JPH02126147A - Method for measuring crack depth of reinforced concrete - Google Patents
Method for measuring crack depth of reinforced concreteInfo
- Publication number
- JPH02126147A JPH02126147A JP27874688A JP27874688A JPH02126147A JP H02126147 A JPH02126147 A JP H02126147A JP 27874688 A JP27874688 A JP 27874688A JP 27874688 A JP27874688 A JP 27874688A JP H02126147 A JPH02126147 A JP H02126147A
- Authority
- JP
- Japan
- Prior art keywords
- crack
- concrete
- electrical resistance
- depth
- resistance value
- 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 description 12
- 238000000034 method Methods 0.000 title description 18
- 239000004567 concrete Substances 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 25
- 239000007864 aqueous solution Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 3
- 239000000347 magnesium hydroxide Substances 0.000 description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 101700004678 SLIT3 Proteins 0.000 description 1
- 102100027339 Slit homolog 3 protein Human genes 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Abstract
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のひび割れ深さ測定方法に関
する
〔従来の技術〕
鉄筋コンクリート構造物に表面から内部へ向けひび割れ
が入った場合、それが表層だけのものか、内部深く鉄筋
まで達しているものかを知ることは補修の要否を判断す
る上で重要である。しかして従来、このひび割れ深さの
検知にあたっては、ひび割れの表面の開口量の大きさか
らひび割れの深さを推定し、コンクリートとのかぶり厚
みと比較して経験的にひび割れが鉄筋まで達しているか
を推定している。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for measuring the depth of cracks in reinforced concrete [Prior Art] When a crack appears in a reinforced concrete structure from the surface to the inside, it is possible to determine whether the crack is only at the surface layer. It is important to know whether the damage is serious or has reached the reinforcing steel deep inside in order to determine whether repairs are necessary. However, conventionally, when detecting the depth of a crack, the depth of the crack is estimated from the size of the opening on the surface of the crack, and compared with the thickness of the cover with the concrete, it is empirically determined whether the crack has reached the reinforcing steel. is estimated.
しかしながら、コンクリートにひび割れが発生している
部には、単純引張り力の他に圧縮力１曲げ力等複雑な外
力が作用している場合が多いので、従来の割れ表面の開
口量の大きさだけでひび割れが鉄筋まで達しているかを
判定するには無理があり、精度的に問題がある。However, in addition to simple tensile force, complex external forces such as compressive force and bending force are often acting on areas where cracks occur in concrete. It is impossible to determine whether a crack has reached the reinforcing steel, and there are problems with accuracy.
本発明は、このような事情に迄みて提案されたもので、
鉄筋コンクリートのひび割れ深さを簡便かつ正確に測定
することができ、ひいては鉄筋コンクリート構造物の補
修要否の判断を容易に行うことができる鉄筋コンクリー
トのひび割れ深さ測定方法を提供すること・を目的とす
る。The present invention was proposed in view of these circumstances.
It is an object of the present invention to provide a method for measuring the depth of cracks in reinforced concrete, which can easily and accurately measure the depth of cracks in reinforced concrete, and by which it is possible to easily determine whether or not repair of a reinforced concrete structure is necessary.
〔課題を解決するための手段］
そのために本発明は、適宜のかぶり厚みを有して内部に
鉄筋を埋設しているコンクリートの表面から内部に向か
うひび割れの深さを測定するにあたり、上記コンクリー
トのひび割れに高導電率液体を流し込んで同ひび割れ部
の表面と上記鉄筋との間の電気抵抗を測定するとともに
、上記コンクリートの健全部と上記鉄筋間の電気抵抗と
上記高導電率液体中の上記かぶり厚み相当の間隔の電気
抵抗とをそれぞれ測定し、上記高導電率液体の電気抵抗
値を基準に上記ひび割れ部の電気抵抗値と上記健全部の
電気抵抗値を対比することにより上記ひび割れの深さを
推定することを特徴とする。[Means for Solving the Problems] To this end, the present invention provides a method for measuring the depth of cracks inward from the surface of concrete in which reinforcing bars are embedded with an appropriate cover thickness. A high conductivity liquid is poured into the crack and the electrical resistance between the surface of the crack and the reinforcing bars is measured, and the electrical resistance between the sound part of the concrete and the reinforcing bars and the fog in the high conductivity liquid are measured. The depth of the crack can be determined by measuring the electrical resistance at intervals corresponding to the thickness, and comparing the electrical resistance value of the cracked part and the electrical resistance value of the sound part based on the electrical resistance value of the high conductivity liquid. It is characterized by estimating.
