JPH08319182A - Electrochemical treatment of concrete - Google Patents
Electrochemical treatment of concreteInfo
- Publication number
- JPH08319182A JPH08319182A JP7126394A JP12639495A JPH08319182A JP H08319182 A JPH08319182 A JP H08319182A JP 7126394 A JP7126394 A JP 7126394A JP 12639495 A JP12639495 A JP 12639495A JP H08319182 A JPH08319182 A JP H08319182A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- external electrode
- electrolytic solution
- electrochemical treatment
- current
- 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
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
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼材を内部に含むコン
クリートの電気化学的処理方法に関し、特にコンクリー
ト中の塩分を電気化学的に除去する方法、及び中性化し
たコンクリートにアルカリ性溶液を供給する方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrochemical treatment method for concrete containing a steel material inside, and more particularly to a method for electrochemically removing salt in concrete, and supplying an alkaline solution to neutralized concrete. On how to do.
【０００２】[0002]
【従来の技術とその課題】コンクリートは、一般には、
種々の環境に対する抵抗力が強く、また、強アルカリ性
であるので、その内部にある鋼材は、鋼材表面に不動態
被膜を形成して腐食から保護され、そのために、コンク
リート構造物は耐久性のある永久構造物であると考えら
れてきた。しかしながら、この永久構造物と考えられて
きたコンクリート構造物も、中性化や塩害などの原因に
よりその耐久性が低下し、構造物としての寿命に疑問が
なげかけられるようになってきた。[Prior art and its problems] Concrete is generally
Due to its strong resistance to various environments and its strong alkalinity, the steel material inside it is protected from corrosion by forming a passive film on the steel surface, which makes the concrete structure durable. It has been considered to be a permanent structure. However, the durability of the concrete structure, which has been considered to be the permanent structure, is deteriorated due to causes such as neutralization and salt damage, and the life of the structure has become questionable.
【０００３】このように劣化したコンクリート構造物を
補修する方法として、電気化学的な手法を用いた方法が
提案されている（特開平1-176287号公報、特開平2-3023
84号公報、特開平3-93682 号公報、特開平3-93681 号公
報）。As a method for repairing such a deteriorated concrete structure, a method using an electrochemical method has been proposed (JP-A-1-176287, JP-A-2-3023).
84, JP-A-3-93682, JP-A-3-93681).
【０００４】これらの方法では、電解質溶液保持材料と
して、コンクリート表面にセルロースファイバーからな
る付着性塗布材料を一時的に被覆し、該材料に電解質溶
液を塗布する方法、またはコンクリートの表面に電解質
溶液保持材料としての容器を設け、当該容器内に電解質
溶液を満たし、当該電解質溶液保持材中に電極を埋没さ
せ、通電することにより、電気化学的処理を行うもので
ある。しかしながら、これらの方法では、電解質溶液保
持材と電極を別々に用意し、設置しなければならず、材
料、及び部品数が多いのでコストがかかり、また作業す
る上で煩雑であるという課題があった。In these methods, as an electrolyte solution holding material, a method of temporarily coating a concrete surface with an adhesive coating material composed of cellulose fibers and coating the material with an electrolyte solution, or holding the electrolyte solution on the surface of concrete An electrochemical treatment is performed by providing a container as a material, filling the container with an electrolyte solution, immersing the electrode in the electrolyte solution holding material, and energizing the electrode. However, in these methods, the electrolyte solution holding material and the electrode have to be separately prepared and installed, which is costly because of the large number of materials and parts, and there is a problem in that it is complicated in working. It was
【０００５】本発明者らは、前記課題を解決すべく種々
検討した結果、コンクリート構造物の表面に導電性を有
する電解質溶液保持材料を設置し、これを外部電極とす
ることによって、前記課題を解決し、安価でかつ工期短
縮等の効果が得られることを見出し、本発明を完成する
に至った。As a result of various studies to solve the above-mentioned problems, the inventors of the present invention have achieved the above-mentioned problems by installing an electrolyte solution holding material having conductivity on the surface of a concrete structure and using it as an external electrode. As a result, they have found that they are inexpensive and that the effects of shortening the construction period can be obtained, and have completed the present invention.
