JPH0798700B2 - Method for manufacturing lightweight foam concrete product - Google Patents
Method for manufacturing lightweight foam concrete productInfo
- Publication number
- JPH0798700B2 JPH0798700B2 JP22696686A JP22696686A JPH0798700B2 JP H0798700 B2 JPH0798700 B2 JP H0798700B2 JP 22696686 A JP22696686 A JP 22696686A JP 22696686 A JP22696686 A JP 22696686A JP H0798700 B2 JPH0798700 B2 JP H0798700B2
- Authority
- JP
- Japan
- Prior art keywords
- foam
- cement composition
- cement
- concrete product
- weight
- 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
- 239000011381 foam concrete Substances 0.000 title claims description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 238000000034 method Methods 0.000 title claims description 13
- 239000004568 cement Substances 0.000 claims description 59
- 239000000203 mixture Substances 0.000 claims description 49
- 239000006260 foam Substances 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000004088 foaming agent Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 7
- 238000004898 kneading Methods 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 210000004027 cell Anatomy 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 5
- 239000003381 stabilizer Substances 0.000 description 5
- 239000004567 concrete Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920000609 methyl cellulose Polymers 0.000 description 4
- 239000001923 methylcellulose Substances 0.000 description 4
- 102000004169 proteins and genes Human genes 0.000 description 4
- 108090000623 proteins and genes Proteins 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 3
- 239000010426 asphalt Substances 0.000 description 3
- 239000011396 hydraulic cement Substances 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229920003169 water-soluble polymer Polymers 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 2
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 2
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 2
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- UOBYKYZJUGYBDK-UHFFFAOYSA-N 2-naphthoic acid Chemical compound C1=CC=CC2=CC(C(=O)O)=CC=C21 UOBYKYZJUGYBDK-UHFFFAOYSA-N 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 239000004373 Pullulan Substances 0.000 description 1
- 229920001218 Pullulan Polymers 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 210000001565 alc Anatomy 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 235000019423 pullulan Nutrition 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【発明の詳細な説明】 ［技術分野］ 本発明は、外壁材、内壁材、床材、天井材、断熱材、遮
音材、吸音材など広範囲の用途に使用される軽量気泡コ
ンクリート製品の製造方法に関するものである。TECHNICAL FIELD The present invention relates to a method for producing a lightweight cellular concrete product which is used in a wide range of applications such as an outer wall material, an inner wall material, a floor material, a ceiling material, a heat insulating material, a sound insulating material and a sound absorbing material. It is about.
［背景技術］ コンクリートで成形物、特に建材などを製造するにあた
って乾式工法を採用することが近年増大しており、中で
も軽量気泡コンクリート製品はALC（Autoclaved Lightw
eight Concrete）を中心として伸張している。このALC
は建材としては極めて有用であるが、吸水性が高く本来
持っている断熱性を著しく低下され、しかも寒冷地での
冬期の環境下でその水分が凍結して体積膨張による破壊
や亀裂が生じたりするという多大な欠陥を有しており、
その使用が大きく制限されているというのが現状であ
る。[Background Art] In recent years, the use of a dry method has been increasing in the production of molded articles, particularly building materials, from concrete. Among them, lightweight cellular concrete products are manufactured by ALC (Autoclaved Lightw).
Eight concrete) is the main stretch. This ALC
Is extremely useful as a building material, but its water absorbency is high and its inherent heat insulating property is significantly reduced, and its water freezes in the winter environment in cold regions, causing damage and cracks due to volume expansion. Has a huge defect that
The current situation is that its use is greatly restricted.