本発明方法において、コンクリートのひび割れに流し込
む高導電率液体はひび割れ内部に浸入するので、ひび割
れが鉄筋まで達していれば、ひび割れ部の表面と鉄筋と
は高導電率液体で結ばれ両者間の電気抵抗は液体そのも
のの電気抵抗値とほぼ同じになり、また表層部のみのひ
び割れであれば健全部の電気抵抗値とほぼ同じとなる。In the method of the present invention, the highly conductive liquid poured into the concrete cracks infiltrates into the cracks, so if the crack reaches the reinforcing bars, the surface of the crack and the reinforcing bars are connected by the highly conductive liquid, and the electricity between them is The resistance will be almost the same as the electrical resistance of the liquid itself, and if the cracks are only in the surface layer, it will be almost the same as the electrical resistance of the healthy part.
更にひび割れがコンクリートの表面と鉄筋の中間に止ま
っている場合には、高導電率液体の電気抵抗値を基準に
してひび割れ部の電気抵抗値と健全部の電気抵抗値を対
比すれば、ひび割れの先端がコンクリート内部のどの位
置にあるかが推定される。Furthermore, if the crack is located between the concrete surface and the reinforcing steel, comparing the electrical resistance value of the cracked part with the electrical resistance value of the healthy part using the electrical resistance value of the high conductivity liquid as a reference, it is possible to determine the extent of the crack. It is estimated where the tip is located inside the concrete.
本発明鉄筋コンクリートのひび割れ深さ測定方法の一実
施例を図面について説明すると、第１図は本発明方法の
実施態様を示す模式図、第２図は同上におけるアース端
子の取付は要領を示す説明図、第３図は第１図の方法に
よる測定結果に基づきひび割れ深さを推定する要領の説
明図、第４図は具体的実験例におけるコンクリートのひ
び割れ状態を示す斜視図、第５図は同上におけるひび割
れ深さと電気抵抗値の関係を示す線図である。An embodiment of the method for measuring crack depth in reinforced concrete according to the present invention will be explained with reference to the drawings. Figure 1 is a schematic diagram showing an embodiment of the method of the present invention, and Figure 2 is an explanatory diagram showing the procedure for installing the ground terminal in the same method. , Fig. 3 is an explanatory diagram of the procedure for estimating the crack depth based on the measurement results by the method shown in Fig. 1, Fig. 4 is a perspective view showing the state of cracks in concrete in a specific experimental example, and Fig. 5 is an explanatory diagram of the method of estimating the crack depth based on the measurement results according to the method shown in Fig. 1. FIG. 3 is a diagram showing the relationship between crack depth and electrical resistance value.
