JPH07315959A - Electrochemical treatment of concrete - Google Patents
Electrochemical treatment of concreteInfo
- Publication number
- JPH07315959A JPH07315959A JP11304594A JP11304594A JPH07315959A JP H07315959 A JPH07315959 A JP H07315959A JP 11304594 A JP11304594 A JP 11304594A JP 11304594 A JP11304594 A JP 11304594A JP H07315959 A JPH07315959 A JP H07315959A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- electrode
- electrolyte solution
- external
- treatment
- 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.)
- Granted
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
- C04B41/53—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone involving the removal of at least part of the materials of the treated article, e.g. etching, drying of hardened concrete
- C04B41/5369—Desalination, e.g. of reinforced concrete
- C04B41/5376—Electrochemical desalination
-
- 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
- C04B41/72—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone involving the removal of part of the materials of the treated articles, e.g. etching
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Water Supply & Treatment (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
- Working Measures On Existing Buildindgs (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−トの電気化学的処理方法に関し、詳しくは、親水
性物質からなる電解質溶液保持材を用いたコンクリ−ト
の電気化学的処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of electrochemically treating a concrete containing a steel material therein, and more specifically, an electrochemical treatment of a concrete using an electrolyte solution holding material made of a hydrophilic substance. Regarding the method.
【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性が強く、また、強アルカリ性
であるので、その内部にある鋼材は、鋼材表面に不働態
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、構造物としての耐久性に疑問
が投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 passivation 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 durability of the structure has been questioned.
【０００３】このような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補修工
法が開示されている(特開平 1−176287号公報、特開平
2−302384号公報)。これらの方法は、コンクリ−トの表
面に電解質溶液と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、この被覆した塗布材料に電
極を埋設してコンクリ−トの内部の鉄筋とこの電極との
間に直流電流を流すことによって、コンクリ−トの内部
から電極に向かって塩化物イオンを泳動させてコンクリ
ートから除去し、その後に、前記電極と前記塗布材料と
を取り除くコンクリートの修復方法であり、セルロース
ファイバーからなる付着性塗布材料とアルカリ性溶液と
をコンクリート表面に付着させてこのアルカリ性溶液を
電気浸透を利用し、コンクリート内部へ浸透させること
で中性化を回復させる方法である。As a method for repairing such a deteriorated concrete structure, a repairing method using an electrochemical method has been disclosed (JP-A-1-176287, JP-A-1-176287).
2-302384 publication). In these methods, the surface of the concrete is temporarily coated with an adhesive coating material composed of an electrolyte solution and cellulose fibers, and an electrode is embedded in the coated coating material to rebar inside the concrete and this electrode. By flowing a direct current between and, chloride ions are migrated from the inside of the concrete toward the electrode to remove from the concrete, and then the electrode and the coating material are removed. There is a method of recovering the neutralization by adhering an adhesive coating material made of cellulose fiber and an alkaline solution on the surface of concrete, and utilizing this alkaline solution to permeate the inside of concrete by utilizing electroosmosis.
【０００４】しかしながら、これらの方法では、セルロ
ースファイバーと電解質溶液を吹付けることによりコン
クリート表面に設置した電極を被覆するため、吹付け作
業時におけるセルロースファイバーの周囲への飛散が起
こり、周辺環境を汚すことになる等の課題があった。ま
た、通常は電解質溶液としてアルカリ性の溶液が使われ
るため、吹き付け時に溶液の飛散がおこり、周辺環境を
汚すのみならず、作業員等の目や皮膚に触れると障害等
を引き起こすなどの課題があった。However, in these methods, since the electrodes installed on the concrete surface are covered by spraying the cellulose fibers and the electrolyte solution, the cellulose fibers are scattered around during the spraying work, and the surrounding environment is polluted. There was a problem such as that. In addition, since an alkaline solution is usually used as the electrolyte solution, the solution may scatter during spraying, which not only pollutes the surrounding environment but also causes problems such as contact with the eyes and skin of workers and other problems. It was
【０００５】本発明者は、前記課題を解決すべく種々の
検討を行なった結果、特定の方法を採用することによ
り、前記課題が解消し、コンクリート構造物の補修処理
などの電気化学的処理が充分に行い得る知見を得て本発
明を完成するに至った。As a result of various investigations to solve the above problems, the present inventor has solved the problems by adopting a specific method, and is able to perform electrochemical treatment such as repair treatment of concrete structures. The present invention has been completed with the knowledge that it can be carried out sufficiently.
