JPS6125781B2 - - Google Patents
Info
- Publication number
- JPS6125781B2 JPS6125781B2 JP13265478A JP13265478A JPS6125781B2 JP S6125781 B2 JPS6125781 B2 JP S6125781B2 JP 13265478 A JP13265478 A JP 13265478A JP 13265478 A JP13265478 A JP 13265478A JP S6125781 B2 JPS6125781 B2 JP S6125781B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- slurry
- reinforcing
- reinforcing bars
- rust
- 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
- 230000003014 reinforcing effect Effects 0.000 claims description 38
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 23
- 239000000843 powder Substances 0.000 claims description 19
- 229920005989 resin Polymers 0.000 claims description 18
- 239000011347 resin Substances 0.000 claims description 18
- 229920000126 latex Polymers 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000000839 emulsion Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- 239000000377 silicon dioxide Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 8
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 8
- 235000012241 calcium silicate Nutrition 0.000 claims description 8
- 239000000292 calcium oxide Substances 0.000 claims description 7
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 7
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- 239000011381 foam concrete Substances 0.000 claims description 5
- 229920001971 elastomer Polymers 0.000 claims description 4
- 239000005060 rubber Substances 0.000 claims description 4
- 239000002002 slurry Substances 0.000 description 26
- 239000004568 cement Substances 0.000 description 16
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 11
- 235000012255 calcium oxide Nutrition 0.000 description 6
- 239000004567 concrete Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 230000003449 preventive effect Effects 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- 235000019738 Limestone Nutrition 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000005038 ethylene vinyl acetate Substances 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 235000011116 calcium hydroxide Nutrition 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- 239000005018 casein Substances 0.000 description 2
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 2
- 235000021240 caseins Nutrition 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 150000004677 hydrates Chemical class 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000007586 pull-out test Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- RGHNJXZEOKUKBD-SQOUGZDYSA-M D-gluconate Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O RGHNJXZEOKUKBD-SQOUGZDYSA-M 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- DSLZVSRJTYRBFB-UHFFFAOYSA-N Galactaric acid Natural products OC(=O)C(O)C(O)C(O)C(O)C(O)=O DSLZVSRJTYRBFB-UHFFFAOYSA-N 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 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
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000013556 antirust agent Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- DSLZVSRJTYRBFB-DUHBMQHGSA-N galactaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)[C@@H](O)[C@H](O)C(O)=O DSLZVSRJTYRBFB-DUHBMQHGSA-N 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 229940050410 gluconate Drugs 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 229920006173 natural rubber latex Polymers 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Description
この発明は、高温高圧の水蒸気養生を行なつて
製造される軽量気泡コンクリート用の補強鉄筋の
防錆被膜形成剤に関する。
一般に、軽量気泡コンクリートは、セメント、
