JPH03144048A - Reinforcing bar for prestressed concrete - Google Patents
Reinforcing bar for prestressed concreteInfo
- Publication number
- JPH03144048A JPH03144048A JP28420689A JP28420689A JPH03144048A JP H03144048 A JPH03144048 A JP H03144048A JP 28420689 A JP28420689 A JP 28420689A JP 28420689 A JP28420689 A JP 28420689A JP H03144048 A JPH03144048 A JP H03144048A
- Authority
- JP
- Japan
- Prior art keywords
- plating
- concrete
- reinforcing bar
- melting point
- reinforcing bars
- 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.)
- Pending
Links
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 34
- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 17
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 16
- 239000000956 alloy Substances 0.000 claims abstract description 16
- 238000002844 melting Methods 0.000 claims abstract description 12
- 229910052738 indium Inorganic materials 0.000 claims abstract description 6
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 4
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims abstract description 4
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052718 tin Inorganic materials 0.000 claims abstract description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract 3
- 238000007747 plating Methods 0.000 abstract description 39
- 239000004567 concrete Substances 0.000 abstract description 20
- 230000008018 melting Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 6
- 150000002739 metals Chemical class 0.000 abstract description 5
- 238000005496 tempering Methods 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract 2
- 239000000463 material Substances 0.000 description 25
- 238000005336 cracking Methods 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 229910000679 solder Inorganic materials 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000978 Pb alloy Inorganic materials 0.000 description 1
- 229910020220 Pb—Sn Inorganic materials 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- -1 lead (Pb) Chemical class 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Landscapes
- Reinforcement Elements For Buildings (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、プレストレストコンクリート用鉄筋（以下、
ＰＣ用鉄筋という）に係り、より詳細には、コンクリー
トとの密着性、耐応力腐食割れ性に優れたＰＣ用鉄筋に
関する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to reinforcing bars for prestressed concrete (hereinafter referred to as
The present invention relates to reinforcing bars for PC (hereinafter referred to as reinforcing bars for PC), and more specifically relates to reinforcing bars for PC that have excellent adhesion to concrete and stress corrosion cracking resistance.
［従来の技術］
ＰＣ用鉄筋は、通常、鋼棒、鋼線からなり、コンクリー
トに圧縮力を与えるために、あらかじめ引張力が負荷さ
れて使用される。鉄筋に負荷される引張力をコンクリー
トに圧縮力として伝達するためには、鉄筋とコンクリー
トとの密着性が重要である。そこで、密着性を良くする
ために通常の鉄筋は、丸棒ではなく、側面に突起、溝、
くぼみ等の模様が施されたいわゆる異形棒となっている
。[Prior Art] Reinforcing bars for PC are usually made of steel rods and steel wires, and are used after being loaded with tensile force in order to apply compressive force to concrete. In order to transmit the tensile force applied to the reinforcing bars to the concrete as compressive force, the adhesion between the reinforcing bars and concrete is important. Therefore, in order to improve adhesion, ordinary reinforcing bars are not made of round bars, but have protrusions and grooves on the sides.
It is a so-called unusually shaped stick with patterns such as indentations.
ところで、ＰＣ用鉄筋は、圧延放しくａｓｒｏｌｌｅｄ
）の肌（艶面状態）のまま使用されることが多く、その
ためにコンクリートにひびが生じた場合には、そのひび
から浸入する湿気・酸素等により容易に腐食する。また
、鉄筋としてコンクリートに組み込まれる以前の保管中
にも発錆することがある。高い引張力が負荷されたＰＣ
用鉄筋が腐食するといわゆる応力腐食割れを起こす。そ
こで、コンクリートとの密着性を確保し、かつ、１本当
たりのＰＣ用鉄筋への負荷を低減させるために従来は使
用本数を増加させることが行われていた。しかし、使用
本数を増加させるということはコンクリート構造物の高
価格化につながる。By the way, the reinforcing bars for PC are asrolled without being rolled.
