JP3930841B2 - Reinforcing bar with highly anti-adhesive coating and method for producing the same - Google Patents

Reinforcing bar with highly anti-adhesive coating and method for producing the same Download PDF

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JP3930841B2
JP3930841B2 JP2003304077A JP2003304077A JP3930841B2 JP 3930841 B2 JP3930841 B2 JP 3930841B2 JP 2003304077 A JP2003304077 A JP 2003304077A JP 2003304077 A JP2003304077 A JP 2003304077A JP 3930841 B2 JP3930841 B2 JP 3930841B2
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coating
anticorrosion
reinforcing bar
powder
anticorrosion coating
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JP2005066574A (en
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照彦 杉本
陸太 村上
祥晃 澤井
裕喜 新井
香 新井
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Takenaka Corp
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    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D

Description

本発明は、コンクリートに対する付着性能を高めた防食被膜付き鉄筋材に関するものである。   The present invention relates to a reinforcing bar material with an anticorrosion coating with improved adhesion performance to concrete.

土木学会 コンクリート・ライブラリー第58号 「エポキシ樹脂塗装鉄筋を用いる鉄筋コンクリートの設計施工指針(案)」 第19頁Japan Society of Civil Engineers Concrete Library No.58 “Guidelines for Design and Construction of Reinforced Concrete Using Epoxy Resin Painted Reinforcement (draft)” Page 19 特公平6−16868号公報Japanese Patent Publication No. 6-16868 特開2001−90254号公報JP 2001-90254 A 特開2001−146567号公報JP 2001-146567 A

近年、コンクリートの骨材等の影響もあって、鉄筋の腐食が進み、いろいろな事故が多発して、問題になっている。そのため、特許文献1などに見られるように、加熱した鉄筋材の表面に、エポキシ粉体塗料を吹き付けて溶融付着させることにより、防食被膜を形成したエポキシ塗装鉄筋が開発され、これにより、防食被膜に不可避的に発生するピンホールの問題を除けば、鉄筋の腐食の問題は一応解決されたようである。   In recent years, corrosion of reinforcing bars has progressed due to the influence of concrete aggregates and the like, and various accidents occur frequently, which has become a problem. Therefore, as can be seen in Patent Document 1 and the like, an epoxy-coated reinforcing bar in which an anticorrosion coating is formed by spraying an epoxy powder coating on the surface of the heated reinforcing bar material to be melted and adhered has been developed. The problem of rebar corrosion seems to have been solved, except for the pinhole problem that inevitably occurs.

しかしながら、非特許文献1に見られるように、鉄筋にエポキシ塗装すると、コンクリートに対する長期の付着力が、無塗装鉄筋とコンクリートとの値の80%程度にまで低下することが知られている。これは、コンクリート構造物の強度に重大な影響を及ぼし、その寿命にも係わる重大な問題である。   However, as can be seen in Non-Patent Document 1, it is known that when epoxy coating is applied to reinforcing bars, long-term adhesion to concrete is reduced to about 80% of the value of uncoated reinforcing bars and concrete. This has a significant effect on the strength of the concrete structure and is a serious problem with regard to its life.

特許文献2に記載の発明は、このような問題を解決するために提案されたもので、合成樹脂粉体塗料(具体的には、熱可塑性ポリエチレンイソフタレートテレフタレート共重合体)を用いて防食被膜を形成した鉄筋材において、防食被膜表面に、珪砂、アルミナ粉末のようなセラミック粉末、ガラス粉末等の無機粒状物を吹き付けて、コンクリートに対する付着性能を高めた点に特徴がある。   The invention described in Patent Document 2 has been proposed in order to solve such a problem, and an anticorrosion coating using a synthetic resin powder coating (specifically, a thermoplastic polyethylene isophthalate terephthalate copolymer). In the reinforcing bar material formed with the above, the surface of the anticorrosion coating is characterized by spraying inorganic particulates such as silica sand, ceramic powder such as alumina powder, glass powder, etc. to improve the adhesion performance to concrete.