【０００６】[0006]
【問題を解決するための手段】即ち、本発明は、コンク
リ−トの表面部に設置した電極を外部電極とし、コンク
リート内部の鋼材を内部電極とし、外部電極を含むコン
クリート表面及び／又は外部電極間のコンクリート表面
に、電解質溶液を含有する親水性物質からなる及び／又
は親水性処理を施してなる電解質溶液保持材を設置し、
該外部電極間及び／又は該外部電極と内部電極間に電流
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。That is, according to the present invention, an electrode installed on the surface of a concrete is an external electrode, a steel material inside concrete is an internal electrode, and a concrete surface including the external electrode and / or an external electrode. On the surface of the concrete in between, an electrolyte solution holding material made of a hydrophilic substance containing an electrolyte solution and / or subjected to a hydrophilic treatment is installed,
An electrochemical treatment method for concrete, characterized in that a current is passed between the external electrodes and / or between the external electrodes and the internal electrodes.
【０００７】以下、本発明を詳細に説明する。The present invention will be described in detail below.
【０００８】硬化したコンクリ−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
ている。そのため、コンクリ−トに電流を流すと、この
間隙水が電解質溶液の役割をして、コンクリ−ト自身が
持つ抵抗に応じた電流が流れる。しかしながら、コンク
リート表面が乾いていると、電流が流れにくいため、本
発明では、コンクリート表面に電解質溶液を供給する。Inside the hardened concrete, a saturated calcium hydroxide aqueous solution is sufficiently present as pore water. Therefore, when an electric current is applied to the concrete, the pore water acts as an electrolyte solution, and an electric current corresponding to the resistance of the concrete itself flows. However, when the concrete surface is dry, it is difficult for the electric current to flow. Therefore, in the present invention, the electrolyte solution is supplied to the concrete surface.
【０００９】電解質溶液とは、コンクリート中に浸透さ
せることにより、コンクリートの電気抵抗値を下げて電
気を流し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している溶
液である。The electrolyte solution is a solution used for lowering the electric resistance value of concrete to facilitate the flow of electricity by making it penetrate into concrete, and there are positive ions and negative ions in the solution. Solution.
【００１０】コンクリート表面に電解質溶液を供給する
手段として、本発明では、コンクリ−ト表面に親水性物
質からなる電解質溶液保持材を設置し、電解質溶液を保
持し、コンクリート表面に供給する。As a means for supplying the electrolyte solution to the concrete surface, in the present invention, an electrolyte solution holding material made of a hydrophilic substance is installed on the concrete surface to hold the electrolyte solution and supply it to the concrete surface.
【００１１】本発明で使用する親水性物質としては、不
織布などが使用できる。As the hydrophilic substance used in the present invention, non-woven fabric or the like can be used.
【００１２】ここで不織布とは、素材となる天然繊維又
は合成繊維などの繊維やフィラメントを粘着剤、加熱化
工、及び製縫等によって、積層したり、不規則に配列さ
せたり、もつれさせたりして作った生地で、電解質溶液
を保持することに優れているものである。その一例とし
てフェルト等が挙げられる。The term "nonwoven fabric" as used herein means that fibers or filaments such as natural fibers or synthetic fibers, which are raw materials, are laminated, irregularly arranged, or entangled with each other by an adhesive agent, heating treatment, sewing or the like. It is a dough made by making an excellent solution for holding an electrolyte solution. An example thereof is felt.
