JP6532084B2 - Soil ventilation evaluation method and soil ventilation measurement apparatus - Google Patents
Soil ventilation evaluation method and soil ventilation measurement apparatus Download PDFInfo
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Description
本発明は、土壌の通気性を非破壊でかつ精度よく簡易に評価するための土壌通気性評価方法ならびに土壌通気性測定装置に関するものである。 TECHNICAL FIELD The present invention relates to a soil aeration evaluation method and a soil aeration measurement apparatus for nondestructively and accurately and easily evaluating soil aeration.
土壌は一般にｐＨ５〜ｐＨ８の範囲でほぼ中性である。中性環境における土壌にその全部または一部が埋設された鋼材の腐食速度は、環境の通気性、すなわち酸素の供給性によって律速される。同一の土壌であっても、自然含水状態にあれば通気性が良いために鋼材の腐食速度が高く、冠水状態にあれば通気性が悪いために鋼材の腐食速度が低くなる。
このことから、鋼材が埋設された土壌の通気性を評価することは、埋設された鋼材の腐食速度を把握するために重要である。
Soils are generally near neutral in the pH 5 to pH 8 range. The corrosion rate of a steel material embedded entirely or partially in soil in a neutral environment is limited by the permeability of the environment, i.e. the availability of oxygen. Even in the same soil, the corrosion rate of the steel is high because of its good permeability if it is naturally hydrated, and the corrosion rate of the steel is low because of its poor permeability if it is flooded.
From this, it is important to evaluate the permeability of the soil in which the steel is embedded in order to grasp the corrosion rate of the embedded steel.
土壌の通気性を評価するための従来技術としては、例えば、非特許文献１に示されるように、土壌試料を採取して試験室で試料の含水率Ｗおよび飽和含水率Ｗｓを測定し、その比率（Ｗｐ＝Ｗ／Ｗｓ×１００）を含水能Ｗｐとして土壌の通気性を評価する技術が提案されたが、測定に時間を要するなどの問題があった。
また、例えば、非特許文献２に示されるように、古くは「コロージョンサウンド」のような器具を使用して異種金属間に流れる電流値から通気性を評価していたが装置が複雑なため現在は使用されていない。
As prior art for evaluating the aeration of soil, for example, as shown in Non-Patent Document 1, the soil sample is collected and the moisture content W and the saturated moisture content Ws of the sample are measured in a test room, Although a technology has been proposed for evaluating the breathability of soil using the ratio (Wp = W / Ws × 100) as the hydrous capacity Wp, there have been problems such as that it takes time for measurement.
Also, for example, as shown in Non-Patent Document 2, the air permeability was evaluated from the value of current flowing between dissimilar metals using an instrument such as "corrosion sound" in the past, but now the device is complicated. Is not used.
また、特許文献１に示されるように、土壌中へ圧縮空気を注入する圧縮空気の貯蔵容器と、該容器から流出する空気の流量を調整する空気流量調整弁と、流出した空気量を測定する空気流量計と、流出した空気を土壌中へ注入する空気注入管をフレキシブルな細い空気輸送管で連結した土壌通気性簡易測定装置が提案されており、空気の注入速度を測定することにより土壌の通気性を診断する技術も提案されている。 Also, as shown in Patent Document 1, a storage container of compressed air for injecting compressed air into soil, an air flow control valve for adjusting the flow rate of air flowing out of the container, and an amount of air flowed out are measured. A soil permeability simple measuring device has been proposed in which an air flowmeter and an air injection pipe for injecting the discharged air into the soil are connected by a flexible thin air transportation pipe, and the soil injection rate is measured to measure the soil injection rate. Techniques for diagnosing air permeability have also been proposed.
しかし、前記従来技術における含水能Ｗｐによる通気性評価では、土壌試料を採取して試験室で試料の含水率Ｗおよび飽和含水率Ｗｓを測定し、その比率（Ｗｐ＝Ｗ／Ｗｓ×１００）を求めるものであるから、測定に時間を要するなどの問題があった。
また、前記従来技術における「コロージョンサウンド」法によれば、異種金属間に流れるマクロセル電流値から通気性を評価するもので、金属マグネシウムおよび炭素鋼を土壌中に埋設し、それらの異種金属間に流れる電流の大小によって土壌の通気性を評価していたが、電流測定回路が複雑なために費用が高いことや故障しやすいこと、電流の測定値が安定しないなどの問題があった。
さらに、前記特許文献１で提案される方法では、簡易測定装置といいながらも、圧縮空気の貯蔵容器と、空気流量調整弁と、空気流量計、空気注入管等の大掛かりな装置を必要とし、測定位置が変わるたびに該装置を移動させる必要があるため、実際上の利便性に欠けていた。
However, in the air permeability evaluation by the water ability Wp in the prior art, a soil sample is collected, the water content W and the saturated water content Ws of the sample are measured in a test room, and the ratio (Wp = W / Ws × 100) Since it is what it asks for, there existed a problem of taking time for measurement etc.
