JPS621343B2 - - Google Patents
Info
- Publication number
- JPS621343B2 JPS621343B2 JP2947380A JP2947380A JPS621343B2 JP S621343 B2 JPS621343 B2 JP S621343B2 JP 2947380 A JP2947380 A JP 2947380A JP 2947380 A JP2947380 A JP 2947380A JP S621343 B2 JPS621343 B2 JP S621343B2
- Authority
- JP
- Japan
- Prior art keywords
- steel
- mortar
- aqueous solution
- calcium hydroxide
- concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000463 material Substances 0.000 claims description 18
- 239000004570 mortar (masonry) Substances 0.000 claims description 18
- 239000007864 aqueous solution Substances 0.000 claims description 15
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 12
- 239000000920 calcium hydroxide Substances 0.000 claims description 12
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 12
- ASOKPJOREAFHNY-UHFFFAOYSA-N 1-Hydroxybenzotriazole Chemical compound C1=CC=C2N(O)N=NC2=C1 ASOKPJOREAFHNY-UHFFFAOYSA-N 0.000 claims description 10
- 239000004567 concrete Substances 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 description 33
- 239000010959 steel Substances 0.000 description 33
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 13
- 239000004568 cement Substances 0.000 description 11
- 239000000835 fiber Substances 0.000 description 10
- 230000002265 prevention Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 150000002826 nitrites Chemical class 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- AZFNGPAYDKGCRB-XCPIVNJJSA-M [(1s,2s)-2-amino-1,2-diphenylethyl]-(4-methylphenyl)sulfonylazanide;chlororuthenium(1+);1-methyl-4-propan-2-ylbenzene Chemical compound [Ru+]Cl.CC(C)C1=CC=C(C)C=C1.C1=CC(C)=CC=C1S(=O)(=O)[N-][C@@H](C=1C=CC=CC=1)[C@@H](N)C1=CC=CC=C1 AZFNGPAYDKGCRB-XCPIVNJJSA-M 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000011210 fiber-reinforced concrete Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 235000010289 potassium nitrite Nutrition 0.000 description 1
- 239000004304 potassium nitrite Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000010414 supernatant solution Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Classifications
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1066—Oxides, Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/14—Nitrogen-containing compounds
- C23F11/149—Heterocyclic compounds containing nitrogen as hetero atom
Description
本発明はコンクリートあるいはモルタルの補強
などに使用される耐食性、密着性にすぐれた鋼材
に関するものである。
コンクリートあるいはモルタルの補強鋼材とし
ては一般に鋼棒、鋼線、鋼網や鋼繊維が用いられ
ている。またこれらの鋼材は製造場所と実際に施
工・使用される場所が距離的に離れていたり、施
工場所が屋外であつたりする場合が多いうえに、
鋼材の製造から使用までに長期間を要するので、
鋼材表面が発錆したまま使用されていた。これら
の鋼材は普通セメントペーストの高アルカリ性の
環境にあつて発錆や腐食しにくい状態が保たれて
いるためそのまま使用することが普通であつた。