石灰などの石灰質原料と、珪砂、珪石などの珪酸
質原料とを粉砕したものに水を加えてスラリーと
し、このスラリーにアルミニウム粉などの金属粉
末を加えて撹拌し、これを補強鉄筋が組込まれた
型枠内に流込んで発泡せしめたのち、凝結・硬化
させ、しかるのちオートクレーブ内で高温高圧の
水蒸気養生を行なつて製造されている。
このようにして製造される軽量気泡コンクリー
トは、優れた建築材料であり、広い用途を有する
が、これは空隙率が通常70％前後と大きく、その
ためここに各種気体や液体が浸透すると内部の補
強鉄筋が腐食されやすいという欠点をもつてい
る。かかる欠点を避けるために、これまでもあら
かじめ補強鉄筋に各種の防錆剤で被膜を形成させ
て補強鉄筋の腐食を防止し、あわせて補強鉄筋と
セメントマトリツクスとの付着を図ることが通常
行なわれてきた。
これらには、例えばセメントにカゼイン、ゼ
ラチンおよびメチルセルローズを加えて水性スラ
リーを用いるもの（特公昭31−2843号公報参
照）、セメントとゴムラテツクスからなる水性
スラリーを用いるもの（特公昭36−2387号公報参
照）、セメントとエチレン―酢酸ビニル共重合
体樹脂エマルジヨンからなる水性スラリーにヒド
ロキシエチルセルローズを加えたもの（特公昭51
−5854号公報参照）およびセメントとゴムラテ
ツクスまたは樹脂エマルジヨンからなる水性スラ
リーに、セメントの凝結調節剤としてミルクカゼ
インとムチン酸、グルコン酸塩、ホウ酒石酸塩、
ソジウムボロヘプトネートおよびデキストリンの
中より選択された１種または２種以上および苛性
アルカリを加えたもの（特開昭52−40446号公報
参照）などがある。
これら従来のセメント系の防錆被膜形成剤はい
ずれも防錆効果および付着強度の点では優れてい
る。しかし、ポルトランドセメントを結合材とし
て用いているため、短時間にセメントの水和反応
が進行し、これにともないスラリーの流動性が低
下し、ついには凝固して補強鉄筋の被膜形成作業
が不可能になるという大きい問題点がある。
実験によれば、上述の〜の技術のように比
較的簡単に調製できる防錆被膜形成剤のスラリー
は、いずれも短いもので３〜４時間、長いもので
も５〜６日間で凝固してしまう。また、上述の
の技術のようにセメントの凝固調節剤を少量づつ
多数組合せて添加したスラリーは、調製が面倒で
あるにもかかわらず、10日前後で凝固してしまう
（後記実験例参照）。
一般に軽量気泡コンクリート用の補強鉄筋の防
錆被膜形成剤を入れる槽は大型であり、この内容
物を短時間毎に全量交換するとすれば、その労力
や経費が膨大となり、当然コストの上昇に大きく
影響してくる。このためにこれまでも当業者間で
はポツトライフ（使用可能時間）の長い防錆被膜
形成剤の出現が強く望まれている。
実験例
普通ポルトランドセメントに対してカチオン性
スチレン―ブタジエンゴムラテツクス（ゴム分45
重量％）を10重量％（固形分基準）加えて混合
し、これを第１表に示す添加剤を加えたのち、水
を普通ポルトランドセメントに対して外割で28重
量％加えて充分に撹拌して各種のスラリーを調製
し、ゆるやかに撹拌しながら保存してそれらの経
時的な状態変化を観察して第１表に示す結果を得
た。なお、第１表中〇印はスラリーが全く変化し
ないこと、△印はスラリーに沈澱物が生じたかあ
るいは粘度が上昇していること、×印はスラリー
に生じた沈澱物が硬化までには至つていないが、
激しく再撹拌しても当初のスラリー状態にもどら
ないこと、××印はスラリーに生じた沈澱が完全
に硬化していることを示す。
The present invention relates to a rust-preventing film forming agent for reinforcing reinforcing bars for lightweight cellular concrete manufactured by curing with high-temperature and high-pressure steam. Generally, lightweight aerated concrete is made of cement,
Calcareous raw materials such as lime and silicic raw materials such as silica sand and silica stone are crushed and water is added to make a slurry. Metal powder such as aluminum powder is added to this slurry and stirred, and reinforcing reinforcing bars are incorporated. It is manufactured by pouring it into a mold to foam, condensing and hardening it, and then curing it in high-temperature, high-pressure steam in an autoclave. The lightweight aerated concrete produced in this way is an excellent building material and has a wide range of uses, but it has a large porosity, usually around 70%, so when various gases and liquids permeate there, internal reinforcement The disadvantage is that the reinforcing steel is susceptible to corrosion. In order to avoid such drawbacks, it has been common practice to prevent corrosion of reinforcing reinforcing bars by forming a film on the reinforcing reinforcing bars in advance with various anti-rust agents, and to also try to bond the reinforcing reinforcing bars to the cement matrix. It's been coming. Examples of these methods include those that use an aqueous slurry made by adding casein, gelatin, and methylcellulose to cement (see Japanese Patent Publication No. 31-2843), and those that use an aqueous slurry consisting of cement and rubber latex (see Japanese Patent Publication No. 36-2387). ), hydroxyethyl cellulose is added to an aqueous slurry consisting of cement and ethylene-vinyl acetate copolymer resin emulsion (Special Publication No. 51)
-5854 Publication) and an aqueous slurry consisting of cement and rubber latex or resin emulsion, milk casein, mucic acid, gluconate, borotartrate, etc. as cement setting regulators.
