JPH04297643A - Reinforced concrete structure and structural member, and electric protection method for reinforced concrete - Google Patents
Reinforced concrete structure and structural member, and electric protection method for reinforced concreteInfo
- Publication number
- JPH04297643A JPH04297643A JP3084557A JP8455791A JPH04297643A JP H04297643 A JPH04297643 A JP H04297643A JP 3084557 A JP3084557 A JP 3084557A JP 8455791 A JP8455791 A JP 8455791A JP H04297643 A JPH04297643 A JP H04297643A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- reinforced concrete
- reinforcing steel
- metal
- structural member
- 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
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims description 22
- 239000004567 concrete Substances 0.000 claims abstract description 63
- 229910052751 metal Inorganic materials 0.000 claims abstract description 42
- 239000002184 metal Substances 0.000 claims abstract description 42
- 239000011248 coating agent Substances 0.000 claims abstract description 38
- 238000000576 coating method Methods 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 30
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 23
- 238000004210 cathodic protection Methods 0.000 claims description 13
- 238000007751 thermal spraying Methods 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 26
- 230000007797 corrosion Effects 0.000 abstract description 25
- 230000000694 effects Effects 0.000 abstract description 15
- 239000000126 substance Substances 0.000 abstract description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 19
- 239000010959 steel Substances 0.000 description 19
- 238000010586 diagram Methods 0.000 description 8
- 238000005507 spraying Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 239000011247 coating layer Substances 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Landscapes
- Finishing Walls (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
- Coating By Spraying Or Casting (AREA)
- Prevention Of Electric Corrosion (AREA)
- Building Environments (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明はコンクリート構造物もし
くは構造部材中の補強鋼材を防食するのに、これらコン
クリート表面に金属被覆物を溶射し、その被覆遮断効果
とともに被覆物を流電陽極として使用した防食性に優れ
た鉄筋コンクリート構造物、構造用部材及び鉄筋コンク
リートの電気防食方法に関する。[Industrial Application Field] The present invention aims to prevent corrosion of reinforcing steel materials in concrete structures or structural members by thermally spraying a metal coating onto the concrete surface, and using the coating as a galvanic anode in addition to its coating blocking effect. The present invention relates to a reinforced concrete structure with excellent corrosion resistance, a structural member, and a method for electrolytic corrosion protection of reinforced concrete.
【０００２】0002
【従来の技術およびその問題点】従来、コンクリート構
造物等の補強鋼材を防食するための各種方法、典型的に
は以下に示すような■〜■の方法が採用されている。■
コンクリート表面に無機系あるいは有機系高分子材料を
塗装、ライニング等の方法により塗布あるいは含浸させ
てコンクリート中の補強鋼材の腐食因子のコンクリート
中への浸透を遮断する：■補強鋼材にエポキシ樹脂粉体
塗装鋼材を用いる：■コンクリートの混錬時に防錆材を
混和剤として添加し、補強鋼材に強い酸化皮膜を形成す
る：■コンクリート表面あるいは内部にチタン・カーボ
ン等の導電性材料を配して導電性材料をアノードに、コ
ンクリート中の補強鋼材をカソードとなるように外部か
ら電場を付与し、一定微小電流がアノードからカソード
へ流れるように制御する：■コンクリート表面あるいは
内部に一定の大きさの亜鉛塊または板を配し、これらと
補強鋼材を導通させて亜鉛がアノード、補強鋼材がカソ
ードとなる電池を形成させる：等の手段である。[Prior Art and Problems] Hitherto, various methods have been employed to prevent corrosion of reinforcing steel materials such as concrete structures, typically methods (1) to (3) shown below. ■
Applying or impregnating an inorganic or organic polymeric material on the concrete surface by painting, lining, etc. to block the penetration of corrosive factors into the concrete by applying epoxy resin powder to the reinforcing steel. Using painted steel: ■ Adding anti-rust material as an admixture when mixing concrete to form a strong oxide film on the reinforcing steel: ■ Arranging conductive materials such as titanium or carbon on the surface or inside of the concrete to make it conductive. An electric field is applied from the outside, with the steel material in the concrete serving as the anode and the reinforcing steel material in the concrete serving as the cathode, and a constant minute current is controlled to flow from the anode to the cathode. This method involves arranging lumps or plates and connecting them to reinforcing steel to form a battery in which zinc serves as an anode and reinforcing steel serves as a cathode.