この従来例を、図4に基づいて説明すると、次の通りである。先ず、図4の(A)に示すように、鉄筋材41にショットブラストを行って、鉄筋材41の表面の錆や汚れを落とすと共に、鉄筋材41の表面を荒らして粗面にする。しかる後、図4の(B)に示すように、鉄筋材41を加熱し、図4の(C)に示すように、所定の温度(260〜400℃)になった鉄筋材41の表面に、合成樹脂粉体塗料44を吹き付けて、溶融付着させる。そして、図4の(D)に示すように、合成樹脂粉体塗料44が溶融状態にある間に、無機粒状物40aを吹き付け、冷却の工程を経て、図4の(E)に示すように、防食被膜42の表面に無機粒状物40aが固着された高付着防食被膜付き鉄筋材を得るのである。   This conventional example will be described with reference to FIG. First, as shown in FIG. 4A, shot blasting is performed on the reinforcing bar 41 to remove rust and dirt on the surface of the reinforcing bar 41 and to roughen the surface of the reinforcing bar 41 to make it rough. Thereafter, as shown in FIG. 4B, the reinforcing bar 41 is heated, and as shown in FIG. 4C, the surface of the reinforcing bar 41 having a predetermined temperature (260 to 400 ° C.) is applied. Then, the synthetic resin powder coating 44 is sprayed to melt and adhere. Then, as shown in FIG. 4D, while the synthetic resin powder coating 44 is in a molten state, the inorganic particulate matter 40a is sprayed and subjected to a cooling process, as shown in FIG. In this way, a rebar material with a highly adhered anticorrosion coating in which the inorganic particulate matter 40a is fixed to the surface of the anticorrosion coating 42 is obtained.

この従来例によれば、合成樹脂粉体塗料44が溶融状態にある間に無機粒状物40aを吹き付けることによって、無機粒状物40aの一部分が防食被膜42に埋まって当該防食被膜42に固定され、他の部分は防食被膜42上に露出して無数の突起(凹凸)を形成することになり、防食被膜付き鉄筋材であるにもかかわらず、コンクリートに対する付着性能が改善されることになる。   According to this conventional example, by spraying the inorganic particulate matter 40a while the synthetic resin powder coating 44 is in a molten state, a part of the inorganic particulate matter 40a is buried in the anticorrosion coating 42 and fixed to the anticorrosion coating 42, The other portions are exposed on the anticorrosion coating 42 to form innumerable protrusions (irregularities), and the adhesion performance to the concrete is improved in spite of the reinforcing bars with the anticorrosion coating.

しかしながら、この従来例では、防食被膜42の表面に素材の違うものを接着していることになるので、無機粒状物40aの一部が防食被膜42に押し込まれた状態に接着されているとはいえ、他物との当接によって無機粒状物40aが剥がれ落ちる可能性が大きく、防食被膜42の経年的な劣化により付着性能が著しく低下することが想定される。   However, in this conventional example, since different materials are bonded to the surface of the anticorrosion coating 42, it is said that a part of the inorganic particulates 40a is bonded to the anticorrosion coating 42. No, there is a high possibility that the inorganic granular material 40a is peeled off due to contact with other objects, and it is assumed that the adhesion performance is remarkably lowered due to the deterioration of the anticorrosion coating 42 over time.

また、加熱した鉄筋材41にエポキシ粉体塗料等の合成樹脂粉体塗料44を吹き付けて、溶融接着し、防食被膜42を形成する場合、一般的に、鉄筋材1メートルあたり数個のピンホール(極小の気泡)が不可避的に生じるので、全製品について、全長にわたってピンホール検査を行い、ピンホールの個数が許容値以下であることを確認した上で、工場出荷されているのが実情であるが、上記の従来例では、1層の防食被膜42を形成し、その表面に無機粒状物40aを吹き付けているので、1層の防食被膜42に生じたピンホールがそのまま防食性能上の弱点として残ることになる。   In addition, when a synthetic resin powder coating 44 such as an epoxy powder coating is sprayed on the heated reinforcing bar material 41 and melt-bonded to form the anticorrosion coating 42, generally several pinholes per 1 m of the reinforcing bar material are used. (Very small bubbles) are inevitably generated, so pinhole inspection is performed on the entire length of all products, and it is confirmed that the number of pinholes is less than the allowable value before shipping to the factory. However, in the above-mentioned conventional example, since one layer of the anticorrosion coating 42 is formed and the inorganic granular material 40a is sprayed on the surface thereof, the pinhole generated in the one layer of the anticorrosion coating 42 is a weak point in the anticorrosion performance as it is. Will remain as.