【０００６】[0006]
【問題を解決する為の手段】即ち、本発明は、コンクリ
ート構造物の表面に外部電極として導電性を有する電解
質溶液保持材料を設置し、該材料内に電解質溶液を満た
し、コンクリート内部の鋼材を内部電極とし、外部電極
間及び／又は外部電極と内部電極に電流を流すことを特
徴とするコンクリートの電気化学的処理方法である。[Means for Solving the Problems] That is, according to the present invention, an electrolytic solution holding material having conductivity is installed as an external electrode on the surface of a concrete structure, and the electrolytic solution is filled in the material to fix the steel material inside the concrete. An electrochemical treatment method for concrete, which comprises using internal electrodes and applying a current between the external electrodes and / or flowing between the external electrodes and the internal electrodes.
【０００７】以下、本発明を詳細に説明する。一般に硬
化したコンクリート内部には、飽和状態の水酸化カルシ
ウム水溶液が間隙水として充分に存在しており、コンク
リートに電圧を印加すると、この間隙水が電解質溶液の
役割をして、コンクリートに電流が流れる。さらに、こ
のコンクリートに電解質溶液を供給して電流がさらに流
れやすくすることは、コンクリートの電気化学的処理上
好ましい。Hereinafter, the present invention will be described in detail. Generally, saturated calcium hydroxide aqueous solution is sufficiently present as interstitial water inside hardened concrete, and when a voltage is applied to the concrete, the interstitial water acts as an electrolyte solution and an electric current flows through the concrete. . Furthermore, it is preferable in terms of electrochemical treatment of concrete to supply an electrolyte solution to this concrete to make it easier for electric current to flow.
【０００８】本発明では、コンクリート構造物の表面に
導電性を有する電解質溶液保持材料を設置し外部電極と
して用いる。より詳しくは、電気化学的処理を施すコン
クリート表面に板状あるいはシート状の導電性材料を設
置し、該導電性材料とコンクリート面とにできる空間と
の間に電解質溶液を供給し、又は、導電性を有する繊維
状材料に電解質溶液を供給し、通電を行う。以下、前記
板状あるいはシート状の導電性材料、及び前記導電性を
有する繊維状材料を総称して、該外部電極という。In the present invention, an electrolyte solution holding material having conductivity is installed on the surface of a concrete structure and used as an external electrode. More specifically, a plate-like or sheet-like conductive material is installed on the surface of concrete to be subjected to electrochemical treatment, and an electrolyte solution is supplied between the conductive material and the space formed on the concrete surface, or The electrolyte solution is supplied to the fibrous material having the property to conduct electricity. Hereinafter, the plate-shaped or sheet-shaped conductive material and the conductive fibrous material are collectively referred to as the external electrodes.
【０００９】本発明で使用する該外部電極の材質として
は、導電性を有するものであれば、特に限定されるもの
ではないが、本発明では、電気的な腐食に対する抵抗性
が高いものの使用が好ましい。具体的には、チタン、チ
タン合金、及び白金等又は、それらでメッキされた金
属、炭素、並びに体積抵抗率が１０3 Ω・cm以下の導電
性を有する高分子材料である。但し、該外部電極が前記
板状材料の場合、コンクリートの電気化学的処理を施す
期間が短い場合や材料の厚みを増すことで材料の腐食に
よる体積減少を補う場合には、安価な鉄類を用いること
ができる。The material of the external electrode used in the present invention is not particularly limited as long as it has conductivity, but in the present invention, a material having high resistance to electrical corrosion is used. preferable. Specifically, it is titanium, titanium alloy, platinum or the like, or a metal plated with them, carbon, and a polymer material having conductivity with a volume resistivity of 10 3 Ω · cm or less. However, when the external electrode is the plate-like material, inexpensive irons are used when the electrochemical treatment of concrete is short, or when the thickness of the material is increased to compensate for the volume reduction due to corrosion of the material. Can be used.
