JPH0825199B2 - Aerated concrete product manufacturing method - Google Patents
Aerated concrete product manufacturing methodInfo
- Publication number
- JPH0825199B2 JPH0825199B2 JP29936589A JP29936589A JPH0825199B2 JP H0825199 B2 JPH0825199 B2 JP H0825199B2 JP 29936589 A JP29936589 A JP 29936589A JP 29936589 A JP29936589 A JP 29936589A JP H0825199 B2 JPH0825199 B2 JP H0825199B2
- Authority
- JP
- Japan
- Prior art keywords
- rust preventive
- cement
- reinforcing bar
- latex
- aerated 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 - Lifetime
Links
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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、例えば工業化住宅用パネル等の気泡コンク
リート製品の製造方法に関し、特にその中に埋設される
補強鉄筋の防錆に関する。Description: TECHNICAL FIELD The present invention relates to a method for producing an aerated concrete product such as a panel for industrialized houses, and more particularly to rust prevention of a reinforcing steel bar embedded therein.
［背景技術］ セメントとケイ砂を主原料とし、気泡が混入されたコ
ンクリートスラリーを補強鉄筋に配置された成形用型枠
内に打設し、一次的に硬化させた後、高温、高圧のオー
トクレーブ中で養生させることにより製造される気泡コ
ンクリートパネルが実用化されている。この気泡コンク
リートパネルの製造において、原材料の一部としてアル
ミナセメントのような急硬材を用いることにより、コン
クリートスラリーを成形用型枠内に打設した後、パネル
の早期脱型を図っている。[Background Art] A concrete slurry containing cement and silica sand as main raw materials and mixed with air bubbles is placed in a molding formwork placed in a reinforcing bar and temporarily cured, and then a high temperature, high pressure autoclave. Aerated concrete panels produced by curing in the air have been put to practical use. In the production of this aerated concrete panel, a rapid hardening material such as alumina cement is used as a part of the raw material, and after the concrete slurry is placed in the molding frame, the panel is quickly demolded.
［発明が解決しようとする課題］ 上述した気泡コンクリートパネル１の製造において、
その中に埋設される補強鉄筋が水分により腐食するのを
防止するため、従来例えばセメントラテックス系防錆剤
が塗装された鉄筋を使用している。[Problems to be Solved by the Invention] In manufacturing the cellular concrete panel 1 described above,
In order to prevent the reinforcing reinforcing bars embedded therein from being corroded by moisture, conventionally, reinforcing bars coated with, for example, a cement latex anticorrosive agent have been used.
しかし、セメントラテックス系防錆剤が塗装された鉄
筋は、急硬材を含有するコンクリートスラリーを成形用
型枠内に打設した際にセメントラテックス系防錆剤が膨
潤して気泡コンクリートにクラックが発生するという問
題点があった。However, the reinforcing rod coated with cement latex rust preventive agent cracks the cellular concrete when the cement latex rust preventive agent swells when the concrete slurry containing the rapid hardening material is placed in the molding frame. There was a problem that it occurred.
なお、クラック発生防止のため、オートクレーブ養生
前に気泡コンクリートの強度を上げると、オートクレー
ブ養生による強度発現が進みにくくなるため、逆に得ら
れた製品の強度が低くなる。If the strength of the cellular concrete is increased before curing the autoclave in order to prevent cracks from being generated, it becomes difficult for the strength of the concrete to develop due to the curing of the autoclave, so that the strength of the obtained product decreases.
本発明は、セメントラテックス系防錆剤が塗装された
鉄筋が埋設された気泡コンクリート製品の製造におい
て、クラックの発生を防止することができる製造方法を
提供することを目的とする。An object of the present invention is to provide a production method capable of preventing the occurrence of cracks in the production of an aerated concrete product in which a reinforcing bar coated with a cement latex rust preventive is embedded.