まず第１図において、適宜のかぶり厚みｔを持って内部
に鉄筋１を埋設するコンクリート２のひび割れ３に、水
酸化マグネシウム水溶液、水酸化カルシウム水溶液、酸
化鉄水溶液９食塩水等の高導電率液体４を表面まで流し
込み、この高導電率液体４の表面部と鉄筋１接続のアー
ス端子５との間に、電気抵抗計６を有する測定回路７ａ
を接続する。またコンクリート２の表面の健全部８に同
じ高導電率液体４を塗布したうえ、この健全部８とアー
ス端子５との間に、電気抵抗計６を有する測定回路７ｂ
を接続する。更に高導電率液体４を入れた液体容器９中
に、かぶり厚みと等しい間隔ｔで立てた一対の端子棒１
０．１０に電気抵抗計６を有する測定回路７ｃを接続す
る。First, in Fig. 1, a highly conductive liquid such as magnesium hydroxide aqueous solution, calcium hydroxide aqueous solution, iron oxide aqueous solution 9 saline solution, etc. 4 is poured to the surface, and a measuring circuit 7a having an electric resistance meter 6 is connected between the surface of this high conductivity liquid 4 and the ground terminal 5 connected to the reinforcing bar 1.
Connect. Further, the same high conductivity liquid 4 is applied to a sound part 8 on the surface of the concrete 2, and a measuring circuit 7b having an electric resistance meter 6 is connected between this sound part 8 and the earth terminal 5.
Connect. Furthermore, a pair of terminal rods 1 are set up in a liquid container 9 containing a high conductivity liquid 4 at a distance t equal to the cover thickness.
A measurement circuit 7c having an electrical resistance meter 6 is connected to the 0.10.
なお上記測定回路？ａ、７ｂの形成にあたり、既設のコ
ンクリート２で鉄筋１が表面に露出していない場合には
、第２図（Ａ）におけるように、強度的に問題がないコ
ンクリート部分を削ってアース端子５を取付けるか、新
規造成のコンクリート２の場合には、同図（Ｂ）におけ
るように、鉄筋１に達するカーボン棒１１を埋め込みそ
の表面にアース端子５を取付ける。What about the above measurement circuit? When forming parts a and 7b, if the reinforcing bars 1 are not exposed on the surface of the existing concrete 2, as shown in Fig. 2 (A), the ground terminal 5 should be ground by scraping the concrete part that does not have any strength problems. In the case of newly constructed concrete 2, a carbon rod 11 reaching the reinforcing bar 1 is embedded and a ground terminal 5 is attached to the surface of the carbon rod 11, as shown in FIG.
このような電気抵抗測定回路７ａ、７ｂ。Such electrical resistance measuring circuits 7a, 7b.
７ｃを形成したうえで、まず測定回路７ｂにより、コン
クリート２の健全部８の表面と内部の鉄筋１との間の電
気抵抗Ｒｂを測定し、また測定回路７Ｃにより高導電率
液体４の間隔を間の電気抵抗ＲＣを測定し、これら測定
値に基づき第３図のように、コンクリート表面からの深
さＴと電気抵抗値Ｒとの関係図を作成する。すなわち、
コンクリート表面からの深さ０点に健全部の抵抗値Ｒｂ
をとり１、コンクリート表面からの深さｔ点に液体の抵
抗値Ｒｃをとったうえ、この２点Ｒｂ、Ｒｃを直線で結
び、これを抵抗値線Ｒｉとする。7c, first, the measuring circuit 7b measures the electrical resistance Rb between the surface of the sound part 8 of the concrete 2 and the internal reinforcing bars 1, and the measuring circuit 7C measures the distance between the high conductivity liquids 4. The electrical resistance RC between the concrete surfaces is measured, and based on these measured values, a relationship diagram between the depth T from the concrete surface and the electrical resistance value R is created as shown in FIG. That is,
Resistance value Rb of sound part at depth 0 point from concrete surface
1, take the resistance value Rc of the liquid at a depth t from the concrete surface, connect these two points Rb and Rc with a straight line, and make this the resistance value line Ri.
しかして測定回路７ａにより、コンクリート２のひび割
れ３表面と内部の鉄筋１との間の電気抵抗Ｒａを測定し
、この測定値Ｒａを第３図の抵抗値線Ｒｉ上にプロット
すると、この抵抗値Ｒｉ上でＲａに相当するコンクリー
ト表面からの深さｔａが、ひび割れ３の深さを推定する
ことになる。The measuring circuit 7a measures the electrical resistance Ra between the surface of the crack 3 in the concrete 2 and the internal reinforcement 1, and when this measured value Ra is plotted on the resistance value line Ri in FIG. The depth ta from the concrete surface, which corresponds to Ra on Ri, estimates the depth of the crack 3.
