JP2008128734A - Corrosion detection element of steel material in concrete - Google Patents

Corrosion detection element of steel material in concrete Download PDF

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JP2008128734A
JP2008128734A JP2006311924A JP2006311924A JP2008128734A JP 2008128734 A JP2008128734 A JP 2008128734A JP 2006311924 A JP2006311924 A JP 2006311924A JP 2006311924 A JP2006311924 A JP 2006311924A JP 2008128734 A JP2008128734 A JP 2008128734A
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concrete
steel
corrosion
sensor wiring
protective film
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Kiyoshi Mori
喜代志 森
Takao Kawahira
孝雄 川平
Shinji Kawakura
慎司 川倉
Kiichi Doi
喜一 土井
Toshiharu Matsuoka
俊治 松岡
Eizaburo Tachibana
英三郎 橘
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Tateyama Kagaku Kogyo Co Ltd
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Tateyama Kagaku Kogyo Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a corrosion detection element of a steel material in concrete capable of accurately judging the corrosion of the steel material in concrete by a simple concentration. <P>SOLUTION: The corrosion detection element of the steel material in concrete includes the sensor wiring 26 made of a metal arranged on an insulating substrate 20, electrodes 24 and 28 which keeps the sensor wiring 26 connected and are connected to external wiring, and a protective film 38 having the same composition as the protective film on the surface of the steel material in concrete 12 to cover the sensor wiring 26. The protective film 38 is a passivation film (FeOOH) formed so as to be placed under an environment where a strong oxidizing agent is present or a strong alkali environment. The protective film 38 on the sensor wiring 26 is embedded in concrete 12 so as to be exposed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、コンクリート構造物中の鉄筋や鉄骨等の鋼材の腐食状態を検知するコンクリート中鋼材の腐食検知素子に関する。   The present invention relates to a corrosion detection element for steel in concrete, which detects the corrosion state of steel such as reinforcing bars and steel frames in a concrete structure.

通常、コンクリート中の鉄筋は、コンクリート中の水酸化カルシウムと若干の水酸化ナトリウム、水酸化カリウムを含む強アルカリ環境下にあり、鉄筋の表面は水酸化鉄から成る薄い酸化皮膜の不動態膜で覆われ安定している。しかし、大気中の炭酸ガスやその他の酸性物質がコンクリートに作用し、長年の間にコンクリート中のアルカリ性は失われ中性化してしまう。この状態のコンクリート中では、元々存在していた塩化物イオン（Ｃｌ−）や外部から侵入する塩化物イオンにより、鋼材表面の不動態皮膜が破壊され、鋼材が活性態に変化し、徐々に腐食が始まる。特に近年、除塩処理が不十分な海産骨材を使用したり、潮風によって運ばれる海塩粒子が雨水に溶解してコンクリート中に浸透蓄積し、予想よりも早くコンクリート中の鋼材が腐食するケースが多数報告されている。 Normally, the reinforcing bars in concrete are in a strong alkaline environment containing calcium hydroxide and some sodium hydroxide and potassium hydroxide in the concrete, and the surface of the reinforcing bars is a thin oxide passivation film made of iron hydroxide. Covered and stable. However, carbon dioxide and other acidic substances in the atmosphere act on the concrete, and the alkalinity in the concrete is lost and neutralized over the years. In concrete in this state, the chloride film (Cl − ) that originally existed and chloride ions entering from the outside destroy the passive film on the surface of the steel material, and the steel material changes to an active state and gradually corrodes. Begins. In particular, in recent years, marine aggregates that have not been sufficiently desalted are used, or sea salt particles carried by sea breeze dissolve in rainwater and permeate and accumulate in concrete, causing steel materials in concrete to corrode faster than expected. Many have been reported.

