JP3442104B2 - Manufacturing method of lightweight cellular concrete - Google Patents
Manufacturing method of lightweight cellular concreteInfo
- Publication number
- JP3442104B2 JP3442104B2 JP14942993A JP14942993A JP3442104B2 JP 3442104 B2 JP3442104 B2 JP 3442104B2 JP 14942993 A JP14942993 A JP 14942993A JP 14942993 A JP14942993 A JP 14942993A JP 3442104 B2 JP3442104 B2 JP 3442104B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- lightweight cellular
- cellular concrete
- water
- product
- 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
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Producing Shaped Articles From Materials (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は例えば籠状の鉄筋やラス
金網等の補強筋を埋設した軽量気泡コンクリートの製造
方法に関するものである。
【０００２】
【従来の技術】セメント、石灰石、珪石、石膏等を主原
料とする軽量気泡コンクリート用原料に発泡剤と水を加
えて混合した泥状の原料スラリー（以下スラリーとい
う）を所定の位置に籠状の鉄筋やラス金網等の補強筋を
セットした型枠内に注入して発泡させ、スラリーを硬化
させてモルタル状にし、硬化したモルタルをカッターで
切断し、オートクレーブで養生させて軽量気泡コンクリ
ートが製造されている。このように製造された製品にお
いて、一般に均一な小粒径の気泡を有する製品とするこ
とは困難であり、製品の端面に３ｍｍを超える孔が観測
され、補強筋より外側のコンクリート部の圧縮強度が劣
り、端部が欠け易い等の現象を生じていた。
【０００３】この点を向上させるために、特開平１ー１
０００７２号公報では、特定の水溶性セルロースを添加
することにより気泡径を３ｍｍ以下とする技術が提案さ
れている。
【０００４】
【発明が解決しようとする課題】特開平１ー１０００７
２号公報に開示された技術に従うと、得られる軽量気泡
コンクリート製品の気泡径が３ｍｍ以下になり、製品の
端面にも大きな孔は存在しなくなるが、補強筋の上部に
シャドウ（空洞部）が存在し、そのために補強筋より外
側のコンクリート部の圧縮強度が低下する。
【０００５】本発明の目的は、一般に均一な小粒径の気
泡を有すると共にこのようなシャドウの発現を減少さ
せ、外観意匠的に更に見栄えがよく、コンクリート部の
圧縮強度低下を生じない軽量気泡コンクリートの製造方
法を提供することである。
【０００６】
【課題を解決するための手段】本発明は、軽量気泡コン
クリートの製造方法において、セメント、石灰石、珪
石、石膏等を主原料とする軽量気泡コンクリート用原料
に発泡剤と水を加えて、その固形分に対して０．００１
以上０．０５重量％以下の水溶性セルロースと０.０５
以上１.５重量％以下（４０重量％の溶液重量として）
のメラミンスルフォン酸ホルマリン縮合物の減水剤を含
む原料スラリーを、所定の位置に籠状の鉄筋やラス金網
の補強筋をセットした型枠内に注入して発泡させ、その
後オートクレーブ養生することを特徴とするものであ
る。
【０００７】本発明に使用する水溶性セルロースとして
は、メチルセルロース、エチルセルロース、メチルエチ
ルセルロース、ヒドロキシメチルセルロース、ヒドロキ
シエチルセルロース、ヒドロキシプロピルメチルセルロ
ース、カルビキシメチルセルロース等の水溶性セルロー
スがあり、メチルセルロースのメトキシ基の８４〜９３
％をヒドロキシプロポキシ基に置換したもの等も含まれ
る。
【０００８】これらの水溶性セルロースの使用量は、適
当な粘度を与える範囲に選定するために、スラリーの固
形分に対して０．００１重量％以上０． ０５重量％以
下添加することが必要である。更に本発明ではメラミン
スルフォン酸ホルマリン縮合物の減水剤を併用する必要
がある。このメラミンスルフォン酸ホルマリン縮合物の
減水剤を使用すると型枠への注入時のスラリー粘度を適
度なものとすることができ、得られる軽量気泡コンクリ
ート製品の気泡径を小さくすると共に、鉄筋の上部のシ
ャドウ（空洞部）発生を有効に防止することができる。
そのため、鉄筋より外側のコンクリート部の圧縮強度も
低下しない。
【０００９】このメラミンスルフォン酸ホルマリン縮合
物の減水剤としては、例えば花王（株）製の商品名（マ
イティ１５０Ｖ−２、但し、４０重量％溶液）として市
販されているものを使用でき、その添加量は前記スラリ
ーの固形分に対して０．０５重量％以上１．５重量％以
下（前記４０重量％の溶液重量として）である必要があ
る。添加量が０．０５重量％未満であると、添加効果が
発揮されにくくなり、また１．５重量％ を越えると粘
度が一定値以下には低下しない傾向がある。
【００１０】なお本発明におけるメラミンスルフォン酸
ホルマリン縮合物は、スルフォン化メラミンとホルマリ
ンを縮合反応せしめて得られたものである。次に実施例
を示し、本発明をより詳細に説明する。
