JPS61124863A - Method for measuring potential of reinforcing bar in concrete - Google Patents
Method for measuring potential of reinforcing bar in concreteInfo
- Publication number
- JPS61124863A JPS61124863A JP59244677A JP24467784A JPS61124863A JP S61124863 A JPS61124863 A JP S61124863A JP 59244677 A JP59244677 A JP 59244677A JP 24467784 A JP24467784 A JP 24467784A JP S61124863 A JPS61124863 A JP S61124863A
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- Prior art keywords
- potential
- concrete
- electrode
- reference electrode
- reinforcing bar
- Prior art date
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、鉄筋腐食監視のためコンクリート中の鉄筋電
位を測定する方法に関し、特にコンクリート中の鉄筋鋼
材その他の金属体の電位を長期間に亘り安定的に監視す
るのに適した測定方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for measuring reinforcing steel potential in concrete for monitoring reinforcing steel corrosion, and in particular to a method for stabilizing the potential of reinforcing steel and other metal bodies in concrete over a long period of time. This invention relates to a measurement method suitable for continuous monitoring.
従来の技術
鉄筋コンクリート構造物中の鋼材その他の金属（以下、
「鉄筋」という。）の電位を測定し監視することにより
、鉄筋腐食の有無を推定することが行われている。また
、鉄筋コンクリート構造物に電気防食を実施した場合に
も、防食効果を推定するため、鉄筋電位が測定される。Conventional technology Steel and other metals in reinforced concrete structures (hereinafter referred to as
It's called "rebar." ) The presence or absence of corrosion of reinforcing steel is estimated by measuring and monitoring the electric potential of steel. Furthermore, even when cathodic protection is applied to a reinforced concrete structure, the reinforcing steel potential is measured in order to estimate the corrosion protection effect.
第２図及び第３図を参照するに、コンクリートｌ中の鉄
筋２の電位を測定するには、コンクリート１の表面に照
合電極装置３を取付け、鉄筋２に固定された鉄筋端子４
と照合電極装置３の電線６を電圧計５に接続する。Referring to FIGS. 2 and 3, in order to measure the potential of the reinforcing bars 2 in the concrete 1, a reference electrode device 3 is attached to the surface of the concrete 1, and a reinforcing bar terminal 4 fixed to the reinforcing bars 2 is attached to the surface of the concrete 1.
and connect the electric wire 6 of the reference electrode device 3 to the voltmeter 5.
照合電極装置３は、金属電極７と充填剤８とを有し、鉄
筋２の電位を測定する場合、金属電極７は充填剤８を介
してコンクリート１と電気的に接続される。コンクリー
トｌ内の起電力Ｅｃは零である（ Ｅｃ＝Ｏ）とすれば
、第３図の図式的等価回路における電圧計５の読みＶは
１次式で与えられる。The reference electrode device 3 has a metal electrode 7 and a filler 8, and when measuring the potential of the reinforcing bar 2, the metal electrode 7 is electrically connected to the concrete 1 via the filler 8. Assuming that the electromotive force Ec in the concrete l is zero (Ec=O), the reading V of the voltmeter 5 in the schematic equivalent circuit of FIG. 3 is given by a linear equation.
ＶｇＥｉ＋Ｅｂ ＋計
−−−（１）ここに、Ｅｉは鉄筋２
の電位、Ｅｂはコンクリートｌと充填剤８との間の接触
電位差、 Ｅｒは照合電極装置３の出力である。照合電
極装置の固堝電位１Ｅ（−Ｅｂ÷εｒ）゛とおけば、鉄
筋２の電位Ｅｉは、電圧計５の読み■から次式により求
めるられる。VgEi + Eb + total
---(1) Here, Ei is reinforcing bar 2
, Eb is the contact potential difference between the concrete l and the filler 8, and Er is the output of the reference electrode device 3. If the fixed potential 1E (-Eb÷εr) of the reference electrode device is set, the potential Ei of the reinforcing bar 2 can be determined from the reading of the voltmeter 5 by the following equation.
Ｅｉ＝ Ｖ −Ｅ ・拳や （
２つ米国規格ＡＳＴＭ Ｃ８７Ｂ−７７によれば、電位
Ｅｉが測定されたその箇所での鉄筋の腐食状態は次の様
な状態にある。ただし、電位Ｅｉは、照合電極（Ｃ：Ｓ
Ｅ）に対する値であり、その単位はボルトである。Ei = V −E ・Fist or (
According to the American standard ASTM C87B-77, the corrosion state of the reinforcing steel at the point where the potential Ei is measured is as follows. However, the potential Ei is the reference electrode (C:S
E) in volts.