この腐食の態様である鉄のいわゆる赤錆（Ｆｅ２Ｏ３）層は多孔質であるため、鉄表面に赤錆層が形成されても、腐食を抑制する効果が小さく、下地の鉄面では腐食が絶えず進行する。また、赤錆は鉄の約２．５倍の体積を占めるため、その膨張圧がコンクリートのひび割れと剥離を引き起こし、これらが腐食の進行を一層加速し、ついにはコンクリート構造物の強度の低下という重大な問題を引き起こす。従って、コンクリート中の鋼材の腐食状況を正確に検知する方法が要求されている。 Since the so-called red rust (Fe 2 O 3 ) layer of iron, which is an aspect of this corrosion, is porous, even if a red rust layer is formed on the iron surface, the effect of suppressing corrosion is small, and corrosion is not possible on the underlying iron surface. Progress constantly. In addition, red rust occupies about 2.5 times the volume of iron, so its expansion pressure causes cracking and peeling of the concrete, which further accelerates the progress of corrosion and eventually reduces the strength of the concrete structure. Cause serious problems. Therefore, a method for accurately detecting the corrosion status of steel in concrete is required.

従来、コンクリート中鋼材の腐食検知素子としては、例えば特許文献１に開示されているように、コンクリート中に鋼材と同質材料の細線を埋設し、この細線の両端の電位差を測定して、腐食による断線を検知しコンクリート中の鋼材の腐食状態を予測する方法が提案されている。また、特許文献２に開示されているように、細線状の貴金属被覆チタンワイヤを鉄筋に接続し、このワイヤと鉄筋との電位を測定してコンクリート中の鉄筋等の劣化を検出する方法も提案されている。その他、特許文献３に開示されているように、一端がコンクリート中の鉄筋に接続され、電気信号により振動するセンサ素子が鉄筋電極と鉄筋との間に挟持され、センサ素子の振動で鉄筋電極が鉄筋に接続され、鉄筋電極とコンクリート表面の照合電極の間で電圧を測定して、鉄筋の腐食程度を判定するものもある。
特許第３２０５２９１号公報 特許第３３９７７２２号公報 特開２００３−２６２６３１号公報 Conventionally, as a corrosion detecting element for steel in concrete, for example, as disclosed in Patent Document 1, a thin wire made of the same material as steel is embedded in concrete, and the potential difference between both ends of this thin wire is measured. A method for detecting disconnection and predicting the corrosion state of steel in concrete has been proposed. In addition, as disclosed in Patent Document 2, a method is also proposed in which a thin noble metal-coated titanium wire is connected to a reinforcing bar and the potential between the wire and the reinforcing bar is measured to detect deterioration of the reinforcing bar in the concrete. Has been. In addition, as disclosed in Patent Document 3, one end is connected to a reinforcing bar in concrete, a sensor element that vibrates by an electric signal is sandwiched between the reinforcing bar electrode and the reinforcing bar, and the reinforcing bar electrode is caused by vibration of the sensor element. Some are connected to a rebar and measure the voltage between the rebar electrode and the reference electrode on the concrete surface to determine the degree of corrosion of the rebar.
Japanese Patent No. 3205291 Japanese Patent No. 3397722 Japanese Patent Laid-Open No. 2003-262631

しかしながら、前記特許文献１の腐食検知装置の場合、鋼材と同質材料の細線の腐食による断線または電位変化を検知するものであり、細線の酸化進行度合いにばらつきが大きく、正確な予測が難しいものである。さらに、コンクリート工事施工時に細線を切断してしまうなど、センサとしての信頼性に欠ける等の欠点もある。また、特許文献２、３の場合も、電極間の電位から鉄筋の状態を予測するものであり、ばらつきの幅が大きいものである。   However, in the case of the corrosion detection apparatus of Patent Document 1, a wire breakage or a potential change due to corrosion of a thin wire of the same material as the steel material is detected. is there. Furthermore, there are also disadvantages such as lack of reliability as a sensor, such as cutting fine wires during construction of concrete. In the case of Patent Documents 2 and 3, the state of the reinforcing bar is predicted from the potential between the electrodes, and the width of variation is large.

この発明は、上記従来の技術に鑑みて成されたもので、簡単な構成で、正確にコンクリート中の鋼材の腐食を判断することができるコンクリート中鋼材の腐食検知素子を提供することを目的とする。   The present invention has been made in view of the above prior art, and has an object to provide a corrosion detecting element for steel in concrete, which can accurately determine the corrosion of steel in concrete with a simple configuration. To do.