［課題を解決するための手段及び作用］ 本発明は、セメントラテックス系防錆剤が塗装された
鉄筋が埋設された気泡コンクリート製品の製造方法にお
いて、セメントラテックス系防錆剤を鉄筋に塗装する工
程と、前記セメントラテックス系防錆剤の上に防水剤を
塗装する工程と、前記鉄筋を成形用型枠内に配置して気
泡が混入されたコンクリートスラリーを打設する工程と
を有することを特徴とする。[Means and Actions for Solving Problems] The present invention relates to a method for producing a cellular concrete product in which a reinforcing bar coated with a cement latex rust preventive is embedded, in which a cement latex rust preventive is applied to the reinforcing bar. And a step of coating a waterproofing agent on the cement latex-based rust preventive agent, and a step of placing the reinforcing bar in a molding form and placing a concrete slurry in which air bubbles are mixed. And
セメントラテックス系防錆剤の上に前記防水剤を上塗
りすることにより、鉄筋が配置された成形用型枠内にコ
ンクリートスラリーを流し込んだ後、セメントラテック
ス系防錆剤が水分と接触して給水膨潤することを防止す
る。By casting the above-mentioned waterproofing agent on the cement latex rust preventive agent and then pouring the concrete slurry into the molding formwork in which the reinforcing bars are arranged, the cement latex rust preventive agent comes into contact with water and swells in water supply. To prevent
前記セメントラテックス系防錆剤は、例えばセメント
（ポルトランドセメント或いは中庸熱ポルトランドセメ
ント）、合成高分子ラテックス、凝結遅延剤、腐食抑制
剤及び水の混合物より成る。The cement latex rust preventive agent is composed of, for example, cement (Portland cement or moderate heat Portland cement), synthetic polymer latex, set retarder, corrosion inhibitor and water mixture.
この防錆剤は、１度塗りを行って厚い塗膜を形成した
場合、乾燥過程でクラックが発生して防錆効果が得られ
なくなったり、塗りむらやピンホール発生の原因となる
ので、薄い塗膜で２度塗りを行うのがよい。If this rust preventive agent is applied once to form a thick coating film, cracks may occur during the drying process to prevent the rust preventive effect, and it may cause uneven coating or pinholes. It is better to apply the coating twice.
前記防水剤としては、耐熱性と耐アルカリ性にも優れ
た樹脂及び水ガラスを使用するのが好ましい。この種の
樹脂の具体例は、アクリル樹脂、スチレンアクリル樹
脂、エポキシ樹脂、フェノール樹脂、フェノキシ樹脂、
フッ素樹脂等である。As the waterproofing agent, it is preferable to use resin and water glass having excellent heat resistance and alkali resistance. Specific examples of this type of resin include acrylic resin, styrene acrylic resin, epoxy resin, phenol resin, phenoxy resin,
Fluororesin or the like.
気泡が混入されたコンクリートスラリーの作製法は、
予め作った泡をスラリーに混合する方法、Al粉のような
発泡剤を用い、型枠にスラリーを打設後発泡させる方法
等任意である。The method of producing concrete slurry containing air bubbles is
Any method may be used, such as a method of mixing bubbles made in advance with the slurry, a method of using a foaming agent such as Al powder, and pouring the slurry into a mold and then foaming.
［実施例］ 本発明を軽量気泡コンクリートパネルの製造に適用し
た場合の実施例を説明する。[Example] An example in which the present invention is applied to the production of a lightweight cellular concrete panel will be described.
実施例１ 使用したセメントラテックス系防錆剤の組成を下記に
示す。Example 1 The composition of the cement latex rust preventive used is shown below.
中庸熱ポルトランドセメント……100重量部 合成高分子ラテックスＡ〔クロスレンCMX（商品
名）、武田薬品（株）製〕 ……８重量部 合成高分子ラテックスＢ〔CX−Ｂ（商品名）、小野田
（株）製〕 ……３重量部 グルコン酸 ……１重量部 亜硝酸ソーダ ……１重量部 水 ……40重量部 予め脱脂、洗浄処理された補強鉄筋を、上記組成を有
するセメントラテックス系防錆剤中に浸漬することによ
り塗装した後、この鉄筋を90℃の熱風乾燥炉中に30分間
置いて乾燥させた。この塗装及び乾燥操作を２回繰り返
した後、希釈した水ガラス〔ケイ酸ソーダ：Na2O・nSiO
2・nH2O〕をスプレー塗装し、１時間常温で放置した。Moderate heat Portland cement …… 100 parts by weight Synthetic polymer latex A [Crosslen CMX (trade name), manufactured by Takeda Pharmaceutical Co., Ltd.] …… 8 parts by weight Synthetic polymer latex B [CX-B (trade name), Onoda ( Co., Ltd.] ...... 3 parts by weight Gluconic acid ...... 1 part by weight Sodium nitrite ...... 1 part by weight Water ...... 40 parts by weight Reinforcing bar that has been degreased and washed in advance is cement latex rust preventive with the above composition After coating by immersing in the agent, this rebar was placed in a hot air drying oven at 90 ° C. for 30 minutes to dry. After repeating this coating and drying operation twice, diluted water glass [sodium silicate: Na 2 O · nSiO
2 · nH 2 O] was spray coated and left at room temperature for 1 hour.