なお上記の場合は図−ヒにて深さｔａを求める方法を説
明したが、第３図において、（Ｒｂ−Ｒｃ）： （Ｒ
ｂ ・−Ｒａ）＝ｔ ： ｔａの比例関係が成り立つの
で、これより、の計算を行うことにより、ひび割れ３の
深さを算出推定することができる。Note that in the above case, the method for determining the depth ta was explained in Figure-H, but in Figure 3, (Rb-Rc): (R
b · - Ra) = t : Since the proportional relationship of ta holds true, the depth of the crack 3 can be calculated and estimated by calculating from this.
次に本発明方法の成立性と効果を実証する具体的実験例
を第４図、第５図について説明する。Next, a specific experimental example for demonstrating the feasibility and effectiveness of the method of the present invention will be explained with reference to FIGS. 4 and 5.
第４図はひび割れを加工した供試体のコンクリートブロ
ックを示し、その形状寸法は１５０顛×３００璽ｌ×５
０層重で、コンクリート２内部のかぶり厚み３０＋ｎの
鉄筋１まで達しているひび割れ３、表面より深さ１０龍
の機械スリット３′、表面より深さ２０１１の機械スリ
ン］・３″の３種のひび割れを加工しである。Figure 4 shows a concrete block as a specimen with cracks processed, and its dimensions are 150 squares x 300 squares x 5
0 layer weight, crack 3 reaching the reinforcing bar 1 with a cover thickness of 30+n inside the concrete 2, mechanical slit 3' with a depth of 10 dragons from the surface, and mechanical slit with a depth of 2011 mm from the surface]・3'' The cracks have been processed.
この割れ深さの異なる３種のひび割れと健全部の表面部
に水酸化マグネシウム水溶液。An aqueous magnesium hydroxide solution was applied to the three types of cracks with different depths and the surface of the healthy part.
水酸化カルシウム水溶液、酸化鉄水溶液１食塩水および
水道水の５種類の液体を流し込み、流し込み完了から１
０秒後に、これら表面部と鉄筋間の電気抵抗を第１図の
測定回路７ａ。Pour 5 types of liquids: 1 calcium hydroxide aqueous solution, 1 iron oxide aqueous solution, saline water and tap water, and 1 after pouring is completed.
After 0 seconds, the electrical resistance between these surface parts and the reinforcing bars is measured by the measuring circuit 7a of FIG.
７ｂにより測定するとともに、上記各液体の電気抵抗を
第１図の測定回路７Ｃにより測定し、その結果を第５図
に示した。7b, and the electrical resistance of each liquid was also measured using the measuring circuit 7C shown in FIG. 1, and the results are shown in FIG.
第５図に示すように、この中で電気抵抗Ｒの最も小さい
液体は食塩水で６にΩ、次いで水酸化マグネシウム水溶
液の１５にΩ、酸化鉄水溶液の１８にΩ、水酸化カルシ
ウム水溶液の２ＳｋΩ、水道水の３５にΩの頃になり、
鉄筋１まで達しているひび割れ３の電気抵抗値は、この
部に流し込んだ液体の抵抗値とほぼ同じになった。また
健全部の表面部と鉄筋１間の電気抵抗Ｒは、コンクリー
ト２の表面に食塩水を流した場合２５にΩ、水道水を流
した場合は３０にΩであり、その他の液体を流した場合
はこれらの中間であった。次に、深さ１０１と２０ｍの
機械スリットによるひび割れ３’、３’部の電気抵抗Ｒ
は、健全部の値と鉄筋１まで達したひび割れ３の値すな
わち液体の抵抗値Ｒを直線で結んだ線近傍の値となった
。As shown in Figure 5, among these liquids, the liquids with the lowest electrical resistance R are saline solution with 6Ω, followed by magnesium hydroxide aqueous solution with 15Ω, iron oxide aqueous solution with 18Ω, and calcium hydroxide aqueous solution with 2SkΩ. , when the tap water reached 35Ω,
The electrical resistance value of the crack 3 that reached the reinforcing bar 1 was almost the same as the resistance value of the liquid poured into this part. In addition, the electrical resistance R between the surface of the healthy part and the reinforcing bar 1 is 25Ω when saline water is poured on the surface of the concrete 2, 30Ω when tap water is poured on the surface of the concrete 2, and when other liquids are poured The case was between these. Next, the electrical resistance R of the cracks 3' and 3' due to the mechanical slits with depths of 101 and 20 m.