また軽量気泡コンクリート製品をその製造法から見た場
合、ポストフォーム法とプレフォーム法とがある。ポス
トフォーム法は発泡剤を含むセメントペーストなどセメ
ント組成物を型に注入したのちに発泡させるものであ
り、殆どのALCはこの方法によって製造されている。こ
れに対してプレフォーム法は予め起泡剤及び気泡安定剤
によって作成した泡をセメントペーストなどセメント組
成物に混合し、この泡を混合したセメント組成物を型に
注入成形して硬化させるものであり、この予め泡を作成
しておくプレフォーム法では所望の断面形状を有する軽
量気泡コンクリート製品を成形することができるという
特長を有する。しかし、プレフォーム法で軽量気泡コン
クリート製品を製造するにあたって、常温で成形をおこ
なう場合にはセメントの硬化に長時間を要すると共にこ
の硬化に要する時間の間泡や発泡体の破壊を防ぐために
細心の取り扱いを必要とし、製造効率が低下することに
なる。そこで、型への注型後に加熱をおこなってセメン
トの硬化が迅速になされるようにしているが、この加熱
で泡が膨張して泡同士連通し合って連続気泡が形成され
ることになり、連続気泡による吸水で断熱性能が低下し
たり、寒冷地での凍結による破壊や亀裂が発生したりす
るおそれがあり、さらには泡の膨張破壊で製品にヤセが
起こったりするという種々の問題を有するものであっ
た。When the lightweight cellular concrete product is viewed from its manufacturing method, there are a post-form method and a pre-form method. The post-form method is a method in which a cement composition such as a cement paste containing a foaming agent is injected into a mold and then foamed, and most ALCs are manufactured by this method. On the other hand, the preform method is a method in which foam prepared in advance with a foaming agent and a foam stabilizer is mixed with a cement composition such as cement paste, and the cement composition mixed with the foam is injected into a mold and cured. However, this preforming method of forming bubbles in advance has a feature that a lightweight cellular concrete product having a desired cross-sectional shape can be formed. However, when manufacturing lightweight cellular concrete products by the preform method, when molding is performed at room temperature, it takes a long time for the cement to harden, and during the time required for this hardening, care must be taken to prevent bubbles and foam destruction. It requires handling, resulting in reduced manufacturing efficiency. Therefore, heating is performed after casting into the mold so that the cement is hardened quickly, but this heating causes the bubbles to expand and communicate with each other to form continuous cells, There are various problems that the water absorption due to open cells may lower the heat insulation performance, breakage or cracks may occur due to freezing in cold regions, and further the expansion of the foam may cause the product to become dry. It was a thing.
［発明の目的］ 本発明は、上記の点に鑑みて為されたものであり、プレ
フォーム法で独立気泡が連続気泡になることなく製造を
おこなうことができる軽量気泡コンクリート製品の製造
方法を提供することを目的とするものである。[Object of the Invention] The present invention has been made in view of the above points, and provides a method for producing a lightweight cellular concrete product which can be produced by the preforming method without the closed cells becoming continuous cells. The purpose is to do.
［発明の開示］ しかして本発明に係る軽量気泡コンクリート製品の製造
方法は、セメントを主成分とし水と混練して調製される
セメント組成物に予め起泡剤によって作成した泡を混合
し、この泡を混合したセメント組成物を成形硬化させる
プレフォーム泡で軽量気泡コンクリートを製造するにあ
たって、セメント組成物と泡とをそれぞれ40〜80℃に保
持した状態で混合して成形硬化させることを特徴とする
ものであり、以下本発明を詳細に説明する。DISCLOSURE OF THE INVENTION The method for producing a lightweight aerated concrete product according to the present invention, however, comprises mixing a foam prepared in advance with a foaming agent into a cement composition prepared by kneading cement as a main component with water, In producing a lightweight cellular concrete with preform foam for molding and curing a cement composition mixed with foam, the cement composition and the foam are mixed and molded and cured while being kept at 40 to 80 ° C., respectively. The present invention will be described in detail below.