) is often used in its glossy state, and if cracks occur in the concrete, it is easily corroded by moisture, oxygen, etc. that seep in through the cracks. Additionally, rust may develop during storage before being incorporated into concrete as reinforcing steel. PC loaded with high tensile force
When reinforcing bars corrode, so-called stress corrosion cracking occurs. Therefore, in order to ensure adhesion to concrete and reduce the load on each PC reinforcing bar, the number of PC reinforcing bars used has conventionally been increased. However, increasing the number of concrete structures used leads to higher prices for concrete structures.
そこで、ＰＣ用鉄筋の耐食性を向上させるために、鋼棒
、鋼線よりなる母材の表面に亜鉛めっき、ニッケルめっ
き、クロムめっき等を施すことが試みられている。Therefore, in order to improve the corrosion resistance of PC reinforcing bars, attempts have been made to apply zinc plating, nickel plating, chromium plating, etc. to the surface of base materials made of steel rods and steel wires.
［発明が解決しようとする課題］
しかし、表面に亜鉛めっき等が施されたＰＣ用鉄筋の場
合、母材とめっき層との間の密着性に問題があった。す
なわち、めっき層に割れが生じたり、めっき層が母材か
ら剥離したりするという問題があった。[Problems to be Solved by the Invention] However, in the case of PC reinforcing bars whose surfaces are galvanized or the like, there is a problem in the adhesion between the base material and the plating layer. That is, there were problems in that the plating layer cracked or the plating layer peeled off from the base material.
また、亜鉛等のめっきの安定する厚さは５μｍ以上が必
要であること、および、めっき表面状態が粗いことから
、コンクリートとの密着性を目的として設けられた突起
、溝、くぼみ等は、亜鉛等のめっきを施すとなくなって
しまい、めっき後には異形形状が失われてしまう。その
ため、コンクリートとの密着性が低下し、コンクリート
への圧縮力の伝達を良好には行い難くなってしまう。In addition, since the stable thickness of zinc plating is required to be at least 5 μm, and the surface condition of the plating is rough, protrusions, grooves, depressions, etc. provided for the purpose of adhesion to concrete should not be coated with zinc. It disappears when plating is applied, and the irregular shape is lost after plating. As a result, the adhesion with the concrete decreases, making it difficult to properly transmit compressive force to the concrete.
さらに、上記のめっきを電気めっきで行った場合には水
素脆化防止のためにヘーキング処理工程という余分の工
程が必要となってしまう。Furthermore, when the above-mentioned plating is performed by electroplating, an extra process called a haking process is required to prevent hydrogen embrittlement.
本発明は、上記の課題に鑑みてなされたものであり、コ
ンクリートとの密着性、耐食性（特に耐応力腐食割れ性
）に優れたｐｃ用鉄筋を提供することを目的とする。The present invention was made in view of the above problems, and an object of the present invention is to provide a reinforcing bar for PC that has excellent adhesion to concrete and corrosion resistance (particularly stress corrosion cracking resistance).
［課題を解決するための手段］
上述の課題を解決するため、本発明によるＰＣ用鉄筋は
、鉛（Ｐｂ）、１（Ｓｎ）、インジウム（Ｉｎ）、ビス
マス（Ｂｉ）等の低融点金属の少なくとも１種を主成分
とする金属または合金を少なくとも１層表面に被覆した
ことを特徴とする。[Means for Solving the Problems] In order to solve the above problems, the reinforcing bars for PC according to the present invention are made of low melting point metals such as lead (Pb), 1 (Sn), indium (In), and bismuth (Bi). It is characterized in that its surface is coated with at least one layer of metal or alloy containing at least one type of metal as a main component.
［作用］
以下に本発明の作用及び詳細な構成を、本発明をなすに
際し得た知見等とともに説明する。[Function] The function and detailed structure of the present invention will be explained below along with the knowledge obtained in making the present invention.
