JP6353733B2 - Spacer member having anti-corrosion function for steel in concrete and installation method thereof - Google Patents
Spacer member having anti-corrosion function for steel in concrete and installation method thereof Download PDFInfo
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- JP6353733B2 JP6353733B2 JP2014158939A JP2014158939A JP6353733B2 JP 6353733 B2 JP6353733 B2 JP 6353733B2 JP 2014158939 A JP2014158939 A JP 2014158939A JP 2014158939 A JP2014158939 A JP 2014158939A JP 6353733 B2 JP6353733 B2 JP 6353733B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 74
- 239000010959 steel Substances 0.000 title claims description 74
- 125000006850 spacer group Chemical group 0.000 title claims description 70
- 239000004567 concrete Substances 0.000 title claims description 66
- 238000000034 method Methods 0.000 title claims description 12
- 238000009434 installation Methods 0.000 title claims description 3
- 238000005260 corrosion Methods 0.000 title description 10
- 239000000463 material Substances 0.000 claims description 54
- 229910052751 metal Inorganic materials 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 27
- 230000003014 reinforcing effect Effects 0.000 claims description 23
- 239000011150 reinforced concrete Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 239000011148 porous material Substances 0.000 claims description 13
- 239000008151 electrolyte solution Substances 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- 239000002683 reaction inhibitor Substances 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 5
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical group [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000009415 formwork Methods 0.000 claims description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 3
- 229910001416 lithium ion Inorganic materials 0.000 claims description 3
- 238000006056 electrooxidation reaction Methods 0.000 claims 1
- 230000002265 prevention Effects 0.000 claims 1
- 230000007797 corrosion Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 239000003513 alkali Substances 0.000 description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- -1 sulfide ions Chemical class 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical class [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000028161 membrane depolarization Effects 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000002336 repolarization Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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- Prevention Of Electric Corrosion (AREA)
Description
本発明は、鉄筋コンクリート構造物を作る際に鉄筋と型枠の間、鉄筋と鉄筋の間、および既存コンクリートと鉄筋の間に所定の空間を保持するための鉄筋コンクリート用スペーサー部材に関するものであって、特に、鉄筋コンクリート構造物の内部に、該鋼材よりも標準電極電位の低い金属よりなるスペーサーブロック部材を含むスペーサー部材を設置し、コンクリート構造物内部の鋼材とスペーサーブロック部材を電気的に接続することにより、コンクリート内部の鋼材の腐食を防止する方法に関するものである。 The present invention relates to a reinforced concrete spacer member for maintaining a predetermined space between a reinforcing bar and a formwork, between a reinforcing bar and a reinforcing bar, and between an existing concrete and a reinforcing bar when making a reinforced concrete structure, In particular, by installing a spacer member including a spacer block member made of a metal having a lower standard electrode potential than the steel material inside the reinforced concrete structure, and electrically connecting the steel material inside the concrete structure and the spacer block member. The present invention relates to a method for preventing corrosion of steel materials inside concrete.
一般に、鉄筋コンクリート構造物は、コンクリートの中に鋼材を埋め込んで、外力に対してコンクリートと、その中の鋼材が一体となって働くものである。 In general, a reinforced concrete structure is a structure in which a steel material is embedded in the concrete, and the concrete and the steel material in the concrete work together against an external force.
よって、鉄筋コンクリート構造物は、内部に埋め込まれた鋼材の配置は重要であり、鉄筋コンクリート用スペーサー部材は、鉄筋に取り付けて、鉄筋と型枠、鉄筋と鉄筋、および鉄筋と既存コンクリートとの距離を所定の長さに保ちコンクリートを打設することにより、健全な鉄筋コンクリート構造物を構築するために用いられる。 Therefore, in the reinforced concrete structure, the arrangement of the steel material embedded inside is important, and the spacer member for the reinforced concrete is attached to the reinforcing bar, and the distance between the reinforcing bar and the formwork, the reinforcing bar and the reinforcing bar, and the reinforcing bar and the existing concrete is determined. It is used to construct a sound reinforced concrete structure by placing concrete with a length of.
