JPH0764606B2 - Admixture - Google Patents
AdmixtureInfo
- Publication number
- JPH0764606B2 JPH0764606B2 JP61120178A JP12017886A JPH0764606B2 JP H0764606 B2 JPH0764606 B2 JP H0764606B2 JP 61120178 A JP61120178 A JP 61120178A JP 12017886 A JP12017886 A JP 12017886A JP H0764606 B2 JPH0764606 B2 JP H0764606B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- admixture
- strength
- concrete
- noro
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/16—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 calcium sulfate cements containing anhydrite, e.g. Keene's cement
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は高強度遠心力成形コンクリート管（以下単にコ
ンクリート管という）を製造するための混和材に関す
る。The present invention relates to an admixture for producing a high-strength centrifugally formed concrete pipe (hereinafter simply referred to as a concrete pipe).
従来のコンクリート管，たとえば高強度パイル，高強度
ヒユーム管，推進管等の製造はコンクリート原料に各種
の混和材料を適宜に選択配合し，練り混ぜ，得られた混
練物を，予め鉄筋を配設した円筒型枠に投入し，所要の
遠心力をかけて円筒を成形し，次いで該円筒内側に発生
したノロやペースト層（以下これらを総称してノロ層と
いう）を排除したのち，蒸気養生し脱型することによっ
てつくられていた。For the production of conventional concrete pipes, such as high-strength piles, high-strength huym pipes, and propulsion pipes, various admixture materials are appropriately selected and mixed into concrete raw materials, and the resulting kneaded product is pre-installed with reinforcing bars. It is put into a cylindrical formwork, and the required centrifugal force is applied to form a cylinder. Then, the slag and the paste layer (hereinafter collectively referred to as slag layer) generated inside the cylinder are removed, and then steam curing is performed. It was created by demolding.
前記コンクリート管は高強度を必要とするところから，
一般にコンクリート原料に強度増進材が添加されてい
た。Since the concrete pipe requires high strength,
In general, strength enhancing materials have been added to concrete raw materials.
しかしながら前記製法にしたがって，コンクリート管を
製造したさい，コンクリート原料に添加されている強度
増進材の一部が遠心力によって生じたノロ層にも含まれ
ており，これがノロ層といっしょに排除される。したが
ってコンクリート管の設計強度を確保するためには，予
め排除される量に相当する量だけ多く強度増進材を配合
しなければならない欠点を有していた。However, when the concrete pipe is manufactured according to the above manufacturing method, a part of the strength enhancing material added to the concrete raw material is also included in the Noro layer generated by the centrifugal force, and this is removed together with the Noro layer. . Therefore, in order to secure the design strength of the concrete pipe, there is a drawback that it is necessary to add a large amount of the strength enhancing material in an amount corresponding to the amount eliminated in advance.
一方本発明出願人は先に遠心力成形コンクリート製品の
製法として，ノロ層の発生の防止を目的としてコンクリ
ート原料にセルロース系化合物および／またはポリアク
リルアミド系化合物からなる混和材料を単独に添加する
方法を開発し提案した（特願昭60−42894）。この方法
によればノロ層の発生を防止するという一応の目的は達
成できたが，より高強度を必要とする前記のコンクリー
ト管を製造するにはノロ層の発生を防止しただけでは十
分な強度が得られなかった。On the other hand, the applicant of the present invention has previously proposed, as a method for producing a centrifugally-formed concrete product, a method in which an admixture material consisting of a cellulosic compound and / or a polyacrylamide compound is added alone to a concrete raw material for the purpose of preventing the formation of noro layers. Developed and proposed (Japanese Patent Application No. 60-42894). Although this method achieved the tentative purpose of preventing the formation of the noro layer, it is sufficient to prevent the formation of the noro layer in order to produce the concrete pipes that require higher strength. Was not obtained.