Examples include those containing one or more selected from sodium boroheptonate and dextrin and a caustic alkali (see Japanese Patent Application Laid-open No. 40446/1983). All of these conventional cement-based antirust film forming agents are excellent in terms of antirust effect and adhesive strength. However, since Portland cement is used as a binder, the hydration reaction of the cement progresses in a short period of time, which reduces the fluidity of the slurry and eventually solidifies, making it impossible to form a coating on reinforcing reinforcing bars. There is a big problem with becoming. According to experiments, slurries of rust-preventive film forming agents that can be prepared relatively easily, such as in the above-mentioned technology, solidify in as little as 3 to 4 hours and as long as 5 to 6 days. . Furthermore, as in the technique described above, a slurry in which a large number of combinations of cement coagulation regulators are added in small amounts solidifies in about 10 days, although it is cumbersome to prepare (see experimental example below). Generally, the tank containing the anti-rust film forming agent for reinforcing reinforcing bars for lightweight aerated concrete is large, and if the contents were to be replaced in its entirety every short period of time, the labor and expense involved would be enormous, which would of course lead to a significant increase in costs. It will affect you. For this reason, there has been a strong desire among those skilled in the art for a rust preventive film forming agent with a long pot life. Experimental example: Cationic styrene-butadiene rubber latex (rubber content: 45
After adding 10% by weight (based on solid content) of 10% by weight (based on solid content) and mixing, add the additives shown in Table 1, add 28% by weight of water based on ordinary Portland cement, and stir thoroughly. Various slurries were prepared, stored with gentle stirring, and changes in their state over time were observed, and the results shown in Table 1 were obtained. In Table 1, ○ indicates that the slurry has not changed at all, △ indicates that a precipitate has formed in the slurry or the viscosity has increased, and × indicates that the slurry has not yet hardened due to the precipitate. I'm not sure, but
The slurry does not return to its original state even after vigorous re-stirring, and the XX mark indicates that the precipitate formed in the slurry has completely hardened.
