JP2007002321A - Concrete penetrating rust inhibitor - Google Patents
Concrete penetrating rust inhibitor Download PDFInfo
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- JP2007002321A JP2007002321A JP2005186351A JP2005186351A JP2007002321A JP 2007002321 A JP2007002321 A JP 2007002321A JP 2005186351 A JP2005186351 A JP 2005186351A JP 2005186351 A JP2005186351 A JP 2005186351A JP 2007002321 A JP2007002321 A JP 2007002321A
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- concrete
- nitrite
- alkynyloxy group
- rust preventive
- polyalkylene oxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/61—Corrosion inhibitors
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Bridges Or Land Bridges (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
【課題】
鉄筋コンクリート中に深く埋まっている鉄筋鋼材へ十分に到達できるコンクリート浸透性防錆剤を提供する。
【解決手段】
コンクリート浸透性防錆剤は、アルキニルオキシ基含有ポリアルキレンオキサイドが、亜硝酸塩水溶液に含まれているものである。アルキニルオキシ基含有ポリアルキレンオキサイドが０．０１〜１０重量％、亜硝酸塩が１〜４０重量％含まれている。アルキニルオキシ基含有ポリアルキレンオキサイドが、アルキニルオキシ基含有ポリエチレンオキサイドおよび／またはアルキニルオキシ基含有ポリプロピレンオキサイドである。【Task】
Provided is a concrete-permeable rust inhibitor capable of sufficiently reaching a reinforced steel material deeply embedded in reinforced concrete.
[Solution]
The concrete-permeable rust preventive is one in which an alkynyloxy group-containing polyalkylene oxide is contained in a nitrite aqueous solution. The alkynyloxy group-containing polyalkylene oxide is contained in an amount of 0.01 to 10% by weight and nitrite is contained in an amount of 1 to 40% by weight. The alkynyloxy group-containing polyalkylene oxide is an alkynyloxy group-containing polyethylene oxide and / or an alkynyloxy group-containing polypropylene oxide.
Description
本発明は、鉄筋コンクリート建造物の保全や補修をする際に、その中の鉄筋鋼材を防錆するために用いられるコンクリート浸透性防錆剤に関するものである。 The present invention relates to a concrete permeable rust preventive agent used for rust prevention of reinforced steel materials in maintenance and repair of reinforced concrete buildings.
ビルや橋梁のような建造物の骨格は、鉄筋コンクリートでできている。鉄筋コンクリートは、優れた耐性および大きな圧縮強度を持つコンクリートと、大きな引張強度を持つ鉄筋鋼材との長所を併せ持っている。 The skeletons of buildings such as buildings and bridges are made of reinforced concrete. Reinforced concrete combines the advantages of concrete with excellent resistance and high compressive strength, and reinforced steel with high tensile strength.
施工直後のコンクリートは、アルカリ性を示しているうえ、埋込まれている鉄筋鋼材との付着性が良く外気を遮断しているので、鉄筋鋼材を錆びから保護している。 The concrete immediately after the construction shows alkalinity and has good adhesion to the embedded reinforcing steel material and blocks the outside air, thus protecting the reinforcing steel material from rust.
しかし施工後長年経過すると、コンクリートが外気中の炭酸ガスの影響で中性化したり、ひび割れを生じそこから水分等が浸入したりして、鉄筋鋼材が徐々に錆びて朽ちる結果、鉄筋コンクリートが劣化し、建造物の耐性と強度との特性が低下してしまう。 However, after many years have passed since construction, the concrete has become neutral due to the influence of carbon dioxide in the outside air, cracks have been generated, moisture has entered from there, and the reinforced steel has gradually rusted and decayed, resulting in deterioration of the reinforced concrete. The resistance and strength characteristics of the building will deteriorate.
そこで鉄筋コンクリート建造物の保全や補修をするため、その鉄筋鋼材を防錆する防錆剤が鉄筋コンクリート表面に塗布される。防錆剤は、鉄筋コンクリート表面から浸透し、鉄筋鋼材に到達して付着し、錆びの進行を防ぐ。 Therefore, in order to maintain and repair the reinforced concrete structure, a rust preventive agent that rusts the reinforced steel material is applied to the reinforced concrete surface. The rust preventive agent penetrates from the surface of the reinforced concrete, reaches and adheres to the reinforced steel material, and prevents the progress of rust.
