JP3226462B2 - Additive for concrete - Google Patents
Additive for concreteInfo
- Publication number
- JP3226462B2 JP3226462B2 JP24250796A JP24250796A JP3226462B2 JP 3226462 B2 JP3226462 B2 JP 3226462B2 JP 24250796 A JP24250796 A JP 24250796A JP 24250796 A JP24250796 A JP 24250796A JP 3226462 B2 JP3226462 B2 JP 3226462B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- concrete
- thickener
- water
- mixed
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/06—Inhibiting the setting, e.g. mortars of the deferred action type containing water in breakable containers ; Inhibiting the action of active ingredients
- C04B40/0641—Mechanical separation of ingredients, e.g. accelerator in breakable microcapsules
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2103/44—Thickening, gelling or viscosity increasing agents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は，水中不分離性コン
クリートや締固め不要コンクリート等の増粘剤を配合す
るコンクリートの品質を改善する技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving the quality of concrete containing a thickening agent such as underwater non-separable concrete and compaction unnecessary concrete.
【０００２】[0002]
【従来の技術】材料分離を起こすことなく高度な流動性
（例えばスランプフローが５０ｃｍ以上）をコンクリー
トに付与するいわゆる高流動性コンクリートは，締固め
不要コンクリート（自己充填型コンクリートとも呼ばれ
る）として実用に供されるようになった。このような高
流動性コンクリートは，高い流動性を付与するために，
高性能減水剤や高性能ＡＥ減水剤等の分散剤を配合し，
加えて，充分な粘性を付与して材料分離抵抗を得るため
に増粘剤が適量配合される。2. Description of the Related Art High fluidity concrete, which imparts high fluidity (for example, slump flow of 50 cm or more) to concrete without causing material separation, is practically used as compaction-free concrete (also called self-compacting concrete). Has been offered. Such high fluidity concrete, in order to impart high fluidity,
Mixing dispersants such as high performance water reducing agent and high performance AE water reducing agent
In addition, an appropriate amount of a thickener is added to impart sufficient viscosity to obtain material separation resistance.
【０００３】分散剤である高性能減水剤や高性能ＡＥ減
水剤としては，β−ナフタリンスルホン酸塩，ポリカル
ボン酸塩，メラミンスルホン酸塩，アルキルアリルスル
ホン酸塩等が用いられ，増粘剤としてはメチルセルロー
ス（ＭＣ）やＨＥＣ（ヒドロキシエチルセルロース），
さらには微生物発酵のバイオポリマー例えばウエランガ
ム等が用いられる。As a high-performance water reducing agent or a high-performance AE water reducing agent as a dispersing agent, β-naphthalene sulfonate, polycarboxylate, melamine sulfonate, alkyl allyl sulfonate and the like are used. Examples include methylcellulose (MC), HEC (hydroxyethylcellulose),
Furthermore, a biopolymer for microbial fermentation, such as welan gum, is used.
【０００４】[0004]
【発明が解決しようとする課題】前記のように増粘剤を
コンクリートに添加する場合には，増粘剤がよく混ざら
ず，だま状（ままこ状）になる恐れがある。特に，前記
のような高流動コンクリートにおいて，その流動性を安
定させる（適度な粘性を付与する）理由で増粘剤を使用
する場合には，増粘剤の添加量は比較的少ないので“だ
ま状”になりやすく，また，だま状になることによる粘
性不足がコンクリートの分離抵抗性を著しく低下させる
ことになる。When a thickener is added to concrete as described above, the thickener may not mix well and may be in the form of a dumbbell. In particular, when a thickener is used for the purpose of stabilizing the fluidity (giving an appropriate viscosity) in the high-fluidity concrete as described above, the addition amount of the thickener is relatively small, so that "dama" In addition, the lack of viscosity due to the lumpy shape significantly reduces the separation resistance of concrete.
