JPH04317448A - Rust inhibiting method for reinforced concrete - Google Patents
Rust inhibiting method for reinforced concreteInfo
- Publication number
- JPH04317448A JPH04317448A JP10956991A JP10956991A JPH04317448A JP H04317448 A JPH04317448 A JP H04317448A JP 10956991 A JP10956991 A JP 10956991A JP 10956991 A JP10956991 A JP 10956991A JP H04317448 A JPH04317448 A JP H04317448A
- Authority
- JP
- Japan
- Prior art keywords
- nitrite
- reinforced concrete
- composition
- rust
- 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.)
- Granted
Links
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 38
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims description 18
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 37
- 239000000203 mixture Substances 0.000 claims abstract description 34
- 239000011414 polymer cement Substances 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims description 6
- 229910002651 NO3 Inorganic materials 0.000 claims 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 12
- IDNHOWMYUQKKTI-UHFFFAOYSA-M lithium nitrite Chemical compound [Li+].[O-]N=O IDNHOWMYUQKKTI-UHFFFAOYSA-M 0.000 abstract description 10
- 239000004568 cement Substances 0.000 abstract description 7
- 239000006185 dispersion Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 239000004576 sand Substances 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 239000011398 Portland cement Substances 0.000 abstract description 5
- 229920000642 polymer Polymers 0.000 abstract description 5
- 229920003048 styrene butadiene rubber Polymers 0.000 abstract description 5
- 230000003014 reinforcing effect Effects 0.000 description 18
- 239000000243 solution Substances 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 238000007796 conventional method Methods 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 150000002826 nitrites Chemical class 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000002250 progressing effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、既製の鉄筋コンクリ−
ト特に塩分を含む鉄筋コンクリ−トの錆抑止方法に関す
る。[Industrial Field of Application] The present invention applies to ready-made reinforced concrete.
In particular, the present invention relates to a method for inhibiting rust on reinforced concrete containing salt.
【０００２】0002
【従来の技術】鉄筋コンクリ−ト工事を行うさい、塩分
を含む原料（たとえば、海砂）を配合したコンクリ−ト
混練物を用いて打設することがよく行われてきた。そこ
で問題となるのが、硬化後における塩分による鉄筋の腐
食であり、以前よりその防錆あるいは錆抑止手段として
亜硝酸塩が利用されていることはよく知られている。BACKGROUND OF THE INVENTION When carrying out reinforced concrete work, it has been common practice to use a concrete mix mixed with salt-containing raw materials (for example, sea sand). The problem here is corrosion of reinforcing bars due to salt after hardening, and it is well known that nitrites have been used as a rust preventive or rust-inhibiting means.
【０００３】その亜硝酸塩の利用の仕方を大別すると二
つの方法が有り、一つはコンクリ−ト原料を混練するさ
い、適量の亜硝酸塩を混入し成形する方法であり、もう
一つは既製のコンクリ−ト表面に亜硝酸塩処理をし含浸
させる方法である。[0003] There are two ways to use nitrite; one is to mix an appropriate amount of nitrite into concrete when mixing raw materials, and the other is to use ready-made concrete. This method involves treating and impregnating the concrete surface with nitrite.
【０００４】後者の場合、既製コンクリ−ト中に埋設さ
れている鉄筋は既にある程度の錆が発生しているため、
それ以上の錆の進行を抑止し、もってコンクリ−トの強
度その他の特性劣化を防ぐということになる。In the latter case, the reinforcing bars buried in the ready-made concrete have already rusted to some extent, so
This prevents further rust from progressing, thereby preventing deterioration of concrete strength and other properties.
【０００５】たとえば、鉄筋コンクリ−ト表面に亜硝酸
塩、炭酸塩などの無機塩類の水溶液を塗布し含浸させる
という方法である。 さらに改良を加えた方法として
含浸させた亜硝酸塩溶液の飛散を防止するために、前記
塗布後にスチレンブタジエンゴムデイスパ−ジヨン、酢
酸ビニル系エマルジヨンなどの高分子化合物を用いたポ
リマ−セメント組成物を上塗りし硬化させる方法がある
（特開昭６０−２０４６８３）。For example, there is a method of applying an aqueous solution of inorganic salts such as nitrites and carbonates to the surface of reinforced concrete to impregnate it. As a further improved method, in order to prevent the impregnated nitrite solution from scattering, a polymer cement composition using a polymer compound such as styrene-butadiene rubber dispersion or vinyl acetate emulsion is overcoated after the application. There is a method of hardening (Japanese Unexamined Patent Publication No. 60-204683).