−０，２０＜Ｅｉ ９Ｈの確率で腐食が生じ
ていない。Corrosion does not occur with a probability of -0,20<Ei 9H.
−０，３５＜ Ｅｉ＜ −０，２０不確定Ｅｉ＜−０，
３５９０％の確率で腐食が生じている。-0,35<Ei<-0,20 Uncertain Ei<-0,
Corrosion has occurred with a probability of 3590%.
従来は、照合電極装置３として硫酸銅電極等が用いられ
てきた。これらの従来使用された照合電極３は、短期間
の監視には適するが、コンクリートｌに長期間接触させ
ておくと、コンクリートのアルカリ性雰囲気のため照合
電極３の出方である基準電位が変化し鉄筋２の電位Ｅｉ
を正確に与えなくなるので長期間の監視に適しない欠点
がある。Conventionally, a copper sulfate electrode or the like has been used as the reference electrode device 3. These conventionally used reference electrodes 3 are suitable for short-term monitoring, but if they are kept in contact with concrete for a long period of time, the reference potential at which the reference electrode 3 appears will change due to the alkaline atmosphere of the concrete. Potential Ei of reinforcing bar 2
It has the disadvantage that it is not suitable for long-term monitoring because it does not provide accurate information.
例えば、アルカリ性である飽和水酸化カルシウム水溶液
中に照合電極を１２０日間放置しその電位の経時変化を
測定した結果を示す第４図の場合、硫酸銅電極の電位は
０．３ボルト以上、飽和甘木電極の電位は０．０５ボル
ト以上変化する。アルカリ性雰囲気中におけるこれらの
照合電極電位の経時変化又はそれに近い変化が現実の鉄
筋電位測定において発生すると仮定すると、上記ＡＳＴ
Ｈの腐食状態の目安における鉄筋電位の臨界値が０．２
０〜０．３５ボルトであるから、上記照合電極電位の経
時変化は腐食の監視を極めて不安定にするものであると
考えられる。For example, in the case of Figure 4, which shows the results of leaving a reference electrode in an alkaline saturated calcium hydroxide aqueous solution for 120 days and measuring the change in potential over time, the potential of the copper sulfate electrode is 0.3 volts or more, and the saturated Amagi The potential of the electrodes varies by more than 0.05 volts. Assuming that these reference electrode potential changes over time in an alkaline atmosphere or similar changes occur in actual reinforcing steel potential measurement, the above AST
The critical value of reinforcing steel potential in the standard of H corrosion state is 0.2
0 to 0.35 volts, it is believed that the change in the reference electrode potential over time makes corrosion monitoring extremely unstable.
さらに、従来の照合電極による鉄筋電位の監視法には、
照合電極に薬液が含まれるため、その取付は向きが限定
され：′、シかも出力電位に変化が認められたときにも
その交換が不便である欠点が避けられなかった。Furthermore, conventional methods of monitoring reinforcing steel potential using reference electrodes include:
Since the reference electrode contains a chemical solution, its mounting direction is limited, and it is unavoidable that it is inconvenient to replace it even when a change in output potential is observed.
発明が解決しようとする問題点
従って、本発明が解決しようとする問題点は、コンクリ
ート中鉄筋の電位測定の安定化、及び照合電極の取付・
交換の容易化である。Problems to be Solved by the Invention Therefore, the problems to be solved by the present invention are to stabilize the potential measurement of reinforcing bars in concrete, and to install and install reference electrodes.
This facilitates exchange.