【０００５】このことを解決する方法として，増粘剤
（粉末）と分散剤（粉末）をプレミックスしたものを使
用することも行われているが，高価となるという問題が
付随すると共に，意図する高流動性コンクリートに合っ
た分散剤との適切な組み合わせが必要となり，分散剤の
種類ごとに増粘剤をプレミックスすることは，両者の配
合割合の管理や両剤の全添加量の管理が非常に煩雑にな
るという問題がある。As a method for solving this problem, a method in which a thickener (powder) and a dispersant (powder) are premixed has been used. Premixing thickeners for each type of dispersant is necessary to control the proportions of both and control the total amount of both additives. There is a problem that it becomes very complicated.
【０００６】したがって，本発明の目的とするところ
は，粉末状の増粘剤をそれ単独の添加量の算出を易しく
しながら，かつコンクリートへの添加しても“だま状”
になるのを防止することにある。Therefore, an object of the present invention is to make it easy to calculate the addition amount of a powdery thickener by itself, and to add "thickness" to concrete even if it is added to concrete.
It is to prevent becoming.
【０００７】[0007]
【課題を解決するための手段】前述の課題は，粉状の増
粘剤と，石粉，フライアッシュまたは高炉スラグ微粉末
から選ばれる少なくとも１種の無機粉末との混合物を水
溶性フイルムで包んでなるコンクリート用添加剤を用い
ることによって解決できる。SUMMARY OF THE INVENTION The above-mentioned object is to provide a powdery thickener , stone powder, fly ash or blast furnace slag fine powder.
The above problem can be solved by using a concrete additive obtained by wrapping a mixture with at least one kind of inorganic powder selected from the group consisting of water-soluble films.
【０００８】[0008]
【発明の実施の形態】本発明によれば，粉状の増粘剤を
無機粉末とプレミックスし，その混合粉を１００ｇ〜２
Ｋｇ単位で水溶性のフィルムで包んだ固形物（パック）
を作製し，これを，増粘剤目標添加量に対応する所定の
数だけコンクリート練混ぜ中のミキサー内に投入する。
これにより，増粘剤はだま状にならずにコンクリート中
に均等に分散させることができる。According to the present invention, a powdery thickener is premixed with an inorganic powder, and the mixed powder is mixed in an amount of 100 g to 2 g.
Solids wrapped in water-soluble film in Kg units (packs)
Is prepared and poured into a mixer during concrete kneading by a predetermined number corresponding to the target amount of the thickener to be added.
This allows the thickener to be evenly dispersed in the concrete without dulling.
【０００９】増粘剤としては公知のものが使用できる
が，増粘効果の大きいウエランガム（菌体番号 Ａｌｃ
ａｌｉｇｅｎｓ ＡＴＣＣ ３１５５５ の菌種によっ
て産出される微生物醗酵多糖類）の他，メチルセルロー
ス（ＭＣ）やＨＥＣ（ヒドロキシエチルセルロース）等
が好適である。Known thickeners can be used, but welan gum having a large thickening effect (cell number Alc)
In addition to methylcellulose (MC), HEC (hydroxyethylcellulose), etc., in addition to microbial fermented polysaccharides produced by the strains of C. alligens ATCC 31555).
【００１０】増粘剤とプレミックスする無機粉体として
は「石粉」がよく，その中でも石灰石粉が品質及び供給
面で安定して使用できる点で好適である。この石灰石粉
は，ＪＩＳ Ａ ５００８に規格化され，アスファルト
舗装のフィラーとして広く用いられているが，これを本
発明で使用するのが好ましい。また，フライアッシュや
高炉スラグ微粉末も本発明で使用することができる。か
ような無機微粉は高流動性コンクリートに適量配合され
るものであり，その一部を本発明のパック内装材料とす
ることができる。As the inorganic powder to be premixed with the thickener, "stone powder" is preferable, and among them, limestone powder is preferred in that it can be used stably in terms of quality and supply. This limestone powder is standardized in JIS A 5008 and is widely used as a filler for asphalt pavement, but it is preferable to use this in the present invention. Also, fly ash or blast furnace slag fine powder can be used in the present invention. Such an inorganic fine powder is blended in an appropriate amount in high-fluidity concrete, and a part thereof can be used as the pack interior material of the present invention.