In addition, according to the "corrosion sound" method in the prior art, to evaluate air permeability from the macrocell current value flowing between dissimilar metals, metallic magnesium and carbon steel are embedded in the soil, and between those dissimilar metals. Although the air permeability of the soil was evaluated based on the magnitude of the flowing current, there were problems such as high cost and failure due to the complexity of the current measurement circuit, and unstable measurement of the current.
Furthermore, the method proposed in Patent Document 1 requires a large-scale device such as a storage container for compressed air, an air flow control valve, an air flow meter, an air injection pipe, etc., even though it is a simple measurement device, Since it is necessary to move the device every time the measurement position changes, the practical convenience is lacking.
そこで、本発明は、これらの問題を解決するために、複数の金属を測定対象の土壌中に埋設し、それらの自然電位を測定することで、予め実績値から求めておいた基準電位幅と測定した自然電位との関係から、土壌の通気性を迅速にかつ簡易に評価する方法を提供すること、さらに、土壌の通気性を測定する装置を提供することを目的とするものである。 Therefore, in the present invention, in order to solve these problems, a plurality of metals are embedded in the soil to be measured, and their natural potentials are measured to obtain a reference potential width previously obtained from actual values. An object of the present invention is to provide a method for evaluating the aeration of soil quickly and easily from the relationship with the measured natural potential, and to provide an apparatus for measuring the aeration of soil.
本発明は、前記課題を解決し、土壌の通気性を迅速にかつ簡易に評価するための方法であって、土壌中に埋設した普通鋼および金属亜鉛について測定したそれぞれの自然電位を、それぞれの金属の基準電位幅と比較すること、また、その組合せに基づいて、土壌の通気性の良否を評価することを特徴としている。 The present invention is a method for solving the above-mentioned problems and evaluating the aeration of soil rapidly and simply, each of the spontaneous potentials measured for ordinary steel and metallic zinc embedded in the soil. It is characterized by comparing the reference potential width of the metal, and evaluating the quality of the breathability of the soil based on the combination thereof.
すなわち、普通鋼および金属亜鉛を測定対象である土壌中に埋設し、電圧計（デジタルマルチメータ）のマイナス端子を照合電極に、プラス端子を対象金属に接続して、普通鋼と金属亜鉛のそれぞれの自然電位を測定し、一方、予め実績値から求めておいた、通気性の異なる土壌中において各金属が示す自然電位幅の組合せを基準とし、測定した普通鋼と金属亜鉛のそれぞれの自然電位を前記基準電位幅と照合し、測定した自然電位が評価基準を示す基準電位幅のいずれに該当するかによって、埋設土壌の通気性の良否を、複数段階（例えば、「高い」、「中程度」および「低い」という三段階）で評価するものである。
なお、本発明でいう金属亜鉛とは、土壌中に埋設した金属亜鉛の電位を測定するために用いるものであって、金属亜鉛の電位を測定できればよいのであるから、具体的な材料としては、鋼表面に亜鉛をめっきした亜鉛めっき鋼を使用することができる。
また、本発明でいう「実績値」とは、室内実験結果から得られた値および実地測定値に基づいた過去からの蓄積データをいう。
That is, ordinary steel and metallic zinc are buried in the soil to be measured, the negative terminal of the voltmeter (digital multimeter) is connected to the reference electrode, and the positive terminal is connected to the target metal, The natural potential of each of the ordinary steel and metallic zinc was measured based on the combination of the self-potential width of each metal in soils with different air permeability, which was previously determined from actual values. Check the ground potential with the reference potential width, and depending on which of the reference potential widths the measured natural potential corresponds to the evaluation criteria, the breathability of the buried soil can be divided into multiple levels (eg, “high”, “medium” And "low".
