JPH0319806A - Centrifugal forming method of lightweight concrete manufacture - Google Patents

Centrifugal forming method of lightweight concrete manufacture

Info

Publication number
JPH0319806A
JPH0319806A JP15484089A JP15484089A JPH0319806A JP H0319806 A JPH0319806 A JP H0319806A JP 15484089 A JP15484089 A JP 15484089A JP 15484089 A JP15484089 A JP 15484089A JP H0319806 A JPH0319806 A JP H0319806A
Authority
JP
Japan
Prior art keywords
concrete
lightweight
lightweight aggregate
aggregate
centrifugal force
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
Application number
JP15484089A
Other languages
Japanese (ja)
Other versions
JPH0515524B2 (en
Inventor
Tadao Sugimoto
杉本 忠男
Kenji Ando
安藤 兼治
Nobuhiko Hayashi
林 信彦
Takashi Amano
天野 孝
Yasutomi Aikou
愛甲 安富
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chubu Electric Power Co Inc
Tokai Concrete Industries Co Ltd
Original Assignee
Chubu Electric Power Co Inc
Tokai Concrete Industries Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Chubu Electric Power Co Inc, Tokai Concrete Industries Co Ltd filed Critical Chubu Electric Power Co Inc
Priority to JP15484089A priority Critical patent/JPH0319806A/en
Publication of JPH0319806A publication Critical patent/JPH0319806A/en
Publication of JPH0515524B2 publication Critical patent/JPH0515524B2/ja
Granted legal-status Critical Current

Links

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  • Producing Shaped Articles From Materials (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Abstract

PURPOSE:To produce lightweight concrete manufacture by a method wherein concrete, which dispersedly contains an infinite number of bubbles, is produced by kneading cement, water, lightweight and frother or blowing agent, so as to pour it in a form for centrifugal forming. CONSTITUTION:The specific gravity of concrete, which dispersedly contains an infinite number of bubbles produced by frother or blowing agent, is made to be nearly equal to the specific gravity of lightweight aggregate by reducing the specific gravity of the concrete component excluding the lightweight aggregate through the dispersed inclusion of the bubbles in the concrete. Accordingly, in the concrete, which is centrifugally formed in a form, no separation from the lightweight aggregate from the concrete component excluding the lightweight aggregate occurs, resulting in allowing to produce homogeneous lightweight concrete manufacture, which dispersedly contains the lightweight aggregate.

Description

【発明の詳細な説明】 く産業上の利川分野〉 本発明は、軽量骨材を含有する軽量コンクリート製品を
遠心力成形する方法に関する.く従来の技術〉 コンクリート製品の軽量化を図る場合、砂利のような普
通骨材に代えて、膨張頁岩を焼威して膨張させて製造し
た多孔質の人工軽楚骨材のような軽量骨材を使用して,
軽量骨材を含有する軽量コンクリート製品を戊形するこ
とがある。
[Detailed Description of the Invention] Industrial Field> The present invention relates to a method for centrifugally forming lightweight concrete products containing lightweight aggregate. Conventional technology> When trying to reduce the weight of concrete products, instead of using ordinary aggregates such as gravel, it is necessary to use lightweight aggregates such as porous artificial light aggregates made by burning and expanding expanded shale. using materials,
Lightweight concrete products containing lightweight aggregates may be shaped.