この発明は、コンクリート中に埋設して、コンクリート中の鋼材の腐食を検知する腐食検知素子であって、絶縁基板上に配線された金属製のセンサ配線と、このセンサ配線が接続されているとともに外部の配線につながれた電極と、前記コンクリート中の鋼材表面の保護皮膜と同様の組成で前記センサ配線を被覆した保護皮膜とを備え、前記センサ配線上の保護皮膜を前記コンクリート中に露出させて埋設するコンクリート中鋼材の腐食検知素子である。   The present invention relates to a corrosion detecting element that is embedded in concrete and detects the corrosion of steel in the concrete, and the sensor wiring made of metal wired on an insulating substrate is connected to the sensor wiring. An electrode connected to an external wiring; and a protective film covering the sensor wiring with the same composition as the protective film on the surface of the steel material in the concrete, and exposing the protective film on the sensor wiring to the concrete. It is a corrosion detection element for steel in concrete to be buried.

前記保護皮膜は、鉄または鋼の薄膜を強酸化剤の存在する環境や強アルカリ環境下において形成した水酸化鉄から成る不動態膜（ＦｅＯＯＨ）、またはこの不動態膜と同様の防錆防蝕機能を有する薄膜である。前記絶縁基板は、開口部を有したセラミックや硬質樹脂、その他硬質材料のケース中に密封され、前記ケースに形成された開口部に、前記センサ配線を被覆した保護皮膜が露出して成る。   The protective film is a passive film (FeOOH) made of iron hydroxide formed of an iron or steel thin film in the presence of a strong oxidizing agent or in a strong alkaline environment, or the same rust and corrosion prevention function as this passive film. Is a thin film. The insulating substrate is sealed in a case of ceramic, hard resin, or other hard material having an opening, and a protective film covering the sensor wiring is exposed in the opening formed in the case.

この発明のコンクリート中鋼材の腐食検知素子は、鋼材と同一組成または同程度の強度や耐久性を備えた金属薄膜回路と、鋼材表面を被覆して保護している皮膜と同様の保護皮膜とにより、コンクリート中の腐食状態を検知するもので、鋼材と同様の条件で、正確に腐食またはその可能性を検知することができる。また、素子の構造も簡単であり、強度も高いので、コンクリート中に埋設して、長期間のモニタリングも可能である。また、コストも安価に製造可能であり、コンクリート構造物中に多数埋設して、正確な腐食予測及び検知が可能となる。   The corrosion detecting element for steel in concrete according to the present invention comprises a metal thin film circuit having the same composition as steel or having the same strength and durability, and a protective film similar to the film covering and protecting the steel surface. It detects the corrosion state in concrete, and can accurately detect corrosion or its possibility under the same conditions as steel materials. In addition, since the structure of the element is simple and the strength is high, it can be embedded in concrete for long-term monitoring. Moreover, it can be manufactured at low cost, and a large number of them can be embedded in a concrete structure to accurately predict and detect corrosion.

以下、この発明の実施の形態について説明する。この実施形態のコンクリート中鋼材の腐食検知素子１０は、図１に示すように、平板状のチップ型素子であって、コンクリート１２中に埋設して使用する。この腐食検知素子１０は、平板状セラミックスや硬質樹脂等の下ケース１４と、同様の厚さ及び大きさの上ケース１６に挟まれて構成されている。上ケース１６には、平面開口部１８が設けられ、下ケースと等しい大きさに形成されている。   Embodiments of the present invention will be described below. As shown in FIG. 1, the corrosion detection element 10 for a steel-in-concrete material of this embodiment is a flat chip-type element that is used by being embedded in concrete 12. The corrosion detection element 10 is configured to be sandwiched between a lower case 14 such as flat ceramics or hard resin, and an upper case 16 having the same thickness and size. The upper case 16 is provided with a planar opening 18 and is formed in the same size as the lower case.

下ケース１４の表面には、シリコン基板２０が取り付けられている。シリコン基板２０の表面には、図１に示すように、外側に四角形状に基準配線２２が形成され、両端部がシリコン基板２０の一端縁部に位置して各電極２４に各々接続されている。基準配線２２の材料は、銅や鉄または鋼、アルミニウム等適宜選択可能である。   A silicon substrate 20 is attached to the surface of the lower case 14. As shown in FIG. 1, a rectangular reference wiring 22 is formed on the surface of the silicon substrate 20 on the outer side, and both end portions are located at one end edge of the silicon substrate 20 and are connected to the respective electrodes 24. . The material of the reference wiring 22 can be appropriately selected from copper, iron, steel, aluminum and the like.