セメント組成物は水硬性セメントを主成分とし、これに
骨材などを配合すると共に水と混練することによって、
セメントスラリーやセメントペーストとして調製される
ものであり、水硬性セメントとしては普通ポルトランド
セメント、白セメント、アルミナセメント、ジェットセ
メント、石膏、高炉スラグなどを単独で、あるいは二種
以上を混合して使用することができる。また骨材として
は珪砂、珪石粉末、フライアッシュ、シリカフラワー、
炭酸カルシウムなどを単独であるいは二種以上を混合し
て使用することができるが、特に耐熱性を要求される用
途に対してはシェルベン、シャモットなどの耐熱骨材を
用いるのが好ましい。ここで、水硬性セメントと骨材と
の配合割合は、重量比で80/20〜20/80の範囲が一般的で
ある。またセメント組成物には後述の混合される泡を安
定させるために泡安定剤を配合するのが好ましい。泡安
定剤は泡を導入する前に予めセメント組成物に配合して
おいても、泡を導入したのちにセメント組成物に配合す
るようにしてもいずれでもよいが、後述の加熱時の泡の
安定性や成形された軽量気泡セメント製品の吸水率低減
の効果を得るためには泡安定剤は泡を導入する前に予め
セメント組成物に配合しておくのが好ましい。この泡安
定剤としてはアスファルトエマルジョン、アクリルエマ
ルジョン、酢酸ビニル系エマルジョンなどを単独で、あ
るいは二種以上を混合して使用することができ、配合量
は1.5〜50重量％、特に２〜15重量％が好ましい。セメ
ント組成物にはさらに必要に応じてリグニンスルホン酸
塩、βナフタリン酸塩、ホルマリン縮合物などの減水剤
を２重量％以下の配合量で配合して、セメント組成物の
流動性を調整することもできる。The cement composition is mainly composed of hydraulic cement, and by adding aggregate and the like to this and kneading with water,
It is prepared as cement slurry or cement paste, and as hydraulic cement, ordinary Portland cement, white cement, alumina cement, jet cement, gypsum, blast furnace slag, etc. are used alone or in combination of two or more. be able to. As aggregates, silica sand, silica stone powder, fly ash, silica flower,
Calcium carbonate and the like can be used alone or as a mixture of two or more kinds, but it is preferable to use heat-resistant aggregates such as Schelven and chamotte particularly for applications where heat resistance is required. Here, the mixing ratio of hydraulic cement and aggregate is generally in the range of 80/20 to 20/80 by weight. Further, it is preferable to add a foam stabilizer to the cement composition in order to stabilize the foam to be mixed as described later. The foam stabilizer may be preliminarily blended in the cement composition before introducing the foam, or may be blended in the cement composition after introducing the foam. In order to obtain stability and the effect of reducing the water absorption rate of the formed lightweight aerated cement product, it is preferable to preliminarily mix the foam stabilizer into the cement composition before introducing the foam. As the foam stabilizer, an asphalt emulsion, an acrylic emulsion, a vinyl acetate emulsion or the like can be used alone or in combination of two or more, and the compounding amount is 1.5 to 50% by weight, particularly 2 to 15% by weight. Is preferred. If necessary, a water reducing agent such as lignin sulfonate, β-naphthalate and formalin condensate is added to the cement composition in an amount of 2% by weight or less to adjust the fluidity of the cement composition. You can also
泡は、起泡剤を水に混合して圧縮空気とともに独立気泡
発生処理器に導入して通過させることによって作成され
るものであるが、起泡剤としては蛋白質系、ノニオン
系、両性系、高分子多価金属塩等の各起泡剤を単独であ
るいは二種以上を混合して使用することができる。この
ように泡を作成するにあたって増粘のために水溶性高分
子を併用するのが好ましく、水溶性高分子としてはポリ
ビニルアルコール（PVA）、ヒドロキシプロピルメチル
セルロース（HPMC）、ヒドロキシエチルセルロース（HE
C）、メチルセルロース（MC）、ポリビニルピロリド
ン、プルランなどを単独であるいは二種以上を混合して
使用することができる。この泡の発生系において起泡剤
の配合量は0.001〜５重量％、水溶性高分子の配合量は
0.01〜１重量％の範囲にそれぞれ設定するのが好まし
く、泡は40〜80℃の粘度が10000cps以上に、密度が0.03
〜0.08g/cm3に調整されるようにするのがよい。Foam is created by mixing a foaming agent with water and introducing it into a closed-cell generating processor together with compressed air, and as the foaming agent, protein-based, nonionic-based, amphoteric-based, The foaming agents such as polymeric polyvalent metal salts may be used alone or in combination of two or more. It is preferable to use a water-soluble polymer together in order to thicken the foam in this way, and as the water-soluble polymer, polyvinyl alcohol (PVA), hydroxypropylmethylcellulose (HPMC), hydroxyethylcellulose (HE
C), methylcellulose (MC), polyvinylpyrrolidone, pullulan and the like can be used alone or in combination of two or more. In this foam generating system, the content of the foaming agent is 0.001 to 5% by weight, and the content of the water-soluble polymer is
It is preferable to set each in the range of 0.01 to 1% by weight, and the foam has a viscosity at 40 to 80 ° C of 10,000 cps or more and a density of 0.03.
It should be adjusted to ~ 0.08g / cm 3 .