このような防錆剤として、例えば特許文献１に、アルキルオキシポリエチレンオキサイドのような非イオン性界面活性剤、スルホコハク酸ジオクチルナトリウム、グリセリンおよび亜硝酸カルシウムを含む浸透型防錆剤が開示されている。また特許文献２に、アルカンスルフォン酸塩、スルホコハク酸ジアルキル塩、亜硝酸カルシウムおよびアルカリ成分を含有する浸透性防錆剤が開示されている。 As such a rust inhibitor, for example, Patent Document 1 discloses a penetrating rust inhibitor containing a nonionic surfactant such as alkyloxypolyethylene oxide, dioctyl sodium sulfosuccinate, glycerin and calcium nitrite. . Patent Document 2 discloses a penetrating rust preventive containing alkane sulfonate, dialkyl sulfosuccinate, calcium nitrite and an alkali component.
鉄筋コンクリート構造物の鉄筋被りは、通常表面から、建築構造物の場合３０ｍｍ、土木構造物の場合５０〜６０ｍｍ、海洋構造物の場合８０ｍｍの位置に、存在する。従来用いられている防錆剤は、亜硝酸カルシウムと界面活性剤との相溶性が不十分であったり、共存するアルカリ成分の所為でスルホコハク酸ジアルキル塩のエステルが加水分解されたりして、コンクリートの深くに埋まっている鉄筋鋼材への十分な浸透性が得られなかった。 Reinforcing bar covering of reinforced concrete structures usually exists at a position of 30 mm for building structures, 50-60 mm for civil engineering structures, and 80 mm for marine structures from the surface. Conventional anti-rust agents are not compatible with calcium nitrite and surfactants, or due to the coexistence of alkaline components, esters of dialkyl sulfosuccinate are hydrolyzed, resulting in concrete Sufficient permeability to the steel bars buried deep in the steel was not obtained.
本発明は前記の課題を解決するためになされたもので、鉄筋コンクリート中に深く埋まっている鉄筋鋼材へ十分に到達できるコンクリート浸透性防錆剤を提供することを目的とする。 The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a concrete-permeable rust inhibitor that can sufficiently reach a reinforced steel material deeply buried in reinforced concrete.
前記の目的を達成するためになされた特許請求の範囲の請求項１に記載の発明は、アルキニルオキシ基含有ポリアルキレンオキサイドが、亜硝酸塩水溶液に含まれていることを特徴とするコンクリート浸透性防錆剤である。 In order to achieve the above object, the invention according to claim 1 is characterized in that the alkynyloxy group-containing polyalkylene oxide is contained in an aqueous nitrite solution. It is a rusting agent.
アルキニルオキシ基含有ポリアルキレンオキサイドは分子内に、疎水基であるアセチレン基と、親水基であるポリアルキレンオキサイド基とを有するエーテル型非イオン性界面活性剤である。このアルキニルオキシ基含有ポリアルキレンオキサイドは、アルカリ中でも安定に存在し、アセチレン基と亜硝酸塩との相溶性が良く、コンクリートへの優れた亜硝酸塩浸透性を発現させる。 The alkynyloxy group-containing polyalkylene oxide is an ether type nonionic surfactant having an acetylene group which is a hydrophobic group and a polyalkylene oxide group which is a hydrophilic group in the molecule. This alkynyloxy group-containing polyalkylene oxide is stably present even in an alkali, has good compatibility between the acetylene group and nitrite, and exhibits excellent nitrite permeability to concrete.
亜硝酸イオンがコンクリートの鉄筋鋼材に付着すると、不動態皮膜を形成して錆を防ぐ。コンクリートへ浸透した亜硝酸イオン濃度が約５００ｐｐｍ以上であると有効に不動態を形成する。このコンクリート浸透性防錆剤を用いると、８０〜１００ｍｍの深さまで十分量の亜硝酸塩を到達させることができる。 When nitrite ions adhere to concrete reinforced steel, a passive film is formed to prevent rust. Passivation is effectively formed when the concentration of nitrite ions penetrating into the concrete is about 500 ppm or more. When this concrete permeable rust preventive is used, a sufficient amount of nitrite can be reached to a depth of 80 to 100 mm.
