Verdichtung in den oberen Zonen sowie zur Erhöhung der Dauerhaftigkeit des resultierenden Festkörpers.The gels or reactions that occur on the surface lead, among other things, to: to a drying or diffusion barrier, to an increase in strength and a reduction in permeability in the surface zones, to a reduction in segregation, to an improvement in the processability of liquid binder suspensions, to an improved compression in the upper zones and to an increase in the durability of the resulting solid.
Die vorgeschlagene Verwendung ist insbesondere im Zusammenhang mit Self-Curing Systemen im Beton- und Zement-Mörtelbereich, der Industrieböden-Hers-ellung mit Bindemittelsystemen, basierend auf Zementen, Gips, Sorelzement etc., der Ausbildung von Roller- Compacted Surfaces r.it Bindemittelsystemen verschiedener Art und als nachträgliche Behandlung von bereits ausgehärteten und/oder frisch-ausgehärteter. Betonoberflächen (u.a. zur Verbesserung der Dauerhaftigkeit (z.Ξ. in der Fertigteil-Produktion) von besonde- re Vorteil.The proposed use is particularly in connection with self-curing systems in the concrete and cement mortar sector, industrial flooring with binder systems based on cements, gypsum, Sorel cement, etc., the development of roller-compacted surfaces with binder systems of various types and as a subsequent treatment of already cured and / or freshly cured. Concrete surfaces (among other things to improve durability (e.g. in precast production) are particularly advantageous.
Darüberhinaus lasser. sich die erfindungsgemäß vorgeschlagenen Sole auch dazu venrenden, noch-nicht-ausgehärtete Oberflächen von Bindemittelsuspensionen (wie z.B. Frischbeton, Ready-Mix, Transportbeton) zur Verbesserung der Volumen-Stabilität und zur Verhinderung der Schrumpfung bzw. Rißbildung, ebenso wie zur Er¬ höhung der Dauerhaftigkeit durch Permeabilitätsreduktion, zur Verringerung der Alkaliaggregatreaktion und zur Verbesserung der mechanischen Eigenschaften des Zementsteines und zur Verringe¬ rung der Welligkeit von Oberflächen einsetzen. Furthermore let. the sols proposed according to the invention also use, as yet uncured, surfaces of binder suspensions (such as fresh concrete, ready mix, ready-mixed concrete) to improve the volume stability and to prevent shrinkage or cracking, as well as to increase the Durability through permeability reduction, for Use a reduction in the alkali aggregate reaction and to improve the mechanical properties of the cement stone and to reduce the waviness of surfaces.

Claims

Patentansprüche: Claims:
1. Verwendung von Solen von Nichtmetallen oder Metallen, deren Oxiden, Hydroxiden, Oxihydraten und/oder deren Polymeren, wie z.B. Heteropolysäuren zur Verringerung der Rißanfälligkeit beim Nachbehandeln von Oberflächen von nicht ausgehärteten Binde¬ mittelsuspensionen, wie z.B. Frischbeton, Ready-Mix und zur Nachbehandlung von bereits ausgehärteten Bindemittelsuspensio- nen, wie z.B. Beton.1. Use of sols of non-metals or metals, their oxides, hydroxides, oxyhydrates and / or their polymers, e.g. Heteropolyacids to reduce susceptibility to cracking during the aftertreatment of surfaces of uncured binder suspensions, e.g. Fresh concrete, ready mix and for post-treatment of already hardened binder suspensions, e.g. Concrete.
2. Verwendung nach Anspruch 1, dadurch gekennzeichnet, daß die Sole auf die Oberfläche von flüssigen oder erhärteten Binde¬ mittelsuspensionen aufgetragen, insbesondere aufgesprüht oder gerollt v/erden.2. Use according to claim 1, characterized in that the brine applied to the surface of liquid or hardened Binde¬ medium suspensions, in particular sprayed or rolled v / earth.
3. Verwendung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Sole unter Verwendung mineralischer oder biologisch ab¬ baubarer Zusätze stabilisiert eingesetzt werden.3. Use according to claim 1 or 2, characterized in that the brine is used stabilized using mineral or biodegradable additives.
4. Verwendung nach einem der Ansprüche 1 bis 3 , dadurch gekenn¬ zeichnet, daß die Sole zur Verringerung der Permeabilität der Bindemittelsuspensionen eingesetzt werden.4. Use according to one of claims 1 to 3, characterized gekenn¬ characterized in that the brines are used to reduce the permeability of the binder suspensions.
5. Verwendung nach einem der Ansprüche 1 bis 4, dadurch gekenn¬ zeichnet, daß die gewünschte Wirkung der Sole durch gezielte Auslösung oder Verzögerung der Gelbildung gesteuert wird.5. Use according to one of claims 1 to 4, characterized gekenn¬ characterized in that the desired effect of the brine is controlled by targeted triggering or delaying the gel formation.
6. Verwendung nach einem der Ansprüche 1 bis 5, dadurch gekenn- zeichnet, daß die Gelbildung durch Zusatz von das Sol stabili¬ sierenden Mitteln oder die Gelbildung fördernden Mitteln gesteuert wird. 6. Use according to one of claims 1 to 5, characterized in that the gel formation is controlled by the addition of the sol stabilizing agents or the gel formation promoting agents.
EP96908327A 1995-04-07 1996-04-04 Use of sols for treating surfaces of unhardened and hardened binder suspensions Withdrawn EP0764143A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT62095 1995-04-07
AT620/95 1995-04-07
PCT/IB1996/000370 WO1996031448A1 (en) 1995-04-07 1996-04-04 Use of sols for treating surfaces of unhardened and hardened binder suspensions