そこで本発明者らは従来の混和材料のそれぞれがもつ欠
点を解消し，ノロ層の発生を防止しつつ，高強度を発現
する混和材について鋭意研究した結果，下記に述べる発
明に到達したものである。Therefore, the inventors of the present invention have solved the drawbacks of each of the conventional admixtures, and have diligently studied an admixture exhibiting high strength while preventing the formation of a noro layer, and as a result, have reached the invention described below. is there.
すなわち本発明の要旨は，セメント100重量部に対し、
0.5〜26重量部添加する蒸気養生工程を含む高強度遠心
力成形コンクリート管製造用混和材であって、その組成
が無水石こう23.0〜99.9重量％および水溶性高分子化合
物77.0〜0.1重量％からなることを特徴とする混和材に
ある。That is, the gist of the present invention is, with respect to 100 parts by weight of cement,
An admixture for the production of high-strength centrifugally-formed concrete pipes, including a steam-curing process in which 0.5 to 26 parts by weight is added, the composition of which is anhydrous gypsum 23.0 to 99.9% by weight and water-soluble polymer compound 77.0 to 0.1% by weight. It is an admixture characterized by that.
本発明で使用される無水石こうとしては市販のＩ型,II
型およびIII型の各無水石こうが該当し，それらの中か
ら適宜に１種または２種以上を混合して用いる。As the anhydrous gypsum used in the present invention, commercially available type I, II
Type III and type III anhydrous gypsum are applicable, and one or two or more of them are appropriately mixed and used.
水溶性高分子化合物としては市販のセルロース誘導体
（たとえば，カルボキシメチルセルロース，エチルセル
ロース，ヒドロキシエチルセルロース，ヒドロキシプロ
ピルセルロース，ヒドロキシプロピルメチルセルロー
ス，キサントゲン酸セルロース，グリオキザール付加ヒ
ドロキシプロピルメチルセルロース等），アクリル系化
合物（たとえば，ポリアクリルアミド，ポリメタアクリ
ルアミド，ポリアクリルアミド変性物等）およびポリエ
チレン系化合物（たとえば，ポリエチレンオキサイド，
ポリエチレングリコール等）が示される。上記化合物は
単独で用いても,2種以上の混合物を用いてもよい。また
上記化合物を含むものとして水中コンクリート用混和材
料があり，たとえば「シーベター」（三共化成工業社
製），「UWB」（三共石油化学工業社製），「アクリス1
2」（日曹マスタービルダーズ社製），「USCA」（信越
化学工業社製）も用いることができる。Examples of the water-soluble polymer compound include commercially available cellulose derivatives (eg, carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, cellulose xanthate, glyoxal-added hydroxypropyl methyl cellulose), acrylic compounds (eg, polyacrylamide). , Polymethacrylamide, modified polyacrylamide, etc.) and polyethylene compounds (eg, polyethylene oxide,
Polyethylene glycol, etc.) is indicated. The above compounds may be used alone or in combination of two or more. In addition, there are admixtures for underwater concrete that contain the above compounds, such as "Sea Better" (manufactured by Sankyo Kasei Kogyo Co., Ltd.), "UWB" (manufactured by Sankyo Petrochemical Co., Ltd.), "Akris 1".
2 "(manufactured by Nisso Master Builders) and" USCA "(manufactured by Shin-Etsu Chemical Co., Ltd.) can also be used.
上記材料を用いて混和材をつくるが，そのさいの割合は
無水石こう23.0〜99.9重量％，水溶性高分子化合物77.0
〜0.1重量％（いずれも内割）が目安となる。前記配合
において，無水石こうが23.0重量％未満では強度の伸び
が悪く，また99.9重量％を超えると相対的に水溶性高分
子化合物の配合量が少なすぎてノロ層の発生防止効果が
弱まり好ましくない。An admixture is made using the above materials, the proportion of which is anhydrous gypsum 23.0-99.9% by weight, water-soluble polymer compound 77.0
A guideline is ~ 0.1% by weight (both of which are percentages). In the above composition, if the anhydrous gypsum is less than 23.0% by weight, the elongation of strength is poor, and if it exceeds 99.9% by weight, the compounding amount of the water-soluble polymer compound is relatively too small and the effect of preventing the formation of noro layer is weakened. .
