WO1997044295A1 - Procede de re-alcalinisation a l'hydroxyde de calcium - Google Patents

Procede de re-alcalinisation a l'hydroxyde de calcium Download PDF

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Publication number
WO1997044295A1
WO1997044295A1 PCT/CH1997/000171 CH9700171W WO9744295A1 WO 1997044295 A1 WO1997044295 A1 WO 1997044295A1 CH 9700171 W CH9700171 W CH 9700171W WO 9744295 A1 WO9744295 A1 WO 9744295A1
Authority
WO
WIPO (PCT)
Prior art keywords
concrete
alkaline
reinforcement
ions
top layer
Prior art date
Application number
PCT/CH1997/000171
Other languages
German (de)
English (en)
Inventor
Hans Joachim Badzong
Original Assignee
Hans Joachim Badzong
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 Hans Joachim Badzong filed Critical Hans Joachim Badzong
Priority to EP97919236A priority Critical patent/EP0839123A1/fr
Publication of WO1997044295A1 publication Critical patent/WO1997044295A1/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
    • 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
    • C04B41/4505—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements characterised by the method of application
    • C04B41/4564—Electrolytic or electrophoretic processes, e.g. electrochemical re-alkalisation of reinforced concrete
    • C04B41/4566—Electrochemical re-alcalisation

Definitions

  • the carbonation area of the concrete edge zone (3-5cm concrete top layer with reinforcement layer) is found as a scattering area at a depth of up to approx. 30mm. Greater carbonation depths are rare and more than 40-50mm are practically never reached.
  • the purpose of the CH realizing process is to comprehend the above mentioned realizing processes observed in nature and to restore the alkaline milieu in the already carbonated concrete and in the reinforcement area Mittel electrochemically supported wet / dry cycles, the behavior in nature is reproduced in a time-lapse process and the carbonated edge zone area is restored to an alkaline state (realized).
  • the concrete surface can be provided with a seal in order to permanently maintain the realization
  • the cement stone in the finished concrete contains 10-15 vol% calcium hydroxide Ca (OH) 2 (gel water), corresponding to approx. 30-45 liters per m 3 concrete at carbonation depths of 20mm ( Carbonation Ca (OH) 2 + CO2 -> CaC ⁇ 3 + H2O) the concrete lacks about 0 5-1 liters per m 2 of surface in the upper layer.
  • the task of the CH realizing process is then to compensate for this deficiency from the core concrete reservoir
  • anode mats in the form of flooding cassettes or saturated, water-holding porous mats with inserted electrically conductive tissue in different sizes depending on the flat are attached to the concrete surface and connections for reinforcement are made as cathodes.
  • substances that improve conductivity are added to the water in the anode mat (for example potassium carbonate).
  • the electric field (E field) is built up with DC driving voltages of 10-50 volts, with a current of 3 depending on the object -5 A / m 2 concrete surface (approx. 2 A / m 2 reinforcement).
  • the E fields are to be adapted to the building conditions and requirements of the concrete surface, taking into account the building integration
  • the proof of effectiveness of the realcalization is carried out by checking the new alkalinity in the concrete top layer in 5mm layers and comparing it with the status before carrying out the process.
  • the aim is to restore the alkalinity at least 100%
  • the drawing shows the concrete edge zone of a wall facade with reinforcement and carbonated concrete top layer.
  • the arrangement of the E-field with anode mat, rectifier and reinforcement connection as well as the ion migration taking place with repassivation of the reinforcement surface and reactions are shown and the running mechanisms are given

Landscapes

  • Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Abstract

L'invention a pour objet un procédé pour le rétablissement du milieu alcalin dans les couches supérieures carbonatées du béton, par activation de l'hydroxyde de calcium (CH) du béton. En s'appuyant sur les processus naturels observés, on décrit un procédé électrochimique dans lequel on essaye d'obtenir, en utilisant des cycles de séchage et d'humidification, une ré-alcalinisation de la couche supérieure carbonatée et une re-passivation des aciers à béton qui, au point de vue alcalin, ne sont plus protégés de la corrosion. Dans ce procédé, il est entendu qu'on se réfère à des éléments de construction en béton de type conventionnel, renfermant comme composants, de la pâte de ciment durcie et du gravier, et présentant des pores capillaires. La pâte de ciment durcie alcaline, de pH 11-13, est modifiée chimiquement en fonction du temps, sous l'influence du CO2 de l'air, à partir de la surface du béton vers les profondeurs, en pâte de ciment durcie carbonatée, de pH 9-10. Cette dernière n'offre plus, contrairement à la pâte de ciment durcie alcaline, de protection contre la corrosion pour les aciers à béton, dans le cas des constructions en béton armé. Il es résulte des risques de corrosion croissants pour les constructions industrielles et, dans les domaines du bâtiment, du génie civil pour des constructions telles que des ponts. Une caractérisation, effectuée suffisamment à temps, du problème, et le rétablissement des conditions d'environn ement alcalines assurant la protection contre la corrosion des armatures du béton, contribuent à améliorer la durabilité du matériau de construction.
PCT/CH1997/000171 1996-05-19 1997-04-29 Procede de re-alcalinisation a l'hydroxyde de calcium WO1997044295A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97919236A EP0839123A1 (fr) 1996-05-19 1997-04-29 Procede de re-alcalinisation a l'hydroxyde de calcium

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH125996A CH692297A5 (de) 1996-05-19 1996-05-19 Calziumhydroxyd-Realkalisierungsverfahren.
CH1259/96 1996-05-19

Publications (1)

Publication Number Publication Date
WO1997044295A1 true WO1997044295A1 (fr) 1997-11-27

Family

ID=4206208

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1997/000171 WO1997044295A1 (fr) 1996-05-19 1997-04-29 Procede de re-alcalinisation a l'hydroxyde de calcium

Country Status (3)

Country Link
EP (1) EP0839123A1 (fr)
CH (1) CH692297A5 (fr)
WO (1) WO1997044295A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104849326A (zh) * 2015-04-16 2015-08-19 同济大学 一种混凝土钢筋腐蚀状态判定方法
CN112142363A (zh) * 2020-10-10 2020-12-29 杭州瑞鼎建材有限公司 一种自动收缩补偿的抗泛碱混凝土

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989008170A1 (fr) * 1988-02-26 1989-09-08 Jan Saelensminde Procede de traitement de beton
EP0401519A1 (fr) * 1989-06-09 1990-12-12 John B. Miller Procédé pour le traitement électrochimique de matériaux de construction poreux, en particulier pour le séchage et la réalcalinisation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989008170A1 (fr) * 1988-02-26 1989-09-08 Jan Saelensminde Procede de traitement de beton
EP0401519A1 (fr) * 1989-06-09 1990-12-12 John B. Miller Procédé pour le traitement électrochimique de matériaux de construction poreux, en particulier pour le séchage et la réalcalinisation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104849326A (zh) * 2015-04-16 2015-08-19 同济大学 一种混凝土钢筋腐蚀状态判定方法
CN112142363A (zh) * 2020-10-10 2020-12-29 杭州瑞鼎建材有限公司 一种自动收缩补偿的抗泛碱混凝土
CN112142363B (zh) * 2020-10-10 2021-12-28 杭州瑞鼎建材有限公司 一种自动收缩补偿的抗泛碱混凝土

Also Published As

Publication number Publication date
EP0839123A1 (fr) 1998-05-06
CH692297A5 (de) 2002-04-30

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