しかし、遠心力威形するコンクリート製品について軽量
化を図る場合は,普通骨材に代えて、軽量骨材を使用し
て、軽量骨材を含有する軽−丑コンクリート製品を遠心
力成形する、ということは行なわれていない. く発明が解決しようとする課題〉 遠心力成形用の円筒状の型枠に、軽量骨材を含イfする
コンクリートを注入し、円筒状の型枠をその中心軸の回
りに回転して,型枠内の軽jt骨材を含有するコンクリ
ートを円筒状に遠心力成形すると、型枠の回転に基く遠
心力によって、型枠内において、コンクリート中の比重
の小さい軽量骨材と、軽量骨材以外の比重の大きいコン
クリート成分が分離し、比重の小さい軽量骨材が円筒状
コンクリート成形体の内周面側に集中し、円筒状コンク
リート成形体の外周面側じ軽量骨材が配置されない. 従って,遠心力成形された円筒状コンクリート或形体は
、軽量骨材が特定の個所に集中して全体に分散していな
いので、物理的及び化学的な性質が均一にならない. 即ち、軽量骨材を含有する均質な軽量コンクリト製品を
遠心力成形することができない.本発明の目的は、上記
のような従来の課題を解決することである. く課題を解決するための手段〉 本発明者は、軽量骨材を含有するコンクリートを遠心力
成形すると、軽量骨材が特定の個所に集中して全体に分
散しない原因は、軽量骨材の比重が軽量骨材以外のコン
クリート成分の比重よりも相当小さいことに起因してい
る点に着眼し、軽量骨材と軽量骨材以外のコンクリート
戒分の比重を同程度にすることを考察した. ここで、軽量骨材の比重を増加させることと、軽量骨材
以外のコンクリート威分の比重を低減することが考えら
れるが、軽量骨材の比重を増加させることは、コンクリ
ート製品の軽量化を図る趣旨に反するので、軽量骨材以
外のコンクリート成分の比重を低減することを考察する
必要がある.そこで、コンクリートを混練りする際、起
泡剤又は発泡剤を添加して、コンクリート中に無数の気
泡を分散し−Ce!,Mし、コンクリートが無数の気泡
を分散して含有することによって、軽量骨材以外のコン
クリート戒分の比重を低減することを考え付いたのであ
る. 即ち、本発明は、セメント,水と軽量骨材及び起泡剤又
は発泡剤を練り混ぜて、無数の気泡を分散して含有する
コンクリートを生産し、このコンクリートを遠心力成形
用の型枠に注入し,型枠を回転して、型枠内のコンクリ
ートを遠心力威形し、 軽量骨材を分散して含有する軽量コンクリート製品を生
産することを特徴とする軽量コンクリート製品の遠心力
成形法である. く作 用〉 本発明の軽量コンクリート製品の遠心力成形法において
は、起泡剤又は発泡剤によって生或した無数の気泡を分
散して含有するコンクリートが遠心力成形される. そのコンクリートは,無数の気泡を分散して含イ■する
ことによって、軽量骨材以外のコンクリート成分の比重
が低減して軽量骨材の比重に近くなっている. 従って、型枠内で遠心力威形されるコンクリートは、型
枠の回転に基く遠心力によって、軽量骨材と軽量骨材以
外のコンクリート成分に分離しない. く発明の効果〉 本発明の軽量コンクリート製品の遠心力成形法において
は、型枠内で遠心力成形されるコンクリートは、型枠の
回転に基〈遠心力によって、軽量骨材と軽量骨材以外の
コンクリート成分に分離しないので、軽量骨材を分散し
て含有する軽量コンクリート製品が生産される. この遠心力軽量コンクリート製品は、軽量骨材を分散し
て含有しているので、軽量骨材を特定の個所に集中して
含有している場合に比較して、均質になる. 即ち、本発明の軽量コンクリート製品の遠心力戒形法に
おいては、軽量骨材を分散して含有する均質な軽量コン
クリート製品を遠心力成形することができる. く実施例〉 本例の軽量コンクリート製品の遠心力成形法においては
、先ず,材料のセメント,水.細骨材の砂,粗骨材の軽
量骨材と、減水剤、及び、起泡剤を練り混ぜて、無数の
気泡を分散して含有する気泡生コンクリートを生産する
However, when trying to reduce the weight of concrete products that are subject to centrifugal force, it is recommended to use lightweight aggregate instead of ordinary aggregate and centrifugally form light concrete products containing lightweight aggregate. That has not been done. Problems to be Solved by the Invention> Concrete containing lightweight aggregate is poured into a cylindrical form for centrifugal force forming, and the cylindrical form is rotated around its central axis. When concrete containing light JT aggregate in the formwork is centrifugally formed into a cylindrical shape, the light aggregate with a low specific gravity in the concrete and the light aggregate are separated in the formwork by centrifugal force based on the rotation of the formwork. Concrete components with high specific gravity other than the above are separated, lightweight aggregate with low specific gravity is concentrated on the inner circumferential side of the cylindrical concrete formed body, and lightweight aggregate is not placed on the outer circumferential side of the cylindrical concrete formed body. Therefore, in a cylindrical concrete shape formed by centrifugal force, the lightweight aggregate is concentrated in a specific area and not dispersed throughout, so the physical and chemical properties are not uniform. In other words, homogeneous lightweight concrete products containing lightweight aggregate cannot be formed by centrifugal force. The purpose of the present invention is to solve the conventional problems as described above. Means for Solving the Problems> The present inventor has discovered that when concrete containing lightweight aggregate is formed by centrifugal force, the reason why the lightweight aggregate concentrates in specific areas and is not dispersed throughout is due to the specific gravity of