【表】【table】
【表】
この発明は、上記の点に鑑みなされてもので、
調製が比較的簡単で、しかもポツトライフが極め
て長く、かつ硬化後の防錆効果および鉄筋への付
着強度に優れた軽量気泡コンクリート用補強鉄筋
の防錆被膜形成剤を提供するものである。
すなわち、この発明は、焼結珪酸二石灰が90〜
98重量部、遊離酸化カルシウムが10〜２重量部、
シリカが30〜90重量部からなる粉末混合物に対し
てゴムラテテツクスまたは樹脂エマルジヨンと水
をゴム分または樹脂分として外割で５〜20重量％
加えてスラリー状混合物としてなることを特徴と
する軽量気泡コンクリート用補強鉄筋の防錆被膜
形成剤である。
かかるこの発明の防錆被膜形成剤は、常温での
水和硬化は極めて緩慢であるが、水蒸気養生条件
下においてはすみやかに水和硬化する焼結珪酸二
石灰、遊離酸化カルシウムおよびシリカからなる
粉末混合物を用いるため、ホツトライフが極めて
長く、半永久的である。また、この発明のものは
セメントの凝結調節剤を種々組合せて添加したも
のに比べて調製が簡単である。
なお、水蒸気養生のさいには、上記の粉末混合
物は水和反応して珪酸カルシウム水和物となり、
ゴム分または樹脂分とともに密実な不透水性の膜
を形成し、さらに鉄筋の表面を不動態化するた
め、軽量気泡コンクリート中の鉄筋に対する防錆
効果および鉄筋ならびにマトリツクスとの付着強
度が極めて高い。
この発明に用いる焼結珪酸二石灰はβ型である
ことが好ましいがγ型が混入していても差支えな
い。また、焼結珪酸二石灰中には通常のポルトラ
ンドセメント中に存在する少量の酸化物が混入し
ていてもよい。粉末混合物中の各成分の割合は、
水蒸気養生のさいに高強度の防錆被膜が生成され
る範囲を示したものであり、この範囲をはずれる
と防錆被膜の付着強度が低くなる。また遊離酸化
カルシウムは、水蒸気養生時の粉末混合物の水和
活性を高めるとともに、鉄筋表面のアルカリ度を
高めるために必要なもので、具体的には焼結珪酸
二石灰中に含まれる未反応の遊離酸化カルシウム
でもよく、また別途に添加された生石灰および消
石灰などでもよい。
ゴムラテツクスまたは樹脂エマルジヨンは、防
錆被膜を不透水性にするために加えるものであり
通常セメント混和用として市販されているものを
すべて使用することができる。例えば安定化処理
された天然ゴムラテツクス、ポリクロロプレンゴ
ムラテツクス、スチレン―ブタジエンゴムラテツ
クス、アクリロニトリル―ブタジエンゴムラテツ
クスなどのゴムラテツクスおよびアクリル樹脂エ
マルジヨン、エチレン―酢酸ビニル樹脂エマルジ
ヨン、ポリスチレン樹脂エマルジヨンなどの樹脂
エマルジヨンなどである。その添加量は、前述の
粉末混合物に対してゴム分または樹脂分として外
割で５〜20重量％が好ましいが、この量が５重量
％より少ないと、防水膜の形成が不十分になり、
また20重量％より多くなると結合材が少なく鉄筋
への付着強度が低下する。
最終的に加える水の量は、ゴムラテツクスまた
は樹脂エマルジヨン中の水分量と得られたスラリ
ーを補強鉄筋に塗布する方法とを勘案して適宜定
めればよい。
例えばスプレー塗布の場合、ゴムラテツクスま
たは樹脂エマルジヨン中の水分と、さらに追加す
る水分の合計が粉末混合物に対して外割で40〜50
重量％、ハケ塗りの場合は同じく20〜40重量％，
浸漬塗りの場合で20〜40重量％が適当である。
なお、本発明品を用いて補強鉄筋への塗布作業
を行なう場合、その量が少なくなれば、新らしい
ものを直接使用中のものに添加すればよく、この
場合新旧の混合によつてポツトライフが低下する
ようなことはない。
つぎに実施例について述べる。
実施例 １〜11
下記第２表に示す石灰石粉およ珪石粉を用い、
石灰石粉34.5Kgと珪石粉10.9Kgを混合し、この混
合物にホウ酸酸0.22Kgを加えて1550℃で４時間焼
結した。得られた焼結物の主成分はβ型珪酸二石
灰であり、遊離石灰は0.6％であつた。[Table] This invention was made in view of the above points, and
To provide a rust-preventive film-forming agent for reinforcing reinforcing bars for lightweight cellular concrete that is relatively easy to prepare, has an extremely long pot life, and has excellent rust-preventive effect and adhesion strength to the reinforcing bars after curing. That is, in this invention, the sintered dicalcium silicate is
98 parts by weight, 10-2 parts by weight of free calcium oxide,
Rubber latex or resin emulsion and water are added in an amount of 5 to 20% by weight as rubber or resin to a powder mixture containing 30 to 90 parts by weight of silica.