【００１０】また、該外部電極が前記板状材料の場合、
その形状としては、電解質溶液を保持できるものであれ
ば、その形状は特に限定されるものではないが、電気化
学的処理を施すコンクリートの形状にあわせて製作、取
付することが好ましい。例えば、電気化学的処理を施す
コンクリートの形状が平面であれば、平面とし、曲面状
であれば、曲面状とすることが好ましい。その厚みにつ
いても電解質溶液を保持し、保持することで破壊や液漏
れが生じない厚みであれば、その厚みについては特に限
定されるものではない。あるいは、形状を工夫したり、
同一材料や同一材料でなくても補強材との組み合わせを
行うことにより、耐圧力性を確保することが可能であ
る。また、該外部電極の設置にあたっては、電気化学的
処理を施すコンクリート全てを１つの該外部電極で対処
しても良いが、作業性を向上させるためには、複数の該
外部電極を用いて電気化学的処理を行うことが好まし
い。この際、該外部電極相互の連結を導電性を有する材
料で連結することにより、電気材料としてのリード線の
設置を省略することができる。更に、該外部電極相互間
での電解質溶液の流通を確保するために配管類を設置す
る場合は、配管類を導電性とすることは、作業性を向上
させる上で更に好ましい。When the external electrode is the plate-shaped material,
The shape is not particularly limited as long as it can hold the electrolyte solution, but it is preferably manufactured and attached according to the shape of the concrete to be subjected to the electrochemical treatment. For example, if the shape of the concrete to be subjected to the electrochemical treatment is flat, it is preferably flat, and if it is curved, it is preferably curved. The thickness of the electrolyte solution is not particularly limited as long as it holds the electrolyte solution and does not cause breakage or liquid leakage when held. Or devise the shape,
Even if the same material or not the same material is used, it is possible to ensure pressure resistance by combining it with a reinforcing material. In addition, when installing the external electrodes, all of the concrete to be subjected to the electrochemical treatment may be dealt with by the single external electrode. It is preferable to carry out a chemical treatment. At this time, by connecting the external electrodes to each other with a conductive material, it is possible to omit the installation of the lead wire as an electric material. Furthermore, when piping is installed in order to secure the circulation of the electrolyte solution between the external electrodes, it is more preferable to make the piping conductive so as to improve workability.
【００１１】また、該外部電極が前記繊維状材料の場
合、その形状としては、電解質溶液を保持できるもので
あれば、その形状は特に限定されるものではないが、電
気化学的処理を施すコンクリートの形状にあわせて取付
することが好ましい。例えば、電気化学的処理を施すコ
ンクリートの形状が平面であれば、平面とし、曲面状で
あれば、曲面状に取付ることが好ましい。その厚みにつ
いても電解質溶液を保持し、保持することで破壊や変形
が生じない厚みであれば、その厚みについては特に限定
されるものではない。あるいは、桟木等の補強材との組
み合わせを行うことは、破損や変形を抑制することでよ
り好ましい。また、該外部電極の設置にあたっては、電
気化学的処理を施すコンクリート全てを１つの該外部電
極で対処しても良いが、処理面積が大きい場合、作業性
を向上させるためには、複数の該外部電極を用いて電気
化学的処理を行うことが好ましい。この際、該外部電極
相互の連結を前記繊維状の電極を重ね合わせることによ
り、電気材料としてのリード線の設置を省略することが
できる。When the external electrode is made of the fibrous material, its shape is not particularly limited as long as it can hold the electrolyte solution, but concrete subjected to electrochemical treatment is not particularly limited. It is preferable to attach it according to the shape of. For example, if the shape of the concrete to be subjected to the electrochemical treatment is flat, it is preferably flat, and if it is curved, it is preferable to mount it on a curved surface. The thickness of the electrolyte solution is not particularly limited as long as it holds the electrolyte solution and is not broken or deformed by holding the electrolyte solution. Alternatively, it is more preferable to combine it with a reinforcing material such as a pier because it suppresses damage and deformation. Further, when installing the external electrodes, all of the concrete to be subjected to the electrochemical treatment may be dealt with by the one external electrode, but if the treated area is large, in order to improve workability, a plurality of It is preferable to carry out the electrochemical treatment using external electrodes. At this time, by connecting the external electrodes to each other by overlapping the fibrous electrodes, it is possible to omit the installation of a lead wire as an electric material.
