JPS6065755A - Underwater concrete composition - Google Patents
Underwater concrete compositionInfo
- Publication number
- JPS6065755A JPS6065755A JP17390583A JP17390583A JPS6065755A JP S6065755 A JPS6065755 A JP S6065755A JP 17390583 A JP17390583 A JP 17390583A JP 17390583 A JP17390583 A JP 17390583A JP S6065755 A JPS6065755 A JP S6065755A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- water
- underwater
- ceracola
- anhydrous
- 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
Links
Landscapes
- Underground Or Underwater Handling Of Building Materials (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は耐海水性のすぐれた水中コンクリート組成物に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underwater concrete composition with excellent seawater resistance.
あらかじめ練り混ぜられたコンクリートを水中に打設す
る場合、コンクリートが水との接触により分離を生じ、
打設されたコンクリートが不均一となり所定の力学性状
、水密性状を確保することは難しい。それ故、トレミー
管、コンクリートポンプ、パケット等水との接触を回避
する特別な装置が用いられているが、実際には種々の要
因によってコンクリートが水で洗われ、分離して、硬化
体にならなかったり、著しく強度が低下したりするので
、コンクリートの水中施工は難しい技術の一つであった
。When pouring pre-mixed concrete into water, the concrete may separate due to contact with water.
The poured concrete becomes uneven and it is difficult to ensure the specified mechanical properties and watertight properties. Therefore, special equipment is used to avoid contact with water, such as tremie pipes, concrete pumps, and packets, but in reality, various factors can cause concrete to be washed with water, separated, and hardened. Underwater construction of concrete has been a difficult technique because it may not work or its strength may be significantly reduced.
これらの点を改善して、簡単に水中コンクリートを施工
する方法としては、水溶性高分子を添加して水中を自由
落下させ、コンクリートを打設することが既に知られて
いる(DE2326647)。As a method for easily constructing underwater concrete by improving these points, it is already known to add a water-soluble polymer and allow the concrete to fall freely in water to cast concrete (DE2326647).
しかし上記の方法を海洋構造物あるいは護岸構造物など
海水と接触するような箇所で使用する場合には、コンク
リートの耐海水性が問題と々る。また所定の強度とセル
フレベリング性を確保するためには、単位水量を大幅に
、例えば50Kg/m’も増加しなければならず、この
単位水量で通常の強度を得るためには100に9/m’
もの多量の単位セメント量を増加しなければならない欠
点がある。However, when the above method is used in places that come into contact with seawater, such as offshore structures or seawall structures, the seawater resistance of concrete becomes a problem. In addition, in order to secure the specified strength and self-leveling property, the unit water volume must be increased significantly, for example by 50 kg/m', and in order to obtain the normal strength with this unit water volume, 100 to 9/m m'
There is a drawback that the amount of cement per unit must be increased by a large amount.
本発明は、水と接触しても分離を起こさないような、す
ぐれた分離抵抗性を有するとともに、所定の強度を満足
しつつ水セメント比を増加させ流動性を改善することが
でき、しかもすぐれた耐海水性を有する水中コンクリー
ト組成物を提供することを目的とする。The present invention has excellent separation resistance such that separation does not occur even when it comes into contact with water, and can increase the water-cement ratio and improve fluidity while satisfying a predetermined strength. The purpose of the present invention is to provide an underwater concrete composition having high seawater resistance.
即ち、本発明は、水溶性高分子、消泡剤及び無水セラコ
ラ含有物及び/又は仮焼間ばんが添加されてなる耐海水
性のすぐれた水中コンクリート組成物である。That is, the present invention is an underwater concrete composition with excellent seawater resistance, which is made by adding a water-soluble polymer, an antifoaming agent, an anhydrous ceracola-containing material, and/or a calcining filler.