was a value near a line connecting the value of the sound part and the value of the crack 3 that reached the reinforcing bar 1, that is, the resistance value R of the liquid, with a straight line.
従ってこの実験例結果から、第１図の測定回路７ｂ、７
ｃにより、健全部と使用する高導電率液体の電気抵抗値
を測定してコンクリートのかぶり厚み間にわたる直線状
の抵抗値線を想定し、この抵抗値線を実際に図示するか
又は測定値を記録しておき、測定回路７ａによるひび割
れ部の電気抵抗値を上記抵抗値線に関し実際図上にプロ
ットすること又は前記計算式により、測定電気抵抗値に
対応するひび割れ深さを推定することができる。Therefore, from the results of this experimental example, it is clear that the measurement circuits 7b and 7 in FIG.
c, measure the electrical resistance value of the healthy part and the high conductivity liquid used, assume a straight resistance value line spanning the concrete cover thickness, and either actually draw this resistance value line or record the measured value. The crack depth corresponding to the measured electrical resistance value can be estimated by recording the electrical resistance value of the cracked part obtained by the measuring circuit 7a and plotting it on the actual diagram with respect to the resistance value line, or by using the above calculation formula. .
要するに本発明によれば、適宜のかぶり厚みを有して内
部に鉄筋を埋設しているコンクリートの表面から内部に
向かうひび割れの深さを測定するにあたり、上記コンク
リートのひび割れに高導電率液体を流し込んで同ひび割
れ部の表面と上記鉄筋との間の電気抵抗を測定するとと
もに、上記コンクリートの健全部と上記鉄筋間の電気抵
抗と上記高導電率液４゜
体中の上記かふり厚み相当の間隔の電気抵抗とをそれぞ
れ測定し、上記高導電率液体の電気抵抗値を基準に上記
ひび割れ部の電気抵抗値と上記健全部の電気抵抗値を対
比することにより上記ひび割れの深さを推定することに
より、鉄筋コンクリートのひび割れ深さを簡便かつ正確
に測定することができ、ひいては鉄筋コンクリート構造
物の補修要否の判断を容易に行うことができる鉄筋コン
クリートのひび割れ深さ測定方法を得るから、本発明は
産業上極めて有益なものである。In short, according to the present invention, when measuring the depth of a crack inward from the surface of concrete in which reinforcing bars are embedded with an appropriate cover thickness, a highly conductive liquid is poured into the crack in the concrete. Measure the electrical resistance between the surface of the cracked part and the reinforcing bars, and also measure the electrical resistance between the sound part of the concrete and the reinforcing bars and the distance equivalent to the thickness of the burlap in the high conductivity liquid 4°. and estimating the depth of the crack by comparing the electrical resistance value of the cracked part and the electrical resistance value of the sound part based on the electrical resistance value of the high conductivity liquid. As a result, the present invention provides a method for measuring the crack depth of reinforced concrete that can easily and accurately measure the crack depth of reinforced concrete, and furthermore, can easily determine whether or not repair of a reinforced concrete structure is necessary. Above all, it is extremely useful.