【００１２】また、該外部電極が前記板状材料の場合、
電気化学的処理を施すコンクリート構造物と該外部電極
との離隔距離は、電解質溶液を保持させるのに支障の無
い距離であれば、特に限定するものではないが、電解質
溶液の節約や、電気化学的処理を施すコンクリート構造
物に均等に電流を流すために、０. ２ｃｍ〜３０ｃｍ程
度の範囲が好ましい。さらに、均等に電流を流すために
は、該外部電極と電気化学的処理を施すコンクリート構
造物との離隔距離を均一に近いものにすることは、特に
好ましい。When the external electrode is the plate-shaped material,
The separation distance between the concrete structure subjected to the electrochemical treatment and the external electrode is not particularly limited as long as it is a distance that does not hinder the holding of the electrolytic solution, but the saving of the electrolytic solution and the electrochemical In order to apply an electric current evenly to the concrete structure to be subjected to the mechanical treatment, the range of about 0.2 cm to 30 cm is preferable. Furthermore, in order to flow the current evenly, it is particularly preferable to make the separation distance between the external electrode and the concrete structure to be subjected to the electrochemical treatment close to uniform.
【００１３】具体的には、１台、あるいは複数の電源装
置でコンクリートの電気化学的処理を行う場合、その電
源装置毎に電気的に接続される該外部電極と電気化学的
処理を施すコンクリート構造物との離隔距離の最大値と
最小値との比が１００％〜１０００％であり、更に好ま
しくは、１００〜３００％である。または、この最大値
と最小値との比の条件を適用できる面積が処理面積全体
の８０％以上であれば、電気化学処理をする際に問題は
生じない。Specifically, when the electrochemical treatment of concrete is performed by one or a plurality of power supply devices, the external electrode electrically connected to each power supply device and the concrete structure for performing the electrochemical treatment The ratio between the maximum value and the minimum value of the separation distance from the object is 100% to 1000%, more preferably 100 to 300%. Alternatively, if the area to which the condition of the ratio of the maximum value and the minimum value can be applied is 80% or more of the entire processing area, no problem occurs in the electrochemical processing.
【００１４】また、該外部電極が前記繊維状材料の場
合、前記繊維状材料は、電気化学的処理を施すコンクリ
ート表面に接触させて、あるいは、前記繊維状材料とコ
ンクリート表面に電解質溶液が表面張力によって存在す
る様に設置する。When the external electrode is the fibrous material, the fibrous material is brought into contact with a concrete surface to be subjected to an electrochemical treatment, or the fibrous material and the concrete surface are covered with an electrolyte solution by surface tension. Install so that it exists.
【００１５】該外部電極が前記板状材料の場合、該外部
電極は、アンカー類や接着剤、あるいは、支持棒等でコ
ンクリート面に取り付ける。この取付けに際し、保水性
を向上させるためのパッキンや樹脂類を該外部電極に取
付け、あるいは、コンクリート面との間に保持させるこ
とで、更に保水性の良い該外部電極としての機能をもた
せることができる。When the external electrode is the plate-shaped material, the external electrode is attached to the concrete surface with an anchor, an adhesive, a support rod or the like. At the time of this attachment, packing or resins for improving water retention can be attached to the external electrode or held between the external electrode and the concrete surface to have a function as the external electrode having even better water retention. it can.
【００１６】また、該外部電極が前記繊維状材料の場
合、該外部電極は、プラスチックアンカー、桟木等の非
導電性材料や接着剤、あるいは、支持棒等でコンクリー
ト面に取り付ける。When the external electrode is the fibrous material, the external electrode is attached to the concrete surface with a non-conductive material such as a plastic anchor or a splint, an adhesive, or a support rod.