本発明者は、まず、亜鉛めっき等を施した場合に生ずる
めっきの割れ、剥離の原因の探究を行った。The present inventor first investigated the cause of cracking and peeling of the plating that occurs when galvanizing or the like is applied.
この原因としては各種のものが考えられ、本発明者は、
めっき浴（例えば、浴温度、ｐＨ，電流密度等）、めっ
き工程（例えば、脱脂等の前処理）等のめつき条件をつ
ぶさに調査したところ、これらの要因を最適のものに管
理した場合であってもめっきの割れ、剥離が生ずること
がねかつた。There are various possible causes for this, and the inventor has
A thorough investigation of plating conditions such as the plating bath (e.g., bath temperature, pH, current density, etc.) and plating process (e.g., pretreatment such as degreasing) revealed that it was possible to control the plating conditions optimally. No cracking or peeling of the plating would occur.
そこで、本発明者は、めっき材料自体に原因があるので
はないかとの推測を行った。しかし、めっき材料に原因
があるとの確証はなく、また、めっき材料に原因がある
としてもいかなるめっき材料とすればめっきの割れ、剥
離の発生を防止し得るかは全く不明であった。しかも、
めっきの割れ♀１１８１１１の発生を防止し得たとして
も異形形状を失うことなくめっきが可能であるか否かと
いうことも全く不明であった。Therefore, the present inventor speculated that the cause may be the plating material itself. However, there was no evidence that the plating material was the cause, and even if the plating material was the cause, it was completely unclear what kind of plating material could be used to prevent the occurrence of cracking and peeling of the plating. Moreover,
Even if the occurrence of plating cracks ♀118111 could be prevented, it was completely unclear whether plating would be possible without losing the irregular shape.
そこで、本発明者は、各種の実験を重ねたところ、低融
点金属あるいは合金よりなるめっき材料を用いるとめっ
きの割れ、剥離がなくなることを知見した。この理由は
明かではないが、めっき層の割れ、剥離の原因はＰＣ用
鉄筋の母材の変形のために生じ、母材の変形にめっき層
が追随しなし）場合にめっきの割れ、剥離が生ずるもの
と考えられるため、上記の低融点金属あるいは合金は、
塑性流動性に優れており、ｐｃ用鉄筋の母材の伸縮にめ
っきの変形（伸縮）が追随ができることから、めっき面
の割れ、剥離が防止されるもので２よないかと考えられ
る。Accordingly, the inventor of the present invention has conducted various experiments and found that cracking and peeling of the plating can be eliminated by using a plating material made of a low melting point metal or alloy. The reason for this is not clear, but the cause of cracking and peeling of the plating layer is due to the deformation of the base material of the PC reinforcing bar, and when the plating layer does not follow the deformation of the base material, cracking and peeling of the plating occurs The above low melting point metals or alloys are
It has excellent plastic fluidity, and the deformation (expansion and contraction) of the plating can follow the expansion and contraction of the base material of the PC reinforcing bar, so it is thought that cracking and peeling of the plating surface can be prevented.
また、低融点金属あるいは合金は表面が平滑な薄層めっ
き処理が可能となり、また、突起、溝、くぼみ等の形状
が保て、コンクリートとの密着性を低下させることがな
いことも判明した。It has also been found that low melting point metals or alloys can be plated in thin layers with a smooth surface, and that the shapes of protrusions, grooves, depressions, etc. can be maintained without reducing adhesion to concrete.
以上のように、低融点金属または合金をｐｃ用鉄筋表面
に薄く被覆することによって従来のめつきでは得ら〆な
かったＰＣ用鉄筋の耐食性向上を図ることができる。As described above, by thinly coating the surface of the PC reinforcing bar with a low melting point metal or alloy, it is possible to improve the corrosion resistance of the PC reinforcing bar, which could not be achieved by conventional plating.