しかし鉄筋コンクリートでは一旦ひび割れが起る
と、セメントの中性化の進行や水分の浸入などに
より鋼材の腐食が進行する。また鋼繊維補強コン
クリートやモルタルの場合には鋼繊維が均一に混
入分布しているため表面近傍にも存在し、さらに
一部は表面に露出している。したがつて腐食環境
にさらされやすく、鉄錆が表面に浮き出てくる。
いずれにしてもこのように錆の発生や腐食の進行
はコンクリートあるいはモルタルの耐久性を低下
させ、また商品価値を損うことになる。
従来、コンクリート、モルタル中に埋設する鋼
材は表面処理はほとんどなされていないままに使
用されることが多かつたが、一部の鋼材の防錆方
法としては表面に亜鉛メツキを施こしたり、さら
には亜鉛メツキにエポキシ樹脂などを塗布して使
われている。亜鉛メツキ単独ではセメントに亜鉛
が浸食され水素ガスを発生して、コンクリートの
性質に悪影響を及ぼす。しかしまた亜鉛メツキ表
面に樹脂を塗布する方法は鋼材表面の亜鉛を保護
する効果は認められるが、コスト高となり利用価
値が半減するうえに、樹脂とマトリツクスとなる
コンクリート、モルタルとの密着性が問題とな
る。
他方セメントに亜硝酸カリウムを加えて補強鋼
材を防錆する方法は公知であるが、この亜硝酸塩
類は毒性に問題があり、また防錆性についても水
溶液中や湿潤雰囲気に於いては効果を発揮する
が、亜硝酸塩で処理された鋼材が空気中に暴露さ
れると亜硝酸塩が揮散してゆくため防錆効果は急
速に低下する。
本発明はコンクリートあるいはモルタルに埋設
する鋼材（鋼棒、鋼線、鋼網、鋼繊維や鋼箔）を
亜鉛メツキや更には樹脂などを塗布することな
く、簡便にそして防錆性にすぐれる鋼材を得る方
法として１−ヒドロキシベンゾトリアゾールと、
該化合物に対して当量以上の水酸化カルシウムと
を含有する水溶液によつて表面処理するものであ
る。上記該水溶液に於いて水酸化カルシウムを当
量以上用いる理由は、１−ヒドロキシベンゾトリ
アゾール単独の水溶液は酸性であり、したがつて
これを中和するために水酸化カルシウムを当量以
上添加しアルカリ領域に保つためである。過剰の
水酸化カルシウムの添加によつて水溶液が懸濁し
ても防錆性にはなんら悪影響をきたさない。水酸
化カルシウムはセメント中の一成分であり、また
溶出するCa2+もセメント成分で有益な役割こそ
あれ悪影響を及ぼさない。
コンクリートあるいはモルタルと複合させる補
強鋼材をあらかじめ１−ヒドロキシベンゾトリア
ゾールと、該化合物に対し当量以上の水酸化カル
シウムの水溶液〔例えば１−ヒドロキシベンゾト
リアゾール１％／水酸化カルシウム１％で3.65当
量〕に浸漬するかまたは該水溶液をスプレーし鋼
材に表面処理を施こすことで目的を達することが
できる。
補強鋼材の防錆処理に用いる１−ヒドロキシベ
ンゾトリアゾールとしての濃度としては0.05％〜
２重量％範囲がよく、更に好ましくは0.1％〜１
％の範囲が防錆性及び経済性から望ましい。
本発明による表面処理を施こした補強鋼材をコ
ンクリートあるいはモルタルと複合させることに
より耐食性・密着性にすぐれた効果が得られる。
以下実施例について説明する。
実施例 １
１−ヒドロキシベンゾトリアゾールと、該化合
物に対し1.5倍当量の水酸化カルシウムを加えた
組成の0.7％水溶液に鋼繊維（0.35×0.6×30mm）
を浸漬処理し乾燥した後、セメントを混練した上
澄液（水／セメント＝１：２）に浸し、風乾によ
つて水分を除去した状態で空気中に放置し、防錆
性を調べた。なお比較材として、無処理の鋼繊維
を同じセメント上澄液に浸し、風乾したものを調
べた。結果を第１表に示す。
実施例 ２
１−ヒドロキシベンゾトリアゾールと該化合物
に対し3.65倍当量の水酸化カルシウムを加えた組
成の１％水溶液に鋼繊維を浸漬処理し、その後実
施例１と同様な方法で鋼繊維が空気中に暴露され
た時の防錆性を調べた。比較材は実施例１と同じ
である。結果は第２表に示した。
実施例 ３
１−ヒドロキシベンゾトリアゾールと、該化合
物に対して1.5倍当量の水酸化カルシウムを加え
た組成の１％水溶液に鋼繊維を浸漬処理し乾燥し
た後モルタル（水／セメント／砂＝１：２：４）
に埋込み、28日間水中養生して供試体とした。こ
の供試体を３％NaCl水溶液中に浸漬し所定期間
経過後モルタルに発生したひび割れ状況及び供試
体の付着強度を調べた。また供試体のモルタルを
破砕後鋼繊維を取り出しモルタル内での発錆状態
を調べた。なお比較材として、無処理の鋼繊維を
同様のモルタルに埋込んだものを用いた。結果は
第３表に示す。
実施例 ４
１−ヒドロキシベンゾトリアゾールと該化合物
に対して３倍当量の水酸化カルシウムを加えた組
成の2.5％水溶液に鋼棒を浸漬処理し乾燥した後
モルタル（水／セメント／砂＝１：２：４）に埋
込み水中養生して供試体とした。この供試体を３
％NaCl水溶液中に浸漬しモルタルに発生したひ
び割れ状況及び供試体を破砕後鋼棒を取り出しそ
の発錆面積を調べた。なお比較供試体は無処理の
鋼棒を同様のモルタルに埋込んだものを用いた。
The present invention relates to a steel material with excellent corrosion resistance and adhesion that is used for reinforcing concrete or mortar. Steel rods, steel wires, steel nets, and steel fibers are generally used as reinforcing steel materials for concrete or mortar. In addition, in many cases, these steel materials are manufactured at a distance from the site where they are actually constructed and used, or the construction site is outdoors.