【００１１】
【実施例】実施例１
セメント３０重量％、生石灰８重量％、珪石３６重量
％、石膏２重量％、軽量気泡コンクリートの解砕屑２４
重量％の割合からなる混合物１００重量部に水７０重量
部と金属アルミ粉状物０．０６重量部とヒドロキシプロ
ピルセルロース（信越化学（株）製の商品名：ｈｉメト
ローズ６０ＳＨ−４０００、ゲル化する温度は５０℃）
を固形分で０．０１重量部、市販のメラミンスルフォン
酸ホルマリン縮合物の減水剤（花王（株）製の商品名：
マイティ１５０Ｖ−２、但し、この商品の固形割合は４
０重量％）を０．３重量部加えて混練したものを軽量気
泡コンクリート用の原料スラリーとして使用し、この混
練直後の組成物を籠状の補強筋を多数垂直に配置した型
枠内に注入した。このときの注入スラリーの温度は５２
℃であった。
【００１２】このようにして得られた軽量気泡コンクリ
ートパネル製品中の気泡径は２ｍｍ以下であり、２ｍｍ
を超える径の気泡は残存しなかった。また切断した際も
補強筋の周囲にはシャドウ（空洞部）は目立たなく、パ
ネル端面側の補強筋の垂直上部の圧縮強度は５１．８ｋ
ｇ／ｃｍ2 であった。これに対し、ヒドロキシプロピル
セルロースのみを添加し、メラミンスルフォン酸ホルマ
リン縮合物の減水剤を添加しなかった場合は、２ｍｍを
超える径の気泡が１ｍ2 当たり５０個以上存在し、パネ
ルを切断すると補強筋の周囲にはシャドウ（空洞部）が
あり、パネル端面側の補強筋の垂直上部の圧縮強度は４
９．７ｋｇ／ｃｍ2 と低い値であった。
【００１３】比較例１
実施例１のメラミンスルフォン酸ホルマリン縮合物の減
水剤の代わりに、ナフタレンスルフォン酸塩の減水剤で
ある花王（株）の商品名マイティ１５０を０．３重量部
添加して、実施例１と同様にして軽量気泡コンクリート
パネルを製造した。このパネルには２ｍｍを超える径の
気泡が１ｍ2 当たり５０個以上存在し、パネルを切断す
ると補強筋の周囲にはシャドウ（空洞部）があり、パネ
ル端面側の補強筋の垂直上部の圧縮強度は４６．２ｋｇ
／ｃｍ2 と低い値であった。
【００１４】
【発明の効果】本発明の製造法によれば次の効果を発揮
する。
型枠への注入時の空気の巻き込みや発泡した泡の合
一等による大きな気泡の発生がなくなり、得られる製品
中に２ｍｍを超える径の気泡が存在せず、製品全体の圧
縮強度が高くなる。
また、補強筋の上部や製品の側面にシャドウ（空洞
部）が現れなくなり、外観意匠的にも製品の見栄えが更
に良くなる。
上記のに示したように製品中の気泡が均一に細か
くなり、シャドウ（空洞部）が無くなることにより、特
に製品の端面側の補強筋の垂直上部の圧縮強度が向上す
る。
なお、製品表面にアクリル樹脂系の塗装材等を用い
てスプレーや刷毛等により薄く塗膜を形成しても、塗膜
切れやムラ等を生じることがない。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing lightweight cellular concrete in which reinforcing bars such as basket-shaped reinforcing bars and lath wire mesh are embedded. 2. Description of the Related Art A muddy raw material slurry (hereinafter referred to as a slurry) obtained by adding a foaming agent and water to a raw material for lightweight cellular concrete mainly composed of cement, limestone, silica stone, gypsum, etc. It is poured into a mold set with reinforcing bars such as basket-shaped reinforcing bars and lath wire mesh, foamed, and the slurry is hardened to form a mortar. Concrete is being manufactured. Generally, it is difficult to produce a product having uniform small-sized air bubbles in the product manufactured as described above. A hole exceeding 3 mm is observed on the end face of the product, and the compressive strength of the concrete portion outside the reinforcing bar is observed. Inferior, and phenomena such as easy chipping of the ends. In order to improve this point, Japanese Patent Laid-Open Publication No. 1-1
Japanese Patent Application Publication No. 000072 proposes a technique of adding a specific water-soluble cellulose to reduce the bubble diameter to 3 mm or less. [0004] Japanese Patent Application Laid-Open No. 1-10007 / 1999