アルキニルオキシ基含有ポリアルキレンオキサイドは、例えば炭素数８〜２０のアルキニルアルコールにアルキレンオキサイドが付加したもので、数平均分子量４００〜８００のものである。アルキニルアルコールは、アセチレン基を直鎖または分岐鎖の途中に有していても末端に有していてもよく、モノオールであってもポリオールであってもよい。 The alkynyloxy group-containing polyalkylene oxide is, for example, an alkylene oxide added to an alkynyl alcohol having 8 to 20 carbon atoms, and has a number average molecular weight of 400 to 800. The alkynyl alcohol may have an acetylene group in the middle of a straight chain or branched chain, or may have a terminal, and may be a monool or a polyol.
請求項２に記載の発明は、前記アルキニルオキシ基含有ポリアルキレンオキサイドが０．０１〜１０重量％、前記亜硝酸塩が１〜４０重量％含まれていることを特徴とする請求項１に記載のコンクリート浸透性防錆剤である。 The invention according to claim 2 is characterized in that 0.01 to 10% by weight of the alkynyloxy group-containing polyalkylene oxide and 1 to 40% by weight of the nitrite are contained. It is a concrete penetrating rust inhibitor.
この範囲を超えると粘度が大き過ぎてコンクリートに浸透できず、この範囲に満たないと十分量が鉄筋鋼材へ到達できない。前記亜硝酸塩が１０〜３０重量％含まれているとなお好ましい。 If it exceeds this range, the viscosity is too large to penetrate into the concrete, and if it is not less than this range, a sufficient amount cannot reach the reinforced steel material. More preferably, the nitrite is contained in an amount of 10 to 30% by weight.
請求項３に記載の発明は、前記アルキニルオキシ基含有ポリアルキレンオキサイドが、アルキニルオキシ基含有ポリエチレンオキサイドおよび／またはアルキニルオキシ基含有ポリプロピレンオキサイドであることを特徴とする請求項１に記載のコンクリート浸透性防錆剤である。 The invention according to claim 3 is characterized in that the alkynyloxy group-containing polyalkylene oxide is an alkynyloxy group-containing polyethylene oxide and / or an alkynyloxy group-containing polypropylene oxide. It is a rust inhibitor.
請求項４に記載の発明は、前記亜硝酸塩が、亜硝酸カルシウムであることを特徴とする請求項１に記載のコンクリート浸透性防錆剤である。 The invention according to claim 4 is the concrete permeable rust preventive according to claim 1, wherein the nitrite is calcium nitrite.
亜硝酸塩は、亜硝酸カルシウム、亜硝酸ナトリウム、亜硝酸リチウムであってもよいが、中でも亜硝酸カルシウムは、アルキニルオキシ基含有ポリアルキレンオキサイドとの相溶性が最も優れている。また亜硝酸カルシウムは、アルカリ骨材反応を生じる恐れがある亜硝酸ナトリウムや高価な亜硝酸リチウムよりも、安定であるうえ安価である。 The nitrite may be calcium nitrite, sodium nitrite, or lithium nitrite. Among these, calcium nitrite is most compatible with the alkynyloxy group-containing polyalkylene oxide. In addition, calcium nitrite is more stable and less expensive than sodium nitrite and expensive lithium nitrite, which may cause an alkali-aggregate reaction.
請求項５に記載の発明は、ｐＨが最低でも９であることを特徴とする請求項１に記載のコンクリート浸透性防錆剤である。 The invention according to claim 5 is the concrete-permeable rust preventive agent according to claim 1, characterized in that the pH is at least 9.
ｐＨが高いと、鉄筋鋼材がより安定化するので錆びが進行し難くなり、一層優れた防錆性を発現する。ｐＨは、亜硝酸塩の濃度の増減により調整されてもよく、アルカリ試薬の添加により調整されていてもよい。 When the pH is high, the reinforced steel material is further stabilized, so that rust is difficult to proceed, and further excellent rust prevention properties are exhibited. The pH may be adjusted by increasing or decreasing the concentration of nitrite, or may be adjusted by adding an alkali reagent.