【０００３】しかしながら、■〜■の方法はいずれも以
下に示すような問題点を有するものである。■の方法は
腐食因子の遮断効果はあるが、鋼材の腐食速度をコント
ロールできず、施工前に鋼材が既に腐食している場合に
は、鋼材の長期的な防食効果について問題があり、また
表面処理材が外部から損傷を受けた場合や、劣化が起き
た場合にも長期的な防食効果が失われていまう。■の方
法は新設においては最も有効な方法であるが、既設構造
物においては腐食鋼材の一部あるいは全部をエポキシ樹
脂粉体塗装鉄筋に替えることは、異種の鋼材の接触によ
る電気的腐食あるいはコンクリート構造物の破壊をもた
らすために有効ではない。■の方法は防錆材のコンクリ
ート中への添加量が防食に要する量よりも少ないと、鉄
筋に孔食が発生する等、使用基準を十分に守らないとか
えって危険なことになる。■の方法は鋼材への防食効果
は十分あるものの、腐食因子の遮断効果は全くなく、施
工が煩雑であるうえに、外部電源を必要とし、そのため
の印加電流の制御、維持、点検等の管理が必要となって
面倒で、維持管理コストがかかる。■の方法は鋼板の防
食効果は十分あり、■の方法に比べて外部電源も必要な
いが、コンクリート構造物表面への被覆は全面になされ
ていないので、外界からの腐食因子のコンクリート内部
への侵入を阻止できず、遮断効果が不十分である。また
、新たに亜鉛板又は棒の形状、配置、導通のためのバッ
クフィルと称する手段が必要となり、施工は容易とはい
えず、コストがかかる。However, all of the methods (1) to (4) have the following problems. Method (2) has the effect of blocking corrosion factors, but it cannot control the corrosion rate of the steel material, and if the steel material is already corroded before construction, there is a problem with the long-term corrosion protection effect of the steel material, and the surface The long-term corrosion protection effect is also lost if the treated material is damaged from the outside or if it deteriorates. Method (2) is the most effective method for new construction, but in existing structures, replacing some or all of the corroded steel with epoxy resin powder-coated reinforcing bars may cause electrical corrosion due to contact between different types of steel, or Not effective in causing destruction of structures. In method (2), if the amount of rust preventive material added to the concrete is less than the amount required for corrosion prevention, pitting corrosion may occur in the reinforcing bars, which can be dangerous if the usage standards are not fully observed. Method (2) has a sufficient corrosion protection effect on steel materials, but it has no effect on blocking corrosion factors at all, is complicated to install, and requires an external power source, which requires management of applied current control, maintenance, inspection, etc. This is troublesome and requires high maintenance and management costs. Method (2) has sufficient corrosion protection effect on steel plates and does not require an external power supply compared to method (2), but since the surface of the concrete structure is not completely coated, corrosion factors from the outside cannot penetrate inside the concrete. The intrusion cannot be prevented and the blocking effect is insufficient. In addition, a new shape and arrangement of zinc plates or rods and means called backfill for electrical conduction are required, which is not easy to construct and is costly.
【０００４】一方、従来コンクリート表面に金属被覆物
を溶射により形成し、コンクリート表面を被覆して被覆
効果を付与するとともに美観を向上させることは、例え
ば特願平１−３１１６７４号公報に示され、公知である
。On the other hand, it has been shown in Japanese Patent Application No. 1-311674, for example, that a metal coating is conventionally formed on the concrete surface by thermal spraying to coat the concrete surface to provide a coating effect and to improve the aesthetic appearance. It is publicly known.