【００１１】増粘剤と無機粉体の混合比率は，重量比で
１：１〜１：２０の範囲とする。最適な混合比率は，重
量比で１：９程度である。このプレミックスした混合粉
末を水溶性フィルムで包むわけだが，このフィルムとし
てはコンクリート組成物に悪影響を及ぼさない水溶性の
フイルムであれば特に制限されないが，ポリビニールア
ルコールのフイルムが好適である。The mixing ratio between the thickener and the inorganic powder is in the range of 1: 1 to 1:20 by weight. The optimal mixing ratio is about 1: 9 by weight. The premixed mixed powder is wrapped in a water-soluble film. The film is not particularly limited as long as it is a water-soluble film that does not adversely affect the concrete composition, but a polyvinyl alcohol film is preferable.
【００１２】このように構成した増粘剤と無機粉体のパ
ックを練り混ぜ中のコンクリートに投入すると，水溶性
フイルムが練り混ぜ中のコンクリートの内部で徐々に溶
けて該混合粉が流出し，増粘剤だけを水溶性フイルムに
包み込んだ場合よりも，コンクリート中に増粘剤が均一
に分散することがわかった。これは無機粉体が同伴する
ことにより，増粘剤の拡散が良好に行われるからである
と考えられる。When the pack of the thickener and the inorganic powder thus constituted is put into the concrete being kneaded, the water-soluble film is gradually melted inside the concrete being kneaded and the mixed powder flows out. It was found that the thickener was more uniformly dispersed in the concrete than when the thickener was wrapped in a water-soluble film. This is considered to be because the diffusion of the thickener is favorably performed by the accompanying inorganic powder.
【００１３】粉状の増粘剤と粉状の分散剤とをプレミッ
クスして水溶性フイルムで包んだパックを用いた場合に
も，増粘剤をコンクリート中に均一に分散させることが
できる。したがって，使用する分散剤の種類が特定され
た特定のコンクリートに増粘剤を添加する場合には，か
ようなパックを使用することもできる。[0013] Even when a pack in which a powdery thickener and a powdery dispersant are premixed and wrapped with a water-soluble film is used, the thickener can be uniformly dispersed in concrete. Therefore, when a thickener is added to specific concrete in which the type of dispersant to be used is specified, such a pack can be used.
【００１４】以下に，本発明に従うコンクリート添加剤
を用いた実施例を挙げる。In the following, examples using the concrete additive according to the present invention will be described.
【００１５】[0015]
【実施例】容量が１００Ｌ（リットル）の強制式パン型
ミキサーを用いて下記配合のコンクリート（最適スラン
プフロー値：６０〜７０ｃｍ）を増粘剤の添加法を変え
て１００Ｌ練り混ぜた。EXAMPLES Using a forced pan mixer having a capacity of 100 L (liter), 100 L of concrete having the following composition (optimal slump flow value: 60 to 70 cm) was mixed by changing the method of adding a thickener.
【００１６】 [0016]
【００１７】使用した材料は次のとおりである。 石粉：ＪＩＳ Ａ ５００８に規定の石灰石粉 高性能減水剤：β−ナフタリンスルホン酸塩（花王株式
会社製の商品名マイティ１５０） 増粘剤：粉状のウエランガム（三晶株式会社製）The materials used are as follows. Stone powder: Limestone powder specified in JIS A 5008 High performance water reducing agent: β-naphthalene sulfonate (Mighty 150 manufactured by Kao Corporation) Thickener: Welan gum powder (manufactured by Sansei Corporation)
【００１８】〔ケース１〕増粘剤の規定添加量を予めセ
メントに全量混ぜ合わせ，この増粘剤添加のセメントを
他の材料とともに該ミキサーに投入し，９０秒練り混ぜ
た。[Case 1] The specified addition amount of the thickener was previously mixed with the cement in its entirety, and the cement with the thickener added was put into the mixer together with other materials and kneaded for 90 seconds.