尚、特許文献3には、コンクリートに対する鉄筋材の付着力を高める技術ではないが、鋼材の防錆塗料として、従来の溶剤型ジンクリッチペイントや亜鉛メッキの性能を上回る無溶剤型ジンクリッチペイント(亜鉛金属末と、バインダー成分としてのエポキシ樹脂及び硬化剤とが混合されて成るジンクリッチ粉体塗料)やそのジンクリッチ粉体塗料を、120〜250℃に加熱した鋼材に粉体静電塗装機等により吹き付けて防食被膜を形成する技術が記載されている。   Patent Document 3 does not disclose a technique for increasing the adhesion of reinforcing steel to concrete, but as a rust-proof paint for steel, it does not include conventional solvent-type zinc rich paint or solvent-free zinc rich paint ( Zinc metal powder, zinc-rich powder paint made by mixing epoxy resin and hardener as binder component) and zinc-rich powder paint on steel material heated to 120-250 ° C. A technique for forming an anticorrosion film by spraying with a method such as the above is described.

本発明は、上記の事柄に留意してなされたもので、その目的とするところは、粉体塗料の吹き付けにより、鉄筋材の表面に上下2層の防食被膜を形成して、防食被膜に不可避的に発生するピンホールの問題を解決すると同時に、2層目の防食被膜により無数の突起を形成して、コンクリートとの付着力を高めることができる高付着防食被膜付き鉄筋材を提供することにある。   The present invention has been made in consideration of the above-mentioned matters. The purpose of the present invention is to form a two-layered upper and lower anti-corrosion coating on the surface of the reinforcing bar material by spraying a powder coating material, so that the anti-corrosion coating is inevitable. To provide a highly reinforcing anticorrosive coating-coated reinforcing bar that can increase the adhesion to concrete by forming numerous countless protrusions with the second anticorrosive coating and simultaneously solving the problem of pinholes that occur is there.

上記の目的を達成するために、本発明が講じた技術的手段は、次のとおりである。即ち、本発明による高付着防食被膜付き鉄筋材は、鉄筋材の表面に、エポキシ粉体塗料による第一防食被膜を形成し、第一防食被膜の上に、亜鉛金属末とエポキシ樹脂及び硬化剤とが混合されて成る粉体塗料による第二防食被膜を形成し、第二防食被膜によって形成された無数の突起によりコンクリートに対する付着力を高めたことを特徴としている(請求項1)。
In order to achieve the above object, technical measures taken by the present invention are as follows. That is, the reinforcing bar with a highly adhered anticorrosive coating according to the present invention is formed on the surface of the reinforcing bar with the first anticorrosive coating by the epoxy powder coating, and on the first anticorrosive coating, the zinc metal powder , the epoxy resin, and the curing agent. The second anticorrosion film is formed by a powder coating formed by mixing the two, and the adhesiveness to the concrete is enhanced by innumerable protrusions formed by the second anticorrosion film (claim 1).

本発明による高付着防食被膜付き鉄筋材の製造方法は、鉄筋材を加熱し、鉄筋材の表面温度が250〜390℃にある間に、当該鉄筋材に、エポキシ粉体塗料を吹き付けて溶融付着させることにより第一防食被膜を形成すると共に、この温度条件下で、溶融状態にある第一防食被膜の表面に、亜鉛金属末と、バインダー成分であるエポキシ樹脂及び硬化剤とが混合されて成るジンクリッチ粉体塗料を吹き付けて溶融付着させることにより第二防食被膜を形成し、しかる後、第一,第二防食被膜付き鉄筋材を冷却することにより、第二防食被膜によって形成された無数の突起を有する高付着防食被膜付き鉄筋材を製造することを特徴としている(請求項)。
According to the present invention, a method of manufacturing a reinforcing bar material with a high adhesion anticorrosive coating heats the reinforcing bar material, and sprays an epoxy powder coating onto the reinforcing bar material while the surface temperature of the reinforcing bar material is 250 to 390 ° C. The first anticorrosive film is formed by mixing the zinc metal powder, the epoxy resin as the binder component, and the curing agent on the surface of the first anticorrosive film in a molten state. The zinc-rich powder coating is sprayed and melted to form the second anticorrosion coating, and then the first and second anticorrosion coating reinforcing bars are cooled, and the countless number formed by the second anticorrosion coating A highly reinforcing anticorrosive coated reinforcing bar material having protrusions is produced (claim 2 ).