【０００５】本発明はコンクリート表面に溶射により形
成した金属被覆物により、コンクリート表面の被覆効果
とともに優れた防食効果をも併せ持った鉄筋コンクリー
ト構造物、構造用部材、及び鉄筋コンクリートの防食方
法を提供することを目的とするものである。[0005] The present invention aims to provide a reinforced concrete structure, a structural member, and a method for preventing corrosion of reinforced concrete, which has both a coating effect on the concrete surface and an excellent anticorrosion effect using a metal coating formed on the concrete surface by thermal spraying. This is the purpose.
【０００６】[0006]
【問題点を解決するための手段】本発明の鉄筋コンクリ
ートの電気防食方法は、コンクリート構造物もしくは構
造用部材の表面に、自然電位が鉄より卑な金属もしくは
合金からなる金属被覆物を溶射し、この金属被覆物と前
記構造物もしくは構造部材の補強鋼材とを電気的に接続
することからなる。また、本発明の鉄筋コンクリート構
造物もしくは鉄筋コンクリート構造用部材は、コンクリ
ート構造物もしくは構造用部材の表面に溶射により被覆
形成され、補強鋼材と電気的に導通された金属被覆物を
有してなるものである。[Means for Solving the Problems] The method for cathodic protection of reinforced concrete of the present invention includes thermally spraying a metal coating made of a metal or alloy whose natural potential is baser than iron on the surface of a concrete structure or structural member; It consists of electrically connecting this metal coating and the reinforcing steel material of the structure or structural member. Further, the reinforced concrete structure or reinforced concrete structural member of the present invention has a metal coating formed on the surface of the concrete structure or structural member by thermal spraying and electrically connected to the reinforcing steel material. be.
【０００７】このような本発明は新設あるいは既設を問
わず、鋼材で補強されたコンクリート構造物、構造用部
材として適用でき、特に既設のコンクリート構造物にも
その補修用として簡単に施工することができる。[0007] The present invention can be applied to concrete structures and structural members reinforced with steel materials, regardless of whether they are new or existing.In particular, the present invention can be easily applied to existing concrete structures for repair purposes. can.
【０００８】図１及び図２はそれぞれ鋼材で補強された
コンクリート構造物の電気防食概略図及びコンクリート
中の鋼材の接触方法の概略図である。本発明において、
コンクリート構造物あるいはコンクリート構造用部材の
コンクリート表面１に溶射により形成した金属被覆物２
と補強鋼材３とを電気的に導通させる必要がある。その
ため、コンクリート中の補強鋼材には溶射面との電気的
接触が取れるように−端子を取り付ける。各鋼材に取り
付けられた−端子４を図１に示すような溶射面に取り付
けたターミナル５の陽極リード線６端子＋に順次接続す
る。接続個数は金属溶射皮膜厚、鋼材量、防食面積によ
り異なるが、概ね２ｍ２につき１ヶ所程度とする。これ
らターミナル５及びリード線６は溶射される金属被覆物
２と同種の金属あるいは合金又は同様な自然電極電位を
有する金属及び合金製あるいはこれらの金属被覆物を施
した導通性材料で形成する。ターミナル５は新設コンク
リート構造物及びコンクリート構造用部材においては、
ステンレスアンカーをコンクリート打設前に型枠中に埋
め込んでおいてコンクリートを打設し、硬化型枠脱型後
にアンカー部と溶射面との導通をとるものとする。既設
コンクリート構造物においては、ケミカルアンカー又は
充填材７を用いたアンカーボルトによりコンクリート構
造物及びコンクリート構造用部材に固定する。充填材と
しては、セメント系無機質材料や高分子添加無機材料等
の一般的に充填材と称されるものである。ターミナルへ
のリード線の固定はワッシャーと接続用ナットを用いて
導通をとるものとする。これに用いるワッシャー、接続
用ナット９、アンカーボルト８は耐食性の良好な鋼材か
ら作製された例えばステンレス鋼よりなるものを用いる
ことができる。FIGS. 1 and 2 are respectively a schematic diagram of cathodic protection of a concrete structure reinforced with steel materials and a schematic diagram of a method of contacting steel materials in concrete. In the present invention,
Metal coating 2 formed by thermal spraying on the concrete surface 1 of a concrete structure or concrete structural member