Since it takes a long time from manufacturing to using steel materials,
The steel surface was still used with rust. These steel materials were normally used as they were because they remained resistant to rust and corrosion in the highly alkaline environment of cement paste.
However, once cracks occur in reinforced concrete, corrosion of the steel progresses due to progress in carbonation of cement and infiltration of water. Furthermore, in the case of steel fiber-reinforced concrete or mortar, steel fibers are uniformly mixed and distributed, so they exist near the surface, and some of them are exposed at the surface. Therefore, it is easily exposed to a corrosive environment, and iron rust appears on the surface.
In any case, the occurrence of rust and the progression of corrosion reduce the durability of concrete or mortar, and also impair its commercial value. In the past, steel materials buried in concrete or mortar were often used with almost no surface treatment, but some rust prevention methods for steel materials include galvanizing the surface and is used by coating zinc plating with epoxy resin. If galvanized alone, the zinc will erode into the cement and generate hydrogen gas, which will have a negative effect on the properties of the concrete. However, although the method of applying resin to the galvanized surface is effective in protecting the zinc on the steel surface, it is costly and the utility value is halved, and there are problems with the adhesion between the resin and the concrete and mortar that form the matrix. becomes. On the other hand, there is a known method of adding potassium nitrite to cement to prevent rust from reinforcing steel materials, but these nitrites have toxicity problems, and their rust prevention properties are not effective in aqueous solutions or in humid environments. However, when steel materials treated with nitrites are exposed to the air, the nitrites volatilize and the rust prevention effect rapidly decreases. The present invention enables steel materials (steel rods, steel wires, steel nets, steel fibers, and steel foils) to be buried in concrete or mortar without galvanizing or applying resin, etc. As a method for obtaining 1-hydroxybenzotriazole,
The surface is treated with an aqueous solution containing at least an equivalent amount of calcium hydroxide to the compound. The reason for using an equivalent amount or more of calcium hydroxide in the above aqueous solution is that an aqueous solution of 1-hydroxybenzotriazole alone is acidic, so in order to neutralize it, an equivalent amount or more of calcium hydroxide is added to the alkaline region. This is to preserve it. Even if the aqueous solution becomes suspended due to the addition of excess calcium hydroxide, it does not have any adverse effect on the rust prevention properties. Calcium hydroxide is a component in cement, and eluted Ca 2+ is also a component of cement that plays a beneficial role but does not have any negative effects. The reinforcing steel material to be composited with concrete or mortar is immersed in advance in 1-hydroxybenzotriazole and an aqueous solution of calcium hydroxide in an amount equivalent to or more than that of the compound (for example, 1-hydroxybenzotriazole 1%/calcium hydroxide 1% = 3.65 equivalents). The purpose can be achieved by surface-treating the steel material by spraying the aqueous solution or by spraying the aqueous solution. The concentration of 1-hydroxybenzotriazole used for rust prevention treatment of reinforcing steel materials is 0.05% ~
The range is preferably 2% by weight, more preferably 0.1% to 1% by weight.
% range is desirable from the viewpoint of rust prevention and economy. By combining the reinforcing steel material subjected to the surface treatment according to the present invention with concrete or mortar, excellent effects in corrosion resistance and adhesion can be obtained.