【００１３】ここで、繊維やフィラメントの材質として
は、無機質繊維、有機質繊維、及び金属質繊維等が考え
られるが、木綿等の天然繊維をはじめとする親水性の高
い繊維の使用が好ましい。また、親水性の低い繊維やフ
ィラメントでも、親水処理を施すことによって使用が可
能となる。この親水性の低い繊維やフィラメントとして
は、ポリエステル、ポリエステルビスコース、ポリプロ
ピレン、ナイロン、アクリル、レーヨン、ステンレス、
及びアラミド等が挙げられる。Here, as the material of the fibers and filaments, inorganic fibers, organic fibers, metallic fibers and the like can be considered, but it is preferable to use highly hydrophilic fibers such as natural fibers such as cotton. Further, even fibers or filaments having low hydrophilicity can be used by applying hydrophilic treatment. As the fibers and filaments having low hydrophilicity, polyester, polyester viscose, polypropylene, nylon, acrylic, rayon, stainless steel,
And aramid and the like.
【００１４】ここで、好ましい親水処理方法としては、
常温で１〜10％のエタノール水溶液に、24〜48時間処
理するエタノール処理方法、溶液濃度５〜10％の炭酸
ソーダや苛性ソーダなどのアルカリ脱脂剤を、常温で24
時間以上、40〜80℃で３〜４時間処理するアルカリ脱脂
処理方法、並びに、0.3〜2.0％濃度の、例えば、カル
ボン酸塩、硫酸エステル塩、スルホン酸塩、及びリン酸
エステル塩等のアニオン系界面活性剤を、常温で１〜２
時間処理する界面活性剤処理方法等が好ましく、特に、
界面活性剤処理方法が短時間で、エタノールに酔った
り、アルカリに侵されたりする危険性もなく好適であ
る。Here, as a preferred hydrophilic treatment method,
Aqueous solution of 1 to 10% ethanol at room temperature for 24 to 48 hours, and an alkaline degreasing agent such as sodium carbonate or caustic soda with a solution concentration of 5 to 10% at room temperature
Alkaline degreasing method of treating at 40 to 80 ° C. for 3 to 4 hours or more, and 0.3 to 2.0% concentration of anions such as carboxylates, sulfates, sulfonates, and phosphates 1 to 2 at room temperature with a surfactant
A surfactant treatment method or the like for time treatment is preferable, and particularly,
The method of treating with a surfactant is suitable in a short time without the risk of being drunk by ethanol or being attacked by alkali.
【００１５】不織布の形状は、ロール状や成形体いずれ
も使用可能である。ロール状の不織布は、コンクリート
表面に設置する場合、一部を固定するだけでコンクリー
ト表面に敷くことや、垂らすことが可能であり、木板等
で押さえつけることも可能である。また、成形体の不織
布は、そのまま一部を固定するだけで使用することがで
き、木板等で押さえつけることも可能である。さらに、
不織布は柔軟性があるので、湾曲したコンクリート又は
凹凸のあるコンクリート表面にも密着させることが可能
である。The non-woven fabric may be in the form of a roll or a molded product. When the roll-shaped non-woven fabric is installed on the concrete surface, it can be laid on the concrete surface by only fixing a part of it or can be hung down, and can also be pressed down by a wooden board or the like. Further, the non-woven fabric of the molded body can be used as it is by fixing a part thereof, and can also be pressed by a wooden board or the like. further,
Since the non-woven fabric is flexible, it can be adhered to curved concrete or uneven concrete surface.
【００１６】親水性物質の大きさや形状は、特に制限さ
れるものではなく、目的や作業手順に応じた大きさと形
状が使用できる。The size and shape of the hydrophilic substance are not particularly limited, and a size and shape suitable for the purpose and work procedure can be used.
【００１７】次に、コンクリ−トの表面部に設置する外
部電極について説明する。Next, the external electrodes installed on the surface of the concrete will be described.
【００１８】外部電極は、通常コンクリ−トの電気化学
的処理をする際、仮設するものであり、一般には正(プ
ラス)側になるため電気的な腐食作用が働く傾向があ
る。The external electrode is usually provided temporarily when the concrete is electrochemically treated, and since it is generally on the positive (plus) side, it tends to have an electrical corrosion action.