It is necessary to electrically conduct the reinforcing steel material 3 with the reinforcing steel material 3. Therefore, a negative terminal is attached to the reinforcing steel in the concrete so that it can make electrical contact with the sprayed surface. The negative terminal 4 attached to each steel member is sequentially connected to the anode lead wire 6 terminal + of the terminal 5 attached to the sprayed surface as shown in FIG. The number of connections will vary depending on the thickness of the metal spray coating, the amount of steel material, and the area to be protected from corrosion, but it should be approximately one connection per 2m2. These terminals 5 and lead wires 6 are made of the same kind of metal or alloy as the metal coating 2 to be thermally sprayed, a metal or alloy having a similar natural electrode potential, or a conductive material coated with these metals. Regarding new concrete structures and concrete structural members, Terminal 5
Stainless steel anchors shall be embedded in the formwork before concrete pouring, concrete will be poured, and after the hardening formwork is removed, electrical continuity will be established between the anchor portion and the sprayed surface. In existing concrete structures, it is fixed to the concrete structure and concrete structural members using chemical anchors or anchor bolts using filler 7. The filler is generally referred to as a filler, such as a cement-based inorganic material or a polymer-added inorganic material. When fixing the lead wire to the terminal, use a washer and a connecting nut to ensure continuity. The washers, connection nuts 9, and anchor bolts 8 used here may be made of a steel material with good corrosion resistance, such as stainless steel.
【０００９】コンクリート構造物あるいはコンクリート
構造用部材のコンクリート表面１に金属被覆物を溶射す
る場合、溶射に先だってコンクリート表面にブラスト処
理を施し、金属被覆物とコンクリート表面との密着強度
を高めるようにすることが好ましい。金属被覆物２は溶
射されるコンクリート構造物あるいは構造用部材の耐用
年数を想定して溶射厚を決める。被覆層の消耗量は対象
とするコンクリート構造物の置かれている環境条件、特
にコンクリート中の鋼材の腐食性環境の程度により異な
るが、一般的には０．５〜１．０ｇ／Ａ／ｍ２／年と考
えてよい。溶射される金属は補強鋼材よりも電気化学的
に卑な金属、例えば亜鉛、アルミニウム等あるいはその
合金等、通常流電陽極として使用されている金属又はそ
の合金がそのまま適用できる。When thermally spraying a metal coating onto the concrete surface 1 of a concrete structure or concrete structural member, the concrete surface is blasted prior to thermal spraying to increase the adhesion strength between the metal coating and the concrete surface. It is preferable. The spraying thickness of the metal coating 2 is determined by assuming the service life of the concrete structure or structural member to be sprayed. The amount of wear of the coating layer varies depending on the environmental conditions of the target concrete structure, especially the degree of corrosive environment of the steel in the concrete, but in general it is 0.5 to 1.0 g/A/m2. / year. The metal to be thermally sprayed may be a metal that is electrochemically more base than the reinforcing steel, such as zinc, aluminum, or an alloy thereof, which is normally used as a galvanic anode.
【００１０】コンクリート表面に溶射された被覆物は初
期において、溶射金属がコンクリートと金属被覆物との
界面にて腐食生成物が生成するので抵抗が大きくなり、
カソード防食電流量が安定するまでの間、被覆物の消耗
量が多くなるが、長期的には問題ない。また、これらの
防食効果を確認するため、各鋼材端子とターミナル部の
＋端子との電気的接続を切って微小電流量を測定したり
、予めコンクリート中に埋設した照合電極と各鋼材端子
とを接続して電位の測定を行ったりすることができる。
ここで、金属被覆物を設けて被覆効果と電気防食とを併
用した場合、金属被覆物の被覆効果のみの場合、金属被
覆物を設けなかった場合とについて、補強鋼材の電位を
測定したところ、表１に示すような結果が得られた。[0010] Initially, the coating sprayed onto the concrete surface has a high resistance due to corrosion products generated by the sprayed metal at the interface between the concrete and the metal coating.