混和材の製造方法は特に限定されるものではなく，慣用
の混合方法で無水石こうと水溶性高分子化合物を混合す
ればよい。The method for producing the admixture is not particularly limited, and the anhydrous gypsum and the water-soluble polymer compound may be mixed by a conventional mixing method.
上記によってつくられた本発明の混和材はコンクリート
原料として使用されるセメント100重量部に対し,0.5〜2
6重量部添加するのが適当であり,0.5重量部未満ではノ
ロ層発生防止効果も強度増進も小さく，また26重量部を
超えると水溶性高分子化合物の量が多くなり過ぎて，か
えって強度低下をまねき好ましくない。The admixture of the present invention produced by the above is 0.5 to 2 with respect to 100 parts by weight of cement used as a concrete raw material.
It is appropriate to add 6 parts by weight, and if it is less than 0.5 parts by weight, the effect of preventing the formation of noro layer and the increase in strength are small, and if it exceeds 26 parts by weight, the amount of the water-soluble polymer compound becomes too large and the strength is rather lowered. It is not preferable.
上記混和材の添加方法は特に限定されるものではなく，
通常行われているコンクリート原料の混練のさいに適宜
に行えばよい。The method of adding the admixture is not particularly limited,
It may be appropriately carried out during the conventional kneading of concrete raw materials.
第１表に示す原材料，無水石こうおよび水溶性高分子化
合物を用いて第２表に示す割合に配合し，慣用のコンク
リートミキサーに投入して混練した。得られた混練物を
外径200mm,長さ300mmのコンクリート管ができる円筒型
枠に15Kg投入し，遠心成形した。遠心成形の条件は3Gで
２分,11Gで２分，次いで25Gで５分実施した。The raw materials, anhydrous gypsum and water-soluble polymer compound shown in Table 1 were mixed in the proportions shown in Table 2 and put into a conventional concrete mixer and kneaded. The obtained kneaded product was put into a cylindrical formwork capable of forming a concrete pipe having an outer diameter of 200 mm and a length of 300 mm, and 15 kg of the kneaded product was subjected to centrifugal molding. The conditions for centrifugal molding were 3 G for 2 minutes, 11 G for 2 minutes, and 25 G for 5 minutes.
成形後70℃,5時間蒸気養生したのち，放置し24時間後に
脱型した。得た成形体を20℃の水中に６日間浸漬したの
ち,JISA1136「遠心力締固めコンクリートの圧縮強度試
験方法」に準じて圧縮強度試験（材令７日）を行った。
管の肉厚は35〜40mmであった。得られた結果を第２表に
併記した。After molding, it was steam-cured at 70 ° C for 5 hours, left for 24 hours, and then demolded. The molded body thus obtained was immersed in water at 20 ° C. for 6 days, and then subjected to a compression strength test (age 7 days) according to JIS A1136 “Compressive strength test method for centrifugally compacted concrete”.
The wall thickness of the tube was 35-40 mm. The obtained results are also shown in Table 2.
なお比較例１と３については遠心成形後にノロ層が生成
していたのでノロ層を排除したのち前記と同様の方法で
蒸気養生を行い，その結果も同様に併記した。In addition, in Comparative Examples 1 and 3, since the noro layer was formed after the centrifugal molding, the noro layer was removed, and then steam curing was performed in the same manner as described above, and the results are also shown together.
〔発明の効果〕 本発明の混和材をコンクリート原料に添加してコンクリ
ート管を遠心力成形すれば発生するノロ層はほとんどな
く，僅かに発生するノロ層も該コンクリート管へ悪影響
をもたらさないので排除する必要もない。したがってノ
ロ層排除工程は不要となり，混和材はもとよりコンクリ
ート原料の損失もなくなった。 [Effect of the invention] When the admixture of the present invention is added to a concrete raw material and centrifugal force forming is applied to a concrete pipe, almost no noro layer is generated, and even a slight noro layer does not adversely affect the concrete pipe and is eliminated. You don't even have to. Therefore, the noro layer removal process is not required, and the loss of concrete raw materials as well as admixtures is eliminated.