【００１９】〔ケース２〕増粘剤と高性能減水剤（いず
れも粉末状）を重量比で１：９で混ぜ合わせ，この混合
粉を，１パック当り８２．５ｇとして，水溶性ポリビニ
ールアルコールのフイルムで包み込んだ。このパックを
増粘剤の規定添加量となる数だけ使用し，高性能減水剤
の規定添加量は使用したパック数に加えて，残りは粉状
のものをそのまま使用することで確保した。パックの投
入は，コンクリート練り混ぜ中にミキサー内に投入し，
その後，９０秒練り混ぜた。[Case 2] A thickener and a high-performance water reducing agent (both in powder form) are mixed at a weight ratio of 1: 9, and the mixed powder is weighed at 82.5 g per pack. Wrapped in film. This pack was used in an amount equal to the specified amount of the thickener, and the specified amount of the high-performance water reducing agent was ensured by using the powder as it was in addition to the number of packs used. The pack is put into the mixer during concrete mixing,
Thereafter, the mixture was mixed for 90 seconds.
【００２０】〔ケース３〕増粘剤と石粉（石灰石粉）を
重量比で１：９で混ぜ合わせ。この混合粉を，１パック
当り８２．５ｇとして，水溶性ポリビニールアルコール
のフイルムで包み込んだ。このパックを増粘剤の規定添
加量となる数だけコンクリート練り混ぜ中にミキサー内
に投入し，その後，９０秒練り混ぜた。なお，石粉の規
定添加量はこのパックで添加したものと，石粉のまま使
用するものと和で確保した。[Case 3] A thickener and limestone (limestone powder) are mixed at a weight ratio of 1: 9. The mixed powder was wrapped with a film of water-soluble polyvinyl alcohol at 82.5 g per pack. This pack was put into the mixer during kneading of concrete by a number corresponding to the specified addition amount of the thickener, and then kneaded for 90 seconds. The specified addition amount of stone powder was secured by adding the one added in this pack and the one used as it is.
【００２１】各ケースのコンクリートについて練り上が
り直後のスランプフロー値を測定したところ，ケース１
では７５ｃｍ程度，ケース２と３ではいずれも６５ｃｍ
の最適値を示した。また，ケース１ではモルタル分と粗
骨材の分離が著しく，短時間で水状のペーストが上部に
浮き上がる現象が観察された。これに対して，ケース２
と３では，このような現象は見られず，粘性のある良好
な高流動コンクリートが得られた。The slump flow value of the concrete in each case immediately after kneading was measured.
About 75cm in case 2 and 65cm in case 2 and 3
The optimal value was shown. In case 1, the mortar component and the coarse aggregate were significantly separated, and a phenomenon in which the water-like paste was lifted to the upper portion in a short time was observed. In contrast, Case 2
In Nos. 3 and 3, such a phenomenon was not observed, and a good viscous high fluidity concrete was obtained.