【０００６】[0006]
【発明が解決しようとする課題】前記従来方法中、最後
に示した改良方法が優れているが、それでも錆抑止能は
表１にも示すとおり決して十分なものとはいえず、より
一層の錆抑止改良技術の開発が待たれていた。[Problems to be Solved by the Invention] Among the conventional methods described above, the improved method shown last is superior, but as shown in Table 1, the rust inhibiting ability is by no means sufficient, and further rust is caused. Development of improved deterrent technology was awaited.
【０００７】[0007]
【課題を解決するための手段】そこで本発明者らは、亜
硝酸塩を中心に錆の進行抑止について、より効果的な方
法を検討した結果、前記従来法で使用されていたポリマ
−セメント組成物と亜硝酸塩とを組み合わせると、予想
しえない顕著な効果を発揮することを知見して、以下に
詳述する発明を導いた。[Means for Solving the Problems] Therefore, the present inventors investigated a more effective method for inhibiting the progress of rust, mainly using nitrites, and found that the polymer cement composition used in the conventional method was It was discovered that a combination of nitrite and nitrite produces an unexpectedly remarkable effect, leading to the invention detailed below.
【０００８】すなわち本発明の要旨は、既製鉄筋コンク
リ−トに亜硝酸塩溶液を塗布し、含浸させたのち、ポリ
マ−セメント組成物を上塗りする鉄筋コンクリ−トの錆
抑止方法において、該ポリマ−セメント組成物に対して
亜硝酸塩を混合してなる鉄筋コンクリ−トの錆抑止方法
である。[0008] That is, the gist of the present invention is to provide a rust prevention method for reinforced concrete in which a nitrite solution is applied to ready-made reinforced concrete to impregnate it, and then a polymer cement composition is overcoated. This is a method for inhibiting rust in reinforced concrete by mixing nitrite with a composition.
【０００９】以下、本発明を詳細に説明する。本発明は
、硬化した鉄筋コンクリ−ト表面に亜硝酸塩を混合した
ポリマ−セメント組成物を上塗りすることによって、内
蔵する鉄筋表面に亜硝酸塩を作用させ、錆抑止効果を向
上させた点に特徴がある。The present invention will be explained in detail below. The present invention is characterized in that by overcoating the surface of hardened reinforced concrete with a polymer cement composition mixed with nitrite, the nitrite acts on the surface of the built-in reinforcing bars, improving the rust inhibiting effect. be.
【００１０】鉄筋コンクリ−トは設計仕様によって配筋
位置が決められており、したがって各鉄筋と上塗りされ
た亜硝酸塩混合ポリマ−セメント組成物との距離はまち
まちである。 ところで、一般の鉄筋コンクリ−トは
、構造上最外殻（たとえば鉄筋コンクリ−ト柱を断面で
見たとき）に配された鉄筋が強度を保持する上で重要で
あることから、その鉄筋の劣化原因である錆の進行を抑
止しうる位置に該ポリマ−セメント組成物を処置する必
要がある。[0010] In reinforced concrete, the reinforcement positions are determined by design specifications, and therefore the distance between each reinforcing bar and the overcoated nitrite mixed polymer cement composition varies. By the way, in general reinforced concrete, the reinforcing bars placed in the outermost shell (for example, when looking at a cross section of a reinforced concrete column) are important for maintaining strength. It is necessary to treat the polymer cement composition at a location where the progress of rust, which is a cause of deterioration, can be inhibited.
【００１１】つまり鉄筋コンクリ−トのかぶり厚さが問
題となる。 その厚さは概ね２ー３ｃｍであり、本発
明はそのような位置の鉄筋の保護を主な狙いとしたもの
である。もとより最外殻鉄筋より深奥に配された鉄筋で
あっても、適宜ポリマ−セメント組成物に混合する亜硝
酸塩濃度を高めることによって、効果的に抑止できる。[0011] That is, the cover thickness of reinforced concrete becomes a problem. Its thickness is approximately 2-3 cm, and the present invention is primarily aimed at protecting the reinforcing bars at such locations. Even if the reinforcing steel is placed deeper than the outermost reinforcing steel, it can be effectively suppressed by appropriately increasing the concentration of nitrite mixed in the polymer cement composition.