Publications (1)

Publication Number Publication Date
EP0764143A1 true EP0764143A1 (en) 1997-03-26

Family

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EP96908327A Withdrawn EP0764143A1 (en) 1995-04-07 1996-04-04 Use of sols for treating surfaces of unhardened and hardened binder suspensions

Country Status (7)

Country Link
US (1) US5925416A (en)
EP (1) EP0764143A1 (en)
AU (1) AU707054B2 (en)
BR (1) BR9606300A (en)
CA (1) CA2192306A1 (en)
CZ (1) CZ352796A3 (en)
WO (1) WO1996031448A1 (en)

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Publication number Priority date Publication date Assignee Title
US7883575B2 (en) * 2006-10-02 2011-02-08 Bowers Robert B Colloidal sealant composition
WO2014032132A1 (en) 2012-08-30 2014-03-06 Cargill, Incorporated Concentrated sugar additive as set retarder for cement preparations

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US1859253A (en) * 1929-07-10 1932-05-17 Silica Products Company Concrete curing agent
US1899576A (en) * 1930-11-13 1933-02-28 Grasselli Chemical Co Method of protecting concrete surfaces during curing
FR1451188A (en) * 1962-12-27 1966-01-07 Prod Chim D Auby Soc D Process for the treatment of delayed or timed plasters tending to fix the mixing water during setting
US3695906A (en) * 1971-05-28 1972-10-03 Ray F Mccune Concrete hardening method and composition
JPS5622823B2 (en) * 1972-08-17 1981-05-27
JPS5349020A (en) * 1976-10-15 1978-05-04 Matsushita Electric Works Ltd Curable fnorganic compound
JPS5844745B2 (en) * 1977-12-15 1983-10-05 ライオン・アクゾ株式会社 Steam-based corrosion inhibitor composition
JPS589076B2 (en) * 1978-09-01 1983-02-18 日産化学工業株式会社 Surface coating method for foamed calcium silicate board
JPS5935856B2 (en) * 1981-07-18 1984-08-31 太平洋セメント株式会社 Curing composition
JPS59232986A (en) * 1983-06-10 1984-12-27 ハイウオ−ル株式会社 Waterproofing enhancement for construction board
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Also Published As

Publication number Publication date
AU707054B2 (en) 1999-07-01
AU5161896A (en) 1996-10-23
BR9606300A (en) 1997-09-16
WO1996031448A1 (en) 1996-10-10
CZ352796A3 (en) 1997-04-16
CA2192306A1 (en) 1996-10-10
MX9606130A (en) 1998-06-28
US5925416A (en) 1999-07-20

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