【００２２】[0022]
【発明の効果】本発明によると，増粘剤をコンクリート
中に均一に分散させることができるので粘性の安定した
良品質の高流動性コンクリートが得られる。また，本発
明のコンクリート添加剤は包みのままミキサーに投入す
ればよいので，袋を破いて粉体を投入するのと比べると
投入手間が省略できるし，どのタイプの分散剤を配合す
るコンクリートに対しても単独に増粘剤の添加量を正確
に把握できる。また，増粘剤の添加量の把握は，各単位
パックに増粘剤の含有量を表示しておけば，一層簡便と
なる。According to the present invention, the thickener can be uniformly dispersed in the concrete, so that a high-quality concrete with stable viscosity and good quality can be obtained. In addition, since the concrete additive of the present invention can be put into a mixer as it is wrapped, it is possible to save time and effort compared to breaking the bag and putting the powder into the mixer. On the other hand, the amount of the thickener added can be accurately grasped alone. Further, it is easier to grasp the amount of the thickener to be added by displaying the content of the thickener in each unit pack.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ // Ｃ０４Ｂ 24/22 Ｃ０４Ｂ 24/22 Ｃ Ｃ０４Ｂ 103:32 Ｃ０４Ｂ 103:32 103:44 103:44 (72)発明者 吉崎 政人 大阪府大阪市中央区北浜東１番29号 三 晶株式会社内 (56)参考文献 特開 平６−55529（ＪＰ，Ａ) 特開 平６−320528（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B28C 7/00 C04B 14/06 C04B 14/28 C04B 24/38 C08L 101/14 C04B 24/22 C04B 103:32 C04B 103:44 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI // C04B 24/22 C04B 24/22 C C04B 103: 32 C04B 103: 32 103: 44 103: 44 (72) Inventor Masayoshi Yoshizaki No. 1-29, Kitahama-higashi, Chuo-ku, Osaka City, Osaka Prefecture (56) References JP-A-6-55529 (JP, A) JP-A-6-320528 (JP, A) (58) Field (Int.Cl. 7 , DB name) B28C 7/00 C04B 14/06 C04B 14/28 C04B 24/38 C08L 101/14 C04B 24/22 C04B 103: 32 C04B 103: 44
Claims (3)
または高炉スラグ微粉末から選ばれる少なくとも１種の
無機粉末との混合物を水溶性フイルムで包んでなるコン
クリート用添加剤。1. A powdery thickener , stone powder, fly ash
Alternatively, a concrete additive obtained by wrapping a mixture with at least one inorganic powder selected from blast furnace slag fine powder with a water-soluble film.
水溶性フイルムで包んでなる高流動性コンクリート用添
加剤。2. A highly fluid concrete additive comprising a mixture of powdered welan gum and stone powder wrapped in a water-soluble film.
比で１：１〜１：２０の範囲で混合した混合粉を１００
〜２Ｋｇの範囲で水溶性ポリビニールアルコールのフイ
ルムで包んでなる高流動性コンクリート用添加剤。3. A mixed powder obtained by mixing powdered welan gum and limestone powder in a weight ratio of 1: 1 to 1:20 is mixed with 100 powder.
Additive for highly fluid concrete wrapped in water-soluble polyvinyl alcohol film in the range of ~ 2 kg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24250796A JP3226462B2 (en) | 1996-08-27 | 1996-08-27 | Additive for concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24250796A JP3226462B2 (en) | 1996-08-27 | 1996-08-27 | Additive for concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1058430A JPH1058430A (en) | 1998-03-03 |
| JP3226462B2 true JP3226462B2 (en) | 2001-11-05 |
Family
ID=17090139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24250796A Expired - Lifetime JP3226462B2 (en) | 1996-08-27 | 1996-08-27 | Additive for concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3226462B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003055014A (en) * | 2001-08-23 | 2003-02-26 | Asahi Denka Kogyo Kk | Thickener for cement |
| JP5051710B2 (en) * | 2007-10-16 | 2012-10-17 | 彰郎 釜谷 | Cement admixture package, method for producing the same, and method for adding cement admixture |
| JP7285054B2 (en) * | 2018-09-20 | 2023-06-01 | 大成建設株式会社 | Method for producing fluidized concrete and method for constructing concrete structure |
| JP2021110163A (en) * | 2020-01-10 | 2021-08-02 | 鹿島建設株式会社 | Construction method of concrete building |
-
1996
- 1996-08-27 JP JP24250796A patent/JP3226462B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1058430A (en) | 1998-03-03 |
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