Until the amount of cathodic protection current stabilizes, the amount of wear on the coating will increase, but there will be no problem in the long run. In addition, in order to confirm these anti-corrosion effects, we cut the electrical connection between each steel terminal and the + terminal of the terminal section and measured the amount of minute current, and connected each steel terminal to a reference electrode buried in concrete in advance. It can be connected to measure potential. Here, the potential of the reinforcing steel material was measured when a metal coating was provided to provide a coating effect and cathodic protection, when only the coating effect of the metal coating was used, and when no metal coating was provided. The results shown in Table 1 were obtained.
【００１１】[0011]
【表１】[Table 1]
【００１２】なお、金属溶射による金属被覆物層は引っ
張り、剪断力に弱く、従ってコンクリート構造物の梁、
桁等のように曲げ、剪断力が負荷されるような部位、あ
るいは梁、桁等に使用されるコンクリート構造用部材に
あっては、ひび割れが発生し、電気防食方法による防食
効果あるいは美観上に問題が生じる。そのため、特に上
記のような部位の金属被覆物層は図４に示すように、構
造物、部材の長手方向を長さｌの数スパンのブロックに
分離して金属を溶射するするようにすることが好ましい
。この場合、ブロック間隙には溶射金属と同一のプレー
トをアンカーボルトで固定するようにする。[0012] Note that the metal coating layer formed by metal spraying is weak against tensile and shearing forces, so it cannot be used as a beam for concrete structures.
Cracks occur in parts such as girders where bending and shearing forces are applied, or in concrete structural members used for beams and girders, which may affect the corrosion protection effect or aesthetics of cathodic protection methods. A problem arises. Therefore, especially for the metal coating layer of the above-mentioned parts, as shown in Fig. 4, the structure or member should be separated in the longitudinal direction into blocks of several spans each having a length l, and the metal should be thermally sprayed. is preferred. In this case, the same plate as the sprayed metal is fixed in the block gap with anchor bolts.
【００１３】本発明を橋梁等の曲げ部材の電気防食を行
う場合には、図５に示すように、コンクリート部材中の
鉄筋と接続したリード線を橋台あるいは橋脚１０等の曲
げを生じないコンクリート部材に溶射された金属被覆物
層２のターミナル５と接続して電気防食を行う。When applying the present invention to cathodic protection of bending members such as bridges, as shown in FIG. The terminal 5 of the metal coating layer 2 is thermally sprayed on the terminal 5 to provide cathodic protection.
【００１４】[0014]
【実施例】表２に示す配合のコンクリート、Ｄ１３とＤ
６の鉄筋を用い、図６に示す４００×４００×１００の
供試体を作製し、比較例１として表面施工なし、比較例
２として厚さ１００〜２００μｍのエポキシ樹脂塗装を
施したもの、比較例３としてＺｎ，Ｚｎ−Ａｌ，Ａｌを
それぞれ２００μｍ溶射しただけのもの、比較例４とし
てカーボンメッシュによる外部電源によって電気防食を
行ったもの、実施例として、Ｚｎ，Ｚｎ−５Ａｌ，Ａｌ
，Ｍｇ，Ａｌ−５Ｍｇを５０〜２００μｍ溶射し、さら
にこの金属被覆物層を鉄筋と導通させて電気防食を行っ
たものを腐食促進試験機を用いて、塩水ふん霧（３％Ｎ
ａＣｌ，４０℃、３日間）、乾燥（５０℃、４日間）を
１サイクルとする腐食促進試験を６０サイクル実施し、
鉄筋の腐食状況、コンクリートの劣化状況を調べた。な
お、図６において、１１は電極プレート、１２は埋込型
電極である。その結果を表３に示す。なお、上記１０サ
イクルは約１０年の腐食期間に相当する。[Example] Concrete with the composition shown in Table 2, D13 and D
A 400 x 400 x 100 specimen as shown in Fig. 6 was prepared using No. 6 reinforcing bars, and Comparative Example 1 had no surface coating, Comparative Example 2 had epoxy resin coating with a thickness of 100 to 200 μm, and Comparative Example 3, Zn, Zn-Al, and Al were simply thermally sprayed to a thickness of 200 μm each; Comparative Example 4, which was subjected to cathodic protection using an external power source using carbon mesh; and Examples, Zn, Zn-5Al, and Al.