According to the technology disclosed in Japanese Patent Publication No. 2 (1993), the cell diameter of the obtained lightweight cellular concrete product becomes 3 mm or less, and there is no longer a large hole at the end face of the product. However, a shadow (hollow portion) is formed above the reinforcing bars. Present, which reduces the compressive strength of the concrete part outside the reinforcement. SUMMARY OF THE INVENTION It is an object of the present invention to provide a light-weight cell which generally has uniform small-sized cells, reduces the appearance of such shadows, has a better appearance, and does not cause a decrease in compressive strength of a concrete part. It is to provide a method for producing concrete. SUMMARY OF THE INVENTION The present invention relates to a method for producing lightweight cellular concrete, which comprises adding a foaming agent and water to a raw material for lightweight cellular concrete mainly composed of cement, limestone, silica stone, gypsum and the like. 0.001 based on the solid content
Not less than 0.05% by weight of water-soluble cellulose and 0.05
1.5% by weight or less (as a solution weight of 40% by weight)
The raw material slurry containing the water-reducing agent of melamine sulfonate formalin condensate is injected into a mold in which a cage-shaped reinforcing bar or a reinforcing wire of a lath wire mesh is set, foamed, and then autoclaved. It is assumed that. The water-soluble cellulose used in the present invention includes water-soluble cellulose such as methylcellulose, ethylcellulose, methylethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose and carboxymethylcellulose.
% Is substituted with a hydroxypropoxy group. The amount of the water-soluble cellulose used is 0.001% by weight or more with respect to the solid content of the slurry in order to select an appropriate viscosity. It is necessary to add not more than 05% by weight. Further, in the present invention, it is necessary to use a water reducing agent for melamine sulfonic acid formalin condensate in combination. By using this melamine sulfonate formalin condensate water reducing agent, the slurry viscosity at the time of pouring into a mold can be made appropriate, and the cell diameter of the obtained lightweight cellular concrete product can be reduced, and the upper part of the reinforcing bar can be reduced. Shadow (cavity) generation can be effectively prevented.