本発明で添加物として使用される水溶性高分子とは、粘
着性をコンクリートに付与して水中での分離抵抗性を高
める物質であって、例えばポリアクリルアンド、ポリエ
チビンオキシド、ポリビニルアルコール、及びメチルヒ
ドロキシエチルセルロース、ヒドロキシエチルセルロー
ス、メチルセルロース、ヒドロキシプロピルセルロース
等のセルロースエーテル類等である。The water-soluble polymer used as an additive in the present invention is a substance that imparts adhesion to concrete and increases its resistance to separation in water, such as polyacrylamide, polyethibine oxide, polyvinyl alcohol, and These include cellulose ethers such as methylhydroxyethylcellulose, hydroxyethylcellulose, methylcellulose, and hydroxypropylcellulose.
水溶性高分子の添加量は、水溶性高分子の種類、分子量
、置換度等によっても、又、目的とする打設環境条件に
よっても異なるが、一般的にはセメントに対して5重量
%以下である。同、水溶性高分子は1種を使用しても良
く、2種以上を組み合せても良いが、練り混ぜの面から
溶解性の改善されているヒドロキシエチルセルロースや
メチルセルロースが好捷しい。The amount of water-soluble polymer added varies depending on the type, molecular weight, degree of substitution, etc. of the water-soluble polymer, and also depending on the intended casting environment conditions, but generally it is 5% by weight or less based on the cement. It is. Similarly, water-soluble polymers may be used singly or in combination of two or more, but hydroxyethylcellulose and methylcellulose are preferred because of their improved solubility from the standpoint of kneading.
消泡剤とは水浴性高分子の添加によって著しく増大する
コンクリートの空気量を減少させ、圧縮強度の低下を抑
えるもので、例えば日本油脂■商品名「ニラカン・テイ
スホーム」、第一工業製薬■商品名「アンチフロスF」
、東芝シリコーン■商品名rTsA−732」、サンノ
プコ■商品名r SN−Defoamer 14HP。Antifoaming agents reduce the amount of air in concrete, which increases significantly due to the addition of water bathing polymers, and suppress the decline in compressive strength. Product name: “Anti-Floss F”
, Toshiba Silicone ■Product name rTsA-732'', San Nopco ■Product name r SN-Defoamer 14HP.
24HPJなどがあり、練り混ぜの面から粉体系のもの
が好ましい。消泡剤の添加量はその種類によっても異な
るが、水溶性高分子に対して0.3〜10重量%である
。24HPJ, etc., and powder-based ones are preferable from the standpoint of kneading. The amount of antifoaming agent added varies depending on the type of antifoaming agent, but is 0.3 to 10% by weight based on the water-soluble polymer.
無水セラコラ含有物は無水セラコラ単独でも良いが、無
水セラコラを主成分とし、それにシリカフラワー、活性
白土等の微粉末を混和したもので、例えば電気化学工業
■商品名「デンカΣ10’00J、日本セメント■商品
名「アサノース−パーミックス」等として市販されてい
るものでも良い。仮焼間ばんを用いても同様の効果は期
待できる。しかし、凝結コントロールが難しいので無水
セラコラ含有物の使用が好ましい。The anhydrous ceracola-containing material may be anhydrous ceracola alone, but it is one that has anhydrous ceracola as its main component and mixed with fine powder such as silica flower or activated clay. ■Items commercially available under the trade name "Athanose-Permix" or the like may also be used. A similar effect can be expected even if a calcination interval is used. However, since it is difficult to control coagulation, it is preferable to use a product containing anhydrous ceracola.
無水セラコラ含有物及び/又は仮焼間ばんの添加量は、
セメントに対してSO3換算で3重量%以下好ましくは
0.5〜2重量%とするのが耐海水性の面から好捷しい
。The amount of anhydrous ceracola-containing material and/or calcination buffer is as follows:
From the viewpoint of seawater resistance, it is preferable that the amount is 3% by weight or less, preferably 0.5 to 2% by weight, calculated as SO3 based on the cement.