基準配線２２の中央部には、センサ配線２６がつながっている。センサ配線２６は、鋼材と同様の鋼、または銅や鉄等の金属薄膜による配線であり、基準配線２２と同材料の場合同時に形成すると良い。特に、コンクリート１２中の鋼材と同材料の鋼製の薄膜とすることにより、条件が鋼材と同様になりより好ましい。センサ配線２６の形状は、基準配線２２の中央部で１本につながった形状でシリコン基板２０の中央部では３本に分かれ、シリコン基板２０の一端縁部で１本にまとまり、２つの電極２８に分かれてセンサ配線２６の基端部と電極２８が接続している。これにより、センサ配線２６を挟んで、電極２４と電極２８が位置し、電極２４，２８は、各々同電位で一対ずつ設けられている。   A sensor wiring 26 is connected to the center of the reference wiring 22. The sensor wiring 26 is a wiring made of the same steel as the steel material, or a metal thin film such as copper or iron, and may be formed simultaneously when the same material as the reference wiring 22 is used. In particular, by using a steel thin film of the same material as the steel material in the concrete 12, the conditions are more preferable because they are similar to the steel material. The shape of the sensor wiring 26 is connected to one at the central portion of the reference wiring 22 and is divided into three at the central portion of the silicon substrate 20. The electrode 28 is connected to the base end portion of the sensor wiring 26. Thus, the electrode 24 and the electrode 28 are located across the sensor wiring 26, and a pair of the electrodes 24 and 28 are provided at the same potential.

センサ配線２６は、３本に分かれた部分が上ケース１６の開口部１８から露出し、コンクリート１２中に露出して埋設される。開口部１８の外側に位置した、センサ配線２６、基準配線２２、電極２４，２８、及びシリコン基板２０の表面部分は、上ケース１６により密閉状態で覆われている。また、電極２４，２８には、下ケース１４上に配線された接続配線３０に各々つながれ、下ケース１４の一端部に設けられたコネクタ３２の図示しない端子に接続されている。   The sensor wiring 26 is divided into three parts, exposed from the opening 18 of the upper case 16, and exposed and embedded in the concrete 12. The sensor wiring 26, the reference wiring 22, the electrodes 24 and 28, and the surface portions of the silicon substrate 20 located outside the opening 18 are covered with the upper case 16 in a sealed state. The electrodes 24 and 28 are connected to connection wirings 30 wired on the lower case 14, respectively, and are connected to terminals (not shown) of a connector 32 provided at one end of the lower case 14.

上ケース１６から露出したセンサ配線２６の表面には、コンクリート１２中の鋼材表面の不動態膜である保護皮膜と同様の保護皮膜３８により覆われている。保護皮膜３８は、鋼材表面の不動態膜（ＦｅＯＯＨ）である。この保護皮膜３８の形成は、シリコン基板２０表面に、真空蒸着やスパッタリング等により鉄または鋼の薄膜によるセンサ配線２６を形成した後、シリコン基板２０表面のセンサ配線２６を、強酸化剤の存在する環境や強アルカリ環境下において形成する。   The surface of the sensor wiring 26 exposed from the upper case 16 is covered with a protective film 38 similar to the protective film which is a passive film on the steel material surface in the concrete 12. The protective film 38 is a passive film (FeOOH) on the steel material surface. The protective film 38 is formed by forming a sensor wiring 26 made of an iron or steel thin film on the surface of the silicon substrate 20 by vacuum deposition, sputtering, or the like, and then presenting the sensor wiring 26 on the surface of the silicon substrate 20 with a strong oxidizing agent. It forms under the environment and strong alkaline environment.