Therefore, the compressive strength of the concrete portion outside the reinforcing bar does not decrease. As the water reducing agent for the melamine sulfonic acid formalin condensate, for example, those commercially available under the trade name (Mighty 150V-2, 40% by weight solution) manufactured by Kao Corporation can be used, The amount must be 0.05% by weight or more and 1.5% by weight or less (as the solution weight of 40% by weight) based on the solid content of the slurry. If the amount is less than 0.05% by weight, the effect of the addition becomes difficult to exert, and if it exceeds 1.5% by weight, the viscosity does not tend to decrease below a certain value. The melamine sulfonate formalin condensate according to the present invention is obtained by subjecting a sulfonated melamine and formalin to a condensation reaction. Next, the present invention will be described in more detail with reference to Examples. Example 1 30% by weight of cement, 8% by weight of quicklime, 36% by weight of silica, 2% by weight of gypsum, crushed debris of lightweight cellular concrete 24
70 parts by weight of water, 0.06 parts by weight of metal aluminum powder and hydroxypropylcellulose (trade name: Hi Metroose 60SH-4000, manufactured by Shin-Etsu Chemical Co., Ltd.) are gelled in 100 parts by weight of a mixture having a weight ratio of 100% by weight. (The temperature is 50 ° C)
With a solid content of 0.01 part by weight, a commercially available water reducing agent for melamine sulfonic acid formalin condensate (trade name by Kao Corporation:
Mighty 150V-2, but the solids ratio of this product is 4
(0% by weight) and kneaded, and used as a raw material slurry for lightweight cellular concrete. The composition immediately after kneading is poured into a mold in which a plurality of cage-shaped reinforcing bars are vertically arranged. did. The temperature of the injection slurry at this time was 52
° C. [0012] The cell diameter of the lightweight cellular concrete panel product thus obtained is 2 mm or less.
Did not remain. Also, when cut, shadows (cavities) are not conspicuous around the reinforcing bars, and the compressive strength of the vertical upper portion of the reinforcing bars on the panel end surface side is 51.8 k.
g / cm 2 . In contrast, the addition of only hydroxypropyl cellulose, and if not adding the water-reducing agent of melamine sulfonic acid formaldehyde condensate, gas bubbles having a diameter greater than 2mm is present more than 50 per 1 m 2, cutting the panel reinforcement There is a shadow (hollow part) around the streaks, and the compressive strength of the vertical upper part of the reinforcing bars on the panel end face side is 4
The value was as low as 9.7 kg / cm 2 . Comparative Example 1 Instead of the water reducing agent for melamine sulfonate formalin condensate of Example 1, 0.3 part by weight of Kao Corporation's trade name Mighty 150 which is a water reducing agent for naphthalene sulfonate was added. A lightweight cellular concrete panel was manufactured in the same manner as in Example 1. In this panel, there are more than 50 bubbles with a diameter of more than 2 mm per 1 m 2, and when the panel is cut, there is a shadow (cavity) around the reinforcing bar, and the compressive strength in the vertical upper part of the reinforcing bar on the panel end face side Is 46.2kg
/ Cm 2 . According to the production method of the present invention, the following effects are exhibited. Elimination of large bubbles due to entrainment of air at the time of injection into the mold or union of foamed bubbles is eliminated, and bubbles having a diameter exceeding 2 mm do not exist in the obtained product, and the compressive strength of the entire product is increased. . In addition, shadows (cavities) do not appear on the upper portions of the reinforcing bars or on the side surfaces of the product, and the appearance of the product is further improved in appearance and design. As shown in the above, the bubbles in the product are uniformly fine, and the shadow (cavity) is eliminated, so that the compressive strength particularly at the vertical upper portion of the reinforcing bar on the end face side of the product is improved. Even if a thin coating film is formed on the product surface by spraying, brushing or the like using an acrylic resin-based coating material or the like, the coating film will not be cut or uneven.