【００１９】本発明では、電流を流す期間が比較的短期
なため、外部電極として、普通の鉄筋や金網などの使用
も可能であるが、資源の有効と再利用を考えると、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、炭素繊維や炭素棒などの炭素質
物質、並びに、体積電気抵抗率が103Ω・cm以下の導電性
を有する有機高分子等である。これらのうち、チタンや
白金は、電気的な腐食に対して安定であるので好まし
い。また、炭素や有機高分子もほぼ安定である。なお、
通常のコンクリートの体積電気抵抗率は、103〜104Ω・c
m程度であるので、導電性を有する有機高分子として
は、その値以下、即ち、103Ω・cm以下が好ましく、102
Ω・cm以下がより好ましく、10Ω・cm以下が最も好まし
い。また、外部電極は、あらかじめ不織布内に固定され
ていても良い。この場合は、電極をコンクリート表面に
設置する手間が省けるので、省力化に役立つ。In the present invention, since the period of passing the electric current is relatively short, it is possible to use ordinary reinforcing bars, wire mesh, etc. as the external electrodes, but in view of effective resource utilization and reuse, electrical corrosion It is preferable to use those having high resistance to.
Specifically, titanium, a titanium alloy, platinum or the like or a metal plated with them, a carbonaceous substance such as carbon fiber or a carbon rod, and a volume electric resistivity having conductivity of 10 3 Ω · cm or less. Organic polymers and the like. Of these, titanium and platinum are preferable because they are stable against electrical corrosion. Also, carbon and organic polymers are almost stable. In addition,
The volume electric resistivity of ordinary concrete is 10 3 to 10 4 Ω ・ c.
Since it is about m, the organic polymer having conductivity is equal to or less than that value, that is, 10 3 Ωcm or less is preferable, and 10 2
Ω · cm or less is more preferable, and 10 Ω · cm or less is most preferable. Further, the external electrodes may be fixed in advance within the nonwoven fabric. In this case, the labor for installing the electrodes on the concrete surface can be saved, which is useful for labor saving.
【００２０】なお、本発明でコンクリ−トに流す電流値
は、特に限定されるものではないが、通常、コンクリ−
ト表面積当たり0.5〜10A/m2程度の電流が好ましい。The value of the current flowing through the concrete in the present invention is not particularly limited, but it is usually a concrete value.
A current of about 0.5 to 10 A / m 2 per surface area is preferable.
【００２１】[0021]
【実施例】以下、本発明を実施例に基づいてさらに説明
する。EXAMPLES The present invention will be further described below based on examples.
【００２２】実施例１ 高さ４×横40×厚み0.2ｍの鉄筋コンクリ−ト壁を部分
的にはつり、コンクリ−ト内部の鉄筋を内部電極とし、
コンクリ−ト表面にチタンメッシュを内蔵した不織布を
電解質溶液保持材の親水性物質Ａとして仮設した。親水
性物質Ａを25mm角の角材で、コンクリート壁の上部と下
部の２か所はさみ、プラスチックアンカーでその角材を
固定した。次に、コンクリート壁の上部に設置した角材
の下面に吸水用の穴あきパイプを設置して、電解質溶液
としてｐＨ12の水酸化カルシウム溶液を流し、親水性物
質Ａに一定量の電解質溶液を供給することにより、コン
クリートに電気が流れやすいようにした。これに、1.0A
/m2の直流電流を４週間流し、脱塩処理を行った。４週
間後、コンクリ−ト表面の電解質溶液保持材である親水
性物質Ａと外部電極を取り除き、コンクリ−トをコアリ
ングして、それに含まれる塩分量を測定したところ、コ
ンクリート中の塩分量は処理前4.5kg/m3であったもの
が、0.4kg/m3と１割以下に減少していることが確認さ
れ、コンクリートの改質処理が滞りなく行い得たことが
明らかであった。さらに、親水性物質Ａを用いたことに
より、周辺環境への汚染や作業員の負傷等の事故は発生
しなかった。Example 1 A reinforcing bar concrete wall having a height of 4 × width of 40 × thickness of 0.2 m was partially suspended, and the reinforcing bar inside the concrete was used as an internal electrode.