the lightweight aggregate. Focusing on the fact that the specific gravity of concrete components other than lightweight aggregate is considerably lower than that of concrete components other than lightweight aggregate, we considered making the specific gravity of lightweight aggregate and concrete components other than lightweight aggregate about the same. Here, it is possible to increase the specific gravity of lightweight aggregate and reduce the specific gravity of concrete components other than lightweight aggregate, but increasing the specific gravity of lightweight aggregate will reduce the weight of concrete products. Since this goes against the purpose of this study, it is necessary to consider reducing the specific gravity of concrete components other than lightweight aggregate. Therefore, when mixing concrete, a foaming agent or foaming agent is added to disperse countless air bubbles in the concrete. , M, and came up with the idea of reducing the specific gravity of concrete materials other than lightweight aggregate by making concrete contain countless air bubbles dispersed. That is, the present invention produces concrete containing dispersed countless air bubbles by mixing cement, water, lightweight aggregate, and foaming agent, and then molding this concrete into a formwork for centrifugal force forming. A centrifugal force forming method for lightweight concrete products, which is characterized by producing a lightweight concrete product containing dispersed lightweight aggregate by pouring and rotating the formwork to apply centrifugal force to the concrete in the formwork. It is. Effect> In the centrifugal force forming method for lightweight concrete products of the present invention, concrete containing dispersed countless air bubbles generated by a foaming agent or foaming agent is centrifugally formed. By dispersing and containing countless air bubbles in this concrete, the specific gravity of concrete components other than lightweight aggregate is reduced and becomes close to that of lightweight aggregate. Therefore, concrete that is subjected to centrifugal force within the formwork does not separate into lightweight aggregate and concrete components other than lightweight aggregate due to the centrifugal force caused by the rotation of the formwork. Effects of the Invention In the centrifugal force forming method for lightweight concrete products of the present invention, the concrete that is centrifugally formed in the formwork is separated into lightweight aggregates and non-lightweight aggregates by centrifugal force due to the rotation of the formwork. Since the concrete components do not separate into concrete components, lightweight concrete products containing dispersed lightweight aggregates are produced. Since this centrifugal lightweight concrete product contains lightweight aggregate in a dispersed manner, it is more homogeneous than when the lightweight aggregate is concentrated in a specific area. That is, in the centrifugal force shaping method of lightweight concrete products of the present invention, homogeneous lightweight concrete products containing dispersed lightweight aggregate can be centrifugally shaped. Example> In the centrifugal force forming method of lightweight concrete products in this example, first, the materials cement and water are used. By mixing sand as a fine aggregate, lightweight aggregate as a coarse aggregate, a water reducing agent, and a foaming agent, a cellular ready-mixed concrete containing numerous dispersed air bubbles is produced.