【００１７】本発明で使用する電解質溶液とは、コンク
リート中に浸透することにより、コンクリートの電気抵
抗値を下げて、電気を流れやすくするために用いる溶液
のことであり、溶液中にプラスイオンやマイナスイオン
が存在する溶液である。好ましい電解質溶液は、アルカ
リ性又は中性の溶液である。具体的には、井戸水、水道
水、及び河川水等が使用できるが、各種のアルカリ金属
塩やアルカリ土類金属塩などの水溶液を使用することが
好ましい。ここでアルカリ金属塩としては、例えば、リ
チウム、ナトリウム、及びカリウムなどのアルカリ金属
塩や、カルシウムやマグネシウムなどのアルカリ土類金
属塩などが挙げられる。このうち、リチウム、ナトリウ
ム、カルシウム、及びマグネシウムの塩の使用が好まし
い。また、アルミニウムの塩の使用も可能である。The electrolyte solution used in the present invention is a solution used to reduce the electric resistance value of concrete by making it penetrate into the concrete to facilitate the flow of electricity. It is a solution containing negative ions. The preferred electrolyte solution is an alkaline or neutral solution. Specifically, well water, tap water, river water, etc. can be used, but it is preferable to use an aqueous solution of various alkali metal salts or alkaline earth metal salts. Examples of the alkali metal salt include alkali metal salts such as lithium, sodium, and potassium, and alkaline earth metal salts such as calcium and magnesium. Of these, the use of lithium, sodium, calcium, and magnesium salts is preferable. It is also possible to use aluminum salts.
【００１８】本発明で流す直流電流は、特に限定される
ものではないがコンクリート表面積当たり０．５Ａ／ｍ
2 以上で、鉄筋表面積当たり１０Ａ／ｍ2 以下となるよ
うにに制御することが好ましい。The direct current flowing in the present invention is not particularly limited, but is 0.5 A / m per concrete surface area.
2 or more, it is preferable to control the to be equal to or less than rebar surface area per 10A / m 2.
【００１９】[0019]
【実施例】以下、本発明の実施例に基づいて説明する
が、本発明はこれに限定されるものではない。 実施例１ 高さ１. ５ｍ、幅１０ｍ、厚さ２０ｃｍの鉄筋コンクリ
ートの壁１枚を用い、電気化学的処理の１つである脱塩
処理を行った。この壁のコンクリートは、海砂を骨材と
して使用していたために、コンクリート中に３ｋｇ／ｍ
3 の塩分を含有し、鉄筋の腐食が発生していた。該外部
電極が前記板状材料の場合として、高さ１. ４ｍ、幅３
ｍ、厚さ５ｍｍの鉄板の左右及び下方に幅２ｃｍ、厚さ
２ｃｍのゴム製パッキンを取付けたものを３個用いた。
この該外部電極をコンクリート壁面に治具及びホールイ
ンアンカーを用いて取付け、該外部電極それぞれには、
ＡＣ／ＤＣコンバーター日本スタビライザー工業社製直
流定電流電源装置商品名「ＭＣＲ−２９−２５０」に接
続してプラスの配線を行った。そして、該外部電極とコ
ンクリート壁面が作る空間に電解質溶液である水酸化カ
ルシウム溶液を充満させた。なお、コンクリート内部の
鉄筋には、あらかじめ白色被覆のリード線を取り付けて
あり、このリード線はＡＣ／ＤＣコンバーターのマイナ
ス側端子に接続した。しかる後、通電を開始したとこ
ろ、電流密度はコンクリート表面積当たり、平均１Ａ／
ｍ2 であった。この状態で４週間電流を流した後、コン
クリート中の塩分を測定したところ、塩分量は、処理前
の３ｋｇ／ｍ3 から１ｋｇ／ｍ3 に低下させることがで
きた。尚、通電期間中は、３日に１回、溶液を新しいも
のと取り替えた。この一連の作業で仮設した材料は該外
部電極、及び周辺材料のみであり、既存技術の様に、電
解質溶液保持材、電極、及び周辺材料の仮設をしないで
実施できた。EXAMPLES The present invention will be described below based on examples, but the present invention is not limited thereto. Example 1 A single reinforced concrete wall having a height of 1.5 m, a width of 10 m, and a thickness of 20 cm was used to perform a desalting treatment, which is one of the electrochemical treatments. The concrete of this wall was 3 kg / m in the concrete because sea sand was used as an aggregate.
It contained a salt content of 3 and had corrosion of the rebar. When the external electrode is the plate-shaped material, the height is 1.4 m and the width is 3 m.