請求項６に記載の発明は、アルキルオキシ基含有ポリアルキレンオキサイドが、含まれていることを特徴とする請求項１に記載のコンクリート浸透性防錆剤である。 The invention according to claim 6 is the concrete-permeable rust preventive agent according to claim 1, characterized in that an alkyloxy group-containing polyalkylene oxide is contained.
従来のコンクリート浸透性防錆剤に使用されていたアルキルオキシポリエチレンオキサイドのようなアルキルオキシ基含有ポリアルキレンオキサイドが、本発明の作用を損なわない範囲で、添加されていてもよい。 An alkyloxy group-containing polyalkylene oxide such as an alkyloxypolyethylene oxide that has been used in conventional concrete-permeable rust preventives may be added as long as the effect of the present invention is not impaired.
本発明のコンクリート浸透性防錆剤は、コンクリートへの浸透性が優れているので、深く埋まっている鉄筋鋼材の防錆を確実に行なうことができる。 Since the concrete-permeable rust preventive agent of the present invention has excellent permeability to concrete, it can reliably prevent rusting of deeply reinforced steel materials.
以下、本発明の実施例を詳細に説明するが、本発明の範囲はこれらの実施例に限定されるものではない。 Examples of the present invention will be described in detail below, but the scope of the present invention is not limited to these examples.
コンクリート浸透性防錆剤は、アルキニルオキシ基含有ポリアルキレンオキサイドと、亜硝酸塩水溶液とから得られる。 The concrete-permeable rust inhibitor is obtained from an alkynyloxy group-containing polyalkylene oxide and a nitrite aqueous solution.
本発明を適用するコンクリート浸透性防錆剤を調製し浸透性測定試験を行なった例を実施例１〜３に示し、本発明を適用外のコンクリート浸透性防錆剤を調製し浸透性測定試験を行なった例を比較例１〜３に示す。 Examples 1 to 3 show examples of preparing a concrete-permeable rust preventive agent to which the present invention is applied and conducting a permeability measurement test. The example which performed this is shown to Comparative Examples 1-3.
（実施例１）
アルキニルオキシ基含有ポリアルキレンオキサイドである数平均分子量６６６のポリオキシエチレン２，４，７，９−テトラメチル−５−デシン−４，７−ジオール５重量部を、亜硝酸カルシウム１０重量部と水８５重量部との溶液に加えて攪拌し、コンクリート浸透性防錆剤を得た。そのｐＨは９．８であった。
Example 1
5 parts by weight of polyoxyethylene 2,4,7,9-tetramethyl-5-decyne-4,7-diol having a number average molecular weight of 666, which is an alkynyloxy group-containing polyalkylene oxide, 10 parts by weight of calcium nitrite and water In addition to the solution with 85 parts by weight, the mixture was stirred to obtain a concrete-permeable rust inhibitor. Its pH was 9.8.
下記構成の角柱試験コンクリートを作製し、その上面に８００ｍＬ／ｍ２の割合でコンクリート浸透性防錆剤を塗布し、４５日間放置した。試験コンクリートを割り、上面から所定の深さ毎に、浸透している亜硝酸イオンの濃度を、定量用亜硝酸検出試験紙で比色定量し、浸透性を測定した。深さ即ち浸透距離毎の亜硝酸イオン濃度を表２に示す。
試験コンクリートの構成
幅１００ｍｍ、奥行１００ｍｍ、高さ１５０ｍｍ
単位セメント量：２８０ｋｇ／ｍ３、Ｗ／Ｃ＝６０％、スランプ：１０ｃｍ、空気量：５．０％、粗骨材：ｍａｘ２０ｍｍ、圧縮強度：２６Ｎ／ｍｍ２（材齢２８日）
A prismatic test concrete having the following constitution was prepared, and a concrete permeable rust preventive was applied to the upper surface thereof at a rate of 800 mL / m 2 and left for 45 days. The test concrete was divided, and the concentration of permeated nitrite ions was determined colorimetrically with a nitrite detection test paper for quantification at a predetermined depth from the upper surface, and the permeability was measured. Table 2 shows the nitrite ion concentration at each depth, that is, permeation distance.