上記の粗骨材の軽量骨材は、膨張頁岩を焼成して膨張さ
せて製造した多孔質の人工軽量骨材であり,絶乾比重が
1.5未満である.この粗骨材の軽量骨材の最大粒径は
,15mmである.上記の起泡剤は、界面活性作用によ
って生コンクリート中に気泡を物理的に導入させるもの
である.加水分解蛋白系の起泡剤である.更に具体的に
は、「グリフォーム」の商品名で市販されている起泡剤
である. 上記の各材料のコンクリー}1m3当りの重量(Kg)
は、次の通りである. セメント    ・    460 水                171細骨材の砂
   :  1,023 粗骨材の軽量骨材 :   532 減水剤          3.68 起泡剤          1.2 なお,水セメント比は、37%位である.上記の気泡生
コンクリートは、含有空気の容積割合が20%位であり
、気泡の径が0.2〜is層位である. また、上記の気泡生コンクリートは、無数の気泡を分散
して含有することによって、軽量骨材以外のコンクリー
トa分の比重が低減して軽量骨材の比重に近くなってい
る. 次に、上記の気泡生コンクリートは,遠心力成形用の円
筒状の型枠に注入し、円筒状の型枠をその中心軸の回り
に回転して、型枠内のコンクリートを円筒状に遠心力威
形する. この遠心力戊形工程においては、第1工程の3分間は、
型枠を5 1 6 rpmで回転して、型枠内のコンク
リートにIOCの遠心力を加え、第2工程の3分間は、
型枠を7 3 O rpmで回転して、型枠内のコンク
リートに20Gの遠心力を加え,最後の第3工程の9分
間は、型枠を1,032rpmで回転して、型枠内のコ
ンクリートに40Gの遠心力を加える. 遠心力成形工程において、型枠内で遠心力成形されるコ
ンクリートは、型枠の回転に基く遠心力によって,含有
空気の一部が外部に放出される.しかし、軽量骨材と軽
量骨材以外のコンクリート威分に分離することはない. 遠心力成形工程の終了後、遠心力成形された円筒状コン
クリート成形体は、蒸気養生して硬化させ,円筒状の軽
量コンクリート製品とする.この円筒状の軽量コンクリ
ート製品は、粗骨材の軽量骨材を分散して含有しており
、均質になっている. また、含有空気の容m割合がlO%位であり、比重が1
.8位である.従って、軽量骨材を含有していない普通
のコンクリート製品の比重が2.3位であるので、相当
の軽量になっている.更に、圧縮強度が4 0 0 K
gf/cm2位である.従って、遠心力威形しない普通
の軽量コンクリート製品に比較して、圧縮強度が高い. 上記の円筒状の軽量コンクリート製品は、蔓棚の柱や建
造物の柱又は流体を流す管として使用される. く変形例〉 1)軽量骨材に、膨張粘土を焼成して膨張させて製造し
た多孔質の人工軽量骨材、又は、フライアッシュを焼き
固めて製造した多孔質の人工軽量骨材を用いる. 2)細骨材に、軽量骨材を用いる. 3)起泡剤に、合威界面活性剤系の起泡剤、又は、樹脂
せっけん系の起泡剤を用いる.4)起泡剤に代えて又は
起泡剤と共に、発泡剤を用いる. 発泡剤は,化学反応によって生コンクリート中に気泡を
発生させるものである.例えば、金属アルミニウム粉末
の発泡剤である. 5)減水剤に代えて又は減水剤と共に、AE減水剤又は
AE剤を用いる. 特詐出關人 中部電力株式会社
The lightweight coarse aggregate mentioned above is a porous artificial lightweight aggregate manufactured by firing and expanding expanded shale, and has an absolute dry specific gravity of less than 1.5. The maximum particle size of this lightweight coarse aggregate is 15 mm. The above-mentioned foaming agents physically introduce air bubbles into fresh concrete through surface active action. This is a hydrolyzed protein-based foaming agent. More specifically, it is a foaming agent commercially available under the trade name "Glyform." Concrete of each material above} Weight per 1 m3 (Kg)
is as follows. Cement - 460 Water 171 Sand as fine aggregate: 1,023 Light aggregate as coarse aggregate: 532 Water reducer 3.68 Foaming agent 1.2 The water-cement ratio is approximately 37%. In the above-mentioned cellular fresh concrete, the volume ratio of air contained is about 20%, and the diameter of the bubbles is 0.2 to IS strata. In addition, the above-mentioned aerated ready-mixed concrete contains countless air bubbles dispersed therein, so that the specific gravity of the concrete a component other than the lightweight aggregate is reduced and becomes close to that of the lightweight aggregate. Next, the above-mentioned aerated ready-mixed concrete is poured into a cylindrical formwork for centrifugal force forming, and the cylindrical formwork is rotated around its central axis to centrifuge the concrete inside the formwork into a cylindrical shape. Show power. In this centrifugal force shaping process, during the 3 minutes of the first process,
The formwork was rotated at 5 1 6 rpm to apply IOC centrifugal force to the concrete in the formwork, and for 3 minutes in the second step,
The formwork was rotated at 7 3 O rpm to apply a centrifugal force of 20G to the concrete in the formwork, and during the final third step of 9 minutes, the formwork was rotated at 1,032 rpm to apply a centrifugal force of 20G to the concrete in the formwork. Apply a centrifugal force of 40G to the concrete. In the centrifugal force forming process, concrete is centrifugally formed within the formwork, and some of the air contained in the concrete is released to the outside due to the centrifugal force caused by the rotation of the formwork. However, there is no separation between lightweight aggregate and non-lightweight aggregate concrete. After the centrifugal force forming process is completed, the centrifugally formed cylindrical concrete compact is steam cured and hardened to form a cylindrical lightweight concrete product. This cylindrical lightweight concrete product contains coarse aggregate lightweight aggregate and is homogeneous. In addition, the volume ratio of the contained air is about 10%, and the specific gravity is 1
.. It is in 8th place. Therefore, the specific gravity of ordinary concrete products that do not contain lightweight aggregate is around 2.3, making them considerably lighter. Furthermore, the compressive strength is 400K
gf/cm is 2nd place. Therefore, it has higher compressive strength than ordinary lightweight concrete products, which are not affected by centrifugal force. The above-mentioned cylindrical lightweight concrete products are used as pillars of trellises, pillars of buildings, or pipes for flowing fluids. Modifications> 1) As the lightweight aggregate, use porous artificial lightweight aggregate produced by firing and expanding expanded clay, or porous artificial lightweight aggregate produced by baking and hardening fly ash. 2) Use lightweight aggregate as fine aggregate. 3) Use a foaming agent based on a Hewei surfactant or a foaming agent based on a resin soap. 4) Use a foaming agent instead of or together with a foaming agent. A foaming agent generates air bubbles in fresh concrete through a chemical reaction. For example, it is a foaming agent for metallic aluminum powder. 5) Use an AE water reducing agent or an AE agent instead of or together with a water reducing agent. Special fraud employee Chubu Electric Power Co., Ltd.