本発明の高付着防食被膜付き鉄筋材によれば、1層目の第一防食被膜にピンホールが生じても、溶融状態にある第一防食被膜の上に第二防食被膜を形成することで、第一防食被膜のピンホールが修復されることになる。たとえピンホールが修復されずに残っても、第一防食被膜のピンホールと第二防食被膜のピンホールとが合致する確率は殆どゼロであるから、第一防食被膜のピンホールに起因する防食性能上の弱点が第二防食被膜でカバーされ、第二防食被膜のピンホールに起因する防食性能上の弱点が第一防食被膜でカバーされる結果、高い防食性能を確保できるのである。   According to the reinforcing material with a high adhesion anticorrosive film of the present invention, even if pinholes are generated in the first anticorrosive film of the first layer, the second anticorrosive film is formed on the first anticorrosive film in a molten state. The pinhole of the first anticorrosion coating is repaired. Even if the pinhole remains unrepaired, the probability that the pinhole of the first anticorrosion coating and the pinhole of the second anticorrosion coating match is almost zero, so the anticorrosion caused by the pinhole of the first anticorrosion coating The weak point on performance is covered with the second anticorrosion coating, and the weak point on the anticorrosion performance due to the pinhole of the second anticorrosion coating is covered with the first anticorrosion coating. As a result, high anticorrosion performance can be secured.

それでいて、エポキシ粉体塗料による第一防食被膜の上に、亜鉛金属末とエポキシ樹脂及び硬化剤とが混合されて成る粉体塗料による第二防食被膜を形成し、第二防食被膜によって形成された無数の突起によりコンクリートに対する付着力を高めるので、防食被膜の表面に別の粒状物を接着して突起を形成する場合のように、他物との当接等によって突起が剥がれ落ちる虞がなくなり、長年月にわたって高い付着性能を確保できることになる。
Still, a second anticorrosion film made of a powder paint in which zinc metal powder , an epoxy resin and a curing agent are mixed is formed on the first anticorrosion film made of the epoxy powder paint, and formed by the second anticorrosion film. Since the adhesion to concrete is increased by countless protrusions, there is no risk of protrusions coming off due to contact with other objects, as in the case of forming protrusions by adhering another granular material to the surface of the anticorrosion coating, High adhesion performance can be secured over many years.

本発明による高付着防食被膜付き鉄筋材の製造方法によれば、請求項1に記載の高付着防食被膜付き鉄筋材を製造できる。即ち、鉄筋材を、特許文献3に見られるようなジンクリッチ粉体塗料の一般的な焼付け温度(120〜250℃)よりも高温である250〜390℃に加熱し、この高温条件下で、エポキシ粉体塗料を吹き付けて第一防食被膜を形成するだけでなく、引き続いて、これと同じ高温条件下で、溶融状態にある第一防食被膜の表面に、亜鉛金属末と、バインダー成分であるエポキシ樹脂及び硬化剤とが混合されて成
ジンクリッチ粉体塗料を吹き付けて第二防食被膜を形成するので、粉体塗料のバインダー成分(エポキシ樹脂と硬化剤)が、一般的な粉体塗装の場合よりも軟化して、粘性が十分に低下することにより、粉体塗料の固形成分である亜鉛金属末が局部的に浮き上がり、バインダー成分でコーティングされた状態の強固な突起が発現することになる。また、第一防食被膜と第二防食被膜は、溶融状態で付着することから、一層の被膜と同様な性質を示しており、第一,第二防食被膜間で剥離することがない。
According to the method for manufacturing a reinforcing bar with a highly adhered anticorrosive coating according to the present invention, the reinforcing bar with a highly adhered anticorrosive coating according to claim 1 can be manufactured. That is, the reinforcing bar material is heated to 250 to 390 ° C., which is higher than the general baking temperature (120 to 250 ° C.) of the zinc rich powder paint as seen in Patent Document 3, and under this high temperature condition, In addition to spraying an epoxy powder coating to form a first anticorrosion coating, subsequently, zinc metal powder and a binder component are formed on the surface of the first anticorrosion coating in a molten state under the same high temperature conditions. since forming the second corrosion protective coating by spraying zinc rich powder paint epoxy resin and a curing agent and is formed by mixing the binder component of the powder coating (epoxy resin and curing agent), common powder coating softened than for, by the viscosity decreases sufficiently, zinc metal powder is a solid component of the powder coating is lifted locally, rigid protrusions in a state of being coated with the binder component be expressed It will be. In addition, since the first anticorrosion coating and the second anticorrosion coating are adhered in a molten state, they exhibit the same properties as a single layer coating and do not peel between the first and second anticorrosion coatings.

尚、250℃以下では、バインダー成分の粘性が高すぎるため、第二防食被膜に突起が発現せず、390℃以上ではバインダー成分の粘性が低すぎて、粉体塗料の固形成分である亜鉛金属末が第二防食被膜の表面に露出し、バインダー成分でコーティングされた状態の突起が発現しない。換言すれば、剥がれ難い強固な突起を形成できない。
In addition, since the viscosity of the binder component is too high at 250 ° C. or lower, no protrusion appears in the second anticorrosive film, and at 390 ° C. or higher, the viscosity of the binder component is too low, and the zinc metal which is a solid component of the powder coating material The powder is exposed on the surface of the second anticorrosion coating, and the protrusions coated with the binder component do not appear. In other words, it is impossible to form a strong protrusion that is difficult to peel off.