Examples will be described below. Example 1 Steel fibers (0.35 x 0.6 x 30 mm) were added to a 0.7% aqueous solution containing 1-hydroxybenzotriazole and calcium hydroxide in an amount equivalent to 1.5 times that of the compound.
After soaking and drying, the sample was immersed in a supernatant solution (water/cement = 1:2) in which cement was kneaded, water was removed by air drying, and the sample was left in the air to examine rust prevention properties. As a comparative material, untreated steel fibers were immersed in the same cement supernatant and air-dried. The results are shown in Table 1. Example 2 Steel fibers were immersed in a 1% aqueous solution containing 1-hydroxybenzotriazole and calcium hydroxide in an amount equivalent to 3.65 times that of the compound, and then the steel fibers were immersed in air in the same manner as in Example 1. The rust prevention properties were investigated when exposed to. The comparative material is the same as in Example 1. The results are shown in Table 2. Example 3 Steel fibers were immersed in a 1% aqueous solution containing 1-hydroxybenzotriazole and calcium hydroxide in an amount equivalent to 1.5 times that of the compound, dried, and then prepared in mortar (water/cement/sand = 1: 2:4)
The specimen was embedded in water and cured in water for 28 days. This specimen was immersed in a 3% NaCl aqueous solution, and after a predetermined period of time, the cracks that had occurred in the mortar and the adhesive strength of the specimen were examined. In addition, after crushing the mortar of the specimen, steel fibers were taken out and the rusting state within the mortar was examined. As a comparison material, untreated steel fibers embedded in the same mortar were used. The results are shown in Table 3. Example 4 A steel rod was immersed in a 2.5% aqueous solution containing 1-hydroxybenzotriazole and calcium hydroxide in an amount three times the amount of the compound, dried, and then mixed with mortar (water/cement/sand = 1:2). : 4) and cured in water to prepare a specimen. This specimen
% NaCl aqueous solution to examine the cracks that occurred in the mortar, and after crushing the specimen, the steel rod was taken out and its rusted area was examined. The comparison specimen used was an untreated steel rod embedded in the same mortar.
【表】【table】
【表】【table】
【表】【table】
Claims (1)
物に対して当量以上の水酸化カルシウムを含有す
る水溶液で処理したことを特徴とするコンクリー
トあるいはモルタル用補強鋼材。1. A reinforcing steel material for concrete or mortar, which is treated with an aqueous solution containing 1-hydroxybenzotriazole and calcium hydroxide in an amount equivalent to or more than the compound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2947380A JPS56125267A (en) | 1980-03-08 | 1980-03-08 | Reinforcing steel material for concrete or mortar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2947380A JPS56125267A (en) | 1980-03-08 | 1980-03-08 | Reinforcing steel material for concrete or mortar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56125267A JPS56125267A (en) | 1981-10-01 |
| JPS621343B2 true JPS621343B2 (en) | 1987-01-13 |
Family
ID=12277059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2947380A Granted JPS56125267A (en) | 1980-03-08 | 1980-03-08 | Reinforcing steel material for concrete or mortar |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56125267A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6284140U (en) * | 1985-11-15 | 1987-05-29 | ||
| JPS6387747U (en) * | 1986-11-26 | 1988-06-08 | ||
| JPH0422520Y2 (en) * | 1985-07-19 | 1992-05-22 | ||
| JPH0436511Y2 (en) * | 1987-10-13 | 1992-08-28 | ||
| JPH0446355Y2 (en) * | 1985-07-17 | 1992-10-30 |
-
1980
- 1980-03-08 JP JP2947380A patent/JPS56125267A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0446355Y2 (en) * | 1985-07-17 | 1992-10-30 | ||
| JPH0422520Y2 (en) * | 1985-07-19 | 1992-05-22 | ||
| JPS6284140U (en) * | 1985-11-15 | 1987-05-29 | ||
| JPS6387747U (en) * | 1986-11-26 | 1988-06-08 | ||
| JPH0436511Y2 (en) * | 1987-10-13 | 1992-08-28 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56125267A (en) | 1981-10-01 |
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