【００１２】また配されている鉄筋の形状も種々である
が、たとえ異形鉄筋が用いられた既製コンクリ−トであ
っても、亜硝酸塩は鉄筋の裏側へ回り込み、鉄筋表面全
体の錆の進行を抑止する。以上については、もとより鉄
筋コンクリ−ト表面に直接塗布・含浸させた亜硝酸塩溶
液も抑止作用を有しているが、その効果を飛躍的に向上
させたのが本発明である。[0012]Although the shapes of the reinforcing bars placed are various, even in ready-made concrete using deformed reinforcing bars, nitrites can get around to the back side of the reinforcing bars and prevent rust from progressing on the entire surface of the reinforcing bars. Deter. Regarding the above, a nitrite solution directly applied to and impregnated on the surface of reinforced concrete also has a deterrent effect, but the present invention dramatically improves this effect.
【００１３】本発明で使用する亜硝酸塩は、慣用のもの
が利用できる。塩としてはリチウム、ナトリウム、カリ
ウム、バリウム、カルシウムなどが挙げられる。 最
も好ましい化合物は亜硝酸リチウムである。[0013] As the nitrite used in the present invention, commonly used nitrites can be used. Examples of salts include lithium, sodium, potassium, barium, and calcium. The most preferred compound is lithium nitrite.
【００１４】上記亜硝酸塩は、後述する亜硝酸塩溶液に
用いる亜硝酸塩との異同は問題ではないが、作業の進捗
からいって同一化合物を採用するのが望ましい。[0014] Although it does not matter whether the above nitrite is the same as the nitrite used in the nitrite solution described later, it is desirable to use the same compound in view of the progress of the work.
【００１５】亜硝酸塩をポリマ−セメント組成物と混合
する方法は、本発明では特に限定しないが、望ましくは
それに使用される水に亜硝酸塩を予め溶解させたのち、
他の原料と混合するとよい。[0015] The method of mixing nitrite with the polymer cement composition is not particularly limited in the present invention, but it is preferable to dissolve the nitrite in the water used therein beforehand, and then
Good to mix with other ingredients.
【００１６】ポリマ−セメント組成物と亜硝酸塩との混
合割合は、本発明では特に限定しないが好ましくは該組
成物に対して亜硝酸塩を１．０重量％以上、特に好まし
くは２ー５重量％である。[0016] The mixing ratio of the polymer cement composition and nitrite is not particularly limited in the present invention, but preferably 1.0% by weight or more, particularly preferably 2-5% by weight of nitrite based on the composition. It is.
【００１７】次にポリマ−セメント組成物について説明
する。この組成物は、原料として慣用のポリマ−、セメ
ント、骨材が採用され、水と混練して製造される。
具体例を挙げれば、ポリマ−としてはスチレンブタジエ
ンゴムデイスパ−ジヨン（ＳＲＢデイスパ−ジヨン）、
酢酸ビニル系エマルジヨン、アクリル樹脂系エマルジヨ
ンなどが、セメントとしてはポルトランドセメント、混
合セメントなどが示される。好ましい組み合わせは、ス
チレンブタジエンゴムデイスパ−ジヨンと普通ポルトラ
ンドセメントである。骨材は多くの場合、川砂やけい砂
が用いられるが本発明でも利用される。 その他本発
明では石灰石粉、けい石粉、パ−ライト、焼成ひる石な
どを必要に応じて混合することもできる。Next, the polymer cement composition will be explained. This composition is manufactured by employing conventional polymers, cement, and aggregates as raw materials and kneading them with water.
To give specific examples, the polymers include styrene butadiene rubber dispersion (SRB dispersion),
Examples of cement include vinyl acetate emulsion and acrylic resin emulsion, and examples of cement include Portland cement and mixed cement. A preferred combination is styrene butadiene rubber dispersion and ordinary Portland cement. River sand or silica sand is often used as the aggregate, and is also used in the present invention. In addition, in the present invention, limestone powder, silica powder, perlite, calcined vermiculite, etc. may be mixed as necessary.