このように防錆処理が施された鉄筋を成形用型枠内に
設置し、普通ポルトランドセメント45重量部、珪石粉末
55重量部、アルミナセメント10重量部、水55重量部、気
泡剤〔フォーミックスCII（商品名）、ミサワセラミッ
クスケミカル（株）製〕１重量部より成る軽量気泡コン
クリートスラリーを流し込んだ。スラリーが凝固した
後、脱型し、次に180℃、10気圧のオートクレーブ中で
８時間養成して本実施例に係る軽量気泡コンクリートパ
ネルを製造した。In this way, the rust-proofed rebar was installed in the molding frame, and 45 parts by weight of ordinary Portland cement and silica stone powder were used.
A lightweight cellular concrete slurry consisting of 55 parts by weight, 10 parts by weight of alumina cement, 55 parts by weight of water, and 1 part by weight of a foaming agent [Formix CII (trade name), manufactured by Misawa Ceramics Chemical Co., Ltd.] was poured. After the slurry was solidified, it was demolded and then cured in an autoclave at 180 ° C. and 10 atm for 8 hours to manufacture a lightweight cellular concrete panel according to this example.
実施例２ 予め脱脂、洗浄処理された補強鉄筋を、実施例１と同
じ組成を有するセメントラテックス系防錆剤中に浸漬す
ることにより塗装した後、この鉄筋を90℃の熱風乾燥炉
中に30分間置いて乾燥させた。この塗装及び乾燥操作を
２回繰り返した後、アルカリ架橋型のアクリル共重合樹
脂エマルジョン〔ヨードゾルAF943（商品名）、カネボ
ウNSC（株）製〕をスプレー塗装し、１時間風乾した。Example 2 Reinforcing bars that had been degreased and washed in advance were coated by immersing them in a cement latex rust preventive having the same composition as in Example 1, and then the reinforcing bars were placed in a hot air drying oven at 90 ° C. for 30 hours. It was left to dry for a minute. After repeating this coating and drying operation twice, an alkali-crosslinking acrylic copolymer resin emulsion [Iodosol AF943 (trade name), manufactured by Kanebo NSC Co., Ltd.] was spray-coated and air-dried for 1 hour.
次に実施例１と同様に、防錆処理が施された鉄筋を成
形用型枠内に設置し、軽量気泡コンクリートスラリーを
打設した後、オートクレーブ養生を施して本実施例に係
る軽量気泡コンクリートパネルを製造した。Next, in the same manner as in Example 1, the reinforced anti-corrosion reinforcing bar was installed in the forming mold, and the lightweight cellular concrete slurry was placed therein, followed by autoclave curing to carry out the lightweight cellular concrete according to the present example. The panel was manufactured.
実施例３ 予め脱脂、洗浄処理された補強鉄筋を、実施例１と同
じ組成を有するセメントラテックス系防錆剤中に浸漬す
ることにより塗装した後、この鉄筋を90℃の熱風乾燥炉
中に30分間置いて乾燥させた。この塗装及び乾燥操作を
２回繰り返した後、アクリル共重合樹脂エマルジョン
（ヨードゾルGF5（商品名）、カネボウNSC（株）製〕を
スプレー塗装し、50℃で30分間乾燥した。Example 3 A reinforcing bar that has been degreased and washed in advance is coated by immersing it in a cement latex rust preventive having the same composition as in Example 1, and then the reinforcing bar is placed in a hot air drying oven at 90 ° C. It was left to dry for a minute. After repeating this coating and drying operation twice, an acrylic copolymer resin emulsion (Iodosol GF5 (trade name), manufactured by Kanebo NSC Ltd.) was spray-coated and dried at 50 ° C. for 30 minutes.
次に、実施例１と同様に、防錆処理が施された鉄筋を
成形用型枠内に設置し、軽量気泡コンクリートスラリー
を打設した後、オートクレーブ養生を施して本実施例に
係る軽量気泡コンクリートパネルを製造した。Next, in the same manner as in Example 1, the rust-proofed reinforcing bars were placed in the forming mold, and the lightweight aerated concrete slurry was placed therein, and then autoclave curing was applied to the lightweight bubbles according to the present example. Concrete panels were manufactured.