さまざまな鉄筋コンクリート構造物に対応するために鉄筋コンクリート用スペーサー部材も目的によって多種多様なものが開発されている。そのような中、鉄筋コンクリート構造物中の鉄筋の位置を保つことに加え、新たな付加価値が求められており、特許文献１，２等が提案されている。
In order to cope with various reinforced concrete structures, various types of spacer members for reinforced concrete have been developed depending on the purpose. Under such circumstances, in addition to maintaining the position of the reinforcing bar in the reinforced concrete structure, new added value is required, and
しかしながら、鉄筋コンクリート用スペーサー部材は、鉄筋と共に、鉄筋コンクリート楮物の内部に設置されるが、近年、鉄筋コンクリート構造物の劣化が大きな課題となっている。 However, although the spacer member for reinforced concrete is installed inside a reinforced concrete case together with the reinforcing bar, in recent years, deterioration of the reinforced concrete structure has become a major issue.
コンクリート構造物の代表的な劣化要因としては、中性化、塩害、凍害、アルカリ骨材反応、化学的侵食、および疲労等を挙げることができる。
このようにコンクリート構造物の耐久性の課題は、コンクリートそのものの耐久性のみでなく、併用する鋼材の耐久性（耐腐食性）の課題であることも多い。
Typical deterioration factors of concrete structures include neutralization, salt damage, frost damage, alkali aggregate reaction, chemical erosion, fatigue, and the like.
As described above, the problem of the durability of the concrete structure is often not only the durability of the concrete itself but also the durability (corrosion resistance) of the steel material used in combination.
コンクリート内の鋼材は、鋼材全体が、強アルカリ性のコンクリートで覆われるため、鋼材表面に不導体被膜を形成し、耐久性（耐腐食性）が向上する。しかしながら、鋼材がスペーサー部材等の強アルカリ性を呈さない材料と接した部分においては、不導体被膜が形成されない。 Since the steel material in concrete is entirely covered with strongly alkaline concrete, a non-conductive film is formed on the steel material surface, and durability (corrosion resistance) is improved. However, a non-conductive film is not formed in the portion where the steel material is in contact with a material that does not exhibit strong alkalinity such as a spacer member.
特に、コンクリート内部の鋼材の腐食は、コンクリートの中性化、コンクリートに含まれる塩分、並びに、外部からコンクリートに浸入してくる塩化物イオン、硫化物イオン、及び窒化物イオンなどの影響で、立地環境によっては比較的短期間で進行する場合がある。 In particular, the corrosion of steel inside concrete is affected by the neutralization of concrete, the salt content of concrete, and the influence of chloride ions, sulfide ions, and nitride ions entering the concrete from the outside. Depending on the environment, it may take a relatively short time.
さらには、前記の理由等により、コンクリート構造物の一部を部分的に補修した場合では、既設部の鋼材がアノード、補修部の鋼材がカソードとなり、新たにマクロセル腐食を生ずる場合がある等の課題があった。 Furthermore, when a part of a concrete structure is partially repaired due to the reasons described above, the steel material of the existing part becomes the anode and the steel material of the repaired part becomes the cathode, which may cause new macrocell corrosion. There was a problem.
本発明は、コンクリート内部の鋼材を確実に防食することが可能となる、スペーサー部材およびその設置方法を提供する。 The present invention provides a spacer member and a method for installing the spacer member, which can surely prevent corrosion of the steel material inside the concrete.