In addition, it is a rust-preventing film forming agent for reinforcing reinforcing bars for lightweight cellular concrete, which is formed as a slurry mixture. The anticorrosive film forming agent of the present invention is a powder consisting of sintered dicalcium silicate, free calcium oxide, and silica, which hydrates and hardens extremely slowly at room temperature, but quickly hydrates and hardens under steam curing conditions. Because it uses a mixture, it has an extremely long hot life and is semi-permanent. Furthermore, the preparation of the present invention is easier than that of cements in which various combinations of setting regulators are added. In addition, during steam curing, the above powder mixture undergoes a hydration reaction and becomes calcium silicate hydrate.
It forms a dense, water-impermeable film with the rubber or resin content, and also passesivates the surface of the reinforcing bars, so it has an extremely high anti-corrosion effect on the reinforcing bars in lightweight aerated concrete and has extremely high adhesion strength to the reinforcing bars and matrix. . The sintered dicalcium silicate used in this invention is preferably of the β type, but there is no problem even if the γ type is mixed therein. Further, a small amount of oxides present in ordinary Portland cement may be mixed in the sintered dicalcium silicate. The proportion of each component in the powder mixture is
This shows the range in which a high-strength anti-rust coating is produced during steam curing, and outside this range, the adhesion strength of the anti-rust coating decreases. In addition, free calcium oxide is necessary to increase the hydration activity of the powder mixture during steam curing and to increase the alkalinity of the reinforcing steel surface. Free calcium oxide may be used, or separately added quicklime, slaked lime, etc. may be used. The rubber latex or resin emulsion is added to make the anticorrosive coating water-impermeable, and any rubber latex or resin emulsion that is commercially available for mixing with cement can be used. For example, rubber latexes such as stabilized natural rubber latex, polychloroprene rubber latex, styrene-butadiene rubber latex, acrylonitrile-butadiene rubber latex, and resin emulsions such as acrylic resin emulsion, ethylene-vinyl acetate resin emulsion, and polystyrene resin emulsion. etc. The amount added is preferably 5 to 20% by weight based on the rubber or resin content of the powder mixture, but if this amount is less than 5% by weight, the formation of a waterproof film will be insufficient.
Moreover, when the amount exceeds 20% by weight, there is less binding material and the adhesion strength to the reinforcing bars decreases. The final amount of water to be added may be determined as appropriate, taking into account the amount of water in the rubber latex or resin emulsion and the method of applying the obtained slurry to the reinforcing steel. For example, in the case of spray application, the total amount of water in the rubber latex or resin emulsion plus any additional water added is 40 to 50% of the powder mixture.
% by weight, 20-40% by weight for brush painting,
In the case of dip coating, 20 to 40% by weight is appropriate. In addition, when applying the product of the present invention to reinforcing reinforcing bars, if the amount is small, the new product can be added directly to the product in use; in this case, mixing the old and new products will shorten the pot life. There is no decline. Next, examples will be described. Examples 1 to 11 Using limestone powder and silica powder shown in Table 2 below,
34.5 kg of limestone powder and 10.9 kg of silica powder were mixed, 0.22 kg of boric acid was added to this mixture, and the mixture was sintered at 1550°C for 4 hours. The main component of the obtained sintered product was β-type dicalcium silicate, and free lime was 0.6%.