問題点を解決するための手段
上記問題点を解決するため、本発明者は、第４図に示さ
れる実験において鉛電極がアルカリ性雰囲気に対し極め
て安定である点、及びコンクリートのアルカリ性が水酸
化カルシウムに大きく依存する点に注目した。Means for Solving the Problems In order to solve the above problems, the present inventor conducted an experiment shown in FIG. We focused on the fact that it is highly dependent on
第３図を参照するに、本発明によるコンクリート中の鉄
筋電位測定法においては、コンクリートとの接触電位差
が低い水酸化カルシウムとセラコラ又はセメントモルタ
ルからなる固相充填剤８の中に金属鉛電極７を配置して
アルカリ環境用照合電極装置３を構成する。この照合電
極装置３の固相充填剤８をコンクリート１の表面に接触
させて照合電極装置３をコンクリート１に固定する。前
記コンクリート１中に埋設された鉄筋２及び前記照合電
極装置３の金属鉛電極７より電線６をもって電圧計５に
接続し、電圧計の読みＶと前記照合 □電極装置の固有
電位Ｅ（−計＋Ｅｂ）との差として前記鉄筋の電位Ｅ１
を測定する。Referring to FIG. 3, in the method for measuring reinforcing bar potential in concrete according to the present invention, a metal lead electrode 7 is placed in a solid phase filler 8 consisting of calcium hydroxide and Ceracola or cement mortar, which has a low contact potential difference with concrete. A reference electrode device 3 for an alkaline environment is constructed by arranging the reference electrode device 3 for use in an alkaline environment. The solid phase filler 8 of this reference electrode device 3 is brought into contact with the surface of the concrete 1 to fix the reference electrode device 3 to the concrete 1. The electric wire 6 is connected to the voltmeter 5 from the reinforcing bar 2 buried in the concrete 1 and the metal lead electrode 7 of the reference electrode device 3, and the reading V of the voltmeter is compared with the above-mentioned characteristic potential E of the electrode device (-meter). +Eb), the potential E1 of the reinforcing steel
Measure.
作用
上記構成を有する本発明にようコンクリート中の鉄筋電
位測定法においては、照合電極装置３がコンクリート１
に接触したアルカリ性雰囲気中に長期間放置されても安
定した照合電極電圧計及び対コンクリート接触電圧Ｅｂ
を与えるから、鉄筋電位Ｅｉの長期間監視を安定的に確
保する。Function: In the reinforcing steel potential measurement method in concrete according to the present invention having the above-mentioned configuration, the reference electrode device 3 is connected to the concrete 1.
Reference electrode voltmeter and concrete contact voltage Eb that is stable even when left in an alkaline atmosphere for a long time in contact with
Therefore, stable long-term monitoring of the reinforcement potential Ei is ensured.
さらに、アルカリ環境用照合電極装置３の充填剤８が固
相であるから、電極装置３の取付けが例えＥ向きであっ
ても極めて容易である。Furthermore, since the filler 8 of the reference electrode device 3 for alkaline environments is a solid phase, it is extremely easy to attach the electrode device 3 even if the electrode device 3 is oriented in the E direction.
実施例
第１図、第６図、及び第７図は、本発明によるコンクリ
ート中の鉄筋電位測定法をコンクリート道路橋構造１ａ
に適用した実施例を示す。実際には、梁部分１２及び床
板部分１３に照合電極装置３を約５０ｃｍ間隔で取付け
たが、簡明のため第１図には、床板部分１３における照
合電極装置３のみを示す。また、第１図は、コンクリー
ト道路橋構Ｊａｌａ中の鉄筋２を点線で１木のみ示すが
、多数の鉄筋２がコンクリート中に配置されていること
は言うまでもない。Embodiments FIGS. 1, 6, and 7 show the method of measuring reinforcing bar potential in concrete according to the present invention in a concrete road bridge structure 1a.
An example in which this method is applied is shown below. Actually, the reference electrode devices 3 were attached to the beam portion 12 and the floor plate portion 13 at intervals of about 50 cm, but for the sake of clarity, only the reference electrode devices 3 in the floor plate portion 13 are shown in FIG. Although FIG. 1 shows only one reinforcing bar 2 in the concrete road bridge structure Jala with dotted lines, it goes without saying that many reinforcing bars 2 are placed in the concrete.
本発明方法で使われるアルカリ環境用照合電極装置３の
一実施例を第５図に示す。金属鉛電極７を、ケース９内
のこの場合水酸化カルシウムとセラコラからなる固相充
填剤８の中に配置する。ケース９の一端を、エポキシ樹
脂等からなるカバー１０により封止し、その他端に固相
充填剤８を露出させコンクリート１との直接接触の便を
図る。An embodiment of the reference electrode device 3 for alkaline environment used in the method of the present invention is shown in FIG. A metallic lead electrode 7 is placed in a case 9 in a solid phase filler 8 consisting in this case of calcium hydroxide and Ceracola. One end of the case 9 is sealed with a cover 10 made of epoxy resin or the like, and the solid phase filler 8 is exposed at the other end to facilitate direct contact with the concrete 1.
カバー１０の外側表面に設けた電極端子７ａに金属鉛電
極７を接続し、測定時に電線６を電極端子７ａに接続す
る。金属鉛電極７にリード線を固着し、カバ−１０を貫
通してそのリード線を外部へ引出すことにより電極端子
７ａを省略してもよい。A metal lead electrode 7 is connected to an electrode terminal 7a provided on the outer surface of the cover 10, and an electric wire 6 is connected to the electrode terminal 7a during measurement. The electrode terminal 7a may be omitted by fixing a lead wire to the metal lead electrode 7 and extending the lead wire to the outside through the cover 10.
複数の照合電極装置３及び共通の鉄筋端子４が電！！６
により電位記録装置１１へ接続され、適当なスイッチ（
図示せず）を介して各照合電極装置３の実効出力電圧Ｅ
（＝Ｅｒ４ｂ）が電位記録装置１１の電圧計５へ加えら
れる。（２）式による各照合電極位置における鉄筋電位
Ｅｉが計算手段（図示せず）によって算出され、電位記
録計１１に記録される。A plurality of reference electrode devices 3 and a common reinforcing bar terminal 4 are electrically connected! ! 6
is connected to the potential recording device 11 by a suitable switch (
(not shown) to the effective output voltage E of each reference electrode device 3
(=Er4b) is applied to the voltmeter 5 of the potential recording device 11. The reinforcement potential Ei at each reference electrode position according to equation (2) is calculated by a calculation means (not shown) and recorded on the potential recorder 11.
こうして得られた鉄筋の電位分布を第７図の展開図に示
す、同図左下に比較的鉄筋電位Ｅｉの低い部分があるが
、この部分にはクラックが測定前から認められ、外観上
からも鉄筋の腐食が予想されていた。即ち１本発明によ
り、コンクリート中の鉄筋の電位を長期間に亘り安定的
に測定し、鉄筋腐食を定量的に推定することができる事
実が実証された。The potential distribution of the reinforcing bars obtained in this way is shown in the developed diagram in Figure 7. There is a part in the lower left of the figure where the reinforcing bar potential Ei is relatively low, but cracks were observed in this part even before the measurement, and from the external appearance. Corrosion of the reinforcing steel was expected. That is, according to the present invention, it has been demonstrated that the potential of reinforcing bars in concrete can be stably measured over a long period of time, and corrosion of reinforcing bars can be quantitatively estimated.
第８図は、コンクリートケーソン１ｂの防食電位監視に
本発明によるコンクリート中の鉄筋電位測定法を適用し
た実施例を示す、この場合には、流電陽極１４によって
行われている電気防食実施時における防食電位を確認す
る。FIG. 8 shows an example in which the reinforcing bar potential measurement method in concrete according to the present invention is applied to monitoring the corrosion protection potential of the concrete caisson 1b. Check the corrosion protection potential.
発明の効果 ′□
以上説明した如く、本発明によるコンクリート中の鉄筋
電位測定法は、特殊のアルカリ環境用照合電極装置３を
使用するので次の顕著な効果を奏する。Effects of the invention'□ As explained above, the method for measuring reinforcing steel potential in concrete according to the present invention uses the special reference electrode device 3 for use in alkaline environments, and therefore has the following remarkable effects.
（イ）コンクリート中の鉄筋電位を長期間に亘り安定的
に測定することができる。(a) The reinforcing steel potential in concrete can be measured stably over a long period of time.
（ロ）照合電極装置の電極電位の変化が少ないから、そ
の頻繁な交換が不要である。(b) Since there is little change in the electrode potential of the reference electrode device, frequent replacement is not necessary.
（ハ）従来不可能であった照合電極交換が困難な部位に
おけるコンクリート中鉄筋電位の連続監視ができる。(c) It is possible to continuously monitor the reinforcing bar potential in concrete in areas where it is difficult to replace reference electrodes, which was previously impossible.
（ニ）上向き取付けを要する部位においても照合電極装
置を容易に取付けることができる。(d) The reference electrode device can be easily attached even in locations that require upward attachment.