Three pieces each having a rubber packing with a width of 2 cm and a thickness of 2 cm attached to the left and right and below the iron plate having a thickness of m and a thickness of 5 mm were used.
This external electrode is attached to a concrete wall surface using a jig and a hole-in anchor, and each external electrode is
AC / DC converter The positive wiring was performed by connecting to the direct current constant power supply device brand name "MCR-29-250" made by Japan Stabilizer Industry Co., Ltd. Then, the space formed by the external electrode and the concrete wall surface was filled with a calcium hydroxide solution as an electrolyte solution. A white-coated lead wire was previously attached to the reinforcing bar inside the concrete, and this lead wire was connected to the negative terminal of the AC / DC converter. Then, when energization was started, the current density was 1 A / average per surface area of concrete.
m 2 . After applying an electric current for 4 weeks in this state, when the salt content in the concrete was measured, the salt content could be reduced from 3 kg / m 3 before the treatment to 1 kg / m 3 . During the energization period, the solution was replaced with a new solution once every three days. The material temporarily installed in this series of operations was only the external electrode and the peripheral material, and it could be carried out without temporary installation of the electrolyte solution holding material, the electrode and the peripheral material as in the existing technology.
【００２０】実施例２ 実施例１と同様、高さ１. ５ｍ、幅１０ｍ、厚さ２０ｃ
ｍの鉄筋コンクリートの壁１枚を用い、電気化学的処理
の１つである脱塩処理を行った。この壁のコンクリート
は、海砂を骨材として使用していたために、コンクリー
ト中に３ｋｇ／ｍ3 の塩分を含有し、鉄筋の腐食が発生
していた。該外部電極が前記繊維状材料の場合として、
高さ１. ４ｍ、幅１０ｍ、厚さ約５ｍｍのカーボンファ
イバーを用いた。この該外部電極をコンクリート壁面に
プラスチックアンカーおよび桟木を用いて取付け、該外
部電極の四隅に、ＡＣ／ＤＣコンバーター日本スタビラ
イザー工業社製直流定電流電源装置商品名「ＭＣＲ−２
９−２５０」に接続してプラスの配線を行った。そし
て、該外部電極に電解質溶液であるホウ酸リチウム溶液
を供給した。なお、コンクリート内部の鉄筋には、あら
かじめ白色被覆のリード線を取り付けてあり、このリー
ド線はＡＣ／ＤＣコンバーターのマイナス側端子に接続
した。しかる後、通電を開始したところ、電流密度はコ
ンクリート表面積当たり、平均１Ａ／ｍ2 であった。こ
の状態で４週間電流を流した後、コンクリート中の塩分
を測定したところ、塩分量は、処理前の３ｋｇ／ｍ3 か
ら１ｋｇ／ｍ3 に低下させることができた。尚、通電期
間中は、２日に１回、溶液を追加供給した。この一連の
作業で仮設した材料は該外部電極、及び周辺材料のみで
あり、既存技術の様に、電解質溶液保持材、電極、及び
周辺材料の仮設をしないで実施できた。Example 2 As in Example 1, height 1.5 m, width 10 m, thickness 20 c
Using one m of reinforced concrete wall, desalting treatment, which is one of the electrochemical treatments, was performed. Since the concrete of this wall used sea sand as an aggregate, the concrete contained a salt content of 3 kg / m 3 and corrosion of the reinforcing bar occurred. When the external electrode is the fibrous material,
A carbon fiber having a height of 1.4 m, a width of 10 m and a thickness of about 5 mm was used. This external electrode is attached to a concrete wall surface using a plastic anchor and a splint, and AC / DC converter DC constant current power supply product name "MCR-2" manufactured by Japan Stabilizer Industry Co., Ltd. is provided at four corners of the external electrode.