すなわち、本発明は、上記課題を解決するために、以下の手段を採用する。
（１）鉄筋コンクリート内に設置し、コンクリート内の鋼材の位置を適切にするために配置するスペーサー部材において、スペーサーブロック部材を構成する金属が亜鉛アルミニウム合金であり、コンクリート内の鋼材とスペーサーブロック部材を構成する金属が電気的に接続されており、金属の周りに金属表面の不動態被膜の生成を避けるのに充分なｐＨを持った電解質溶液を含有する多孔性材料を付設し、前記多孔性材料に１種類以上のアルカリ・シリカ反応抑制剤が含まれることを特徴とする鋼材のスペーサー部材。
（２）コンクリート内の鋼材とスペーサーブロック部材を構成する金属の電気的接続において、金属部分と接合されたワイヤーを用いる前記（１）の鋼材のスペーサー部材。
（３）前記アルカリ・シリカ反応抑制剤がリチウムイオンを含む前記（１）又は（２）の鋼材のスペーサー部材。
（４）金属部分と接合されたワイヤーをコンクリート内の鋼材に巻き付け、コンクリート内の鋼材とスペーサー部材を固定する前記（１）〜（３）のいずれかの鋼材のスペーサー部材の設置方法。
（５）前記（１）〜（３）のいずれかの鋼材のスペーサー部材をコンクリート内に設置し、電気化学的防食機能を付与してなる、鉄筋と型枠の間、鉄筋と鉄筋の間、および既存コンクリートと鉄筋の間の所定空間の保持方法。
（６）前記（１）〜（３）のいずれかの鋼材のスペーサー部材を設置したコンクリート内の鋼材の自然電位の測定方法であって、コンクリート内の鋼材のスペーサー部材を設置した面と反対側の面を測定点とし、照合電極を用い、自然電位を測定することを特徴とするコンクリート内の鋼材の自然電位の測定方法。
（７）前記（１）〜（３）のいずれかの鋼材のスペーサー部材を設置したコンクリート構造物。
That is, the present invention employs the following means in order to solve the above problems.
(1) In a spacer member that is installed in reinforced concrete and arranged to make the position of the steel material in the concrete appropriate, the metal constituting the spacer block member is a zinc aluminum alloy , and the steel material in the concrete and the spacer block member are A porous material containing an electrolyte solution having a pH sufficient to avoid the formation of a passive film on the metal surface is attached around the metal , and the porous material one or more alkali-silica reaction inhibitor include spacer members steel characterized by Rukoto to.
(2) The steel spacer member according to (1), wherein a wire joined to a metal portion is used in electrical connection between the steel material in the concrete and the metal constituting the spacer block member .
(3) The spacer member of the steel material according to (1) or (2) , wherein the alkali / silica reaction inhibitor contains lithium ions .
(4) The installation method of the spacer member of the steel material in any one of said (1) -(3) which winds the wire joined with the metal part around the steel material in concrete, and fixes the steel material and spacer member in concrete .
(5) The steel spacer member of any one of the above (1) to (3) is installed in concrete, and is provided with an electrochemical anticorrosion function, between the reinforcing bar and the formwork, between the reinforcing bar and the reinforcing bar, And a method for retaining a predetermined space between the existing concrete and the reinforcing bar .
(6) A method for measuring a natural potential of a steel material in a concrete in which the steel spacer member of any one of (1) to (3) is installed, which is opposite to the surface on which the steel spacer member in the concrete is installed. A method for measuring the natural potential of a steel material in concrete, wherein a natural potential is measured using a reference electrode as a measurement point and a reference electrode.
(7) A concrete structure provided with the steel spacer member of any one of (1) to (3) .
本発明の鋼材のスペーサーブロック部材を設置することによって、コンクリート内部の鋼材を確実に防食することが可能となる。 By installing the steel spacer block member of the present invention, it becomes possible to reliably prevent corrosion of the steel inside the concrete.
１：スペーサー部材
２：鋼材（みがき鋼棒）
３：コンクリート
４：照合電極
５：リード線
６：多孔性材料
７：スペーサーブロック部材
1: Spacer member 2: Steel material (polished steel bar)
3: Concrete 4: Reference electrode 5: Lead wire 6: Porous material 7: Spacer block member
以下、本発明を詳細に説明する。
なお、本発明における部や％は特に規定しない限り質量基準で示す。
また、本発明におけるコンクリートとは、モルタルを含む場合もある。
Hereinafter, the present invention will be described in detail.
In the present invention, “parts” and “%” are based on mass unless otherwise specified.
Moreover, the concrete in this invention may contain a mortar.