第１図は本発明鉄筋コンクリートのひび割れ深さ測定方
法の一実施例における実施態様を示す模式図、第２図は
同上におけるアース端子の取付は要領を示す説明図、第
３図は第１図の方法による測定結果に基づきひび割れ深
さを推定する要領の説明図、第４図は具体的実験例にお
けるコンクリートのひび割れ状態を示す斜視図、第５図
は同上におけるひび割れ深さと電気抵抗値の関係を示す
線図である。
１・・・鉄筋、２・・・コンクリート、３・・・ひび割
れ、４・・・高導電率液体、５・・・アース端子、６・
・・電気抵抗計、？ａ、７ｂ、７ｃ・・・測定回路、８
・・・健全部、９・・・液体容器、１０・・・端子棒、
１１・・・カーボン棒。FIG. 1 is a schematic diagram showing an embodiment of the method for measuring crack depth in reinforced concrete according to the present invention, FIG. Fig. 4 is a perspective view showing the state of cracks in concrete in a specific experimental example, and Fig. 5 shows the relationship between crack depth and electrical resistance value in the same method. FIG. 1...Reinforcement bar, 2...Concrete, 3...Crack, 4...High conductivity liquid, 5...Earth terminal, 6...
...Electric resistance meter? a, 7b, 7c... measurement circuit, 8
...Healthy part, 9...Liquid container, 10...Terminal bar,
11... Carbon rod.
Claims (1)
れの深さを測定するにあたり、上記コンクリートのひび
割れに高導電率液体を流し込んで同ひび割れ部の表面と
上記鉄筋との間の電気抵抗を測定するとともに、上記コ
ンクリートの健全部と上記鉄筋間の電気抵抗と上記高導
電率液体中の上記かぶり厚み相当の間隔の電気抵抗とを
それぞれ測定し、上記高導電率液体の電気抵抗値を基準
に上記ひび割れ部の電気抵抗値と上記健全部の電気抵抗
値を対比することにより上記ひび割れの深さを推定する
ことを特徴とする鉄筋コンクリートのひび割れ深さ測定
方法。[Claims] To measure the depth of cracks inward from the surface of concrete in which reinforcing bars are embedded with an appropriate cover thickness, a highly conductive liquid is poured into the cracks in the concrete. In addition to measuring the electrical resistance between the surface of the cracked part and the reinforcing bars, the electrical resistance between the sound part of the concrete and the reinforcing bars and the electrical resistance at intervals corresponding to the cover thickness in the high conductivity liquid are measured. Reinforced concrete characterized in that the depth of the crack is estimated by measuring each and comparing the electrical resistance value of the cracked part and the electrical resistance value of the sound part based on the electrical resistance value of the high conductivity liquid. How to measure crack depth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27874688A JPH02126147A (en) | 1988-11-04 | 1988-11-04 | Method for measuring crack depth of reinforced concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27874688A JPH02126147A (en) | 1988-11-04 | 1988-11-04 | Method for measuring crack depth of reinforced concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02126147A true JPH02126147A (en) | 1990-05-15 |
Family
ID=17601626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27874688A Pending JPH02126147A (en) | 1988-11-04 | 1988-11-04 | Method for measuring crack depth of reinforced concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02126147A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5612621A (en) * | 1992-10-27 | 1997-03-18 | Industrial Technology Research Institute | Method for monitoring cracks and critical concentration by using phase angle |
| WO2021095166A1 (en) * | 2019-11-13 | 2021-05-20 | 日本電信電話株式会社 | Estimation method, estimation device, and program |
-
1988
- 1988-11-04 JP JP27874688A patent/JPH02126147A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5612621A (en) * | 1992-10-27 | 1997-03-18 | Industrial Technology Research Institute | Method for monitoring cracks and critical concentration by using phase angle |
| WO2021095166A1 (en) * | 2019-11-13 | 2021-05-20 | 日本電信電話株式会社 | Estimation method, estimation device, and program |
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