このように、第一防食被膜の上に第二防食被膜を形成することで、防食被膜に不可避的に発生するピンホールの問題を解決できるのみならず、250〜390℃という高温条件下で、亜鉛金属末を含んだジンクリッチ粉体塗料を吹き付けて、第二防食被膜自体に突起を発現させるので、突起の剥がれ落ちる虞がなくて、高い付着性能を確保できる高付着防食被膜付き鉄筋材が製造できるのである。 Thus, by forming the second anticorrosion film on the first anticorrosion film, not only can the problem of pinholes inevitably generated in the anticorrosion film be solved, but also under a high temperature condition of 250 to 390 ° C, Zinc rich powder paint containing zinc metal powder is sprayed to cause protrusions to appear on the second anticorrosion coating itself, so there is no risk of protrusion peeling off, and there is no highly adherent anticorrosion coating rebar with high adhesion performance. It can be manufactured.

以下、本発明の実施形態を、図面を参照しながら説明するが、それによって本発明は限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereby.

図1は、本発明に係る高付着防食被膜付き鉄筋材の一例を示す要部の模式的な断面図、図2は、高付着防食被膜付き鉄筋材とコンクリートCとの付着性能を説明する要部の模式的な断面図である。図1、図2において、1は鉄筋材(例えば、異形鉄筋)であり、その表面1aは、ショットブラストにより荒らされた粗面となっている。2は、鉄筋材1の表面1aに形成されたエポキシ粉体塗料による第一防食被膜、3は、第一防食被膜2の上に形成されたジンクリッチ粉体塗料による第二防食被膜であり、第一防食被膜2自体で形成された無数の突起3aを有し、これらの突起3aがコンクリートCに食い込むことによって、コンクリートCと強固(無塗装鉄筋の場合よりも強固)に付着するように構成されている。   FIG. 1 is a schematic cross-sectional view of a main part showing an example of a reinforcing bar with a highly adherent anticorrosive coating according to the present invention, and FIG. 2 is a key for explaining the adhesion performance between a reinforcing bar with a highly adherent anticorrosive coating and concrete C. It is typical sectional drawing of a part. 1 and 2, reference numeral 1 denotes a reinforcing bar material (for example, deformed reinforcing bar), and its surface 1a is a rough surface roughened by shot blasting. 2 is a first anticorrosion coating with an epoxy powder coating formed on the surface 1a of the reinforcing bar 1, 3 is a second anticorrosion coating with a zinc rich powder coating formed on the first anticorrosion coating 2, It has innumerable protrusions 3a formed by the first anticorrosion coating 2 itself, and these protrusions 3a bite into the concrete C so that they adhere firmly to the concrete C (stronger than in the case of unpainted reinforcing bars). Has been.

ジンクリッチ粉体塗料は、固形成分である亜鉛金属末とバインダー成分であるエポキシ樹脂及び硬化剤とが混合されて成る無溶剤型の粉体塗料であり、亜鉛金属末とエポキシ樹脂及び硬化剤との配合割合は、例えば亜鉛金属末86重量%、エポキシ樹脂及び硬化剤14重量%に設定される。3aは、第二防食被膜3によって形成された無数の突起であり、ジンクリッチ粉体塗料の固形成分である亜鉛金属末がジンクリッチ粉体塗料のバインダー成分であるエポキシ樹脂及び硬化剤でコーティングされた状態となっている。   Zinc rich powder coating is a solventless powder coating in which zinc metal powder, which is a solid component, and epoxy resin, which is a binder component, and a curing agent are mixed. The blending ratio is set to 86% by weight of zinc metal powder, 14% by weight of epoxy resin and curing agent, for example. 3a is an infinite number of protrusions formed by the second anticorrosive coating 3, and zinc metal powder, which is a solid component of the zinc rich powder coating, is coated with an epoxy resin and a curing agent, which are binder components of the zinc rich powder coating. It is in the state.