Claims (1)

【特許請求の範囲】 セメント、水と軽量骨材及び起泡剤又は発泡剤を練り混
ぜて、無数の気泡を分散して含有するコンクリートを生
産し、 このコンクリートを遠心力成形用の型枠に注入し、型枠
を回転して、型枠内のコンクリートを遠心力成形し、 軽量骨材を分散して含有する軽量コンクリート製品を生
産することを特徴とする軽量コンクリート製品の遠心力
成形法。
[Claims] Cement, water, lightweight aggregate, and foaming agent or foaming agent are mixed to produce concrete containing dispersed countless air bubbles, and this concrete is used as a formwork for centrifugal force forming. A centrifugal force forming method for lightweight concrete products, which is characterized by pouring, rotating the formwork, and centrifugally forming the concrete in the formwork to produce lightweight concrete products containing dispersed lightweight aggregate.
JP15484089A 1989-06-16 1989-06-16 Centrifugal forming method of lightweight concrete manufacture Granted JPH0319806A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15484089A JPH0319806A (en) 1989-06-16 1989-06-16 Centrifugal forming method of lightweight concrete manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15484089A JPH0319806A (en) 1989-06-16 1989-06-16 Centrifugal forming method of lightweight concrete manufacture

Publications (2)

Publication Number Publication Date
JPH0319806A true JPH0319806A (en) 1991-01-29
JPH0515524B2 JPH0515524B2 (en) 1993-03-01

Family

ID=15593037

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15484089A Granted JPH0319806A (en) 1989-06-16 1989-06-16 Centrifugal forming method of lightweight concrete manufacture

Country Status (1)

Country Link
JP (1) JPH0319806A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62132607A (en) * 1985-12-06 1987-06-15 日本セメント株式会社 Manufacture of centrifugal-force compaction light-weight concrete pipe

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62132607A (en) * 1985-12-06 1987-06-15 日本セメント株式会社 Manufacture of centrifugal-force compaction light-weight concrete pipe

Also Published As

Publication number Publication date
JPH0515524B2 (en) 1993-03-01

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