第１図は本発明の一実施例の図式的説明図、第２図及び
第３図は本発明方法原理の説明図、第４図は照合電極電
位の変動を示すグラフ、第５図は照合電極装置の図式的
断面図、第６図及び第７図は第１図の実施例の測定結果
の説明図、第８図は他の実施例の説明図である。
１・・・コンクリート、ｌａ・・・コンクリート道路橋
構造、Ｉｂ・・・コンクリートケーソン、２・・・鉄筋
、３・・・照合電極装置、４・・・鉄筋端子、５・・・
電圧計、６・・・電線、７・・・金属鉛電極、８・・・
充填剤、９・・・ケース、１０・・・カバー、１１・・
・を位記録装置、１２・・・梁部分、１３・・・床板部
分、１４・・・流電陽極。Fig. 1 is a diagrammatic illustration of an embodiment of the present invention, Figs. 2 and 3 are explanatory diagrams of the principle of the method of the invention, Fig. 4 is a graph showing fluctuations in reference electrode potential, and Fig. 5 is a comparison diagram. A schematic cross-sectional view of the electrode device, FIGS. 6 and 7 are explanatory diagrams of the measurement results of the embodiment of FIG. 1, and FIG. 8 is an explanatory diagram of another embodiment. DESCRIPTION OF SYMBOLS 1... Concrete, la... Concrete road bridge structure, Ib... Concrete caisson, 2... Rebar, 3... Reference electrode device, 4... Rebar terminal, 5...
Voltmeter, 6... Electric wire, 7... Metal lead electrode, 8...
Filler, 9... Case, 10... Cover, 11...
・Position recording device, 12... Beam portion, 13... Floor plate portion, 14... Galvanic anode.
Claims (1)
された金属鉛電極からなるアルカリ性環境用照合電極装
置を前記固相充填剤の表面においてコンクリート表面及
び／又は内部に固定し、前記コンクリート中に埋設され
た鉄筋及び前記照合電極装置を電圧計に接続し、電圧計
の読みと前記照合電極装置の固有電位との差として前記
鉄筋の電位を測定してなるコンクリート中の鉄筋電位測
定法。A reference electrode device for alkaline environments consisting of a metal lead electrode placed in a solid filler with a low contact potential difference with concrete is fixed on the surface and/or inside of the concrete on the surface of the solid filler, and A method for measuring the potential of reinforcing bars in concrete by connecting the buried reinforcing bars and the reference electrode device to a voltmeter, and measuring the potential of the reinforcing bars as the difference between the reading of the voltmeter and the characteristic potential of the reference electrode device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59244677A JPS61124863A (en) | 1984-11-21 | 1984-11-21 | Method for measuring potential of reinforcing bar in concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59244677A JPS61124863A (en) | 1984-11-21 | 1984-11-21 | Method for measuring potential of reinforcing bar in concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61124863A true JPS61124863A (en) | 1986-06-12 |
| JPH0435032B2 JPH0435032B2 (en) | 1992-06-09 |
Family
ID=17122303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59244677A Granted JPS61124863A (en) | 1984-11-21 | 1984-11-21 | Method for measuring potential of reinforcing bar in concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61124863A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6344159A (en) * | 1986-08-11 | 1988-02-25 | Ohbayashigumi Ltd | Detection of concrete casting level |
| JPS6367558A (en) * | 1986-08-29 | 1988-03-26 | ノルウェージィアン コンクリート テクノロジーズ アクティー ゼルスカブ | Method of positioning region to be repaired of reinforced concrete structure |
| JP2008241620A (en) * | 2007-03-28 | 2008-10-09 | National Institute Of Advanced Industrial & Technology | Electrometry device |
| JP2013249635A (en) * | 2012-05-31 | 2013-12-12 | Ps Mitsubishi Construction Co Ltd | Rust-proofing effect confirmation method by rust-proofing agent aqueous solution injection in grout unfilled cavity |
| JP2018004347A (en) * | 2016-06-29 | 2018-01-11 | 株式会社ピーエス三菱 | Steel material potential measurement method |
-
1984
- 1984-11-21 JP JP59244677A patent/JPS61124863A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6344159A (en) * | 1986-08-11 | 1988-02-25 | Ohbayashigumi Ltd | Detection of concrete casting level |
| JPH0422463B2 (en) * | 1986-08-11 | 1992-04-17 | Obayashi Constr Co Ltd | |
| JPS6367558A (en) * | 1986-08-29 | 1988-03-26 | ノルウェージィアン コンクリート テクノロジーズ アクティー ゼルスカブ | Method of positioning region to be repaired of reinforced concrete structure |
| JP2008241620A (en) * | 2007-03-28 | 2008-10-09 | National Institute Of Advanced Industrial & Technology | Electrometry device |
| JP2013249635A (en) * | 2012-05-31 | 2013-12-12 | Ps Mitsubishi Construction Co Ltd | Rust-proofing effect confirmation method by rust-proofing agent aqueous solution injection in grout unfilled cavity |
| JP2018004347A (en) * | 2016-06-29 | 2018-01-11 | 株式会社ピーエス三菱 | Steel material potential measurement method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0435032B2 (en) | 1992-06-09 |
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