DE1054900B - Process for firmly bonding fresh and old concrete - Google Patents

Process for firmly bonding fresh and old concrete

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Publication number
DE1054900B
DE1054900B DEA21708A DEA0021708A DE1054900B DE 1054900 B DE1054900 B DE 1054900B DE A21708 A DEA21708 A DE A21708A DE A0021708 A DEA0021708 A DE A0021708A DE 1054900 B DE1054900 B DE 1054900B
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DE
Germany
Prior art keywords
concrete
fresh
water
old concrete
old
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.)
Pending
Application number
DEA21708A
Other languages
German (de)
Inventor
Wilhelm Muhm
Dr Hatto Metschke
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.)
ALBERT EMULSIONSWERK GES MIT B
Original Assignee
ALBERT EMULSIONSWERK GES MIT B
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 ALBERT EMULSIONSWERK GES MIT B filed Critical ALBERT EMULSIONSWERK GES MIT B
Priority to DEA21708A priority Critical patent/DE1054900B/en
Publication of DE1054900B publication Critical patent/DE1054900B/en
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/66—Sealings
    • E04B1/68—Sealings of joints, e.g. expansion joints
    • E04B1/6806—Waterstops
    • 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
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/48—Macromolecular compounds
    • C04B41/4811—Condensation polymers of aldehydes or ketones
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
    • C04B41/61—Coating or impregnation
    • C04B41/62—Coating or impregnation with organic materials
    • C04B41/63—Macromolecular compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Architecture (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Description

Verfahren zur haftfesten Verbindung von frischem mit altem Beton Es ist ein altes Problem, eine frische Betonschicht haftfest mit altem Beton zu verbinden. Selbst wenn man den alten Beton vor dem Aufbringen des frischen Betons anspitzt, aufrautet und gut annäßt, ist noch keime Gewähr für eine haftfeste Verbindung gegeben.Process for firmly bonding fresh and old concrete Es is an old problem to bond a fresh concrete layer firmly with old concrete. Even if you sharpen the old concrete before applying the fresh concrete, roughened and wets well, there is still no guarantee of a firm connection.

Eine innige Verbindung von frischem mit altem Beton entsteht nun durch eine Haftbrücke aus Kunstharz, die etwa wie eine Leimschicht zwischen zwei verleimten Hölzern wirkt oder durch kunstharzhaltigen Beton.An intimate connection between fresh and old concrete is now created an adhesive bridge made of synthetic resin that glued together like a layer of glue between two Looks like wood or through concrete containing synthetic resin.

Da wasserhaltige Stoffe miteinander verbunden werden müssen; kommt als Leim nur eine Kunstharzemulsion oder eine wäßrige Kunstharzlösung in Frage.Since water-containing substances have to be connected to one another; comes only a synthetic resin emulsion or an aqueous synthetic resin solution can be used as glue.

Man hat schon versucht, Emulsionen aus Polyvinylharz, insbesondere Polyvinylacetat (PVA), auf den alten Beton aufzubringen oder dem Anmachwasser des frischen Betons beizumischen, um dadurch eine haftfeste Verbindung zu erreichen. Da aber die Harzteilchen in stabilen PVA-Emulssionen sehr grob b.zw. groß sind, enthalten diese, damit sie bei der Einmischung von größeren Mengen Füllstoffen nicht zerfallen, einen hohen Anteil an wasserlöslichen, starke quell:baren Emufgatoren. Grobe Harzteilchen können natürlich nicht so leicht und so tief in .den Beton eindringen wie feindispergiertes oder gelöstes Harz. Die groben Harzteilichen werden vielmehr durch den Beton filtriert und bilden so eine Zwischenschicht ohne genügende Verankerung mit .dem Beton.Attempts have been made to use polyvinyl resin emulsions, in particular Polyvinyl acetate (PVA), to be applied to the old concrete or to the mixing water of the Mix in fresh concrete in order to achieve a strong bond. However, since the resin particles in stable PVA emulsions are very coarse or are tall contain these so that they do not have to be mixed in with larger amounts of fillers disintegrate, a high proportion of water-soluble, strong swellable emulsifiers. Of course, coarse resin particles cannot penetrate so easily and so deeply into the concrete such as finely dispersed or dissolved resin. Rather, the coarse resin particles become filtered through the concrete and thus form an intermediate layer without sufficient anchoring with .the concrete.