【００１８】それらの配合割合は常法にしたがって行え
ばよく、たとえばセメント基準でいえばポリマ−（固形
分）は０．５ー２５重量％、骨材は５０ー７０重量％、
水は３０ー４０重量％配合するのが好ましい。[0018] The blending ratios thereof may be determined according to a conventional method. For example, based on cement, the polymer (solid content) is 0.5-25% by weight, the aggregate is 50-70% by weight,
It is preferable to mix water in an amount of 30 to 40% by weight.
【００１９】以上の要領でつくられた亜硝酸塩混合ポリ
マ−セメント組成物の上塗りは、鉄筋コンクリ−ト表面
に亜硝酸塩溶液を塗布・含浸させたのちいつ行ってもよ
いが、望ましくは含浸後表乾に至る前に行うのがよい。
そうすれば、鉄筋コンクリ−ト表面が湿潤状態にあ
り、該ポリマ−セメント組成物との接着も良好になり、
混合されている亜硝酸塩の鉄筋コンクリ−トへの拡散も
スム−ズであるので一層好ましい。 なお上塗り方法
は刷毛塗り、吹き付け法など常法にしたがう。Top coating of the nitrite-mixed polymer cement composition prepared in the above manner may be applied at any time after the nitrite solution has been applied and impregnated on the surface of the reinforced concrete, but it is preferable to apply the top coating after the impregnation. It is best to do this before it becomes dry. By doing so, the surface of the reinforced concrete will be in a wet state, and the adhesion with the polymer cement composition will be good.
This is more preferable because the mixed nitrite can diffuse smoothly into the reinforced concrete. The topcoating method can be conventional methods such as brushing or spraying.
【００２０】亜硝酸塩混合ポリマ−セメント組成物の上
塗り厚さは、亜硝酸塩の濃度のほか該鉄筋コンクリ−ト
の用途（たとえば装飾性を要する場合など）をも勘案し
て適宜決めることになるが、塗り欠きの生ずる恐れの無
いようにするには１ｍｍ以上の厚さに上塗りするのがよ
い。 作業の迅速性や経済性を考慮すると２ー５ｍｍ
程度にするのが好ましい。[0020] The thickness of the top coat of the nitrite-mixed polymer cement composition is determined as appropriate, taking into account the concentration of nitrite as well as the intended use of the reinforced concrete (for example, when decorative properties are required). In order to avoid the possibility of incomplete coating, it is preferable to apply an overcoat to a thickness of 1 mm or more. Considering speed of work and economy, 2-5mm.
It is preferable to keep it at a certain level.
【００２１】本発明が対象とする既製の鉄筋コンクリ−
トは、形状、材令、配筋仕様、配合仕様等々特別な限定
はない。Ready-made reinforced concrete targeted by the present invention
There are no special limitations on the shape, material size, reinforcement specifications, mix specifications, etc.
【００２２】本発明は、腐食の大きい塩分を含む鉄筋コ
ンクリ−トの錆の進行抑止に特に有効な方法であるが、
塩分を含まない通常の鉄筋コンクリ−トにあっても中性
化による鉄筋の腐食があり、そのような鉄筋コンクリ−
ト、またかぶりが欠損し鉄筋が露出して錆が発生しやす
い状況にある鉄筋コンクリ−トへの利用も本発明に含ま
れる。 なお後者の場合には露出した鉄筋に前記亜硝
酸塩溶液を塗布後、亜硝酸塩混合ポリマ−セメント組成
物を上塗りしたのち、欠損部分全体を補修用モルタル又
はコンクリ−トを用いて修復するのが好適である。The present invention is a particularly effective method for inhibiting the progress of rust in reinforced concrete containing salt, which is highly corrosive.
Even in normal reinforced concrete that does not contain salt, the reinforcing bars may corrode due to carbonation.
The present invention also includes use in reinforced concrete in which the cover is missing and the reinforcing bars are exposed and rust is likely to occur. In the latter case, it is preferable to apply the nitrite solution to the exposed reinforcing bars, top coat the nitrite mixed polymer cement composition, and then repair the entire defective part using repair mortar or concrete. It is.