コネクタ３２には、コンクリート１２内に配管された導管３４の一端がつながれ、コンクリート１２の表面のコネクタ３６に、導管３４の他端が接続されている。導管３４内には、コネクタ３２に接続された二対の各電極２４，２８に接続された図示しない配線が挿通されている。コンクリート１２表面のコネクタ３６には、図示しないコネクタにより、検知用の配線コネクタが接続され、測定装置３９を介してコンピュータ４０等により信号が送信されるとともに、測定データが解析される。   One end of a conduit 34 piped in the concrete 12 is connected to the connector 32, and the other end of the conduit 34 is connected to a connector 36 on the surface of the concrete 12. A wiring (not shown) connected to the two pairs of electrodes 24 and 28 connected to the connector 32 is inserted into the conduit 34. A detection wiring connector is connected to the connector 36 on the surface of the concrete 12 by a connector (not shown), and a signal is transmitted by the computer 40 or the like via the measuring device 39 and the measurement data is analyzed.

次に、この実施形態の腐食検知素子１０による、コンクリート中鋼材の腐食検知の原理について以下に説明する。   Next, the principle of the corrosion detection of the steel in the concrete by the corrosion detection element 10 of this embodiment will be described below.

コンクリート中の鉄筋や鉄骨等の鋼材は、上述のように強アルカリ性の環境で埋設されている。これは、建設時のコンクリートは以下のように、
Ｃａ（ＯＨ）２＝Ｃａ２＋＋２ＯＨ−
となり、コンクリート内で水酸基（ＯＨ−）が電離していることによる。しかし、コンクリートは外部から二酸化炭素（ＣＯ２）を吸収し、時間の経過とともにコンクリートの中は中性化が進行する。この反応は、以下の通りである。 Steel materials such as reinforcing bars and steel frames in concrete are embedded in a strong alkaline environment as described above. This is because the concrete during construction is as follows:
Ca (OH) 2 = Ca 2+ + 2OH −
This is because the hydroxyl group (OH − ) is ionized in the concrete. However, concrete absorbs carbon dioxide (CO 2 ) from the outside, and the neutralization of the concrete progresses with time. This reaction is as follows.

ＣＯ２＋Ｈ２Ｏ→Ｈ２ＣＯ３→２Ｈ＋＋ＣＯ３ ２−
この水素イオンＨ＋がコンクリート中の水酸基ＯＨ−と中和して、水（Ｈ２Ｏ）になる。この結果アルカリを示す水酸基（ＯＨ−）がどんどん減少し、コンクリートの中は徐々に中和していく。さらに、コンクリート中の塩化物イオン（Ｃｌ−）は、鋼材表面の不動態膜（ＦｅＯＯＨ）を破壊し、徐々に酸化による腐食が始まる。ここで生じる酸化鉄は赤錆が主体であり、条件によっては黒錆の発生もある。しかし、鉄または鋼と比較して黒錆の電気抵抗値はかなり大きく（１０３〜１０４Ω）、赤錆にいたってはほぼ絶縁物であると言える。 CO 2 + H 2 O → H 2 CO 3 → 2H + + CO 3 2−
This hydrogen ion H + is neutralized with the hydroxyl group OH − in the concrete to become water (H 2 O). As a result, the hydroxyl groups (OH − ) indicating alkali are decreasing and the concrete is gradually neutralized. Furthermore, chloride ions (Cl − ) in the concrete destroy the passive film (FeOOH) on the surface of the steel material and gradually start to corrode due to oxidation. The iron oxide produced here is mainly red rust, and black rust may be generated depending on the conditions. However, the electrical resistance value of black rust is considerably larger than that of iron or steel (10 3 to 10 4 Ω), and it can be said that red rust is almost an insulator.

そこで、この腐食検知素子１０においては、鉄または鋼のセンサ配線２６の表面に、不動態膜（ＦｅＯＯＨ）から成る保護被膜３８を形成した状態で、コンクリート１２中に腐食検知素子１０を埋設する。この後、コネクタ３６に測定装置３９を介してコンピュータ４０からの配線を接続し、センサ配線２６の状態を検知する。このとき、電極２４，２８に測定装置３９及びコンピュータ４０からの配線を接続する。対になった電極２４，２８が二対設けられているのは、腐食以外の要因による断線で、検知不能になることを防止するための安全策である。また、電極２４，２８間にかける電圧は、交流電圧を印加して、微小断線による容量の形成を検知する方が、直流電圧により単に断線を検知するよりも高精度に腐食を検知することができる。   Therefore, in this corrosion detection element 10, the corrosion detection element 10 is embedded in the concrete 12 with a protective film 38 made of a passive film (FeOOH) formed on the surface of the sensor wiring 26 made of iron or steel. Thereafter, the wiring from the computer 40 is connected to the connector 36 via the measuring device 39, and the state of the sensor wiring 26 is detected. At this time, wires from the measuring device 39 and the computer 40 are connected to the electrodes 24 and 28. The two pairs of electrodes 24 and 28 provided as a pair is a safety measure for preventing an undetectable state due to disconnection due to factors other than corrosion. In addition, as for the voltage applied between the electrodes 24 and 28, it is possible to detect corrosion with higher accuracy when an AC voltage is applied and the formation of a capacitance due to a minute disconnection is detected than when a disconnection is simply detected by a DC voltage. it can.