しかして上記のように調整されたセメント組成物と均一
微細な独立気泡として作成された泡をそれぞれ40〜80℃
の温度に予め加温しておいて、この温度を保持させつつ
セメント組成物に泡を供給して撹拌混練し、セメント組
成物に泡を含有させる。セメント組成物への泡の配合量
は、空気量が容積で40〜200％になる範囲が好ましい。
そしてさらにこの温度を保持させた状態でセメント組成
物を型に注入して硬化させ、軽量気泡コンクリート製品
を得るのである。ここで、泡を含有するセメント組成物
は40〜80℃の温度に加温保持された状態で形成されるた
めに硬化は迅速に進行し、製造効率を高めることができ
るものであり、しかも泡は成形の前から40〜80℃の温度
に加温された状態にあるために、セメント組成物が40〜
80℃の加温温度条件で成形硬化される際に泡が膨張され
るようなことはなく、泡の膨張によって連通気泡になる
おそれなく軽量気泡コンクリート製品を製造することが
できることになる。またこのように成形硬化の際に泡は
温度変化を大きく受けず膨張されたりしないために、セ
メント組成物への泡の配合に応じた比重の軽量気泡セメ
ント製品を得ることができ、所期の目的とする比重の軽
量気泡セメント製品を得ることができるものである。
尚、加温温度が40℃未満であれば、セメント組成物の硬
化速度を十分に高めることができないものであり、また
加温温度が80℃を超えても、もはやセメント組成物の硬
化速度をこれ以上高めることがでずエネルギー的に不経
済になると共に泡の安定性が低下することになる。従っ
て本発明においてはセメント組成物や泡の加温温度は40
〜80℃の範囲に限定される。Then, the cement composition prepared as described above and the foam formed as uniform fine closed cells are respectively 40 to 80 ° C.
Is preheated to the above temperature, and while maintaining this temperature, bubbles are supplied to the cement composition, and the mixture is stirred and kneaded so that the cement composition contains bubbles. The blending amount of bubbles in the cement composition is preferably such that the volume of air is 40 to 200% by volume.
Then, while maintaining this temperature, the cement composition is poured into a mold and hardened to obtain a lightweight cellular concrete product. Here, since the cement composition containing bubbles is formed in a state of being heated and maintained at a temperature of 40 to 80 ° C., the curing progresses rapidly, and the production efficiency can be increased. Since it is in a state of being heated to a temperature of 40 to 80 ° C before molding, the cement composition is 40 to
The foam does not expand when it is molded and hardened under the heating temperature condition of 80 ° C., and it is possible to manufacture a lightweight cellular concrete product without the risk of becoming open cells due to expansion of the foam. Further, since the foam is not greatly affected by the temperature change and is not expanded during the molding and curing as described above, it is possible to obtain a lightweight aerated cement product having a specific gravity according to the composition of the foam in the cement composition. It is possible to obtain a lightweight aerated cement product having a desired specific gravity.
If the heating temperature is less than 40 ° C, the curing rate of the cement composition cannot be sufficiently increased, and even if the heating temperature exceeds 80 ° C, the curing rate of the cement composition is no longer increased. If it is not increased further, it becomes uneconomical in terms of energy and the stability of the foam decreases. Therefore, in the present invention, the heating temperature of the cement composition or foam is 40
Limited to ~ 80 ° C.
次に本発明を実施例によって具体的に説明する。Next, the present invention will be specifically described with reference to examples.
実施例１ 普通ポルトランドセメント80重量部、ジェットセメント
20重量部、石膏２重量部、珪砂（８号）40重量部、アス
ファルトエマルジョン４重量部、水30重量部の配合物を
加温されたミキサーで撹拌混合することによって、65℃
に加温した状態のセメント組成物を調製した。一方、65
℃に加熱した圧力容器に水と蛋白質系起泡剤とメチルセ
ルロースを20:1:0.1の重量比の割合で封入し、これに圧
縮空気を圧入することによって、圧入容器のノズルから
密度が0.04g/cm3の65℃に加温された均一微細な独立気
泡の泡を作成した。次にセメント組成物に泡をセメント
組成物の密度が0.42g/cm3になるまで注入して混合し、
この泡を含有させたセメント組成物を型枠に注型し、65
℃の温度を１時間保持しつつ硬化させて発泡硬化体を得
た。これを養生することによって密度が0.31g/cm3の軽
量気泡コンクリート製品を得た。Example 1 80 parts by weight of ordinary Portland cement, jet cement
65 parts by mixing 20 parts by weight, 2 parts by weight of gypsum, 40 parts by weight of silica sand (No. 8), 4 parts by weight of asphalt emulsion, and 30 parts by weight of water by stirring with a heated mixer.