【００２３】鉄筋コンクリ−ト表面に直接塗布する亜硝
酸塩溶液は、慣用の方法で調製し、塗布・含浸させる。
一例を挙げれば、前述の亜硝酸塩を水に濃度１０ー
５０％に溶解し、刷毛などを用いて鉄筋コンクリ−ト表
面に亜硝酸塩が１０ー３００ｇ／ｍ２になるように塗布
したのち、しばらく放置して、該溶液を十分に含浸させ
る。 その後は、できれば鉄筋コンクリ−トが表乾状
態に達する前に、上記説明にしたがって亜硝酸塩混合ポ
リマ−セメント組成物を上塗りするのが好ましいのは前
述したとおりである。以下、本発明を実施例に基つ゛い
て説明する。[0023] A nitrite solution to be applied directly to the reinforced concrete surface is prepared, applied and impregnated by a conventional method. For example, the above-mentioned nitrite is dissolved in water to a concentration of 10-50%, and then applied to the reinforced concrete surface using a brush so that the concentration of nitrite is 10-300 g/m2, and then left for a while. to fully impregnate the solution. Thereafter, preferably before the reinforced concrete reaches a surface dry state, it is preferable to apply a topcoat with a nitrite-mixed polymer cement composition according to the above explanation, as described above. The present invention will be explained below based on examples.
【００２４】[0024]
【実施例】亜硝酸塩を混合又はしないポリマ−セメント
組成物をつくり、鉄筋コンクリ−ト表面に上塗りして、
錆の進行抑止効果を判断した。[Example] A polymer cement composition with or without nitrite was prepared and coated on the surface of reinforced concrete.
The effectiveness of inhibiting rust progression was determined.
【００２５】（鉄筋コンクリ−トの製造）普通ポルトラ
ンドセメント、砕石（最大寸法 １０ｍｍ）及び海砂
（絶乾状態においてＮａＣｌ換算で ０．２重量％）
を用い、該セメント３０３ｋｇ／ｍ３、Ｗ／Ｃ＝６０％
、ｓ／ａ＝４８％のコンクリ−ト混練物をつくった。(Manufacture of reinforced concrete) Ordinary Portland cement, crushed stone (maximum size 10 mm) and sea sand (0.2% by weight in terms of NaCl in absolute dry condition)
using the cement 303kg/m3, W/C=60%
, a concrete kneaded material with s/a=48% was prepared.
【００２６】一方、鉄筋はＪＩＳ Ｇ ３１０８「みが
き棒鋼用一般鋼材」に規定された錆の発生していないみ
がき棒鋼（長さ１０×直径１ｃｍ）を準備した。On the other hand, a rust-free polished steel bar (length 10 x diameter 1 cm) specified in JIS G 3108 "General Steel Materials for Polished Steel Bars" was prepared as the reinforcing bar.
【００２７】そのみがき棒鋼２本を、内寸が深さ１０ｃ
ｍ、巾１０ｃｍ、長さ１４ｃｍの型枠の巾方向に、上面
より２．５ｃｍ、鉄筋間隔４ｃｍ、鉄筋と側壁との間が
４ｃｍの位置に配設し、固定した。[0027] The inner dimension of the two polished steel bars is 10cm deep.
It was placed and fixed in the width direction of a formwork with a width of 10 cm and a length of 14 cm, at a distance of 2.5 cm from the top surface, with a reinforcing bar interval of 4 cm, and a distance between the reinforcing bars and the side wall of 4 cm.
【００２８】次いで、その型枠に上記コンクリ−ト混練
物を投入し、振動成形したのち、表面をならしたのち、
湿空中に２４時間放置し、脱型した。[0028] Next, the concrete mixture was poured into the mold, subjected to vibration molding, and the surface was smoothed.
It was left in a humid atmosphere for 24 hours and demolded.
【００２９】得られた成形体はＪＣＩ（日本コンクリ−
ト工学協会）が定めた乾湿繰返し法（７０゜Ｃ、ＲＨ９
８％条件で３日間、１０゜Ｃ、ＲＨ５０％条件で４日間
を１サイクル）に準じて１０サイクル行ない、内蔵する
鉄筋に錆を発生させたのち、成形体上面以外の面をエポ
キシ樹脂でコ−トして、鉄筋コンクリ−ト供試体を多数
製造した。供試体の一を破壊して棒鋼を観察したところ
班点状の錆が随所に見られた。[0029] The obtained molded body was manufactured by JCI (Japan Concrete).