Claims (1)
とする軽量気泡コンクリート用原料に発泡剤と水を加え
て、その固形分に対して０．００１以上０．０５重量％
以下の水溶性セルロースと０.０５以上１.５重量％以下
（４０重量％の溶液重量として）のメラミンスルフォン
酸ホルマリン縮合物の減水剤を含む原料スラリーを、所
定の位置に籠状の鉄筋やラス金網の補強筋をセットした
型枠内に注入して発泡させ、その後オートクレーブ養生
することを特徴とする軽量気泡コンクリートの製造方
法。(57) [Claims] [Claim 1] A foaming agent and water are added to a raw material for lightweight cellular concrete mainly composed of cement, limestone, silica stone, gypsum, etc., and 0.001 to the solid content thereof. More than 0.05% by weight
A raw material slurry containing the following water-soluble cellulose and a water reducing agent of 0.05 to 1.5% by weight (as a solution weight of 40% by weight) of a melaminesulfonic acid formalin condensate is placed in a predetermined position in a cage-like reinforcing steel or the like. A method for producing lightweight cellular concrete, characterized by injecting into a form in which reinforcing bars of a lath wire mesh are set, foaming, and then autoclaving.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14942993A JP3442104B2 (en) | 1993-06-21 | 1993-06-21 | Manufacturing method of lightweight cellular concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14942993A JP3442104B2 (en) | 1993-06-21 | 1993-06-21 | Manufacturing method of lightweight cellular concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0710652A JPH0710652A (en) | 1995-01-13 |
| JP3442104B2 true JP3442104B2 (en) | 2003-09-02 |
Family
ID=15474921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14942993A Expired - Lifetime JP3442104B2 (en) | 1993-06-21 | 1993-06-21 | Manufacturing method of lightweight cellular concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3442104B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101276166B1 (en) * | 2011-03-24 | 2013-06-18 | 한국세라믹기술원 | Autoclaved light weight concrete composition including the thermosetting resin |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005033454A1 (en) * | 2005-07-18 | 2007-01-25 | Construction Research & Technology Gmbh | Use of an organic additive for the production of aerated concrete |
| CN109305786A (en) * | 2018-09-07 | 2019-02-05 | 怀宁建国混凝土制品有限责任公司 | A kind of high-strength cracking-resistant foamed cement |
| CN109265112A (en) * | 2018-09-07 | 2019-01-25 | 怀宁建国混凝土制品有限责任公司 | A kind of low water suction foamed cement |
| CN109231943A (en) * | 2018-09-13 | 2019-01-18 | 怀宁建国混凝土制品有限责任公司 | A kind of high tenacity foamed cement and preparation method thereof |
| CN109279834A (en) * | 2018-09-13 | 2019-01-29 | 怀宁建国混凝土制品有限责任公司 | A kind of shock resistance waterproof foamed cement and preparation method thereof |
| CN109293298A (en) * | 2018-09-13 | 2019-02-01 | 怀宁建国混凝土制品有限责任公司 | A kind of waterproof toughening foamed cement and preparation method thereof |
| CN109293297A (en) * | 2018-09-13 | 2019-02-01 | 怀宁建国混凝土制品有限责任公司 | A kind of low-density foamed cement and preparation method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63129082A (en) * | 1986-11-18 | 1988-06-01 | 株式会社間組 | Aluminum powder for cement composition |
| JP2571083B2 (en) * | 1987-12-16 | 1997-01-16 | 大成建設株式会社 | Resin-forming foam cell composition |
| JPH0645511B2 (en) * | 1989-03-20 | 1994-06-15 | 三洋化成工業株式会社 | Foaming agents and compositions for cellular concrete |
-
1993
- 1993-06-21 JP JP14942993A patent/JP3442104B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101276166B1 (en) * | 2011-03-24 | 2013-06-18 | 한국세라믹기술원 | Autoclaved light weight concrete composition including the thermosetting resin |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0710652A (en) | 1995-01-13 |
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