A cement composition in a state of being heated was prepared. On the other hand, 65
Enclose water, protein-based foaming agent and methylcellulose in a weight ratio of 20: 1: 0.1 in a pressure vessel heated to ℃, and pressurize compressed air into it to obtain a density of 0.04 g from the nozzle of the press-fitting vessel. A uniform fine closed cell foam heated to 65 ° C./cm 3 was created. Next, inject and mix bubbles into the cement composition until the density of the cement composition becomes 0.42 g / cm 3 .
The cement composition containing this foam was cast into a mold, and 65
The foamed cured product was obtained by curing while maintaining the temperature of C for 1 hour. By curing this, a lightweight cellular concrete product having a density of 0.31 g / cm 3 was obtained.
実施例２ セメント組成物に泡をセメント組成物の密度が0.75g/cm
3になるまで注入するようにした他は、実施例１と同様
にして密度が0.62g/cm3の軽量気泡コンクリート製品を
得た。Example 2 Bubbles in cement composition Cement composition density 0.75 g / cm
A lightweight aerated concrete product having a density of 0.62 g / cm 3 was obtained in the same manner as in Example 1 except that pouring was performed until the amount became 3 .
実施例３ 普通ポルトランドセメント80重量部、ハイアルミナセメ
ント20重量部、フライアッシュ40重量部、アスファルト
エマルジョン５重量部、水30重量部の配合物を加温され
たミキサーで撹拌混合することによって、50℃に加温し
た状態のセメント組成物を調製した。一方、50℃に加熱
した圧力容器に水と蛋白質系起泡剤とポリビニルアルコ
ールを20:1:0.2の重量比の割合で封入し、これに圧縮空
気を圧入することによって、圧入容器のノズルから密度
が0.05g/cm3の50℃に加温された均一微細な独立気泡の
泡を作成した。次にセメント組成物に泡をセメント組成
物の密度が0.9g/cm3になるまで注入して混合し、この泡
を含有させたセメント組成物を型枠に注型し、50℃の温
度を40分間保持しつつ硬化させて発泡硬化体を得た。こ
れを養生することによって密度が0.81g/cm3の軽量気泡
コンクリート製品を得た。Example 3 By blending 80 parts by weight of ordinary Portland cement, 20 parts by weight of high alumina cement, 40 parts by weight of fly ash, 5 parts by weight of asphalt emulsion, and 30 parts by weight of water by stirring with a warm mixer, 50 A cement composition heated to 0 ° C was prepared. On the other hand, water, protein-based foaming agent, and polyvinyl alcohol were enclosed in a pressure vessel heated to 50 ° C at a weight ratio of 20: 1: 0.2, and compressed air was press-fitted into the vessel, so that the nozzle of the press-fitted vessel was discharged. A uniform fine closed-cell foam heated to 50 ° C. with a density of 0.05 g / cm 3 was prepared. Next, bubbles are poured into the cement composition until the density of the cement composition becomes 0.9 g / cm 3 and mixed, and the cement composition containing the bubbles is cast into a mold, and the temperature of 50 ° C. is set. A foamed cured product was obtained by curing while holding for 40 minutes. By curing this, a lightweight cellular concrete product having a density of 0.81 g / cm 3 was obtained.
比較例 実施例１と同じ配合のセメント組成物を常温（20〜25
℃）の条件下でミキサーで撹拌混合して調製するように
した。また常温の条件下で圧力容器に水と蛋白質系起泡
剤とメチルセルロースを20:1:0.05の重量比の割合で封
入し、これに圧縮空気を圧入することによって、圧入容
器のノズルから密度が0.045g/cm3の均一微細な独立気泡
の泡を作成した。次にセメント組成物に泡をセメント組
成物の密度が0.85g/cm3になるまで注入して混合し、こ
の泡を含有させたセメント組成物を型枠に注型し、常温
で６時間放置したのち１℃／分の昇温速度で80℃まで加
熱し、この温度に10時間保持して発泡硬化体を得た。こ
れを養生することによって密度が0.72g/cm3の軽量気泡
コンクリート製品を得た。Comparative Example A cement composition having the same composition as in Example 1 was used at room temperature (20 to 25
It was prepared by stirring and mixing with a mixer under the condition of (° C.). Also, under normal temperature conditions, water, protein-based foaming agent, and methylcellulose were sealed in a weight ratio of 20: 1: 0.05 in a pressure vessel, and compressed air was pressed into this, so that the density from the nozzle of the press-fitting vessel was increased. A uniform fine closed cell foam of 0.045 g / cm 3 was created. Next, bubbles are poured into the cement composition until the density of the cement composition reaches 0.85 g / cm 3 and mixed, and the cement composition containing the bubbles is cast into a mold and left at room temperature for 6 hours. After that, it was heated to 80 ° C. at a temperature rising rate of 1 ° C./min and kept at this temperature for 10 hours to obtain a foam-cured product. By curing this, a lightweight cellular concrete product having a density of 0.72 g / cm 3 was obtained.