The dry-wet cycle method (70°C, RH9
After conducting 10 cycles (one cycle is 3 days under 8% conditions and 4 days under 10°C and 50% RH conditions) to generate rust on the built-in reinforcing bars, the surfaces other than the top surface of the molded body were coated with epoxy resin. - A large number of reinforced concrete specimens were manufactured. When one of the specimens was destroyed and the steel bar was observed, speckled rust was found everywhere.
【００３０】（亜硝酸リチウム溶液の塗布・含浸）亜硝
酸リチウムを常法にしたがって、亜硝酸リチウム２５％
溶液を調製した。その亜硝酸リチウム溶液を供試体上面
に表１に示す量塗布し、３時間放置して含浸させた。(Coating/impregnation of lithium nitrite solution) Lithium nitrite was mixed with 25% lithium nitrite according to a conventional method.
A solution was prepared. The lithium nitrite solution was applied to the upper surface of the specimen in the amount shown in Table 1, and left to stand for 3 hours to allow impregnation.
【００３１】（亜硝酸リチウム混合ポリマ−セメント組
成物の上塗り）亜硝酸リチウム混合ポリマ−セメント組
成物は、普通ポルトランドセメントに対してスチレンブ
タジエンゴムデイスパ−ジヨン（固形分）１０重量％、
けい砂（粒径０．０２５ー０．２ｍｍ）５８重量％及び
亜硝酸リチウムがポリマ−セメント組成物に対し表１に
示す割合になるように溶解させた水３２重量％配合し、
混練してつくった。(Overcoat of lithium nitrite mixed polymer cement composition) The lithium nitrite mixed polymer cement composition contains 10% by weight of styrene-butadiene rubber dispersion (solid content) based on ordinary Portland cement;
58% by weight of silica sand (particle size 0.025-0.2mm) and 32% by weight of water in which lithium nitrite was dissolved in the ratio shown in Table 1 to the polymer cement composition,
Made by kneading.
【００３２】該組成物を、前述した亜硝酸リチウム溶液
で処理せれた供試体上面に厚さ２ｍｍ及び５ｍｍに上塗
りし、３日間湿空養生（２０゜Ｃ、ＲＨ９０％）した。[0032] The composition was overcoated to a thickness of 2 mm and 5 mm on the upper surface of the specimen treated with the lithium nitrite solution described above, and was cured in humid air (20°C, RH 90%) for 3 days.
【００３３】（錆の進行とその状況）さらに上塗りされ
た供試体は、前記ＪＣＩの乾湿繰返し法（条件は同一）
にしたがって処理し、錆を進行させた。(Progress of rust and its situation) Furthermore, the overcoated specimen was subjected to the above-mentioned JCI dry-wet cycle method (same conditions).
The rust was progressed by treatment according to the following.
【００３４】その後すべての供試体を破壊し、棒鋼を取
り出し、両端１ｃｍを除く８ｃｍの部分の表面（２５．
１ｃｍ２）の錆の生じている面積を測定したのち、各供
試体について棒鋼２本の錆面積率の平均値を算出し、そ
の結果を表１に併記した。以上から本発明は、鉄筋コン
クリ−トに埋設されている鉄筋の錆進行を大幅に抑止す
る効果を有していることが判明した。[0034] After that, all the specimens were destroyed, the steel bar was taken out, and the surface of the 8 cm section excluding 1 cm at both ends (25.
After measuring the rusted area of 1 cm2), the average value of the rust area ratio of the two steel bars was calculated for each specimen, and the results are also listed in Table 1. From the above, it has been found that the present invention has the effect of significantly inhibiting the progress of rust in reinforcing bars embedded in reinforced concrete.
【００３５】[0035]
【表 １】[Table 1]
【００３６】[0036]
【発明の効果】本発明にしたがえば、亜硝酸溶液を含浸
させた鉄筋コンクリ−ト表面にポリマ−セメト組成物を
単に上塗りした従来法に比して、きわめて単純な手段で
あるにかかわらず、顕著な錆抑止効果を発揮する。
しかも従来法で使用されていた材料をそのまま利用する
ので、実施化は容易である。その結果、塩分含有鉄筋コ
ンクリ−トはもとより一般の鉄筋コンクリ−トも含め、
それらの耐久性改善に寄与できることは大きい。Effects of the Invention According to the present invention, although it is an extremely simple method compared to the conventional method of simply overcoating a reinforced concrete surface impregnated with a nitrous acid solution with a polymer cement composition, , exhibits a remarkable rust-preventing effect.