Beim Trocknen des mit Harz versetzten Betons schwindet der in der PVA-Emulsion in verhältnismäßig großen Mengen vorliegende Emulgator und führt zu Sch.windspannun,gen im Beton (Chemisches Zentralblatt, 1954, S.4461 und 4697). Andererseits quillt .der wasserlösliche Emulgator beim Zutritt von Wasser und Feuchtigkeit, was besonders bei Fahrbahndecken vorkommt, wieder erheblich und löst oder lockert dadurch .die Verleimung.When the concrete mixed with resin dries, the in the concrete disappears PVA emulsion present in relatively large amounts emulsifier and leads to Wind stresses in concrete (Chemisches Zentralblatt, 1954, pp. 4461 and 4697). on the other hand the water-soluble emulsifier swells when exposed to water and moisture, what occurs especially with road surfaces, again considerably and loosens or loosens as a result .gluing.

Es wurde nun gefunden, daß sich diese Nachteile beheben lassen, wenn man statt reiner PVA-Emulsion ein Gemisch aus einer PVA-Emulsion und einer wäßrigen Kondensationsharz-, vorzugsweise Harnstoffharzlösung als Haftbrücke zwischen altem und frischem Beton verwendet oder ein solches Gemisch dem Anmachwasser des frischen Betons zusetzt. Bei einer Frischbetonauflage von mindestens 30 mm genügt im allgemeinen eine Haftbrücke, bei schwächeren Auflagen muß auch der Frischbeton mit Kunstharz versetzt werden.It has now been found that these disadvantages can be remedied if instead of a pure PVA emulsion, a mixture of a PVA emulsion and an aqueous one is used Condensation resin, preferably urea resin solution as a bonding bridge between old and fresh concrete used or such a mixture to the mixing water of the fresh Concrete clogs. With a fresh concrete layer of at least 30 mm is generally sufficient a bonding bridge, with weaker editions the fresh concrete must also be made with synthetic resin be moved.

Einerseits härtet das in der Harnstofharzlösung vorhandene Formaldehyd den wasserlöslichen Emulgator (Polyvinylal'leoho:l) der PVA-Emulsion, macht ihn wasserunlöslich und verhindert somit seine Quellung, andererseits härtet die in der PVA-Emulsion befintdliche Essigsäure das wasserlösliche Harnstoffharz.On the one hand, the formaldehyde present in the urea resin solution hardens the water-soluble emulsifier (polyvinylal'leoho: l) of the PVA emulsion makes it insoluble in water and thus prevents its swelling, on the other hand the in In the PVA emulsion, acetic acid is the water-soluble urea resin.

Die Verankerung und Haftfestigkeit von Frischbeton an altem Beton über eine Haftbrücke aus Kunstharz wurde erstens durch Abscherversuche, zweitens durch Biegezugprüfungen untersucht.The anchoring and adhesive strength of fresh concrete on old concrete An adhesive bridge made of synthetic resin was firstly through shear tests, secondly examined by bending tensile tests.

Die Abscherung wurde erst an verleimten Betonplatten mit polierter Oberfläche, dann an Betonplatten mit rauher Oberfläche festgestellt.The shearing was only done on glued concrete slabs with polished Surface, then found on concrete slabs with a rough surface.

Die Bdegezugfestigkeit wurde an verleimten Prismen nach Wasserlagerung sowohl im trockenen als auch im feuchten Zustand bestimmt.The tensile strength was measured on glued prisms after immersion in water determined both in the dry and in the wet state.

Bei allen Versuchen wurden zur Verleimung :des Betons a) eine Haftbrücke aus einer reinen PVA-Emulsion, b) eine Haftbrücke aus einem Gemisch aus PVA-Emulsion und Harnstoff'harzlösung verwendet.In all tests, the following were used to glue: the concrete a) an adhesive bridge from a pure PVA emulsion, b) an adhesive bridge from a mixture of PVA emulsion and urea resin solution is used.