A non-woven fabric containing a titanium mesh on the concrete surface was temporarily provided as the hydrophilic substance A of the electrolyte solution holding material. The hydrophilic substance A was sandwiched between square pieces of 25 mm square, sandwiched between the upper and lower parts of the concrete wall, and the square pieces were fixed with plastic anchors. Next, a perforated pipe for water absorption is installed on the lower surface of the timber installed on the upper part of the concrete wall, a calcium hydroxide solution having a pH of 12 is caused to flow as an electrolyte solution, and a certain amount of the electrolyte solution is supplied to the hydrophilic substance A. This made it easier for electricity to flow through the concrete. To this, 1.0A
A direct current of / m 2 was passed for 4 weeks to perform desalting treatment. After 4 weeks, the hydrophilic substance A, which is the electrolyte solution holding material on the concrete surface, and the external electrode were removed, the concrete was cored, and the salt content in it was measured. What was 4.5 kg / m 3 before the treatment was confirmed to be 0.4 kg / m 3 and decreased to 10% or less, and it was clear that the modification treatment of concrete could be performed without delay. Further, by using the hydrophilic substance A, no accident such as contamination of the surrounding environment or injury of a worker occurred.
【００２３】＜使用材料＞ 親水性物質Ａ：不織布、日本フェルト工業社製商品名
「ニードルフェルトＧＴ」(材質ポリエステル)を２％濃度
のエタノールで24時間処理したもの。 外部電極：チタンメッシュ、エルテックアジアサービス
社製商品名「エルガードメッシュ＃210」<Materials used> Hydrophilic substance A: non-woven fabric, a product of Nippon Felt Industry Co., Ltd. under the trade name “Needle Felt GT” (material polyester) treated with 2% ethanol for 24 hours. External electrode: Titanium mesh, product name "L-Guard mesh # 210" manufactured by Eltec Asia Service Co., Ltd.
【００２４】＜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> Salinity: Japan Concrete Institute, “Analysis method of salt contained in hardened concrete” (JCI-SC4), “8.2. Compliant with potentiometric titration method using selective electrodes
【００２５】実施例２ 直径６mmで、間隔10cmのワイヤーメッシュを内蔵した不
織布の板状成形体を、親水性物質Ｂとしてコンクリート
表面に仮設し、2.0A/m2の電流を流したこと以外は実施
例１と同様に行った。その結果、コンクリート中の塩分
量は処理前5.2kg/m3であったものが、0.5kg/m3と１割以
下に減少していることが確認され、コンクリートの改質
処理が滞りなく行い得たことが明らかであった。Example 2 Except that a non-woven plate-shaped molded product having a diameter of 6 mm and a wire mesh with a spacing of 10 cm incorporated therein was temporarily placed on the concrete surface as the hydrophilic substance B, and a current of 2.0 A / m 2 was applied. The same procedure as in Example 1 was performed. As a result, it was confirmed that the amount of salt in the concrete was 5.2 kg / m 3 before treatment, but decreased to 0.5 kg / m 3 or less than 10%, and the concrete reforming treatment was performed without delay. It was clear that it was obtained.
【００２６】＜使用材料＞ 親水性物質Ｂ：板状成形体、縦１×横２×厚さ0.02ｍで
１層目はポリエステル不織布、ユニセル社製商品名「ラ
ンパスＰ−200ＴＫＷ」をカルボン酸塩0.5％で１時間処
理したもの、２層目はワイヤーメッシュ、３層目はアク
リル製フェルト、日本フェルト工業社製商品名「ニード
ルフェルトＧＡ」を硫酸エステル塩1.0％で２時間処理し
たもの<Materials to be used> Hydrophilic substance B: plate-shaped molded body, length 1 × width 2 × thickness 0.02 m, first layer is polyester non-woven fabric, unicell trade name “Lampus P-200TKW” is carboxylate 0.5% for 1 hour, 2nd layer is wire mesh, 3rd layer is acrylic felt, Nippon Felt Kogyo's trade name "Needle felt GA" is treated with sulfuric acid ester salt 1.0% for 2 hours
【００２７】比較例１ 実施例２で使用したワイヤーメッシュと同様のものを、
コンクリ−ト表面にプラスチックアンカーで固定し、さ
らに、その上からｐＨ12の水酸化カルシウム溶液とセル
ロースファイバーとを吹き付け、外部電極を内蔵した電
解質溶液保持材を形成した。なお、吹き付け作業では、
対象とする鉄筋コンクリート壁の周辺への、水酸化カル
シウム溶液やセルロースファイバーの飛散が激しく、吹
き付け完了後の清掃作業が大変であった。また、吹き付
け作業時間が長時間におよんだので、作業員がアルカリ
性雰囲気に曝されている時間が長く、手や足の皮膚にア
ルカリ溶液による傷害が見られた。Comparative Example 1 A wire mesh similar to that used in Example 2 was used.