, Mg, Al-5Mg to a thickness of 50 to 200 μm, and this metal coating layer was electrically connected to the reinforcing steel to provide cathodic protection.
A corrosion acceleration test was conducted for 60 cycles, with one cycle consisting of aCl, 40°C, 3 days) and drying (50°C, 4 days).
We investigated the corrosion status of reinforcing bars and the deterioration status of concrete. In addition, in FIG. 6, 11 is an electrode plate and 12 is a buried electrode. The results are shown in Table 3. Note that the above 10 cycles correspond to a corrosion period of about 10 years.
【００１５】[0015]
【表２】[Table 2]
【００１６】[0016]
【表３】[Table 3]
【００１７】[0017]
【発明の効果】以上のような本発明によれば、コンクリ
ート表面に溶射されて形成された金属被覆物が被覆遮断
効果を有するとともに、電気防食の流電陽極としても作
用し、両者が相乗効果を発揮して従来見られない極めて
効果的な補強鋼材の防食が達成できる。しかも、従来の
ような外部電源、動力等を必要とせず、コンクリート防
錆コストが大幅に減少する。また、新設のコンクリート
構造物のみならず、既設のコンクリート構造物の補修施
工、あるいは現地施工等にも容易に且つ安価に適用でき
、被覆物が溶射により形成されるため、複雑表面形状の
コンクリート構造物あるいは構造用部材にも容易に適用
でき、その著しい防食効果と相俟って極めて有用なもの
といえる。According to the present invention as described above, the metal coating formed by thermal spraying on the concrete surface has a coating blocking effect and also acts as a galvanic anode for cathodic protection, and both have a synergistic effect. This makes it possible to achieve extremely effective corrosion protection of reinforced steel materials that has never been seen before. Moreover, it does not require an external power source, power, etc. as in the past, and the cost of preventing concrete from rusting is significantly reduced. In addition, it can be easily and inexpensively applied not only to new concrete structures, but also to repair work on existing concrete structures or on-site construction, and because the coating is formed by thermal spraying, it can be applied to concrete structures with complex surface shapes. It can be easily applied to objects or structural members, and combined with its remarkable anticorrosion effect, it can be said to be extremely useful.
【図１】本発明における電気防食概略説明図である。FIG. 1 is a schematic explanatory diagram of cathodic protection in the present invention.
【図２】コンクリート中の補強鋼材との接触方法の概略
説明図である。FIG. 2 is a schematic explanatory diagram of a method of contacting reinforcing steel in concrete.
【図３】リード線と部材との固定方法を示す説明図であ
る。FIG. 3 is an explanatory diagram showing a method of fixing a lead wire and a member.
【図４】梁、桁等の曲げひび割れ等が発生する部分の溶
射方法を示す説明図である。FIG. 4 is an explanatory diagram showing a thermal spraying method for parts such as beams and girders where bending cracks occur.
【図５】梁、桁等の曲げひび割れが発生する部分の電気
防食方法を示す説明図である。FIG. 5 is an explanatory diagram showing a method for cathodic protection of parts such as beams and girders where bending cracks occur.
【図６】実施例に用いた供試体の形状を示す説明図であ
る。FIG. 6 is an explanatory diagram showing the shape of a specimen used in an example.
１ コンクリート面 ２ 金属被覆物 ３ 補強鋼材 ４ −端子 ５ ターミナル ６ リード線 ７ 充填材 ８ アンカーボルト ９ ナット １０ 橋脚 １１ 電極プレート １２ 埋込型電極 1 Concrete surface 2 Metal coating 3 Reinforcement steel material 4 - terminal 5 Terminal 6 Lead wire 7 Filling material 8 Anchor bolt 9 Nut 10 Pier 11 Electrode plate 12 Embedded electrode
Claims (3)
材の表面に、自然電位が鉄より卑な金属もしくは合金か
らなる金属被覆物を溶射し、この金属被覆物と前記構造
物もしくは構造部材の補強鋼材とを電気的に接続する鉄
筋コンクリートの電気防食方法。Claim 1: A metal coating made of a metal or alloy whose natural potential is more base than iron is thermally sprayed onto the surface of a concrete structure or structural member, and the metal coating and the reinforcing steel of the structure or structural member are bonded together. Cathodic protection method for reinforced concrete with electrical connections.