Die Werte der durchgeführten Prüfungen sind aus den beiden folgenden Tabellen zu ersehen. 1. Scherfestigkeit Polierte Flächen Rautee Flächen kg/cm2 kg/cm2 Haftbrücke, bestehend aus: a) 50°/aiger PVA-Emulsion ......................... 4,1 48 b) 1 RT 50o/oiger PVA-Emulsion -I- 1 RT 50o/odger wässe- riger Harnstoffharzlösung ........................ 9,6 45 z. Biegezugfestigkeit Nach 3 Tagen Nach 7 Tagen feuchter Lagerung feuchter Lagerung nach Trocknung gebrochen in feuchtem Zustand gebrochen kg/cm' kg/cm2 Haftbrücke, bestehend aus: a) 50a/aiger PVA-Emulsion ... ...... .... .. ...... .. .. 29 15,7 b) 1 RT 50o/oiger PVA-Emulsion -I-1 RT 50o/oiger wässe- riger Harnstoffharzlösung .... . .. . . . . .. . . . . .. . . . . .. 35 25,5 Da bei frischem Beton, der in dünnen Schichten auf den alten Beton, insbesondere auf altem Fahrbahnbeton, aufgebracht worden ist, die Gefahr besteht, daß er zu schnell austrocknet und dadurch dem Zement das zur Abbindung notwendige Wasser entzogen wird und er dann verdurstes, wurde auch die Wasserabgabe während der Abbindezeit des Betons ermittelt. Es wurden Prüfkörper in folgender Zusammensetzung hergestellt I 100g Zement+300 g Sand+70 g Wasser.The values of the tests carried out can be seen in the two following tables. 1. Shear strength Polished surfaces Rautee surfaces kg / cm2 kg / cm2 Bonding bridge, consisting of: a) 50 ° / aiger PVA emulsion ......................... 4.1 48 b) 1 part 50o / oiger PVA emulsion -I- 1 part 50o / odger water- urea resin solution ........................ 9.6 45 z. Flexural strength After 3 days After 7 days moist storage moist storage broken after drying when damp Broken kg / cm 'kg / cm2 Bonding bridge, consisting of: a) 50a / aiger PVA emulsion ... ...... .... .. ...... .. .. 29 15.7 b) 1 part 50% PVA emulsion -I-1 part 50% aqueous urea resin solution ..... ... . . . ... . . . ... . . . .. 35 25.5 Since with fresh concrete, which has been applied in thin layers on the old concrete, especially on old concrete pavement, there is a risk that it will dry out too quickly and that the water necessary for setting will be withdrawn from the cement and it will then die of thirst the water release during the setting time of the concrete is determined. Test specimens were produced in the following composition: I 100 g cement + 300 g sand + 70 g water.

15 1I 10o g Zement -I- 300g Sand -f- 77 g Mischung aus 20 g PVA-Emulsion und 80 g Wasser. 15 1I 10o g cement -I- 300g sand -f- 77 g mixture of 20 g PVA emulsion and 80 g water.

III 100 g Zement -I- 300 g Sand -I- 77g Mischung aus 10 g P VA-Emulsion und 10g Harnstoffharzlösung 80 g Wasser.III 100 g cement -I- 300 g sand -I- 77g mixture of 10 g P VA emulsion and 10 g of urea resin solution and 80 g of water.

2o Die Prüfkörper gaben während einer Abbindezeit von 21 Tagen die in der nachfolgenden Tabelle angegebenen Wassermengen ab. ach 2 I 3 I 4 I 5 I 6 I 8 I 9 I 12 ( 21 Tagen I 14g 31g 36g 38g 40g 40g 41g 41g 46g II 10g 28g 34g 38g 39g 41g 42g 43g 49g III 10g 16g 19g 21g 22g 25g 26g 26g 33g Die Versuchsergebnisse zeigen, daß die Haftfestigkeit von Frischbeton an altem Beton und damit auch die Abscher- und Biegefestigkeit erheblich verbessert werden können, wenn man als Haftbrücke an Stelle einer reinen PVA-Emtilsion ein Gemisch aus einer PVA-Emulsion und einer wäßrigen Harnstoffharzlösung verwendet.2o The test specimens gave off the amounts of water given in the table below during a setting time of 21 days. Oh 2 I 3 I 4 I 5 I 6 I 8 I 9 I 12 (21 Days I 14g 31g 36g 38g 40g 40g 41g 41g 46g II 10g 28g 34g 38g 39g 41g 42g 43g 49g III 10g 16g 19g 21g 22g 25g 26g 26g 33g The test results show that the adhesive strength of fresh concrete on old concrete and thus also the shear and flexural strength can be considerably improved if a mixture of a PVA emulsion and an aqueous urea resin solution is used as the adhesive bridge instead of a pure PVA emulsion.