無水セラコラ含有物及び/又は仮焼間ばんの添加による
耐海水性白玉の原因は、C3AおよびC,AFのCa
S O,による初期の安定化にあり、また強度増進の原
因は初期材令におけるエトリンガイトの生成により硬化
体の細孔構造が小さい方向へ移行し、組織が緻密化する
ことにらると考えられる。The cause of seawater resistant white balls due to the addition of anhydrous Ceracola-containing materials and/or calcination intermediates is due to Ca in C3A, C, and AF.
It is thought that the reason for the increase in strength is that the pore structure of the hardened material shifts to a smaller size due to the formation of ettringite at the initial stage of the material, and the structure becomes denser. .
以上の添加物はコンクリートの練り混ぜ時あるいは、予
め練り混ぜられたコンクリートに別々に添加しても良く
、又同時に添加することも可能である。但し、練り混ぜ
時の便利さを考慮す、ると全て粉末で一括添加するのが
好ましい。The above-mentioned additives may be added at the time of mixing concrete or separately to pre-mixed concrete, or they may be added at the same time. However, considering convenience during kneading and mixing, it is preferable to add all powders at once.
同、本発明の水中コンクリートを調合するにあたっての
セメント、骨材等のコンクリート材料の配合条・件は通
常の配合条件でよく、単位セメント量は320〜5o
o Ky/靜程度で単位水量は170 Kg/m”以上
とすることが好ましい。Similarly, when mixing the underwater concrete of the present invention, the mixing conditions for concrete materials such as cement and aggregate may be the usual mixing conditions, and the unit cement amount is 320 to 5 oz.
o It is preferable that the unit water amount is 170 Kg/m'' or more at a Ky/quiet level.
通常、コンクリ−1・は打設後締め固めを行なうが、水
中施工においては、通常の場合と異なり締め固め作業の
困難な場合も多い。しかし、本発明の水中コンクリート
(以下単にコンクリートという)は分離抵抗性が犬であ
るので、コンクリート中の単位水量を充分確保してやる
ことができ、それにより、セルフレベリング性が高まり
、自重によりコンクリートが充填するようになる。さら
に本発明においては、無水セラコラ含有物及び/又は仮
焼間ばんの効果により、所定の強度を満足させながら水
セメント比を増加させることができるため、セルフレベ
リング性の面でさらに好ましい。Normally, concrete is compacted after it is poured, but in underwater construction, compaction work is often difficult, unlike in normal cases. However, since the underwater concrete of the present invention (hereinafter simply referred to as concrete) has excellent separation resistance, it is possible to secure a sufficient amount of water per unit of water in the concrete, thereby increasing self-leveling properties and filling the concrete with its own weight. I come to do it. Further, in the present invention, the water-cement ratio can be increased while satisfying a predetermined strength due to the effect of the anhydrous Ceracola-containing material and/or the calcination interval, which is more preferable in terms of self-leveling properties.
同一般に使、用されている遅延剤、AE剤、減水剤など
の化学混和剤及びポゾラン類等の併用も可能である。ま
た本発明は海水中での使用に限定されるものではなく、
淡水中でも充分使用できるものでるる。It is also possible to use chemical admixtures such as retardants, AE agents, and water reducing agents, which are commonly used, and pozzolans. Furthermore, the present invention is not limited to use in seawater;
It can be used even in fresh water.
以上説明したように、本発明の水中コンクリート組成物
は分離抵抗性が大きく、耐海水性もすぐれているためと
くに海洋等において、海水中にコンクリートを直接自由
落下させて、打設することができ、また、海水面に接し
ている海岸付近の構造物の構築おるいは補修が簡単にで
きる。さらに本発明の水中コンクリート組成物を用いれ
ば、コンクリートを水中に打設するだめの特別な配慮を
行なう必要がなく、工期の短縮、工費の低減の面からも
非常に好ましい。As explained above, the underwater concrete composition of the present invention has high separation resistance and excellent seawater resistance, so it can be placed by directly free-falling concrete into seawater, especially in the ocean. Furthermore, structures near the coast that are in contact with the sea surface can be easily constructed or repaired. Further, if the underwater concrete composition of the present invention is used, there is no need to take special consideration when placing concrete underwater, which is very preferable from the viewpoint of shortening the construction period and reducing construction costs.