本発明においてｐｃ用鉄筋表面のめつき層の材料として
低融点金属あるいは合金を使用する。低融点金属あるい
は合金の融点としては３５０℃以下のものが好ましい。In the present invention, a low melting point metal or alloy is used as the material for the plating layer on the surface of the PC reinforcing bar. The melting point of the low melting point metal or alloy is preferably 350°C or lower.
例えば、Ｐｂ、Ｓｎ、Ｐｂ−Ｓｎ合金、Ｉｎ、Ｂｉ、Ｉ
ｎ−Ｓｎ合金、Ｉｎ−Ｐｂ合金、Ｉｎ−Ｂ１合金などを
例としてあげることができる。For example, Pb, Sn, Pb-Sn alloy, In, Bi, I
Examples include n-Sn alloy, In-Pb alloy, and In-B1 alloy.
［実施例］ 以下、実施例を説明する。[Example] Examples will be described below.
（実施例１）
線材の両側面に軸方向５ｍｍピッチで設けられたくぼみ
を有するＰＣ用鉄筋母材に、Ｓｎ６０％−Ｐｂ４０％の
共晶はんだを約１０１．ｔｍの厚さで被覆したもの（被
覆材）を製造した。(Example 1) Approximately 10% of Sn 60%-Pb 40% eutectic solder was applied to a PC reinforcing bar base material having depressions provided on both sides of the wire at a pitch of 5 mm in the axial direction. A coating (covering material) with a thickness of tm was manufactured.
なお、ン皮覆は、５ｎ６０％−Ｐｂ４０％の共晶はんだ
の溶湯中に母材を浸漬することにより行った。The coating was performed by immersing the base material in a molten eutectic solder of 5N60%-Pb40%.
この被覆材と裸ｐｃ用鉄筋との大気暴露、塩水噴霧試験
結果を第１表に示す。Table 1 shows the results of atmospheric exposure and salt spray tests of this covering material and bare PC reinforcing bars.
第 １ 表
第１表より、本発明の５ｎ６０％−Ｐｂ４０％の共晶は
んだ材は１００時間の塩水噴霧試験でも発錆せず、初期
の光沢を保持していることがわかる。Table 1 From Table 1, it can be seen that the 5n60%-Pb40% eutectic solder material of the present invention did not rust even after a 100-hour salt spray test and retained its initial gloss.
また、コンクリートとの密着に影響を及ぼすくぼみは、
はんだが非常に軟らかく、かつ、めっき厚さが約１０μ
ｍと薄いため、くぼみにはんだが溜まることなく初期の
異形状態を維持していた。In addition, the depressions that affect the adhesion with concrete,
The solder is very soft and the plating thickness is approximately 10μ.
Because it was as thin as m, the initial deformed state was maintained without solder accumulating in the recesses.
ＰＣ用鉄筋の母材とめっき層との密着性をみるため、被
覆材の引張試験、曲げ試験を行い、破断後の状態をみた
が、破面および側面のすべてにおいてはんだ部の割れ、
剥離はなく、その密着性は極めて良好であった。In order to check the adhesion between the base material of the PC reinforcing bar and the plating layer, we conducted a tensile test and a bending test on the coating material, and observed the state after fracture.
There was no peeling and the adhesion was extremely good.
（実施例２）
線材の側面にらせん状に刻まれた溝を有するＰＣ用鉄筋
母材にＩｎ５０％−５ｎ５０％合金を約５μｍの厚さで
被覆したものを（被覆材）を製造した。(Example 2) A PC reinforcing bar base material having spiral grooves on the side surface of the wire was coated with an In 50%-5N 50% alloy to a thickness of about 5 μm (coating material).
なお、被覆は、Ｉｎ５０％−５ｎ５０％合金の溶湯中に
母材を浸漬することにより行った。The coating was performed by immersing the base material in a molten metal of 50% In-50% In.
この被覆材と裸ＰＣ用鉄筋との大気基π、塩水噴霧試験
の結果を第２表に示す。Table 2 shows the results of the atmospheric base π and salt water spray tests on this coating material and bare PC reinforcing bars.