In addition, since metallic zinc as used in the present invention is used to measure the potential of metallic zinc embedded in the soil, and it is sufficient if the potential of metallic zinc can be measured, as a specific material, Galvanized steel, in which the steel surface is plated with zinc, can be used.
Moreover, the "actual value" in the present invention refers to accumulated data from the past based on values obtained from indoor experiment results and actual measured values.
また、本発明は、前記通気性評価方法において好適に使用される土壌通気性測定装置に関するものである。
本発明の土壌通気性測定装置は、主として以下の機器（１）〜（３）によって構成される。
（１）杭状プローブ
杭状プローブは、複数の金属、即ち、普通鋼と金属亜鉛、がそれぞれ電気的に独立しており、それぞれの金属からの測定端子を備えており、土壌中に差し込み埋設することで、土壌中における普通鋼と金属亜鉛の自然電位を測定するものである。
（２）照合電極
普通鋼と金属亜鉛の自然電位を測定するための照合電極で、例えば、飽和硫酸銅照合電極、飽和銀塩化銀照合電極などを使用することができる。
（３）電圧計
電圧計は市販のデジタルマルチメータを使用することができ、「直流電圧」を測定する。電圧計のマイナス端子を照合電極へ、プラス端子を埋設金属である普通鋼と金属亜鉛にそれぞれ接続することによって、土壌中に埋設された普通鋼と金属亜鉛の自然電位を測定することができる。
The present invention also relates to a soil air permeability measuring device suitably used in the air permeability evaluation method.
The soil aeration measuring apparatus of the present invention is mainly constituted by the following devices (1) to (3).
(1) Pile-like probe The pile-like probe has a plurality of metals, namely, ordinary steel and metallic zinc, which are electrically independent of each other and equipped with measurement terminals from the respective metals, and are inserted and buried in the soil By doing this, the natural potentials of ordinary steel and metallic zinc in the soil are measured.
(2) Reference electrode A reference electrode for measuring the natural potentials of ordinary steel and metallic zinc, for example, a saturated copper sulfate reference electrode, a saturated silver halide silver reference electrode, etc. can be used.
(3) Voltmeter A voltmeter can use a commercially available digital multimeter, and measures a "DC voltage." By connecting the negative terminal of the voltmeter to the reference electrode and the positive terminal to the common metal, which is the buried metal, and the zinc metal, respectively, it is possible to measure the natural potential of the common steel and the zinc metal buried in the soil.
本発明の前記評価方法および装置によれば、土壌中に埋設した杭状プローブの普通鋼および金属亜鉛の自然電位を測定するという簡単な操作のみで、土壌通気性を迅速かつ簡易に評価することができ、また、杭状プローブであるため土壌中に容易に埋設できることから、非破壊でかつ精度よく簡易に土壌通気性の評価を行うことができるという効果が得られる。 According to the above-mentioned evaluation method and apparatus of the present invention, it is possible to quickly and simply evaluate the soil permeability by only a simple operation of measuring the natural potential of the ordinary steel and metallic zinc of the pile-like probe embedded in the soil. In addition, because it is a pile-like probe, it can be easily buried in the soil, so that it is possible to obtain an effect that the evaluation of soil air permeability can be performed nondestructively and accurately with ease.
本発明について、図面とともに以下に説明する。
なお、本発明では、電位は全て飽和硫酸銅照合電極基準（ＣＳＥ）で示した。
The invention will be described below with the aid of the drawings.
In the present invention, all potentials are indicated by the saturated copper sulfate reference electrode reference (CSE).
土壌通気性評価基準表の策定：
土壌通気性の高低を評価するに当たり、その基準となる評価基準表を予め策定しておく必要がある。
本発明では、例えば、以下に示す方法で評価基準表を予め策定しておくことができる。
まず、普通鋼および亜鉛めっき鋼を種々の性状に調製した土壌に埋設して自然電位を測定することによって、土壌通気性が鋼材電位に及ぼす影響を調べた。
なお、自然電位の測定は、例えば、図１に示す長さ１．１３ｍの杭状プローブを用い、後記実施例と同様な方法で測定した。
試験土壌は、例えば、市販の川砂および屋外で採取した黒ボク土を水道水で含水率が４０％程度とした自然含水状態および地表面に水面が現れるまで含水した冠水状態の２種類の含水条件に調製した。
表１に各土壌での鋼材の自然電位を示す。
Formulation of Soil Permeability Assessment Criteria:
In order to evaluate the level of soil permeability, it is necessary to formulate an evaluation standard table that becomes the standard.