9-250 "and positive wiring was performed. Then, a lithium borate solution as an electrolyte solution was supplied to the external electrode. A white-coated lead wire was previously attached to the reinforcing bar inside the concrete, and this lead wire was connected to the negative side terminal of the AC / DC converter. Then, when the energization was started, the current density was 1 A / m 2 on average per surface area of concrete. After applying an electric current for 4 weeks in this state, the salt content in the concrete was measured. As a result, the salt content could be reduced from 3 kg / m 3 before the treatment to 1 kg / m 3 . During the energization period, the solution was additionally supplied once every two days. The material temporarily installed in this series of operations was only the external electrode and the peripheral material, and it could be carried out without temporary installation of the electrolyte solution holding material, the electrode, and the peripheral material as in the existing technology.
【００２１】＜測定方法＞ 塩分量 ：社団法人 日本コンクリート工学協会「硬
化コンクリート中に含まれる塩分の分析方法」（ＪＣＩ
−ＳＣ４）の「８．全塩分定量方法」の「８. ２塩化物
イオン選択性電極を用いた電位差滴定法」に準拠<Measurement method> Salt content: Japan Concrete Institute, "Analysis method of salt contained in hardened concrete" (JCI
-SC4) “8. Total salt determination method”, “8.2 Potentiometric method using chloride ion selective electrode”
【００２２】[0022]
【発明の効果】本発明では、コンクリート構造物の表面
に外部電極として導電性を有する電解質溶液保持材料を
設置し、該材料内に電解質溶液を満たし、コンクリート
内部の鋼材を内部電極とし、外部電極間及び／又は外部
電極と内部電極に電流を流すことによりコンクリートの
電気化学的処理を行う場合、該外部電極を用いること
で、作業性が良く、安価でかつ工期短縮等の効果を奏す
る。According to the present invention, a conductive electrolyte solution holding material is installed as an external electrode on the surface of a concrete structure, the material is filled with the electrolytic solution, and the steel material inside the concrete is used as the internal electrode. When electrochemical treatment of concrete is performed by applying a current to the space and / or the external electrode and the internal electrode, the use of the external electrode provides the effects of good workability, low cost, and shortened construction period.
Claims (1)
して導電性を有する電解質溶液保持材料を設置し、該材
料内に電解質溶液を満たし、コンクリート内部の鋼材を
内部電極とし、外部電極間及び／又は外部電極と内部電
極に電流を流すことを特徴とするコンクリートの電気化
学的処理方法。1. An electrolytic solution holding material having conductivity is installed as an external electrode on the surface of a concrete structure, the electrolytic solution is filled in the material, and a steel material inside the concrete is used as an internal electrode, and between the external electrodes and / or A method for electrochemically treating concrete, characterized in that an electric current is applied to the outer electrode and the inner electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7126394A JPH08319182A (en) | 1995-05-25 | 1995-05-25 | Electrochemical treatment of concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7126394A JPH08319182A (en) | 1995-05-25 | 1995-05-25 | Electrochemical treatment of concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08319182A true JPH08319182A (en) | 1996-12-03 |
Family
ID=14934062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7126394A Pending JPH08319182A (en) | 1995-05-25 | 1995-05-25 | Electrochemical treatment of concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08319182A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002505996A (en) * | 1998-03-09 | 2002-02-26 | シュヴァルツ，ヴォルフガング | Conductive microcapillary composite matrix and method of making the same |
| US6398945B1 (en) | 1999-07-22 | 2002-06-04 | Infrastructure Repair Technologies, Inc. | Method of treating corrosion in reinforced concrete structures by providing a uniform surface potential |
| JP2008101426A (en) * | 2006-10-20 | 2008-05-01 | Denki Kagaku Kogyo Kk | Electrochemical processing method for concrete floor slab of asphalt pavement |
-
1995
- 1995-05-25 JP JP7126394A patent/JPH08319182A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002505996A (en) * | 1998-03-09 | 2002-02-26 | シュヴァルツ，ヴォルフガング | Conductive microcapillary composite matrix and method of making the same |
| US6398945B1 (en) | 1999-07-22 | 2002-06-04 | Infrastructure Repair Technologies, Inc. | Method of treating corrosion in reinforced concrete structures by providing a uniform surface potential |
| JP2008101426A (en) * | 2006-10-20 | 2008-05-01 | Denki Kagaku Kogyo Kk | Electrochemical processing method for concrete floor slab of asphalt pavement |
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