第２表
第２表より、本発明のＩｎ５０％−５ｎ５０％合金は１
００時間の塩水噴霧試験でも初期の金属光沢を有してお
り、錆の発生はみられなかった。Table 2 From Table 2, the In50%-5N50% alloy of the present invention is 1
Even in the 00 hour salt water spray test, it had an initial metallic luster and no rust was observed.
また、Ｉ ｎ５０％−５ｎ５０％合金は塑性流動性が良
いため、らせん状の溝へのまわりこみも良く、初期の異
形状態を維持していた。In addition, since the In50%-5N50% alloy had good plastic fluidity, it could easily wrap around the spiral grooves and maintain its initial deformed state.
ＰＣ用鉄筋の母材とめつき層との密着性をみるため、被
覆材の引張試験、曲げ試験を行ない、破断後の状態をみ
たが、破面及び側面のすべてにおいてはんだ部の割れ、
剥離はなく、その密着性は極めて良好であった。In order to check the adhesion between the base material of the PC reinforcing bar and the plating layer, we conducted a tensile test and a bending test on the sheathing material, and observed the state after fracture.
There was no peeling and the adhesion was extremely good.
［発明の効果］
以上述べたように、本発明によれば、コンクリートとの
密着性及び耐食性に優れたｐｃ用鉄筋を提供することが
できる。本発明のＰＣ用鉄筋は今後ますます高強度化を
要求されるコンクリート構造物に適用できる。[Effects of the Invention] As described above, according to the present invention, it is possible to provide reinforcing bars for PC that have excellent adhesion to concrete and excellent corrosion resistance. The PC reinforcing bars of the present invention can be applied to concrete structures that will require increasingly higher strength in the future.
なお、低融点金属または合金の被覆を溶融めっきにより
行う場合、めっき時の熱を利用することにより、焼き戻
し工程を省略することが考えられ、
製品の低価格化が期待できる。In addition, when coating with a low-melting point metal or alloy by hot-dip plating, it is possible to omit the tempering process by utilizing the heat during plating, which can be expected to reduce the price of the product.
Claims (1)
ビスマス（Ｂｉ）等の低融点金属の少なくとも１種を主
成分とする金属または合金を少なくとも１層表面に被覆
したことを特徴とするプレストレストコンクリート用鉄
筋。(1) Lead (Pb), tin (Sn), indium (In),
A reinforcing bar for prestressed concrete, the surface of which is coated with at least one layer of a metal or alloy whose main component is at least one low-melting point metal such as bismuth (Bi).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28420689A JPH03144048A (en) | 1989-10-31 | 1989-10-31 | Reinforcing bar for prestressed concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28420689A JPH03144048A (en) | 1989-10-31 | 1989-10-31 | Reinforcing bar for prestressed concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03144048A true JPH03144048A (en) | 1991-06-19 |
Family
ID=17675537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28420689A Pending JPH03144048A (en) | 1989-10-31 | 1989-10-31 | Reinforcing bar for prestressed concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03144048A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011246737A (en) * | 2010-05-24 | 2011-12-08 | Nippon Telegr & Teleph Corp <Ntt> | Composite material |
| WO2019001872A1 (en) * | 2017-06-29 | 2019-01-03 | Nv Bekaert Sa | Pre-stressed concrete structure with galvanized reinforcement |
-
1989
- 1989-10-31 JP JP28420689A patent/JPH03144048A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011246737A (en) * | 2010-05-24 | 2011-12-08 | Nippon Telegr & Teleph Corp <Ntt> | Composite material |
| WO2019001872A1 (en) * | 2017-06-29 | 2019-01-03 | Nv Bekaert Sa | Pre-stressed concrete structure with galvanized reinforcement |
| US10753095B2 (en) | 2017-06-29 | 2020-08-25 | Nv Bekaert Sa | Pre-stressed concrete structure with galvanized reinforcement |
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