In the present invention, for example, the evaluation standard table can be formulated in advance by the method described below.
First, the influence of soil permeability on the potential of the steel material was investigated by measuring the natural potential by burying the ordinary steel and the galvanized steel in the soil prepared to various properties.
In addition, the measurement of a natural potential was measured by the method similar to a postscript Example using a 1.13 m long pile-shaped probe shown, for example in FIG.
The test soil is, for example, two types of water-containing conditions such as a commercially available river sand and a naturally-water-containing state in which the water content is about 40% with tap water and black and white soil collected outdoors; Prepared.
Table 1 shows the natural potential of the steel material in each soil.
表１から分かるように、自然含水状態では、普通鋼の自然電位は−６６５から−７１５ｍＶ、亜鉛めっき鋼は−１０２０から−１０６１ｍＶの貴な値を示した。
一方で、土壌の空隙に水分が充填し、通気性が低い冠水状態では、普通鋼は−８１２から−８４０ｍＶ、亜鉛めっき鋼は−１１７６から−１１８７ｍＶの卑な値を示した。
したがって、土壌通気性評価用電極の自然電位が普通鋼で−７５０ｍＶおよび亜鉛めっき鋼で−１１００ｍＶを基準値とし、基準値より卑な場合は「通気性：低い」、基準値より貴な場合は、「通気性：中程度」とした。また、土壌が乾燥している場合では土壌中に空隙が多く存在し、水分が少ないため通気性が高く、通気性が中程度の土壌より電位値が貴な値を示すことが考えられる。そこで、普通鋼の自然電位が−６００ｍＶ、亜鉛めっき鋼は−１０００ｍＶより貴な値を示す場合は「通気性：高い」とした。
鋼材の腐食が進行するためには酸素と水が必要であるが、「通気性：低い」の土壌では、酸素の供給性が悪く、腐食は発生しにくいため、安全側の評点１とした。一方で、「通気性：高い」の土壌では酸素の供給性が良いが、水分が少ないため評点２とした。「通気性：中程度」の土壌では酸素の供給性が良く、水分が含まれているため腐食しやすいと考え、危険側の評点３とした。
上記の観点から、表２に示す土壌通気性評価基準表を策定した。
As can be seen from Table 1, in the natural water-containing state, the natural potentials of the ordinary steels showed noble values of -665 to -715 mV and the galvanized steels showed -1020 to -1061 mV.
On the other hand, in the flooded state where moisture is filled in the air gap of the soil and air permeability is low, the ordinary steel showed a shallow value of -812 to -840 mV and the galvanized steel showed -1176 to -1187 mV.
Therefore, the natural potential of the soil air permeability evaluation electrode is based on -750mV for ordinary steel and -1100mV for galvanized steel, and if it is lower than the reference value, "air permeability: lower" or higher than the reference value. , "Breathability: medium". In addition, when the soil is dry, there are many voids in the soil, and the water content is low, so the air permeability is high, and it is considered that the potential value is more noble than the soil having a medium air permeability. Therefore, when the natural potential of the ordinary steel is -600 mV and the galvanized steel shows a value more noble than -1000 mV, it is considered as "breathable: high".
Although oxygen and water are necessary for the progress of corrosion of steel materials, the “air-permeable: low” soil has poor ability to supply oxygen and is unlikely to cause corrosion, so it was rated 1 on the safety side. On the other hand, in the “air-permeable: high” soil, although the supply of oxygen is good, it has a score of 2 because it has little moisture. In the case of "air permeability: medium" soil, the supply of oxygen is good, and it is considered that it is easily corroded because it contains water, and it was rated 3 on the dangerous side.
From the above point of view, the soil permeability evaluation criteria table shown in Table 2 was formulated.