Die Vorteile des neuen Verfahrens zeigen stich besonders bei Ausbesserungsarbeiten an beschädigten Fahrbahndecken aus Beton.The advantages of the new process are particularly evident when it comes to repair work on damaged concrete pavements.

Eine Quellung der zwischen Frischbeton und altem Beton liegenden Haftbrücke und eine damit verbundene Lockerung der Verleimung tritt selbst bei starker Durchfeuchtung der Fahrbaihndecke nichtein, und dem Zement des Frischbetons verbleibt auch in dünnster Schicht noch genügend Wasser zur Abbindung.A swelling of the adhesive bridge between the fresh concrete and the old concrete and a related loosening of the glue occurs even with strong moisture penetration the road surface is not covered, and the cement of the fresh concrete remains even in the thinnest Layer still enough water to set.

Claims (1)

PATENTANSPRUCH: Verfahren zur haftfesten Verbindung von frischem mit altem Beton, insbesondere für Fahrbahndecken, dadurch gekennzeichnet, daß der alte Beton mit einer Mischung aus Polyvinylacetatemulsion und einer wäßrigen Lösung von Kondensationsharzen; vorzugsweise Harnstoffharz grundiert wird und/oder daß dem Anmachwasser des frischen Betons eine Mischung aus Polyvinylacetatemuilsion und wäßriger Lösung von Kondensationsharzen, vorzugsweise Harnstoffharz, zugesetzt wird. In Betracht gezogene Druckschriften: Deutsche Patentschriften Nr. 825 521, 966 648; Zeitschrift »Zement-Kglk=Gip,s «,1953, S.101 bis 105.PATENT CLAIM: Process for firmly bonding fresh with old concrete, especially for road surfaces, characterized in that the old Concrete with a mixture of polyvinyl acetate emulsion and an aqueous solution of Condensation resins; preferably urea resin is primed and / or that the Mixing water of the fresh concrete is a mixture of Polyvinylacetatemuilsion and aqueous solution of condensation resins, preferably urea resin, is added. Considered publications: German Patent Specifications No. 825 521, 966 648; Magazine »Zement-Kglk = Gip, s«, 1953, pp.101 to 105.
DEA21708A 1954-12-09 1954-12-09 Process for firmly bonding fresh and old concrete Pending DE1054900B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1213779B (en) * 1961-12-19 1966-03-31 Gruenau Gmbh Chem Fab Process for the homogeneous connection of old and fresh hydraulically setting building materials with the help of an organic binding agent
DE1223291B (en) * 1960-09-29 1966-08-18 Ruberoidwerke A G Process for connecting set and freshly made building materials containing hydraulic binders
FR2662191A1 (en) * 1990-05-21 1991-11-22 Setec Geotechnique Composition for impregnating the base layers of highway bodies for the effective adhesiveness of the surface course
EP2772594A1 (en) * 2013-02-07 2014-09-03 FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V. Building element made of concrete and building with this element

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE825521C (en) * 1950-10-25 1951-12-20 Badische Bau Und Kunststoff G Manufacture of components from anhydrite and plastic masses
DE966648C (en) * 1951-11-16 1957-08-29 Polychemie Chemie Ingenieur Ge Process for joining two layers and suitable dispersions for this

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE825521C (en) * 1950-10-25 1951-12-20 Badische Bau Und Kunststoff G Manufacture of components from anhydrite and plastic masses
DE966648C (en) * 1951-11-16 1957-08-29 Polychemie Chemie Ingenieur Ge Process for joining two layers and suitable dispersions for this

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1223291B (en) * 1960-09-29 1966-08-18 Ruberoidwerke A G Process for connecting set and freshly made building materials containing hydraulic binders
DE1213779B (en) * 1961-12-19 1966-03-31 Gruenau Gmbh Chem Fab Process for the homogeneous connection of old and fresh hydraulically setting building materials with the help of an organic binding agent
FR2662191A1 (en) * 1990-05-21 1991-11-22 Setec Geotechnique Composition for impregnating the base layers of highway bodies for the effective adhesiveness of the surface course
EP2772594A1 (en) * 2013-02-07 2014-09-03 FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V. Building element made of concrete and building with this element

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