比較例１ 予め脱脂、洗浄処理された補強鉄筋を、上記実施例と
同じ組成を有するセメントラテックス系防錆剤中に浸漬
することにより塗装した後、この鉄筋を90℃の熱風乾燥
炉中に30分間置いて乾燥させた。この塗装及び乾燥操作
を２回繰り返した後、直ちにこの防錆処理が施された鉄
筋を成形用型枠内に設置し、実施例と同様に軽量気泡コ
ンクリートスラリーを打設した、次に、実施例と同様の
条件でオートクレーブ養生を施して本比較例に係る軽量
気泡コンクリートパネルを製造した。Comparative Example 1 A reinforcing bar that had been degreased and washed in advance was coated by immersing it in a cement latex-based rust preventive having the same composition as in the above example, and then the reinforcing bar was placed in a hot air drying oven at 90 ° C. It was left to dry for a minute. After repeating the coating and drying operations twice, the rust-proofed reinforcing bars were immediately placed in the forming mold, and the lightweight cellular concrete slurry was placed in the same manner as in Examples. Autoclave curing was performed under the same conditions as the example to produce a lightweight cellular concrete panel according to this comparative example.
比較例２ 予め脱脂、洗浄処理された補強鉄筋を、上記実施例と
同じ組成を有するセメントラテックス系防錆剤中に浸漬
することにより塗装した後、この鉄筋を90℃の熱風乾燥
炉中に30分間置いて乾燥させた。この塗装及び乾燥操作
を２回繰り返した後、シリコン樹脂系塗料〔セラミトー
ン（商品名）、藤倉化成（株）製〕をスプレー塗装し、
50℃で30分間乾燥した。Comparative Example 2 A reinforcing bar that had been degreased and washed in advance was coated by immersing it in a cement latex-based rust preventive having the same composition as in the above example, and then the reinforcing bar was placed in a hot air drying oven at 90 ° C. It was left to dry for a minute. After repeating this coating and drying operation twice, spray-coat a silicone resin-based coating [Ceramitone (trade name), Fujikura Kasei Co., Ltd.],
Dry at 50 ° C. for 30 minutes.
このように防錆処理が施された鉄筋を成形用型枠内に
設置し、実施例と同様に軽量気泡コンクリートスラリー
を流し込んだ。次に、実施例と同様の条件でオートクレ
ーブ養生を施して本比較例に係る軽量気泡コンクリート
パネルを製造した。The reinforcing rod thus treated with rust prevention was placed in the molding frame, and the lightweight cellular concrete slurry was poured in as in the example. Next, autoclave curing was performed under the same conditions as in the example to produce a lightweight cellular concrete panel according to this comparative example.
上記実施例及び比較例に係る各軽量気泡コンクリート
パネルについて、オートクレーブ養生前とオートクレー
ブ養生後におけるクラックの発生状況を観察した結果を
下記の表−１に示す。Table 1 below shows the results of observing the state of crack generation before autoclave curing and after autoclave curing for each of the lightweight cellular concrete panels according to the above Examples and Comparative Examples.
この表で、○はクラックの発生がない、×は極僅かの
クラックの発生が見られる、××はクラックの発生が顕
著である（クラックの幅0.2mm以上）をそれぞれ示す。 In this table, ◯ indicates that no cracks were generated, x indicates that very slight cracks were observed, and xx indicates that cracks were significantly generated (crack width 0.2 mm or more).
この表より、実施例に係る各軽量気泡コンクリートパ
ネルの製造方法によれば、セメントラテックス系防錆剤
を鉄筋に塗装した後、このセメントラテックス系防錆剤
の上に防水剤を塗装したことにより、セメントラテック
ス系防錆剤への水分の移行を阻止して、オートクレーブ
養生前と養成後のいずれにおいてもクラックの発生が見
られないことがわかる。From this table, according to the manufacturing method of each lightweight cellular concrete panel according to the example, after coating the cement latex-based rust preventive agent on the reinforcing bar, by applying a waterproofing agent on the cement latex-based rust preventive agent It can be seen that the migration of water to the cement latex-based rust preventive agent is prevented, and no crack is observed before or after curing in the autoclave.
また、オートクレーブ養生前にクラック防止のために
パネルを強化する必要がなく、強度が弱いままオートク
レーブ養生を行うので、この養成によってパネルの強化
が理想的に進み、充分な強度を有するパネルが得られ
る。In addition, since it is not necessary to strengthen the panel to prevent cracking before autoclave curing, autoclave curing is performed with weak strength, so this strengthening of the panel ideally progresses and a panel with sufficient strength can be obtained. .