土壌通気性の評価：
本発明の実施例として、土壌通気性を、以下の方法で評価した。
まず、評価する対象土壌Ａ、対象土壌Ｂに、図１に示す、例えば、長さ１．１３ｍの杭状プローブを深さ０．５ｍまで差し込んだ。
杭状プローブの先端側（土壌に埋設する側の端部）には、普通鋼（ＳＳ４００）および亜鉛めっき鋼（ＳＧＰ白管）をそれぞれ電気的に独立するように取り付け、一方、杭状プローブの後端側（地表に出る側の端部）には、杭状プローブを土壌に差し込むための操作ハンドル（ＳＳ４００）を取り付け、また、同じく後端側には、土壌中の普通鋼と亜鉛めっき鋼のそれぞれの自然電位Ｅａｉｒを測定検出するための普通鋼測定端子および亜鉛めっき鋼測定端子を取り付けた。
そして、杭状プローブの先端側を土壌に埋設した状態で、電圧計（図示せず）のマイナス端子を照合電極（図示せず）へ接続し、また、プラス端子を杭状プローブの後端側に設けられた普通鋼と亜鉛めっき鋼のそれぞれの測定端子に接続して、普通鋼と亜鉛めっき鋼のそれぞれの自然電位Ｅａｉｒを測定した。
なお、本発明では、電位は全て飽和硫酸銅照合電極基準（ＣＳＥ）で示したが、飽和銀塩化銀照合電極等の他の照合電極を使用することも勿論可能である。
Assessment of soil breathability:
Soil permeability was evaluated by the following method as an example of the present invention.
First, for example, a 1.13 m long pile-like probe shown in FIG. 1 was inserted to a target soil A to be evaluated and a target soil B to a depth of 0.5 m.
On the tip side of the pile-like probe (end on the side to be buried in the soil), ordinary steel (SS400) and galvanized steel (SGP white pipe) are respectively attached so as to be electrically independent, while Attach the operation handle (SS400) for inserting the pile-like probe into the soil on the rear end side (the end on the surface coming out to the ground), and also on the rear end side, ordinary steel and galvanized steel in the soil An ordinary steel measuring terminal and a galvanized steel measuring terminal were attached to measure and detect the respective self- potential E air of each of.
Then, with the tip end of the piled probe embedded in the soil, connect the negative terminal of a voltmeter (not shown) to the reference electrode (not shown), and the plus terminal on the rear end side of the piled probe The natural potential E air of each of the ordinary steel and the galvanized steel was measured by connecting to the respective measurement terminals of the ordinary steel and the galvanized steel provided in.
In the present invention, all the potentials are indicated by the saturated copper sulfate reference electrode reference (CSE), but it is of course possible to use other reference electrodes such as a saturated silver halide silver reference electrode.
対象土壌Ａについては、普通鋼の自然電位Ｅａｉｒとして「−７２１ｍＶ」、また、亜鉛めっき鋼の自然電位Ｅａｉｒとして「−１０２０ｍＶ」という測定値が得られた。 For the target soil A, a measurement value of "-721 mV" was obtained as the natural potential E air of the ordinary steel, and a measurement value of "-1020 mV" was obtained as the natural potential E air of the galvanized steel.
一方、対象土壌Ｂについは、普通鋼の自然電位Ｅａｉｒとして「−８１３ｍＶ」、また、亜鉛めっき鋼の自然電位Ｅａｉｒとして「−１１７６ｍＶ」という測定値が得られた。 On the other hand, for the target soil B, a measurement value of “−813 mV” was obtained as the natural potential E air of the ordinary steel, and a measurement value of “−1176 mV” was obtained as the natural potential E air of the galvanized steel.
対象土壌Ａ、対象土壌Ｂについて得られた普通鋼と亜鉛めっき鋼のそれぞれの自然電位Ｅａｉｒを、予め作成しておいた表２に示す土壌通気性評価基準表に示される基準電位幅と対比し、自然電位Ｅａｉｒが所定の基準電位幅に入るか否か、および、基準電位幅より大きいか小さいかによって、測定対象である土壌の通気性の良否を三段階で評価した。 The natural potential E air of each of the ordinary steel and the galvanized steel obtained for the target soil A and the target soil B is compared with the reference potential width shown in the soil ventilation evaluation reference table shown in Table 2 prepared in advance. and, whether spontaneous potential E air enters the predetermined reference potential widths, and, depending on whether the reference potential larger or smaller than the width, and the breathable quality of the soil to be measured and evaluated in three stages.