The surface of the concrete was fixed with a plastic anchor, and a calcium hydroxide solution having a pH of 12 and cellulose fibers were further sprayed onto the surface to form an electrolyte solution holding material containing an external electrode. In the spraying work,
Calcium hydroxide solution and cellulose fibers were heavily scattered around the target reinforced concrete wall, and cleaning work after the completion of spraying was difficult. Further, since the spraying work time was long, the worker was exposed to the alkaline atmosphere for a long time, and the skin of the hands and feet was injured by the alkaline solution.
【００２８】実施例３ 電解質溶液保持材として、表１に示すように各種の材質
の不織布の親水処理を行い、その吸水性、保水性、及び
通電状態を測定したこと以外は実施例１と同様に行っ
た。結果を表１に併記する。Example 3 The same as Example 1 except that, as an electrolyte solution holding material, non-woven fabrics of various materials were subjected to hydrophilic treatment as shown in Table 1 and the water absorption, water retention, and energization state were measured. Went to. The results are also shown in Table 1.
【００２９】＜使用材料＞ ポリエステル：日本フェルト工業社製商品名「ニードル
フェルトＧＴ」 ナイロン ：日本フェルト工業社製商品名「ニードルフ
ェルトＧＮ」 アクリル ：日本フェルト工業社製商品名「ニードルフ
ェルトＧＡ」 ステンレス：日本フェルト工業社製商品名「ニードルフ
ェルトＧＳ」 ケブラー ：日本フェルト工業社製商品名「ニードルフ
ェルトＧＫ」 エタノール：和光純薬工業社製試薬一級 炭酸ナトリウム：和光純薬工業社製試薬一級 カルボン酸塩：ステアリン酸ナトリウム、和光純薬工業
社製 リン酸エステル：リン酸トリフェニル、和光純薬工業社
製試薬一級<Materials used> Polyester: Nippon Felt Industry Co., Ltd. trade name “Needle Felt GT” Nylon: Nippon Felt Industry Co., Ltd. trade name “Needle Felt GN” Acrylic: Nippon Felt Industry Co., Ltd. trade name “Needle Felt GA” Stainless : Nippon Felt Industry Co., Ltd. product name “Needle Felt GS” Kevlar: Nippon Felt Industry Co., Ltd. product name “Needle Felt GK” Ethanol: Wako Pure Chemical Industries, Ltd. reagent first grade sodium carbonate: Wako Pure Chemical Industries, Ltd. reagent first grade carboxylic acid Salt: Sodium stearate, Wako Pure Chemical Industries, Ltd. Phosphate ester: Triphenyl phosphate, Wako Pure Chemical Industries, Ltd. first-grade reagents
【００３０】＜測定方法＞ 吸水性 ：水道水を入れた容器を静置し、水面が水平
になった段階で電解質保持材を静かに深さ１cm入れ、水
道水が吸い上げられるのを静かに待つ。電解質保持材を
水道水内に入れてから、１時間後に水道水が吸い上げら
れた水面からの高さを測定、コンクリート表面に多少の凹凸が
あっても、その凹凸の影響を受けないようにするため、
吸い上げ高さ2.5mm未満を×、2.5mm以上を△、５mm以上
を○、及び10mm以上を◎とした。 保水性 ：長さ50×幅５×厚さ１cmの電解質保持材に
十分に水を含ませた後、傾斜角度45°のステンレス板上
に置き、水が垂れ落ちるのを待つ。１時間後に電解質保
持材に含まれている水の長さを電解質保持材の下端から
測定。保水性の判断基準は、水の長さが５cm未満のもの
を×、５cm以上のものを△、10cm以上のものを○、20cm
以上のものを◎とした。 通電状態 ：通電開始後24時間経過した時点の処理電圧
により判断。処理電圧が30Ｖ未満を◎、30Ｖ以上を○、
35Ｖ以上を△、感電時に死亡災害につながるおそれがあ
るので40Ｖ以上を×とした。<Measurement method> Water absorption: A container containing tap water is allowed to stand still, and when the water surface becomes horizontal, an electrolyte holding material is gently inserted to a depth of 1 cm, and waits gently for the tap water to be sucked up. . After putting the electrolyte holding material in tap water, measure the height from the surface of the water where the tap water was sucked up one hour later, so that even if there is some unevenness on the concrete surface, it will not be affected by the unevenness For,