この腐食検知素子１０は、検知対象であるコンクリート中に埋設してコンクリート中の鋼材表面の保護皮膜と同様の保護皮膜３８をセンサ表面の開口部１８に露出させ、その下に鉄や鋼によるセンサ配線２６を配置し、保護皮膜３８が破られると、鉄等のセンサ配線２６が直接腐食され、抵抗値が変化しついには断線する。さらに、断線後も腐食の程度により、断線箇所の間隔が異なり、この隙間による静電容量が異なることから、交流電圧を電極２４，２８間に印加して検知することにより、腐食の程度を知ることができる。   The corrosion detecting element 10 is embedded in the concrete to be detected, exposes a protective film 38 similar to the protective film on the steel surface in the concrete to the opening 18 on the sensor surface, and underneath it is a sensor made of iron or steel. When the wiring 26 is disposed and the protective film 38 is broken, the sensor wiring 26 such as iron is directly corroded, and the resistance value is changed and finally disconnected. Further, even after the disconnection, the distance between the disconnection portions differs depending on the degree of corrosion, and the capacitance due to this gap differs. Therefore, the degree of corrosion is known by detecting by applying an AC voltage between the electrodes 24 and 28. be able to.

この実施形態の腐食検知素子１０の使用方法は、コンクリート１２の打設時に、適宜の箇所にこの腐食検知素子１０を固定し、コンクリート１２中に埋設する。埋設深さは、コンクリート中鋼材のコンクリートかぶり深さと同じ程度にする。また、コンクリート中鋼材のコンクリートかぶり深さより浅い位置に埋設して、表面側のコンクリート状態を検知しても良く、この腐食検知素子１０を深さ方向に複数用意し、コンクリート構造物中の鋼材のコンクリートかぶり深さよりも浅い位置から順次深い位置に埋設して、コンクリート状態の深さ方向の変化を検知するようにしても良い。   In the method of using the corrosion detecting element 10 of this embodiment, when the concrete 12 is placed, the corrosion detecting element 10 is fixed at an appropriate place and embedded in the concrete 12. The burial depth should be the same as the concrete cover depth of the steel in the concrete. Moreover, it may be embedded at a position shallower than the concrete cover depth of the steel in the concrete to detect the concrete state on the surface side. A plurality of corrosion detecting elements 10 are prepared in the depth direction, and the steel in the concrete structure It is also possible to embed in deeper positions sequentially from a position shallower than the concrete cover depth to detect a change in the depth direction of the concrete state.

この実施形態の腐食検知素子１０によれば、コンクリート１２中の鋼材と同様の保護皮膜３８をコンクリート１２中に露出させてコンクリート１２中に埋設させ、鋼材の保護皮膜３８の破壊を直接的に検知するのと同様の精度で、腐食を検知することができるものである。   According to the corrosion detecting element 10 of this embodiment, the protective film 38 similar to the steel material in the concrete 12 is exposed in the concrete 12 and embedded in the concrete 12, and the destruction of the protective film 38 of the steel material is directly detected. Corrosion can be detected with the same accuracy.

なお、この発明のコンクリート中鋼材の腐食検知素子は上記実施形態に限定されるものではなく、センサ配線は、鉄や鋼以外に銅やその他の金属でも良く、コンクリート中で腐食が進行可能なものであればよい。さらに基準配線の形状およびセンサ配線の形状も図示した形状にこだわる必要はなく、状況や用途に応じて適宜の形状を選択し得るものである。また、センサ配線等を形成する基板はシリコンに限定されるものではなく、ガラス等の絶縁物であれば良い。その他、鋼材とセンサ配線の保護皮膜は、水酸化鉄の保護皮膜以外に、薄い樹脂被膜でも良く、測定対象の鋼材の保護皮膜と同様の機能、耐久性を有した保護皮膜をセンサ配線に形成したものであれば良く、その形成方法や、保護皮膜の種類は適宜測定対象の鋼材に合わせて選択可能なものである。   The corrosion detection element for steel in concrete according to the present invention is not limited to the above embodiment, and the sensor wiring may be copper or other metals in addition to iron or steel, and the corrosion can proceed in concrete. If it is. Furthermore, the shape of the reference wiring and the shape of the sensor wiring need not be particular to the illustrated shape, and an appropriate shape can be selected according to the situation and application. Further, the substrate on which the sensor wiring or the like is formed is not limited to silicon, and may be an insulator such as glass. In addition to the protective film of iron hydroxide, the protective film of steel material and sensor wiring may be a thin resin film, and a protective film with the same function and durability as the protective film of the steel material to be measured is formed on the sensor wiring. The formation method and the type of the protective film can be appropriately selected according to the steel material to be measured.

この発明の一実施形態のコンクリート中鋼材の腐食検知素子の上ケース取り付け前の平面図である。It is a top view before the upper case attachment of the corrosion detection element of the steel in concrete material of one Embodiment of this invention. この発明の一実施形態のコンクリート中鋼材の腐食検知素子の図１に上ケースを取り付けた状態のＡ−Ａ断面図である。It is AA sectional drawing of the state which attached the upper case to FIG. 1 of the corrosion detection element of the steel in concrete material of one Embodiment of this invention. この発明の一実施例のコンクリート中鋼材の腐食検知素子の使用状態を示す概略図である。It is the schematic which shows the use condition of the corrosion detection element of the steel material in concrete of one Example of this invention.

符号の説明Explanation of symbols

１０ 腐食検知素子
１２ コンクリート
１４ 下ケース
１６ 上ケース
１８ 開口部
２０ シリコン基板
２２ 基準配線
２４，２８ 電極
２６ センサ配線
３８ 保護皮膜 DESCRIPTION OF SYMBOLS 10 Corrosion detection element 12 Concrete 14 Lower case 16 Upper case 18 Opening part 20 Silicon substrate 22 Reference | standard wiring 24 and 28 Electrode 26 Sensor wiring 38 Protective film

Claims (3)

コンクリート中に埋設して、コンクリート中の鋼材の腐食を検知する腐食検知素子において、絶縁基板上に配線された金属製のセンサ配線と、このセンサ配線が接続されているとともに外部の配線につながれた電極と、前記コンクリート中の鋼材表面の保護皮膜と同様の組成で前記センサ配線を被覆した保護皮膜とを備え、前記センサ配線上の保護皮膜を前記コンクリート中に露出させて埋設することを特徴とするコンクリート中鋼材の腐食検知素子。   In a corrosion detection element that is embedded in concrete and detects the corrosion of steel in concrete, the metal sensor wiring wired on the insulating substrate and the sensor wiring are connected and connected to the external wiring. An electrode and a protective coating covering the sensor wiring with the same composition as the protective coating on the surface of the steel material in the concrete, the protective coating on the sensor wiring being exposed and embedded in the concrete Corrosion detector for steel in concrete. 前記保護皮膜は、鉄または鋼の水酸化鉄から成る不動態膜、またはこの不動態膜と同様の機能を有する薄膜から成ることを特徴とする請求項１記載のコンクリート中鋼材の腐食検知素子。   2. The corrosion detecting element for steel in concrete according to claim 1, wherein the protective film is made of a passive film made of iron or steel iron hydroxide, or a thin film having the same function as the passive film. 前記絶縁基板は、開口部を有した硬質のケース中に密封され、前記ケースに形成された開口部に、前記センサ配線を被覆した保護皮膜が露出して成る請求項２記載のコンクリート中鋼材の腐食検知素子。

3. The steel in concrete material according to claim 2, wherein the insulating substrate is sealed in a hard case having an opening, and a protective film covering the sensor wiring is exposed in the opening formed in the case. Corrosion detector.

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