例えば、対象土壌Ａについて測定した普通鋼の自然電位Ｅａｉｒ「−７２１ｍＶ」は、表２における普通鋼の自然電位Ｅａｉｒ「―６００ｍＶ≧Ｅａｉｒ≧−７５０ｍＶ」の範囲にあり、また、対象土壌Ａについて測定した亜鉛めっき鋼の自然電位Ｅａｉｒ「−１０２０ｍＶ」は、表２における亜鉛めっき鋼の自然電位Ｅａｉｒ「―１０００ｍＶ≧Ｅａｉｒ≧−１１００ｍＶ」の範囲であるから、表２の通気性評価基準表によれば、対象土壌Ａについての土壌通気性評価は「中程度」（評点３）と評価される。 For example, the natural potential E air “−721 mV” of the ordinary steel measured for the target soil A is in the range of the natural potential E air “−600 mV EE air −−750 mV” of the ordinary steel in Table 2 The spontaneous potential E air of the galvanized steel measured for A “-1020 mV” is in the range of the spontaneous potential E air “−1000 mV E E air ≦ −1100 mV” of the galvanized steel in Table 2, so the air permeability of Table 2 According to the evaluation criteria table, the soil permeability of the target soil A is evaluated as "medium" (score 3).
また、例えば、対象土壌Ｂについて測定した普通鋼の自然電位Ｅａｉｒ「−８１３ｍＶ」は、表２における普通鋼の自然電位Ｅａｉｒ「Ｅａｉｒ＜−７５０ｍＶ」の範囲にあり、また、対象土壌Ｂについて測定した亜鉛めっき鋼の自然電位Ｅａｉｒ「−１１７６ｍＶ」は、表２における亜鉛めっき鋼の自然電位Ｅａｉｒ「Ｅａｉｒ＜−１１００ｍＶ」の範囲であるから、表２の通気性評価基準表によれば、対象土壌Ｂについての土壌通気性評価は「低い」（評点１）と評価される。 Also, for example, the natural potential E air “−813 mV” of the ordinary steel measured for the target soil B is in the range of the natural potential E air “E air <−750 mV” of the ordinary steel in Table 2, and the target soil B Since the natural potential E air “−1176 mV” of the galvanized steel measured for the range of the natural potential E air “E air <−1100 mV” of the galvanized steel in Table 2 According to the above, the soil permeability of the target soil B is evaluated as "low" (score 1).
前記の対象土壌Ａ、対象土壌Ｂの評価結果において、対象土壌Ａに関する土壌通気性評価は「中程度」（評点３）であって、土壌Ａには酸素の供給性が良く、水分が含まれているため腐食を発生しやすい土壌であるといえる。
一方、対象土壌Ｂに関する土壌通気性評価は「低い」（評点１）であるから、鋼材の腐食が進行するために必要とされる酸素の供給性が悪いため、腐食を発生しにくい土壌であるといえる。
In the evaluation results of the target soil A and the target soil B described above, the soil permeability of the target soil A is "moderate" (score 3), and the soil A has a good supply of oxygen and contains water. It can be said that the soil is susceptible to corrosion.
On the other hand, since the soil permeability evaluation for the target soil B is "low" (score 1), the supply of oxygen required for the progress of the corrosion of the steel material is poor, so the soil is less likely to cause corrosion. It can be said.
前記実施例の記載からも明らかなように、評価対象となる土壌中における普通鋼と亜鉛めっき鋼のそれぞれの自然電位Ｅａｉｒを本発明の通気性測定装置によって測定し、この値を土壌通気性評価基準表に示される基準電位幅と照合・比較することによって、土壌の通気性の良否を迅速かつ簡易に評価することができる。 As apparent from the description of the above examples, the natural potential E air of each of the ordinary steel and the galvanized steel in the soil to be evaluated is measured by the air permeability measuring device of the present invention, and this value is the soil air permeability. By comparing and comparing with the reference potential width shown in the evaluation criteria table, it is possible to quickly and easily evaluate the quality of the breathability of the soil.
鋼材が埋設された土壌の通気性の良否は、例えば、埋設された鋼材の腐食の有無・進展状態等に影響するから、土壌の通気性を把握することは重要であるが、本発明による土壌通気性評価方法および土壌通気性測定装置によれば、土壌の通気性の良否を迅速かつ簡易に評価し得るから、埋設された鋼材の腐食状態を把握するための技術としての利用が期待される。
Since the permeability of the soil in which the steel is embedded affects, for example, the presence or progress of corrosion of the embedded steel, it is important to grasp the permeability of the soil, but the soil according to the present invention is important. According to the air permeability evaluation method and the soil air permeability measurement device, the quality of air permeability of the soil can be quickly and easily evaluated, and therefore, it is expected to be used as a technique for grasping the corrosion state of the embedded steel material .
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