材の表面に溶射により被覆形成され、補強鋼材と電気的
に導通された金属被覆物を有してなる鉄筋コンクリート
構造物。2. A reinforced concrete structure comprising a metal coating formed on the surface of a concrete structure or a structural member by thermal spraying and electrically connected to a reinforcing steel material.
材の表面に溶射により被覆形成され、補強鋼材と電気的
に導通された金属被覆物を有してなる鉄筋コンクリート
構造用部材。3. A reinforced concrete structural member comprising a metal coating formed on the surface of a concrete structure or structural member by thermal spraying and electrically connected to a reinforcing steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3084557A JPH04297643A (en) | 1991-03-26 | 1991-03-26 | Reinforced concrete structure and structural member, and electric protection method for reinforced concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3084557A JPH04297643A (en) | 1991-03-26 | 1991-03-26 | Reinforced concrete structure and structural member, and electric protection method for reinforced concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04297643A true JPH04297643A (en) | 1992-10-21 |
Family
ID=13833948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3084557A Pending JPH04297643A (en) | 1991-03-26 | 1991-03-26 | Reinforced concrete structure and structural member, and electric protection method for reinforced concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04297643A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU702822B2 (en) * | 1994-02-15 | 1999-03-04 | Eltech Systems Corporation | Reinforced concrete structure |
| US6673309B1 (en) | 1994-02-16 | 2004-01-06 | Corrpro Companies, Inc. | Sacrificial anode for cathodic protection and alloy therefor |
| JP2008144203A (en) * | 2006-12-07 | 2008-06-26 | Denki Kagaku Kogyo Kk | Construction method for preventing corrosion of concrete, and concrete structure made with the same |
| JP2009179876A (en) * | 2008-02-01 | 2009-08-13 | Ps Mitsubishi Construction Co Ltd | Method for cathodically protecting end of existing pc girder |
| JP2017014567A (en) * | 2015-06-30 | 2017-01-19 | 西日本高速道路株式会社 | Monitoring method for sacrificial anode construction method in concrete structure |
| WO2019082425A1 (en) * | 2017-10-24 | 2019-05-02 | タツタ電線株式会社 | Electric wire joining structure, electric wire joining method, and terminal |
-
1991
- 1991-03-26 JP JP3084557A patent/JPH04297643A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU702822B2 (en) * | 1994-02-15 | 1999-03-04 | Eltech Systems Corporation | Reinforced concrete structure |
| US6673309B1 (en) | 1994-02-16 | 2004-01-06 | Corrpro Companies, Inc. | Sacrificial anode for cathodic protection and alloy therefor |
| JP2008144203A (en) * | 2006-12-07 | 2008-06-26 | Denki Kagaku Kogyo Kk | Construction method for preventing corrosion of concrete, and concrete structure made with the same |
| JP4641025B2 (en) * | 2006-12-07 | 2011-03-02 | 電気化学工業株式会社 | Concrete anticorrosion method and concrete structure obtained by implementing the same |
| JP2009179876A (en) * | 2008-02-01 | 2009-08-13 | Ps Mitsubishi Construction Co Ltd | Method for cathodically protecting end of existing pc girder |
| JP2017014567A (en) * | 2015-06-30 | 2017-01-19 | 西日本高速道路株式会社 | Monitoring method for sacrificial anode construction method in concrete structure |
| WO2019082425A1 (en) * | 2017-10-24 | 2019-05-02 | タツタ電線株式会社 | Electric wire joining structure, electric wire joining method, and terminal |
| JP2019079687A (en) * | 2017-10-24 | 2019-05-23 | タツタ電線株式会社 | Electric wire junction structure, electric wire junction method, and terminal |
| US11862918B2 (en) | 2017-10-24 | 2024-01-02 | Tatsuta Electric Wire & Cable Co., Ltd. | Electric wire joining structure, electric wire joining method, and terminal |
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