その結果，添加された混和材に含まれている無水石こう
全量がセメントと反応し，従来に比し格段の高強度を発
現させることができ，本願の目的は達成された。As a result, the total amount of anhydrous gypsum contained in the added admixture reacts with the cement, and it is possible to develop a markedly higher strength than in the past, and the object of the present application was achieved.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭51−17218（ＪＰ，Ａ) 特開 昭55−95654（ＪＰ，Ａ) 特開 昭60−16843（ＪＰ，Ａ) 特開 昭60−65755（ＪＰ，Ａ) 実開 昭59−202810（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-51-17218 (JP, A) JP-A-55-95654 (JP, A) JP-A-60-16843 (JP, A) JP-A-60- 65755 (JP, A) Actual development Sho 59-202810 (JP, U)
Claims (1)
添加する蒸気養生工程を含む高強度遠心力成形コンクリ
ート管製造用混和材であって、その組成が無水石こう2
3.0〜99.9重量％および水溶性高分子化合物77.0〜0.1重
量％からなることを特徴とする混和材1. An admixture for producing a high-strength centrifugal-force-formed concrete pipe including a steam curing step of adding 0.5 to 26 parts by weight to 100 parts by weight of cement, the composition of which is anhydrous gypsum 2.
Admixture characterized by comprising 3.0 to 99.9% by weight and a water-soluble polymer compound 77.0 to 0.1% by weight
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61120178A JPH0764606B2 (en) | 1986-05-27 | 1986-05-27 | Admixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61120178A JPH0764606B2 (en) | 1986-05-27 | 1986-05-27 | Admixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62278152A JPS62278152A (en) | 1987-12-03 |
| JPH0764606B2 true JPH0764606B2 (en) | 1995-07-12 |
Family
ID=14779850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61120178A Expired - Lifetime JPH0764606B2 (en) | 1986-05-27 | 1986-05-27 | Admixture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0764606B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995011204A1 (en) * | 1993-10-21 | 1995-04-27 | Chichibu Onoda Cement Corporation | Self-leveling water-base composition |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5117218A (en) * | 1974-08-01 | 1976-02-12 | Denki Kagaku Kogyo Kk | SAKANYOSEMENT OSOSEIBUTSU |
| JPS5595654A (en) * | 1978-05-09 | 1980-07-21 | Toyo Soda Mfg Co Ltd | Production of cement composition for molding secondary product |
| JPS5857386B2 (en) * | 1979-04-02 | 1983-12-20 | 株式会社トクヤマ | mortar composition |
| JPS5734057A (en) * | 1980-08-06 | 1982-02-24 | Asahi Chemical Ind | Concrete compound for centrifugal force molding and centrifugal force molding method using said compound |
| JPS59202810A (en) * | 1983-05-06 | 1984-11-16 | 電気化学工業株式会社 | Manufacture of extra-high strength concrete pile |
| JPS6016843A (en) * | 1983-07-05 | 1985-01-28 | 電気化学工業株式会社 | Mortar, concrete efflorescence preventing agent |
| JPS6065755A (en) * | 1983-09-20 | 1985-04-15 | 電気化学工業株式会社 | Underwater concrete composition |
| JPS61209950A (en) * | 1985-03-12 | 1986-09-18 | 旭硝子株式会社 | Slag-gypsum-cement hardened body |
| JPS62138349A (en) * | 1985-12-13 | 1987-06-22 | 宇部興産株式会社 | Self levelling cement composition |
| JPS62256752A (en) * | 1986-04-28 | 1987-11-09 | 新日鐵化学株式会社 | Self levelling mortar |
-
1986
- 1986-05-27 JP JP61120178A patent/JPH0764606B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62278152A (en) | 1987-12-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |