JPH0422464B2 - - Google Patents
Info
- Publication number
- JPH0422464B2 JPH0422464B2 JP23450986A JP23450986A JPH0422464B2 JP H0422464 B2 JPH0422464 B2 JP H0422464B2 JP 23450986 A JP23450986 A JP 23450986A JP 23450986 A JP23450986 A JP 23450986A JP H0422464 B2 JPH0422464 B2 JP H0422464B2
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- corrosion
- ammeter
- reinforcing bars
- reinforcing
- 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.)
- Expired
Links
- 230000003014 reinforcing effect Effects 0.000 claims description 27
- 239000004567 concrete Substances 0.000 claims description 23
- 238000005260 corrosion Methods 0.000 claims description 22
- 230000007797 corrosion Effects 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 11
- 239000011150 reinforced concrete Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 150000003841 chloride salts Chemical class 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Description
【発明の詳細な説明】
≪産業上の利用分野≫
本発明は鉄筋コンクリート中の鉄筋がコンクリ
ートの中性化や塩化物の作用で腐食する状態にあ
るかどうかを簡単に判定する鉄筋コンクリートの
鉄筋腐食状態調査方法に関する。[Detailed Description of the Invention] <<Industrial Application Field>> The present invention is a method for easily determining whether or not the reinforcing bars in reinforced concrete are corroded due to concrete neutralization or the action of chlorides. Regarding research methods.
≪従来の技術≫
従来はコンクリートを部分的に破壊して内部の
鉄筋を露出する。そして、この露出箇所を目視す
ることにより鉄筋の腐食状態やその程度を判定し
ていた。<<Conventional technology>> Conventionally, concrete is partially destroyed to expose the internal reinforcing steel. The state and degree of corrosion of the reinforcing bars was determined by visually observing these exposed locations.
あるいは壁やスラブから抜き取つたコンクリー
トコアを検査するものであつた。 Alternatively, it was used to inspect concrete cores extracted from walls or slabs.
このような判定方法ではコンクリートコアの抜
き取り作業、コンクリートの斫り作業等いずれに
しても大きい労力と後の補修作業が伴う。 In any case, such a determination method requires a large amount of labor and subsequent repair work, such as concrete core extraction work and concrete scooping work.
また、自から調査箇所および調査数とも制約を
受け、構造体耐力への悪影響もあつた。 In addition, we were also limited in terms of survey locations and number of surveys, which had a negative impact on the strength of the structure.
腐食程度を判断するに際しても、鉄筋がコンク
リートに埋込まれる前に発生した錆かどうかは不
明であり、反対に鉄筋に錆が見られない状態であ
つても、鉄筋が腐食する状況に至つている場合が
あり、判断を誤ることも止むを得ない懸念を残し
ていた。 When determining the degree of corrosion, it is unclear whether or not rust occurred before the reinforcing bars were embedded in concrete.On the other hand, even if there is no rust on the reinforcing bars, it is possible that the reinforcing bars are corroded. In some cases, there were unavoidable concerns that the decision could be made incorrectly.
≪発明が解決しようとする問題点≫
従来、コンクリート中の鋼材は、コンクリート
が保持している強アルカリ性雰囲気中におかれて
いるため、その酸化還元作用は止められている。<<Problems to be Solved by the Invention>> Conventionally, steel in concrete has been placed in a strong alkaline atmosphere held by the concrete, so its oxidation-reduction action has been stopped.
しかし、大気中の炭酸ガスや何らかの酸性物質
がコンクリートに作用し、長年の間にコンクリー
トのアルカリ性は失われ、次第に鋼材の腐食が始
まるのである。このことのほかに、コンクリート
中に一定量以上の密度で水溶性塩化物が含入して
いると、アルカリ性雰囲気中にあつても腐食が誘
発される。 However, carbon dioxide gas and some acidic substances in the atmosphere act on the concrete, and over many years the concrete loses its alkalinity, and the steel gradually begins to corrode. In addition to this, if water-soluble chlorides are contained in concrete at a density above a certain level, corrosion will be induced even in an alkaline atmosphere.
最近、除塩処理が不十分な海産骨材や潮風によ
つ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、コンクリート鉄筋の腐食原
因になつている現象も明らかになつた。 Recently, it has become clear that marine aggregates that have not been sufficiently desalinated and sea salt particles carried by the sea breeze dissolve in rainwater and accumulate in concrete, causing corrosion of concrete reinforcing bars. .
叙述の状況にあつて、コンクリート中の鋼材の
腐食状態を簡単に調査、診断できる方法が要求さ
れる。 In the situation described above, there is a need for a method that can easily investigate and diagnose the corrosion state of steel in concrete.
本発明は上記事情に鑑みてなされたものであつ
て、その目的は、簡単迅速に鉄筋の腐食状態とそ
のの進行速度とを判別できる鉄筋コンクリートの
鉄筋腐食状態調査方法を提供するにある。 The present invention has been made in view of the above circumstances, and its object is to provide a method for investigating the corrosion state of reinforcing bars in reinforced concrete that can easily and quickly determine the corrosion state of reinforcing bars and the rate of progress thereof.
≪問題点を解決するための手段≫
上記目的を達成するために、本発明に係る鉄筋
コンクリートの鉄筋腐食状態調査方法は、まず、
鉄筋コンクリート中の被測定鉄筋に電流計の一極
を直接に接続し、該電流計の他極には金属を接続
し、被測定鉄筋の所望測定箇所近傍のコンクリー
ト表面を導電性溶液で濡らしてからこの部分に金
属を当接させて電流計の電流値によつて被測定鉄
筋の腐食の程度とその進行速度とを知ることを特
徴とするのである。<<Means for solving the problems>> In order to achieve the above object, the method for investigating the corrosion state of reinforcing steel in reinforced concrete according to the present invention first includes the following steps:
Connect one pole of an ammeter directly to the reinforcing bar to be measured in reinforced concrete, connect a metal to the other pole of the ammeter, and wet the concrete surface near the desired measurement point of the reinforcing bar to be measured with a conductive solution. The feature is that metal is brought into contact with this part and the degree of corrosion of the reinforcing bar to be measured and its progress rate can be determined from the current value of the ammeter.
≪作用≫
コンクリート中で鉄筋が腐食すると、腐食して
いる部分とそうでない部分とに自由エネルギーの
差が生じる。これが熱力学的には系の安定化のた
めにエネルギーを放出する。この仕事が起電力と
なり、腐食部分はアノードとなつて酸化反応を起
し、他の部分はカソードとなつて還元反応を起す
のである。すなわち、腐食電池とも言うべき状態
が形成され、腐食電流をともなつて腐食が進行す
る。<<Operation>> When reinforcing steel corrodes in concrete, there is a difference in free energy between the corroded part and the non-corroded part. Thermodynamically, this releases energy to stabilize the system. This work becomes an electromotive force, and the corroded part becomes an anode and causes an oxidation reaction, and the other part becomes a cathode and causes a reduction reaction. That is, a state that can be called a corrosion battery is formed, and corrosion progresses as a result of the corrosion current.
このような状態のコンクリート表面に効果的な
カソードあるいはアノードとなる金属を当て、電
流量を一時的に増幅してこれを電流計で検出し、
電流の向きと量とによつて腐食の程度や進行速度
を知るものである。 A metal that serves as an effective cathode or anode is applied to the concrete surface in this condition, the amount of current is temporarily amplified, and this is detected with an ammeter.
The degree and progress rate of corrosion can be determined by the direction and amount of current.
≪実施例≫
以下、本発明の好適な実施例について図面を参
照にして説明する。<<Example>> Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
第１図に実施の概略を示し、この方法は起電力
の補助に用いる基準電極１と電流計２と導電性水
溶液とを用いている。 An outline of the method is shown in FIG. 1, and this method uses a reference electrode 1, an ammeter 2, and a conductive aqueous solution used to supplement the electromotive force.
基準電極１は鉄と比べて自然電極電位の差が大
きいものが良いので、チタン（Ti）、銅（Pt）、
白金（Pu）等が適している。電流計２は電流測
定範囲が−50μAから200μA程度のものを使用す
る。この電流計は目視による読み取り誤差を回避
するためにデジタル表示で、しかも電流値によつ
て青、黄、赤のランプ３−３ａ−３ｂが点灯する
ようになつている。 The reference electrode 1 should preferably have a large difference in natural electrode potential compared to iron, so titanium (Ti), copper (Pt),
Platinum (Pu) etc. are suitable. The ammeter 2 used has a current measurement range of about -50 μA to 200 μA. This ammeter has a digital display to avoid visual reading errors, and blue, yellow, and red lamps 3-3a-3b are turned on depending on the current value.
マイナス電流は青ランプ３で腐食がないことを
示す。プラス０〜10μAは黄ランプ３ａで腐食の
進行速度は遅いが腐食は始まつている。プラス
10μA以上は大きい速度で腐食していることを表
している。 Negative current indicates blue lamp 3, indicating no corrosion. For plus 0 to 10 μA, the yellow lamp 3a indicates that corrosion is progressing slowly, but corrosion has begun. plus
A value of 10 μA or more indicates corrosion at a high rate.
まず、建造物のコンクリート４の一部を一箇所
だけ斫り、縦鉄筋５の一部を露出させる。この縦
鉄筋５には横鉄筋６が接触して配筋されており、
各鉄筋は電気的に導通可能に接続されているの
で、一部が露出されれば足りる。 First, only one part of the concrete 4 of the building is removed to expose a part of the vertical reinforcing bars 5. Horizontal reinforcing bars 6 are arranged in contact with this vertical reinforcing bar 5,
Since each reinforcing bar is electrically connected, it is sufficient that only a portion of the reinforcing bar is exposed.
次に、電流計２の負極端子に接続したリード線
７の先端にあるクリツプ８を縦鉄筋５が露出した
箇所に挾着する。また、他方の正極端子には基準
電極１を接続する。 Next, a clip 8 at the tip of the lead wire 7 connected to the negative terminal of the ammeter 2 is attached to the exposed portion of the vertical reinforcing bar 5. Further, the reference electrode 1 is connected to the other positive terminal.
基準電極１の詳細を第２図によつて説明する。 The details of the reference electrode 1 will be explained with reference to FIG.
基準電極１は円盤状に形成した銅９によつて把
持円筒１０を立設し、この円筒１０内を通り銅９
に先端を接続したリード線１１を備え、銅９は多
孔質スポンジ１２で被覆している。従つて、この
基準電極１は鉄筋の自然電極電位よりも充分に高
いプラス側の電位差を有する。 The reference electrode 1 has a holding cylinder 10 erected by a copper 9 formed into a disk shape, and the copper 9 passes through the cylinder 10.
The lead wire 11 has a tip connected to the copper 9, and the copper 9 is covered with a porous sponge 12. Therefore, this reference electrode 1 has a sufficiently higher positive potential difference than the natural electrode potential of the reinforcing steel.
すなわち、基準電極１のリード線１１が電流計
２の正極端子に接続される。そして、スポンジ１
２には水道の水など導電性のある水を含ませ、調
査箇所のコンクリート表面にスポンジ１２の部分
を軽く当て、10秒から20秒待つ。そのときの電流
計の表示値またはランプ３−３ａ−３ｂの何れか
の点灯によつて鉄筋の腐食状態を知ることができ
る。 That is, the lead wire 11 of the reference electrode 1 is connected to the positive terminal of the ammeter 2. And sponge 1
2 is soaked in conductive water such as tap water, and the part of the sponge 12 is lightly applied to the concrete surface of the area to be investigated, and then waited for 10 to 20 seconds. The state of corrosion of the reinforcing bars can be known from the value displayed on the ammeter or the lighting of any of the lamps 3-3a-3b at that time.
基準電極１を順次に縦方向あるいは横方向へ移
動しながらコンクリート４の各部位の鉄筋腐食状
態を順次に調査する。 While the reference electrode 1 is sequentially moved vertically or horizontally, the state of reinforcing steel corrosion in each part of the concrete 4 is sequentially investigated.
第３図は鉄筋５の被測定局部と基準電極１とが
直列な電池を構成していることを示している。 FIG. 3 shows that the measured local part of the reinforcing bar 5 and the reference electrode 1 constitute a series battery.
≪発明の効果≫
以上詳しく述べたように、本発明によれば、基
準電極と鉄筋との間に電流計を接続し、調査箇所
コンクリートの表面を導電性水溶液で濡らして鉄
筋の自然電極電位と基準電極とを直列接続した電
池にして、そのときの電流量で鉄筋の腐食状態を
知ることができるので、従来の目視方法に較べ簡
易確実で、かつ迅速な調査診断が可能である。<<Effects of the Invention>> As described in detail above, according to the present invention, an ammeter is connected between the reference electrode and the reinforcing bars, and the surface of the concrete in the investigation area is wetted with a conductive aqueous solution to measure the natural electrode potential of the reinforcing bars. By using a battery connected in series with a reference electrode, the corrosion state of the reinforcing steel can be determined based on the amount of current at that time, making it possible to conduct investigation and diagnosis more simply, reliably, and quickly compared to conventional visual inspection methods.
また、電流計を用いて計測するので、被測定箇
所の水湿程度の影響が小さく、待ち時間も30秒位
で充分である。 In addition, since the measurement is performed using an ammeter, the influence of moisture at the location to be measured is small, and the waiting time of about 30 seconds is sufficient.
第１図は本発明の実施手順を説明する説明図、
第２図は基準電極側の概略構成を示す断面図、第
３図は原理的作用を示す説明図である。
１……基準電極、２……電流計、３……ラン
プ、４……コンクリート、５……縦鉄筋、６……
横鉄筋、７……リード線、８……クリツプ、９…
…銅、１０……把持円筒、１１……リード線、１
２……スポンジ。
FIG. 1 is an explanatory diagram illustrating the implementation procedure of the present invention,
FIG. 2 is a sectional view showing the schematic structure of the reference electrode side, and FIG. 3 is an explanatory view showing the principle operation. 1...Reference electrode, 2...Ammeter, 3...Lamp, 4...Concrete, 5...Vertical reinforcing bar, 6...
Horizontal reinforcing bar, 7...Lead wire, 8...Clip, 9...
...Copper, 10...Gripping cylinder, 11...Lead wire, 1
2...Sponge.
Claims (1)
一極を直接に接続し、該電流計の他極には金属を
接続し、該被測定鉄筋の所望測定箇所近傍のコン
クリート表面を導電性溶液で濡らしてからこの部
分に該金属を当接させて該電流計の電流値によつ
て該被測定鉄筋の腐食の程度とその進行速度とを
知ることを特徴とする鉄筋コンクリートの鉄筋腐
食状態調査方法。1 Connect one pole of an ammeter directly to the reinforcing bar to be measured in reinforced concrete, connect a metal to the other pole of the ammeter, and wet the concrete surface near the desired measurement point of the reinforcing bar to be measured with a conductive solution. 1. A method for investigating the state of corrosion of reinforcing bars in reinforced concrete, characterized in that the metal is brought into contact with this part and the degree of corrosion of the reinforcing bars to be measured and its progress rate are determined from the current value of the ammeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23450986A JPS6390753A (en) | 1986-10-03 | 1986-10-03 | Investigating method for corrosion state of reinforcing iron bar in reinforced concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23450986A JPS6390753A (en) | 1986-10-03 | 1986-10-03 | Investigating method for corrosion state of reinforcing iron bar in reinforced concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6390753A JPS6390753A (en) | 1988-04-21 |
| JPH0422464B2 true JPH0422464B2 (en) | 1992-04-17 |
Family
ID=16972140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23450986A Granted JPS6390753A (en) | 1986-10-03 | 1986-10-03 | Investigating method for corrosion state of reinforcing iron bar in reinforced concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6390753A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3973768B2 (en) * | 1998-07-17 | 2007-09-12 | 株式会社太平洋コンサルタント | Evaluation method of corrosion state of reinforcing steel in concrete structures |
| KR101127500B1 (en) * | 2009-07-28 | 2012-03-23 | 서울도시가스 주식회사 | Apparatus for furnishing water of DCVG measuring equipment |
| US8466695B2 (en) * | 2010-08-19 | 2013-06-18 | Southwest Research Institute | Corrosion monitoring of concrete reinforcement bars (or other buried corrodable structures) using distributed node electrodes |
| CN109632559A (en) * | 2018-12-06 | 2019-04-16 | 天能电池集团有限公司 | A kind of test method of battery grid corrosion resistance |
| CN110672506B (en) * | 2019-10-12 | 2022-07-29 | 安徽省（水利部淮河水利委员会）水利科学研究院（安徽省水利工程质量检测中心站） | Potential automatic monitoring system for accelerated corrosion of steel bar in concrete |
-
1986
- 1986-10-03 JP JP23450986A patent/JPS6390753A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6390753A (en) | 1988-04-21 |
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