【表】
この焼結物をブレーン比表面積で3200cm2／ｇに
粉砕したのち、消石灰、珪石粉およびセメント混
和用スチレン―ブタジエンゴムラテツクス（ゴム
分45重量％）またはセメント混和用エチレン―酢
酸ビニル樹脂エマルジヨン（樹脂分55重量％）と
水とを第３表に示す種々の割合で混合して、スラ
リー状の防錆被膜形成剤を調製した。これらのス
ラリーはゆるやかに撹拌しながら３ケ月間常温で
保存しても変化は全く認められなかつた。つぎ
に、この３ケ月間放置したスラリーに、直径６mm
の補強鉄筋を浸漬したのち、引上げて乾燥し、鉄
筋表面に厚さ0.5〜1.0mmの被膜を形成させた。こ
れらの鉄筋を120×120×150mmの型枠内に固定
し、かさ比重が0.5となるように配合した軽量気
泡コンクリートスラリーを注入した。発泡が終了
してスラリーが十分硬化したのち、180℃で10時
間オートクレーブ中で水蒸気養生した。得られた
試験体を鉄筋引抜き試験に供するとともに
DIN4223に準じた試験方法に基づいて30日間防錆
試験を行なつた。
試験結果は第３表に示すとおりであるが調製直
後の防錆被膜形成剤を用いて行なつた場合もほぼ
同様な結果が得られた。[Table] After pulverizing this sintered material to a Blaine specific surface area of 3200 cm 2 /g, slaked lime, silica powder and styrene-butadiene rubber latex (rubber content 45% by weight) for mixing with cement or ethylene-vinyl acetate for mixing with cement were prepared. Resin emulsion (resin content: 55% by weight) and water were mixed at various ratios shown in Table 3 to prepare rust-preventive film forming agents in the form of slurry. Even when these slurries were stored at room temperature for 3 months with gentle stirring, no change was observed. Next, a diameter of 6 mm was added to the slurry that had been left for the past three months.
After immersing the reinforcing bars, they were pulled up and dried to form a film with a thickness of 0.5 to 1.0 mm on the surface of the reinforcing bars. These reinforcing bars were fixed in a 120 x 120 x 150 mm formwork, and a lightweight aerated concrete slurry mixed so that the bulk specific gravity was 0.5 was poured. After foaming was completed and the slurry was sufficiently hardened, it was steam-cured in an autoclave at 180°C for 10 hours. The obtained specimen was subjected to a reinforcing bar pullout test and
A 30-day rust prevention test was conducted based on a test method according to DIN4223. The test results are shown in Table 3, and almost the same results were obtained when the rust preventive film forming agent was used immediately after preparation.
【表】
実施例 12〜22
第２表に示した石灰石粉およ珪石粉を用い、石
灰石粉34.5Kgと珪石粉10.9Kgを混合し、この混合
物にホウ酸0.22Kgを加えて1400℃で４時間焼結し
た。得られた焼結物の主成分はβ型珪酸二石灰で
あり、遊離酸化カルシウムは2.5％であつた。こ
の焼結物をブレーン比表面積で3200cm2／Kgに粉砕
したのち、消石灰、珪石粉およびセメント混和用
スチレン―ブタジエンゴムラテツクス（ゴム分45
重量％）またはセメント混和用エチレン―酢酸ビ
ニル樹脂エマルジヨン（樹脂分55重量％）と水と
を、第４表に示す種々の割合で混合してスラリー
状の防錆被膜形成剤を調製した。これらのスラリ
ーはゆるやかに撹拌しながら３ケ月間常温で保存
しても変化は全く認められなかつた。つぎにこの
３ケ月間放置したスラリーに直径６mmの補強鉄筋
を浸漬したのち引上げて乾燥し、鉄筋表面に厚さ
0.5〜1.0mmの被膜を形成させた。これらの鉄筋を
120×120×150mmの型枠内に固定し、かさ比重が
0.5となるように配合した軽量気泡コンクリート
スラリーを注入した。発泡が終了してスラリーが
十分硬化したのち、180℃で10時間オートクレー
ブ中で水蒸気養生した。得られた試験体は、鉄筋
引抜き試験に供するとともに、DIN4223に準じた
試験方法に基づいて30日間防錆試験を行なつた。
試験結果は第４表に示すとおりであるが、調製直
後の防錆被膜形成剤を用いて行なつた場合もほぼ
同様な結果が得られた。[Table] Examples 12 to 22 Using the limestone powder and silica powder shown in Table 2, 34.5 kg of limestone powder and 10.9 kg of silica powder were mixed, 0.22 kg of boric acid was added to this mixture, and the mixture was heated at 1400℃. Sintered for hours. The main component of the obtained sintered product was β-type dicalcium silicate, and free calcium oxide was 2.5%. After pulverizing this sintered material to a Blaine specific surface area of 3200cm 2 /Kg, it was crushed into styrene-butadiene rubber latex (rubber content: 45%) for mixing with slaked lime, silica powder, and cement.