本発明の鋼材のスペーサー部材は、スペーサーとしての機能のみならず、コンクリート内部の鋼材を陰極とし、コンクリート内部に設置したスペーサーブロック部材を構成する金属を陽極として、両者を電気的に接続することにより、この陰極−陽極間に電気を流し、コンクリート内部の鋼材を防食するものである。
本発明の鋼材のスペーサー部材は、鉄筋と型枠の間、鉄筋と鉄筋の間、および既存コンクリートと鉄筋の間に所定空間を保持する機能を持つ。スペーサー部材の形状や大きさは、保持したい所定空間により任意に調整することが可能であり、特に限定されないが、通常、数ｍｍ〜数１００ｍｍである。
The steel spacer member of the present invention not only functions as a spacer, but also by electrically connecting the steel material inside the concrete as a cathode and the metal constituting the spacer block member installed inside the concrete as an anode. In this case, electricity is passed between the cathode and the anode to prevent corrosion of the steel material inside the concrete.
The steel spacer member of the present invention has a function of maintaining a predetermined space between the reinforcing bar and the formwork, between the reinforcing bar and the reinforcing bar, and between the existing concrete and the reinforcing bar. The shape and size of the spacer member can be arbitrarily adjusted depending on the predetermined space to be held, and are not particularly limited, but are usually several mm to several hundred mm.
本発明の鋼材のスペーサーブロック部材を構成する金属とは、亜鉛、アルミニウム、カドミウム、マグネシウムの内、１種又は２種以上含む合金が挙げられるが、亜鉛アルミニウム合金が好ましい。 The metal constituting the spacer block member of the steel material of the present invention, zinc, aluminum, cadmium, among magnesium, one or but more containing alloy can be mentioned up, zinc aluminum alloy.
本発明の鋼材のスペーサーブロック部材を構成する金属の不動態化を避けるため、金属の周りの全てまたは一部は適当な高いｐＨが維持されなければならない。亜鉛−アルミニウム合金の場合には適当なｐＨ値は１３．３以上であるが、他の材料の場合には、その材料の不動態化を避けるのに十分高いｐＨが必要である。 In order to avoid passivation of the metals that make up the steel spacer block members of the present invention, all or part of the surroundings of the metal must be maintained at a suitably high pH. In the case of a zinc-aluminum alloy, a suitable pH value is 13.3 or higher, but in the case of other materials, a sufficiently high pH is necessary to avoid passivation of the material.
しかしながら、スペーサーブロック部材を構成する金属に付設された多孔性材料に含有する電解質溶液のｐＨが高いため、多孔性材料に隣接するコンクリート部分でアルカリ・シリカ反応が懸念されることから、多孔性材料に含有する電解質溶液に少なくとも１種類のアルカリ・シリカ反応抑制剤の存在することが好ましい。 However, since the pH of the electrolyte solution contained in the porous material attached to the metal constituting the spacer block member is high, there is a concern about the alkali-silica reaction in the concrete portion adjacent to the porous material. It is preferable that at least one alkali / silica reaction inhibitor is present in the electrolyte solution contained.
アルカリ・シリカ反応抑制剤は、電解質溶液のｐＨの低下を抑制するためにはリチウムイオンが好ましく、水酸化リチウムの形態で添加することがさらに好ましい。 The alkali / silica reaction inhibitor is preferably lithium ion in order to suppress a decrease in pH of the electrolyte solution, and more preferably added in the form of lithium hydroxide.
鋼材とスペーサーブロック部材を電気的に接続する方法は、スペーサーブロック部材を構成する金属と鋼材が電気的に導通されていればよく特に限定されるものではないが、鉄等の金属線の一部を金属内に埋め込み、埋め込まれていない部分を、鋼材等に巻き付ける方法が実用上簡便である。 The method of electrically connecting the steel material and the spacer block member is not particularly limited as long as the metal constituting the spacer block member and the steel material are electrically connected to each other. However, a part of the metal wire such as iron is used. It is practically simple to wrap the metal in a metal and wrap the unembedded portion around a steel material or the like.