次に、上記の高付着防食被膜付き鉄筋材の製造方法を、図3に基づいて説明する。先ず、図3の(A)に示すように、鉄筋材1にショットブラストを行って、鉄筋材1の表面1aの錆や汚れを落とすと共に、鉄筋材1の表面1aを荒らし、粗面にする。   Next, the manufacturing method of said rebar with a highly adherent anticorrosion coating will be described with reference to FIG. First, as shown in FIG. 3A, shot blasting is performed on the reinforcing bar material 1 to remove rust and dirt on the surface 1a of the reinforcing bar material 1, and the surface 1a of the reinforcing bar material 1 is roughened and roughened. .

しかる後、図3の(B)に示すように、鉄筋材1を既知の加熱手段によって250〜390℃に加熱する。   After that, as shown in FIG. 3B, the reinforcing bar 1 is heated to 250 to 390 ° C. by a known heating means.

次いで、図3の(C)に示すように、250〜390℃に加熱された鉄筋材1の表面1aに、エポキシ粉体塗料4を吹き付けて、溶融付着させ、図3の(D)に示すように、厚さ150〜200μmの第一防食被膜2を形成する。   Next, as shown in FIG. 3C, the epoxy powder coating material 4 is sprayed on the surface 1a of the reinforcing bar 1 heated to 250 to 390 ° C. to be melt-adhered, and shown in FIG. As described above, the first anticorrosive film 2 having a thickness of 150 to 200 μm is formed.

そして、同じ温度条件下(250〜390℃)で、溶融状態にある第一防食被膜2の表面に、固形成分としての亜鉛金属末aが86重量%、バインダー成分としてのエポキシ樹脂b及び硬化剤cが14重量%に設定されたジンクリッチ粉体塗料5を吹き付けて溶融付着させることにより、第二防食被膜3を形成し、しかる後、第一,第二防食被膜付き鉄筋材を冷却して、図3の(E)に示すように、第二防食被膜3によって形成された無数の突起3aを有する高付着防食被膜付き鉄筋材を製造する。   And on the surface of the 1st anti-corrosion coating 2 in a molten state on the same temperature conditions (250-390 degreeC), the zinc metal powder a as a solid component is 86 weight%, the epoxy resin b as a binder component, and a hardening | curing agent. The second anticorrosive coating 3 is formed by spraying the zinc rich powder coating 5 in which c is set to 14% by weight to be melted and adhered, and then the first and second anticorrosion coating reinforcing bars are cooled. As shown in FIG. 3E, a reinforcing bar material with a highly adhered anticorrosion coating having innumerable protrusions 3a formed by the second anticorrosion coating 3 is manufactured.

上記の製造方法によれば、鉄筋材1を、特許文献3に見られるようなジンクリッチ粉体塗料の一般的な焼付け温度(120〜250℃)よりも高温である250〜390℃に加熱し、この高温条件下で、エポキシ粉体塗料4を吹き付けて第一防食被膜2を形成するだけでなく、この高温条件下(250〜390℃)で、溶融状態にある第一防食被膜2の表面に、ジンクリッチ粉体塗料5を吹き付けて第二防食被膜3を形成するので、ジンクリッチ粉体塗料5のバインダー成分(エポキシ樹脂bと硬化剤c)が、ジンクリッチ粉体塗料を用いた一般的な粉体塗装の場合よりも軟化して、粘性が低下することにより、ジンクリッチ粉体塗料5の固形成分である亜鉛金属末aが局部的に浮き上がり、バインダー成分でコーティングされた状態の強固な突起3aが発現することになる。   According to the above manufacturing method, the reinforcing bar 1 is heated to 250 to 390 ° C., which is higher than the general baking temperature (120 to 250 ° C.) of the zinc rich powder coating as shown in Patent Document 3. The surface of the first anticorrosion coating 2 in a molten state is not only formed by spraying the epoxy powder coating 4 under the high temperature conditions to form the first anticorrosion coating 2 but also under the high temperature conditions (250 to 390 ° C.). In addition, since the second anticorrosive coating 3 is formed by spraying the zinc rich powder coating 5, the binder component (epoxy resin b and the curing agent c) of the zinc rich powder coating 5 is a general one using a zinc rich powder coating. As a result of softening and lowering of viscosity than in the case of typical powder coating, the zinc metal powder a which is a solid component of the zinc rich powder coating 5 is locally lifted and is firmly coated with the binder component. So that the protrusions (3a) are expressed.

このように、250〜390℃といった高温の条件下で、溶融状態にある第一防食被膜2の上に、ジンクリッチ粉体塗料5を吹き付けて第二防食被膜3を形成するので、第二防食被膜3自体に突起3aを発現させることができ、突起3aの剥がれ落ちる虞がなくなるので、高い付着性能を確保できるのである。   In this way, the second anticorrosion coating 3 is formed by spraying the zinc rich powder coating 5 on the first anticorrosion coating 2 in a molten state under a high temperature condition of 250 to 390 ° C. Therefore, the second anticorrosion coating 3 is formed. Since the protrusion 3a can be developed on the coating 3 itself, and there is no possibility that the protrusion 3a peels off, high adhesion performance can be ensured.