The suction height of less than 2.5 mm was rated as ×, 2.5 mm or greater as Δ, 5 mm or greater as ○, and 10 mm or greater as ◎. Water retention: After the electrolyte holding material of length 50 × width 5 × thickness 1 cm is sufficiently moistened, place it on a stainless plate with an inclination angle of 45 ° and wait for the water to drip. After 1 hour, the length of water contained in the electrolyte holding material was measured from the lower end of the electrolyte holding material. The criteria for water retention are water with a length of less than 5 cm ×, 5 cm or more with △, 10 cm or more with ○, 20 cm
The above is marked with ◎. Energized state: Judged based on the processing voltage at the time when 24 hours have passed after the start of energization. ◎ when the processing voltage is less than 30V, ○ when 30V or more,
35V or more is △, and 40V or more is X because it may lead to a fatal accident when an electric shock occurs.
【００３１】[0031]
【表１】 [Table 1]
【００３２】実施例４ 高さ１×横５×厚み0.3ｍの鉄筋コンクリ−ト壁を用い
て試験を行った。このコンクリート壁の中性化深さは、
処理前には表面から約35mmであった。このコンクリート
表面の両側に、電解質溶液保持材として鉄筋メッシュを
内蔵した親水性物質Ａの不織布を用い、電解質溶液とし
て、炭酸リチウムと炭酸ナトリウムを主成分とするアル
カリ性水溶液を流し、0.8A/m2の直流電流を 1週間流
し、コンクリートのｐＨを回復させる再アルカリ化処理
を行ったこと以外は実施例１と同様に行った。１週間
後、コンクリート表面の電極を取り除き、コンクリート
をコアリングし、それに１％濃度のフェノールフタレイ
ン溶液を噴霧し、コンクリートの中性化深さを測定し
た。その結果、中性化部分はなく、コンクリートの再ア
ルカリ化処理が行えたことを確認した。さらに、不織布
を用いたことにより、周辺環境への汚染や作業員の負傷
等の事故は発生しなっかた。Example 4 A test was conducted using a reinforcing bar concrete wall having a height of 1 × width of 5 × thickness of 0.3 m. The neutralization depth of this concrete wall is
It was about 35 mm from the surface before treatment. On both sides of this concrete surface, a non-woven fabric of hydrophilic substance A containing a reinforcing steel mesh as an electrolyte solution holding material is used, and an alkaline aqueous solution containing lithium carbonate and sodium carbonate as main components is flown as an electrolyte solution to obtain 0.8 A / m 2 The same procedure as in Example 1 was performed, except that a direct current was applied for 1 week to carry out a re-alkalizing treatment for recovering the pH of the concrete. After one week, the electrode on the surface of the concrete was removed, the concrete was cored, and a phenolphthalein solution having a concentration of 1% was sprayed on the concrete to measure the neutralization depth of the concrete. As a result, it was confirmed that there was no neutralization part and that the concrete could be alkalized again. Furthermore, by using the non-woven fabric, no accident such as contamination of the surrounding environment or injury of workers occurred.