% by weight) or an ethylene-vinyl acetate resin emulsion for admixture with cement (resin content: 55% by weight) and water were mixed at various ratios shown in Table 4 to prepare a slurry-like rust preventive film forming agent. Even when these slurries were stored at room temperature for 3 months with gentle stirring, no change was observed. Next, reinforcing reinforcing bars with a diameter of 6 mm are immersed in the slurry that has been left for three months, and then pulled out and dried to create a thick layer on the surface of the reinforcing bars.
A film of 0.5-1.0 mm was formed. These reinforcing bars
Fixed in a 120 x 120 x 150 mm formwork, the bulk specific gravity
A lightweight aerated concrete slurry mixed at a ratio of 0.5 was injected. After foaming was completed and the slurry was sufficiently hardened, it was steam-cured in an autoclave at 180°C for 10 hours. The obtained test specimens were subjected to a reinforcing bar pull-out test and a 30-day rust prevention test based on a test method according to DIN4223.
The test results are shown in Table 4, and almost the same results were obtained when the rust preventive film forming agent was used immediately after preparation.
【表】
以上、この発明の軽量気泡コンクリート用補強
鉄筋の防錆被膜形成剤は調製が簡単で、防錆効果
および付着強度に優れ、しかもポツトライフが極
めて長い。[Table] As described above, the rust preventive film forming agent for reinforcing reinforcing bars for lightweight cellular concrete of the present invention is easy to prepare, has excellent rust preventive effects and adhesion strength, and has an extremely long pot life.
Claims (1)
ルシウムが10〜２重量部、シリカが30〜90重量部
からなる粉末混合物に対しゴムラテツクスまたは
樹脂エマルジヨンと水をゴム分または樹脂分とし
て外割で５〜20重量％加えてスラリー状混合物と
してなることを特徴とする軽量気泡コンクリート
用補強鉄筋の防錆被膜形成剤。1 Rubber latex or resin emulsion and water are added as rubber or resin to a powder mixture consisting of 90 to 98 parts by weight of sintered dicalcium silicate, 10 to 2 parts by weight of free calcium oxide, and 30 to 90 parts by weight of silica. A rust-preventing film forming agent for reinforcing reinforcing bars for lightweight cellular concrete, characterized in that it is made into a slurry-like mixture by adding 5 to 20% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13265478A JPS5560058A (en) | 1978-10-30 | 1978-10-30 | Rust proofing coating forming agent for iron reinforcing lightweight foamed concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13265478A JPS5560058A (en) | 1978-10-30 | 1978-10-30 | Rust proofing coating forming agent for iron reinforcing lightweight foamed concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5560058A JPS5560058A (en) | 1980-05-06 |
| JPS6125781B2 true JPS6125781B2 (en) | 1986-06-17 |
Family
ID=15086369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13265478A Granted JPS5560058A (en) | 1978-10-30 | 1978-10-30 | Rust proofing coating forming agent for iron reinforcing lightweight foamed concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5560058A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6157745A (en) * | 1984-08-27 | 1986-03-24 | 中越 千吉 | Metal long article or plate body for reinforcing hydraulic cement or plaster |
| JPS61211376A (en) * | 1985-03-15 | 1986-09-19 | Kowa Kagaku Kogyo Kk | Rust-and corrosion-preventing coating material composition |
| JP6892062B2 (en) * | 2017-09-21 | 2021-06-18 | 住友金属鉱山シポレックス株式会社 | Manufacturing method of rust preventive material for lightweight cellular concrete reinforcing bars |
-
1978
- 1978-10-30 JP JP13265478A patent/JPS5560058A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5560058A (en) | 1980-05-06 |
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