また、溶融状態にある第一防食被膜2の上に、ジンクリッチ粉体塗料5を吹き付けて第二防食被膜3を形成するので、1層目の第一防食被膜2にピンホールが生じても、その上に第二防食被膜3を形成することで、第一防食被膜2のピンホールが修復されることになり、たとえピンホールが修復されずに残っても、第一防食被膜2のピンホールと第二防食被膜3のピンホールとが合致する確率は殆どゼロであるから、第一防食被膜2のピンホールに起因する防食性能上の弱点が第二防食被膜3でカバーされ、第二防食被膜3のピンホールに起因する防食性能上の弱点が第一防食被膜2でカバーされることになり、その結果として、高い防食性能を確保できるのである。   In addition, since the second anticorrosion coating 3 is formed by spraying the zinc rich powder paint 5 on the first anticorrosion coating 2 in the molten state, even if a pinhole occurs in the first anticorrosion coating 2 of the first layer. By forming the second anticorrosion coating 3 on the pinhole of the first anticorrosion coating 2, the pinhole of the first anticorrosion coating 2 is restored, even if the pinhole remains unrepaired. Since the probability that the hole and the pinhole of the second anticorrosion coating 3 match is almost zero, the second anticorrosion coating 3 covers the weak point in the anticorrosion performance due to the pinhole of the first anticorrosion coating 2, The weak point in the anticorrosion performance resulting from the pinhole of the anticorrosion coating 3 is covered by the first anticorrosion coating 2, and as a result, high anticorrosion performance can be ensured.

因みに、上記の方法によって製造されたD25(mm)の高付着防食被膜付き鉄筋材とD25(mm)の無塗装鉄筋とを供試体として、引抜き試験による鉄筋とコンクリートとの付着強度試験を行ったところ、次の結果を得た。尚、試験方法は、土木学会基準「JSCE−G503引抜き試験による鉄筋とコンクリートとの付着強度試験方法」に準拠し、自由端のすべり量が0.002D=0.05mmにおける付着応力度を求めた。付着応力度は次式によって求めた。   By the way, D25 (mm) rebar with anti-corrosion coating and D25 (mm) uncoated rebar manufactured by the above method were used as test specimens, and a bond strength test between the rebar and concrete was conducted by a pull-out test. However, the following results were obtained. The test method was in accordance with the Japan Society of Civil Engineers standard "JSCE-G503 pullout test adhesion strength test method for reinforcing steel and concrete", and the degree of adhesion stress when the free end slip was 0.002D = 0.05 mm was obtained. . The degree of adhesion stress was determined by the following equation.

Figure 0003930841
Figure 0003930841

上記の数式において、τ:付着応力度(N/mm
P:引張荷重(N)
D:鉄筋の公称直径(mm)
α:コンクリートの圧縮強度に対する補正係数
In the above formula, τ: degree of adhesion stress (N / mm 2 )
P: Tensile load (N)
D: Nominal diameter of the reinforcing bar (mm)
α: Correction factor for compressive strength of concrete

高付着防食被膜付き鉄筋材の付着強度試験結果を表1に示す。   Table 1 shows the results of the adhesion strength test of the rebar material with a highly adhered anticorrosion coating.

Figure 0003930841
Figure 0003930841

無塗装鉄筋の付着強度試験結果を表2に示す。   Table 2 shows the results of the adhesion strength test for uncoated reinforcing bars.

Figure 0003930841
Figure 0003930841

高付着防食被膜付き鉄筋材の付着応力度−すべり量曲線を表3に示す。   Table 3 shows the adhesion stress-slip amount curve of the rebar with a highly adhered anticorrosion coating.

Figure 0003930841
Figure 0003930841

無塗装鉄筋の付着応力度−すべり量曲線を表4に示す。   Table 4 shows adhesion stress-slip amount curves of unpainted reinforcing bars.