Test concrete composition width 100mm, depth 100mm, height 150mm
Unit cement amount: 280 kg / m 3 , W / C = 60%, slump: 10 cm, air amount: 5.0%, coarse aggregate: max 20 mm, compressive strength: 26 N / mm 2 (age 28 days)
（実施例２〜３、比較例１〜３）
表１の組成比としたこと以外は、実施例１と同様にして、コンクリート浸透性防錆剤を得、それの浸透性を測定した。その結果を表２に示す。
(Examples 2-3, Comparative Examples 1-3)
Except having set it as the composition ratio of Table 1, it carried out similarly to Example 1, and obtained the concrete permeable rust preventive agent, and measured the permeable property. The results are shown in Table 2.
表２から明らかな通り、実施例１〜３のコンクリート浸透性防錆剤は、５００ｐｐｍの亜硝酸塩が深さ１２ｃｍまで浸透していたのに対し、比較例１〜３のコンクリート浸透性防錆剤は、５００ｐｐｍの亜硝酸塩がその約半分の深さまでしか浸透していなかった。 As is clear from Table 2, the concrete-permeable rust preventive agents of Examples 1 to 3 were infiltrated with 500 ppm of nitrite to a depth of 12 cm, whereas the concrete-permeable rust preventive agents of Comparative Examples 1 to 3 were used. 500 ppm of nitrite penetrated only about half that depth.
本発明のコンクリート浸透性防錆剤は、老朽化したり劣化したりした鉄筋コンクリート建造物を、保全したり補修したりするために用いられる。 The concrete-permeable rust preventive agent of the present invention is used for maintaining or repairing a reinforced concrete structure that has deteriorated or deteriorated.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| JP2005186351A JP4624193B2 (en) | 2005-06-27 | 2005-06-27 | Concrete penetrating rust inhibitor |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2005186351A JP4624193B2 (en) | 2005-06-27 | 2005-06-27 | Concrete penetrating rust inhibitor |
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| JP2007002321A true JP2007002321A (en) | 2007-01-11 |
| JP4624193B2 JP4624193B2 (en) | 2011-02-02 |
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| JP2005186351A Expired - Fee Related JP4624193B2 (en) | 2005-06-27 | 2005-06-27 | Concrete penetrating rust inhibitor |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0328147A (en) * | 1989-06-14 | 1991-02-06 | W R Grace & Co | Methods of regulating air entrainment in concrete compositions |
| JPH06206753A (en) * | 1993-01-11 | 1994-07-26 | Shin Etsu Chem Co Ltd | Underwater non-separable concrete mix composition and defoaming agent for concrete mix composition |
| JP2002371388A (en) * | 2001-06-14 | 2002-12-26 | Taisei Corp | Infiltration type rust preventive and its construction method |
| JP2005076038A (en) * | 2003-08-29 | 2005-03-24 | I S Kosan Kk | Rust-preventive permeable composition, alkalinity-imparting permeable composition and method for improving durability of concrete structure |
-
2005
- 2005-06-27 JP JP2005186351A patent/JP4624193B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0328147A (en) * | 1989-06-14 | 1991-02-06 | W R Grace & Co | Methods of regulating air entrainment in concrete compositions |
| JPH06206753A (en) * | 1993-01-11 | 1994-07-26 | Shin Etsu Chem Co Ltd | Underwater non-separable concrete mix composition and defoaming agent for concrete mix composition |
| JP2002371388A (en) * | 2001-06-14 | 2002-12-26 | Taisei Corp | Infiltration type rust preventive and its construction method |
| JP2005076038A (en) * | 2003-08-29 | 2005-03-24 | I S Kosan Kk | Rust-preventive permeable composition, alkalinity-imparting permeable composition and method for improving durability of concrete structure |
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| Publication number | Publication date |
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| JP4624193B2 (en) | 2011-02-02 |
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