本発明では、コンクリート構造物の中に、スペーサー部材を設置し、鋼材とスペーサーブロック部材に電気的な接続を施した後、コンクリートを打設しスペーサー部材を埋め込む形でコンクリート構造物を構築するか、または、スペーサーブロック部材の金属表面を不動態被膜の生成を避けるのに充分なｐＨを持った電解質溶液を含有する多孔性材料で覆った後、スペーサーブロック部材と鋼材を電気的な接続をし、コンクリートを打設し、スペーサー部材を埋め込む形でコンクリート構造物を構築することによって、スペーサーブロック部材と鋼材間に防食電流が流れ、コンクリート内の鋼材が防食される。 In the present invention, a spacer member is installed in the concrete structure, and after the electrical connection is made between the steel material and the spacer block member, the concrete structure is constructed by placing concrete and embedding the spacer member. Alternatively, after covering the metal surface of the spacer block member with a porous material containing an electrolyte solution having a pH sufficient to avoid the formation of a passive film, the spacer block member and the steel material are electrically connected. By constructing the concrete structure by placing concrete and embedding the spacer member, an anticorrosion current flows between the spacer block member and the steel material, and the steel material in the concrete is anticorrosive.
本発明では、自然電位を測定することで、効果を確認することができる。
すなわち、コンクリート内部の鋼材に、それより標準電極電位の低い金属を電気的に接続すると、コンクリート内部の鋼材自体の自然電位が低くなる。そのため、自然電位を測定することで、その数値から、陽極電極層の有効性が判断できる。
自然電位の測定は、コンクリート内部の鋼材のスペーサー部材を設置した面と反対側の面を測定点とし、銅照合電極を用い測定する。このときスペーサーブロック部材と鋼材の接続を切り離せるようにしておき、接続を切り離した直後のインスタントオフ電位と２４時間経過後の電位（２４時間後オフ電位）を測定し、これらの差から復極量を算出する。復極量が大きいほど鋼材を防食する効果が大きい。
In the present invention, the effect can be confirmed by measuring the natural potential.
That is, when a metal having a lower standard electrode potential is electrically connected to the steel material inside the concrete, the natural potential of the steel material itself inside the concrete is lowered. Therefore, the effectiveness of the anode electrode layer can be determined from the numerical value by measuring the natural potential.
The natural potential is measured using a copper reference electrode on the surface opposite to the surface on which the spacer member of the steel material inside the concrete is installed. At this time, the spacer block member and the steel material can be disconnected, and the instant-off potential immediately after disconnecting and the potential after 24 hours (off-potential after 24 hours) are measured. Calculate the amount. The greater the amount of depolarization, the greater the effect of preventing corrosion of steel.
ここで、鉛照合電極により測定した電位Ｅｍ（ｍＶ）は、以下により飽和硫酸銅電極基準の値に換算される。
Ｅcse＝Ｅｍ−８００
Ｅcse ：飽和硫酸銅電極基準換算値鉛（ｍＶ）
Ｅｍ ：照合電極で測定した値（ｍＶ）
復極量（ｍＶ）＝［Ｅio（ｍＶ）］−［Ｅof（ｍＶ）］
Ｅio ：インスタントオフ電位
Ｅof ：２４時間後、オフ電位
Here, the potential Em (mV) measured by the lead verification electrode is converted into a value based on the saturated copper sulfate electrode as follows.
Ecse = Em-800
Ecse: Saturated copper sulfate electrode reference value lead (mV)
Em: Value measured with reference electrode (mV)
Depolarization amount (mV) = [Eio (mV)] − [Eof (mV)]
Eio: Instant off potential Eof: Off potential after 24 hours
以下、本発明の実験例に基づいて、本発明をさらに説明する。なお、実験例１（実施例１）、実験例２（実施例２）は、参考例である。 Hereinafter, the present invention will be further described based on experimental examples of the present invention. Experimental Example 1 (Example 1) and Experimental Example 2 (Example 2) are reference examples.