Figure 0003930841
Figure 0003930841

これらの表から、本発明に係る高付着防食被膜付き鉄筋材の長期の付着強度は、エポキシ樹脂塗装鉄筋より付着強度が高い無塗装鉄筋と比較しても、1.5〜2.5倍程度、増大することが分かる。これは長期の付着強度が低下するエポキシ樹脂塗装鉄筋の問題点が完全に解決されていることを意味する。   From these tables, the long-term adhesion strength of the rebar with a highly adherent anticorrosion coating according to the present invention is about 1.5 to 2.5 times, even when compared to uncoated rebar with higher adhesion strength than epoxy resin-coated rebar. It can be seen that it increases. This means that the problem of the epoxy resin-coated reinforcing bar whose long-term adhesion strength is reduced has been completely solved.

また、防食性能について、他の防錆塗装鉄筋との比較したところ、表5に示す結果を得た。尚、表5に示す供試体のうち、塗装被膜鉄筋材Aは本発明方法により製造された高付着防食被膜付き鉄筋材、塗装被膜鉄筋材Bはエポキシ樹脂塗装鉄筋である。   Moreover, when the anticorrosion performance was compared with other anticorrosion coated reinforcing bars, the results shown in Table 5 were obtained. Of the specimens shown in Table 5, the coated coated reinforcing bar A is a reinforcing bar with a highly anticorrosive coating produced by the method of the present invention, and the coated coated reinforcing bar B is an epoxy resin coated reinforcing bar.

Figure 0003930841
Figure 0003930841

本発明に係る高付着防食被膜付き鉄筋材の模式的な断面図である。1 is a schematic cross-sectional view of a reinforcing bar with a highly adherent anticorrosive coating according to the present invention. 要本発明に係る高付着防食被膜付き鉄筋材とコンクリートとの付着性能を説明する模式的な断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is typical sectional drawing explaining the adhesion performance of the reinforcing material with a high adhesion anti-corrosion film concerning this invention, and concrete. 本発明に係る高付着防食被膜付き鉄筋材の製造方法の説明図である。It is explanatory drawing of the manufacturing method of the rebar with a high adhesion anti-corrosion film concerning the present invention. 従来の高付着防食被膜付き鉄筋材の製造方法の説明図である。It is explanatory drawing of the manufacturing method of the conventional rebar material with a highly adhesion anti-corrosion coating.

符号の説明Explanation of symbols

1 鉄筋材
2 第一防食被膜
3 第二防食被膜
3a 突起
1 Rebar material
2 First anticorrosion coating
3 Second anticorrosion coating
3a protrusion

Claims (2)

鉄筋材の表面に、エポキシ粉体塗料による第一防食被膜を形成し、第一防食被膜の表面に、亜鉛金属末とエポキシ樹脂及び硬化剤とが混合されて成る粉体塗料による第二防食被膜を形成して、第二防食被膜によって形成された無数の突起によりコンクリートに対する付着力を高めたことを特徴とする高付着防食被膜付き鉄筋材。 The first anticorrosion film by the epoxy powder coating is formed on the surface of the reinforcing bar material, and the second anticorrosion film by the powder coating in which zinc metal powder , epoxy resin and curing agent are mixed on the surface of the first anticorrosion film. Reinforcing bar material with a high adhesion anticorrosion coating, characterized in that the adhesion to concrete is enhanced by countless protrusions formed by the second anticorrosion coating. 鉄筋材を加熱し、鉄筋材の表面温度が250〜390℃にある間に、当該鉄筋材に、エポキシ粉体塗料を吹き付けて溶融付着させることにより第一防食被膜を形成すると共に、この温度条件下で、溶融状態にある第一防食被膜の表面に、亜鉛金属末と、バインダー成分であるエポキシ樹脂及び硬化剤とが混合されて成るジンクリッチ粉体塗料を吹き付けて溶融付着させることにより第二防食被膜を形成し、しかる後、第一,第二防食被膜付き鉄筋材を冷却することにより、第二防食被膜によって形成された無数の突起を有する高付着防食被膜付き鉄筋材を製造することを特徴とする防食被膜付き鉄筋材の製造方法
While the reinforcing bar material is heated and the surface temperature of the reinforcing bar material is 250 to 390 ° C., the first anticorrosive coating is formed by spraying an epoxy powder paint on the reinforcing bar material to be melted and adhered, and this temperature condition Then, a zinc rich powder coating material in which a zinc metal powder, an epoxy resin as a binder component, and a curing agent are mixed is sprayed on the surface of the first anticorrosive coating in a molten state to melt and adhere to the second. Forming the anticorrosion coating, and then cooling the reinforcing bars with the first and second anticorrosion coatings to produce a highly adherent anticorrosion coating with reinforcing coatings with innumerable protrusions formed by the second anticorrosion coating. The manufacturing method of the reinforcing bar with the anticorrosion film characterized by the above .
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