【００３３】＜使用材料＞ 鉄筋メッシュ：φ３mmの鉄筋を縦横100mm間隔で溶接し
た金網 炭酸リチウム：和光純薬工業社製試薬一級<Materials used> Reinforcing bar mesh: Wire mesh in which reinforcing bars of φ3 mm are welded at intervals of 100 mm in length and width Lithium carbonate: Wako Pure Chemical Industries, Ltd. first-grade reagent
【００３４】[0034]
【発明の効果】本発明では、コンクリート表面及び／又
はコンクリート中に直流電流を流すことによって、コン
クリートの改質を行う際、その改質効果を充分に引き出
すとともに、作業時の危険性や周辺環境への悪影響を低
減することができる。また、本発明では、不織布及び／
又はフェルトを用いることにより外部電極の取付けが非
常に簡便に行うことが可能となる。INDUSTRIAL APPLICABILITY According to the present invention, when a direct current is applied to the surface of concrete and / or through the concrete, when the concrete is modified, its modifying effect is sufficiently brought out, and the danger at the time of working and the surrounding environment. Can be reduced. Further, in the present invention, the nonwoven fabric and /
Alternatively, the use of felt makes it possible to attach the external electrode very easily.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 芦田 公伸 新潟県西頸城郡青海町大字青海2209番地 電気化学工業株式会社青海工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiminobu Ashida 2209 Aomi, Aomi-cho, Nishikubiki-gun, Niigata Prefecture Electrochemical Industry Co., Ltd. Aomi Plant
Claims (1)
外部電極とし、コンクリート内部の鋼材を内部電極と
し、外部電極を含むコンクリート表面及び／又は外部電
極間のコンクリート表面に、電解質溶液を含有する親水
性物質からなる及び／又は親水性処理を施してなる電解
質溶液保持材を設置し、該外部電極間及び／又は該外部
電極と内部電極間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 electrode installed on the surface of a concrete is used as an external electrode, a steel material inside concrete is used as an internal electrode, and a concrete surface including the external electrode and / or a concrete surface between the external electrodes contains an electrolyte solution. A concrete electricity characterized in that an electrolyte solution holding material made of a hydrophilic substance and / or subjected to a hydrophilic treatment is installed, and an electric current is passed between the external electrodes and / or between the external electrode and the internal electrode. Chemical treatment method.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11304594A JP3797677B2 (en) | 1994-05-26 | 1994-05-26 | Method for electrochemical treatment of concrete |
| TW084104829A TW374804B (en) | 1994-05-26 | 1995-05-16 | A method for electrochemically treating concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11304594A JP3797677B2 (en) | 1994-05-26 | 1994-05-26 | Method for electrochemical treatment of concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07315959A true JPH07315959A (en) | 1995-12-05 |
| JP3797677B2 JP3797677B2 (en) | 2006-07-19 |
Family
ID=14602099
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11304594A Expired - Fee Related JP3797677B2 (en) | 1994-05-26 | 1994-05-26 | Method for electrochemical treatment of concrete |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| JP2006327905A (en) * | 2005-05-30 | 2006-12-07 | Fuji Ps Corp | Method for salt removal from concrete structure |
| JP2008101426A (en) * | 2006-10-20 | 2008-05-01 | Denki Kagaku Kogyo Kk | Electrochemical processing method for concrete floor slab of asphalt pavement |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6498471B2 (en) * | 2015-02-23 | 2019-04-10 | フクビ化学工業株式会社 | Method for preventing ants of foundation structure |
-
1994
- 1994-05-26 JP JP11304594A patent/JP3797677B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| JP2006327905A (en) * | 2005-05-30 | 2006-12-07 | Fuji Ps Corp | Method for salt removal from concrete structure |
| JP2008101426A (en) * | 2006-10-20 | 2008-05-01 | Denki Kagaku Kogyo Kk | Electrochemical processing method for concrete floor slab of asphalt pavement |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3797677B2 (en) | 2006-07-19 |
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