「実験例１」
図１に実験に用いた試験体の概要を示す。１００×１００×５００ｍｍの直方体のコンクリートの試験体において、亜鉛の周りに金属表面の不動態被膜の生成を避けるのに充分なｐＨを持った電解質溶液を含有する多孔性材料を付設した幅４０ｍｍ×長さ６０ｍｍ×厚さ４０ｍｍスペーサー部材１を直方体の長辺の端部に設置し、１００×１００の面に垂直となるように、長さ４００ｍｍのＤ１９みがき丸鋼２を配置し、成形体を作製した。鋼材およびスペーサーブロック部材からリード線５を配し、鋼材とスペーサーブロック部材の電気的接続は試験体の外で行い、任意にｏｎ−ｏｆｆ動作を出来るようにした。
図２に実験に用いたスペーサー部材１の構成を示す。スペーサーブロック部材７（亜鉛）の周りに、亜鉛表面の不動態被膜の生成を避けるのに充分なｐＨを持った電解質溶液を含有する多孔性材料６を付設した。また、スペーサーブロック部材７と電気的接続されたワイヤーを設置している。
作製した成形体に使用したコンクリート３は、１ｍ３当たり１０ｋｇの塩素イオンを含有させ、鋼材腐食環境下のコンクリート構造物を模したコンクリートの試験体を作製した。
試験体は３日水中、４日乾燥の乾湿繰り返し養生とした。
コンクリート内部のスペーサー部材１を設置した面で鉄筋の中心に相当する点を測定点とし、銅照合電極４を用い測定した。また、インスタントオフ電位と通電を停止してから２４時間後のオフ電位を測定し復極量を算出した。自然電位測定結果を表１に示す（実施例１）。
"Experiment 1"
FIG. 1 shows an outline of the test body used in the experiment. In a 100 × 100 × 500 mm rectangular concrete specimen, a width 40 mm × with a porous material containing an electrolyte solution having a pH sufficient to avoid the formation of a passive film on the metal surface around zinc A spacer member 1 having a length of 60 mm × a thickness of 40 mm is placed at the end of the long side of the rectangular parallelepiped, and a D19 polished
FIG. 2 shows the configuration of the spacer member 1 used in the experiment. Around the spacer block member 7 (zinc), a
The
The test specimen was repeatedly dried and wet for 3 days in water and 4 days.
The point corresponding to the center of the reinforcing bar on the surface where the spacer member 1 inside the concrete was installed was taken as a measurement point, and measurement was performed using the copper reference electrode 4. In addition, the instant off potential and the off potential 24 hours after stopping the energization were measured to calculate the amount of repolarization. The natural potential measurement results are shown in Table 1 (Example 1).
「実験例２」
スペーサーブロック部材７の金属が、亜鉛／アルミニウムの比が１／１である亜鉛アルミニウム合金であること以外は、実験例１と同様の試験体を作製し、測定を行った。自然電位測定結果を表１に示す（実施例２）。
"Experimental example 2"
Except that the metal of the
「実験例３」
アルカリ・シリカ反応抑制剤（ゼオライト系アルカリ・シリカ反応抑制剤（水沢化学工業社製、商品名アルカット））を多孔性材料に含有（質量比で多孔性材料の５％）させたこと以外は、実験例２と同様の試験体を作製し、測定を行った。自然電位測定結果を表１に示す（実施例３）。
"
Except for containing an alkali / silica reaction inhibitor (zeolite alkali / silica reaction inhibitor (manufactured by Mizusawa Chemical Industry Co., Ltd., trade name Arcut)) in the porous material (5% of the porous material by mass ratio) A test specimen similar to that of Experimental Example 2 was produced and measured. The natural potential measurement results are shown in Table 1 (Example 3).
「実験例４」
試験体のスペーサーブロック部材７を取り付けないこと以外は、実験例１と同様の試験体を作製し、測定を行った（比較例１）。自然電位測定結果を表１に示す。
"Experimental example 4"
Except not attaching the
本発明のスペーサーブロック部材を使用することにより、コンクリート構造物の鋼材に、安定で、かつ均質な防食電流を得ることができるので、主に、土木・建築業界等における、海洋構造物や護岸構造物等のコンクリート構造物の高耐久化の用途に適する。 By using the spacer block member of the present invention, a stable and homogeneous anticorrosion current can be obtained for the steel material of the concrete structure. Therefore, mainly in the civil engineering / building industry, etc., marine structures and revetment structures Suitable for high durability use of concrete structures such as objects.
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