更に、鉄筋に防錆塗装を２回施しているので、鉄筋の
エッジ部や溶接部位のように塗装されにくい部分にも均
一な厚さで防錆剤の塗膜を形成することができる。Further, since the rust-preventive coating is applied to the reinforcing bar twice, it is possible to form a coating film of the rust-preventive agent with a uniform thickness even on a portion of the reinforcing bar which is difficult to be coated such as an edge portion or a welded portion.
これに対して、比較例１によれば、セメントラテック
ス系防錆剤を鉄筋に塗装した後、このセメントラテック
ス系防錆剤の上に防水剤を塗装していないため、セメン
トラテックス系防錆剤に水分が移行して、オートクレー
ブの養生前と養成後のいずれにおいてもクラックが発生
する。On the other hand, according to Comparative Example 1, since the cement latex-based rust preventive agent is applied to the reinforcing bar and the waterproof agent is not applied on the cement latex-based rust preventive agent, the cement latex-based rust preventive agent is not applied. The water migrates to and cracks occur both before and after curing the autoclave.
また、比較例２によれば、セメントラテックス系防錆
剤を鉄筋に塗装した後、このセメントラテックス系防錆
剤の上にシリコン樹脂系塗料を塗装しているが、この塗
料がオートクレーブ養生中に劣化し、防水性がなくなる
ため、オートクレーブ前のクラックの発生は防げても、
オートクレーブ養生後にはセメントラテックス系防錆剤
に水分が移行して、クラックが発生する。Further, according to Comparative Example 2, after the cement latex rust preventive agent is applied to the reinforcing bar, the silicone resin varnish is applied on the cement latex rust preventive agent. This paint is used during autoclave curing. Since it deteriorates and loses its waterproofness, it is possible to prevent the occurrence of cracks before autoclaving,
After curing in the autoclave, water migrates to the cement latex-based rust preventive and cracks occur.
なお、上記実施例は、軽量気泡コンクリートパネルを
例に本発明の製造方法を説明したが、気泡コンクリート
製品の具体例は任意である。In addition, although the said Example demonstrated the manufacturing method of this invention taking the lightweight aerated concrete panel as an example, the specific example of an aerated concrete product is arbitrary.
［発明の効果］ 本発明によれば、セメントラテックス系防錆剤が塗装
された鉄筋が埋設された気泡コンクリート製品の製造に
おいて、クラックの発生を防止することができ、これに
より良好な品質を有する気泡コンクリート製品が得られ
る。[Effect of the Invention] According to the present invention, it is possible to prevent the occurrence of cracks in the production of an aerated concrete product in which a reinforcing bar coated with a cement latex-based rust preventive is buried, and thus, good quality can be obtained. An aerated concrete product is obtained.
Claims (1)
鉄筋が埋設された気泡コンクリート製品の製造方法にお
いて、 セメントラテックス系防錆剤を鉄筋に塗装する工程と、 前記セメントラテックス系防錆剤の上に防水剤を塗装す
る工程と、 前記鉄筋を成形用型枠内に配置して気泡が混入されたコ
ンクリートスラリーを打設する工程と、 を有することを特徴とする気泡コンクリート製品の製造
方法。1. A method for producing an aerated concrete product in which a reinforcing bar coated with a cement latex rust preventive is embedded, wherein a step of coating the cement latex rust preventive on the reinforcing bar, A method for producing an aerated concrete product, comprising: a step of applying a waterproofing agent on the top; and a step of placing the reinforcing bar in a molding frame and placing a concrete slurry in which bubbles are mixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29936589A JPH0825199B2 (en) | 1989-11-17 | 1989-11-17 | Aerated concrete product manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29936589A JPH0825199B2 (en) | 1989-11-17 | 1989-11-17 | Aerated concrete product manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03159704A JPH03159704A (en) | 1991-07-09 |
| JPH0825199B2 true JPH0825199B2 (en) | 1996-03-13 |
Family
ID=17871615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29936589A Expired - Lifetime JPH0825199B2 (en) | 1989-11-17 | 1989-11-17 | Aerated concrete product manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0825199B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0977574A (en) * | 1995-07-08 | 1997-03-25 | Toto Ltd | Concrete structure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013233767A (en) * | 2012-05-10 | 2013-11-21 | Sumitomo Metal Mining Siporex Kk | Method for manufacturing reinforcement for light weight cellular concrete |
-
1989
- 1989-11-17 JP JP29936589A patent/JPH0825199B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0977574A (en) * | 1995-07-08 | 1997-03-25 | Toto Ltd | Concrete structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03159704A (en) | 1991-07-09 |
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