Moreover, since the materials used in the conventional method are used as they are, implementation is easy. As a result, not only salt-containing reinforced concrete but also general reinforced concrete,
It would be great to be able to contribute to improving their durability.
Claims (1)
を塗布し、含浸させたのち、ポリマ−セメント組成物を
上塗りする鉄筋コンクリ−トの錆抑止方法において、該
ポリマ−セメント組成物に対して亜硝酸塩を混合するこ
とを特徴とする鉄筋コンクリ−トの錆抑止方法。Claim 1: A method for inhibiting rust in reinforced concrete, in which reinforced concrete is coated with a nitrite solution, impregnated, and then overcoated with a polymer cement composition. A method for inhibiting rust in reinforced concrete, characterized by mixing nitrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10956991A JP2939490B2 (en) | 1991-04-16 | 1991-04-16 | Rust control method for reinforced concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10956991A JP2939490B2 (en) | 1991-04-16 | 1991-04-16 | Rust control method for reinforced concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04317448A true JPH04317448A (en) | 1992-11-09 |
| JP2939490B2 JP2939490B2 (en) | 1999-08-25 |
Family
ID=14513573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10956991A Expired - Lifetime JP2939490B2 (en) | 1991-04-16 | 1991-04-16 | Rust control method for reinforced concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2939490B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006143547A (en) * | 2004-11-24 | 2006-06-08 | Ube Ind Ltd | Hydraulic composition having excellent rust preventability |
| JP2006232559A (en) * | 2005-02-22 | 2006-09-07 | Sumitomo Osaka Cement Co Ltd | Electrolytic corrosion protection method of concrete |
| JP2006273604A (en) * | 2005-03-28 | 2006-10-12 | Denki Kagaku Kogyo Kk | Rust-preventive agent composition and rust preventive treatment method using the same |
| JP2009107910A (en) * | 2007-10-31 | 2009-05-21 | Takenaka Komuten Co Ltd | Alkali treatment liquid and treating method of concrete molded product using thereof |
| JP2009208984A (en) * | 2008-03-03 | 2009-09-17 | Tsuruga Cement Kk | Surface modifying agent for mortar or concrete and surface modification method |
| JP2016183080A (en) * | 2015-03-26 | 2016-10-20 | 太平洋セメント株式会社 | Solution for improving concrete structure |
| JP2020158371A (en) * | 2019-03-27 | 2020-10-01 | 太平洋マテリアル株式会社 | Polymer cement mortar and repair method of reinforced concrete |
| JP2021059927A (en) * | 2019-10-09 | 2021-04-15 | 川田建設株式会社 | Method for removing salt from concrete structure |
-
1991
- 1991-04-16 JP JP10956991A patent/JP2939490B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006143547A (en) * | 2004-11-24 | 2006-06-08 | Ube Ind Ltd | Hydraulic composition having excellent rust preventability |
| JP4539304B2 (en) * | 2004-11-24 | 2010-09-08 | 宇部興産株式会社 | Hydraulic composition with excellent rust prevention |
| JP2006232559A (en) * | 2005-02-22 | 2006-09-07 | Sumitomo Osaka Cement Co Ltd | Electrolytic corrosion protection method of concrete |
| JP2006273604A (en) * | 2005-03-28 | 2006-10-12 | Denki Kagaku Kogyo Kk | Rust-preventive agent composition and rust preventive treatment method using the same |
| JP2009107910A (en) * | 2007-10-31 | 2009-05-21 | Takenaka Komuten Co Ltd | Alkali treatment liquid and treating method of concrete molded product using thereof |
| JP2009208984A (en) * | 2008-03-03 | 2009-09-17 | Tsuruga Cement Kk | Surface modifying agent for mortar or concrete and surface modification method |
| JP2016183080A (en) * | 2015-03-26 | 2016-10-20 | 太平洋セメント株式会社 | Solution for improving concrete structure |
| JP2020158371A (en) * | 2019-03-27 | 2020-10-01 | 太平洋マテリアル株式会社 | Polymer cement mortar and repair method of reinforced concrete |
| JP2021059927A (en) * | 2019-10-09 | 2021-04-15 | 川田建設株式会社 | Method for removing salt from concrete structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2939490B2 (en) | 1999-08-25 |
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