上記実施例１乃至３及び比較例によって得た軽量気泡コ
ンクリート製品の吸水率を測定し、結果を次表に示し
た。The water absorption of the lightweight cellular concrete products obtained in Examples 1 to 3 and Comparative Example was measured, and the results are shown in the following table.
上表の結果、各実施例のものは吸水率が低く、独立気泡
によって軽量気泡コンクリート製品が形成されているこ
とが確認される。 As a result of the above table, it is confirmed that each of the examples has a low water absorption rate and the lightweight cellular concrete product is formed by the closed cells.
［発明の効果］ 上述のように本発明にあっては、セメント組成物と泡と
をそれぞれ40〜80℃に保持した状態で混合して成形硬化
させるようにしたので、泡を含有するセメント組成物を
40〜80℃の温度に加温した状態で迅速に硬化させること
ができて製造効率を高めることができるものであり、し
かも泡は成形の前から40〜80℃の温度に加温された状態
にあって成形硬化の際に泡が膨張されるようなことはな
く、泡の膨張で連通気泡が生じるおそれなく軽量気泡コ
ンクリート製品を製造することができるものであり、吸
水で断熱性能が低下したり寒冷地での凍結による破壊や
亀裂が発生したりすることを防止できるものである。[Effects of the Invention] As described above, in the present invention, the cement composition and the foam are mixed in a state of being maintained at 40 to 80 ° C to be molded and cured, so that the cement composition containing the foam Things
It can be quickly cured while being heated to a temperature of 40 to 80 ° C to improve manufacturing efficiency, and the foam is heated to a temperature of 40 to 80 ° C before molding. Therefore, the foam does not expand during molding and curing, and it is possible to manufacture a lightweight cellular concrete product without the risk of open cells due to expansion of the foam, and water absorption reduces the heat insulation performance. In addition, it is possible to prevent the occurrence of breakage and cracks due to freezing in cold regions.
Claims (1)
れるセメント組成物に予め起泡剤によって作成した泡を
混合し、この泡を混合したセメント組成物を成形硬化さ
せるプレフォーム法で軽量気泡コンクリートを製造する
にあたって、セメント組成物と泡とをそれぞれ40〜80℃
に保持した状態で混合して成形硬化させることを特徴と
する軽量気泡コンクリート製品の製造方法。1. A preform method in which a cement composition containing cement as a main component and prepared by kneading with water is mixed with foam prepared in advance by a foaming agent, and the cement composition mixed with the foam is molded and cured. In producing lightweight cellular concrete, the cement composition and foam are each 40 to 80 ° C.
A method for producing a lightweight cellular concrete product, which comprises mixing and molding and curing while maintaining the condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22696686A JPH0798700B2 (en) | 1986-09-25 | 1986-09-25 | Method for manufacturing lightweight foam concrete product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22696686A JPH0798700B2 (en) | 1986-09-25 | 1986-09-25 | Method for manufacturing lightweight foam concrete product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6385072A JPS6385072A (en) | 1988-04-15 |
| JPH0798700B2 true JPH0798700B2 (en) | 1995-10-25 |
Family
ID=16853410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22696686A Expired - Lifetime JPH0798700B2 (en) | 1986-09-25 | 1986-09-25 | Method for manufacturing lightweight foam concrete product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0798700B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2504444B2 (en) * | 1987-03-03 | 1996-06-05 | 旭化成工業株式会社 | Method for manufacturing lightweight concrete by high temperature injection |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5522435B2 (en) | 2009-09-09 | 2014-06-18 | 国立大学法人三重大学 | Suppression of obesity by inhibition of MXD3 gene expression |
-
1986
- 1986-09-25 JP JP22696686A patent/JPH0798700B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5522435B2 (en) | 2009-09-09 | 2014-06-18 | 国立大学法人三重大学 | Suppression of obesity by inhibition of MXD3 gene expression |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6385072A (en) | 1988-04-15 |
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