以下実施例をあげてさらに説明する。The present invention will be further explained below with reference to Examples.
実施例1)
表−1の実験篇1〜4のように水溶性高分子、消泡剤及
び無水セラコラ含有物を添加してコンクリートを練り混
ぜ、気中及び水中作製供試体を作製した。気中作製供試
体は気中で型枠中にコンクリートを流し込み、木づちで
たたき作製し、水中作製供試体は予め水中に沈めた型枠
中にコンクリートを流し込み、引き上げた抜本づちでた
たき作製した。Example 1) As shown in Experiments 1 to 4 in Table 1, a water-soluble polymer, an antifoaming agent, and an anhydrous Ceracola-containing material were added and mixed with concrete to prepare in-air and underwater specimens. Specimens made in the air were made by pouring concrete into a mold in the air and pounded with a mallet, and specimens made underwater were made by pouring concrete into a form that had been submerged in water beforehand and then tapping it with a hammer. .
コ7り’V−トのセルフレベリング性判定。Judging the self-leveling property of Ko7ri'V-to.
ため、流動性テストを実施した。即ち、スランプコーン
をゆっくり引き上げだときのスランプ及びフローを測定
した。又硬化体の性状を見るため、水中及び気中作製供
試体の圧縮強度及び水中作製供試体の耐海水性を測定し
た。耐海水性試験は5%Mg5O,溶液を用いて実施し
た。結果を表−2、表−3に示す。Therefore, a liquidity test was conducted. That is, the slump and flow were measured when the slump cone was slowly pulled up. In addition, in order to examine the properties of the cured product, the compressive strength of the specimens produced in water and in the air, and the seawater resistance of the specimens produced in water were measured. The seawater resistance test was conducted using a 5% Mg5O solution. The results are shown in Table-2 and Table-3.
表−1は配合であり、表−2はフレッシュコンクリート
の性状及び硬化体の圧縮強度の結果であり、表−3は5
%MgSO4溶液中に所定材令浸漬したコンクリートの
圧縮強度の変化である。Table 1 shows the mixture, Table 2 shows the properties of fresh concrete and compressive strength of the hardened concrete, and Table 3 shows the results of 5
% MgSO4 solution for a given age.
比較例
表−1の実験扁6〜8のように配合して、実施例1)と
同様に実験を行なった。結果を表−2及び表−3に示す
。Comparative Example Experiments were conducted in the same manner as in Example 1) by blending the test plates 6 to 8 in Table 1. The results are shown in Table-2 and Table-3.
実施例2)
表−1の実験扁5の・配合において、無水セラコラ含有
物のかわりに仮焼間ばんを用いた以外は実施例1)と同
様に行なった。Example 2) The same procedure as in Example 1) was carried out except that in the formulation of experimental plate 5 in Table 1, a calcination spacing was used instead of the anhydrous ceracola-containing material.
く使用材料〉
消泡剤 :サンノプロ社商品名r14HPJ仮焼明ばん
:昭和鉱業社商品名「グイミックス」細骨材 (S)
:相模用産天然砂 5胡下−k (w) : 7し4首
皆
表−1
※1) SOs換算対セメント重量%
戦)対セメント重量%
※3)仮焼間ばんSO8換算対セメント重魚チ表−2
表−3Materials used> Antifoaming agent: Sanno Pro Co., Ltd. trade name r14HPJ Calcined Alum: Showa Mining Co., Ltd. trade name “Guimix” fine aggregate (S)
: Natural sand produced for Sagami 5 k (w) : 7 and 4 heads - 1 *1) SOs equivalent vs. cement weight % War) vs. cement weight % *3) Calcined masonry SO8 equivalent vs. cement weight Uochi Table-2 Table-3
Claims (1)
は仮焼間ばんが添加されてなる耐海水性のすぐれた水中
コンクリート組成物。An underwater concrete composition having excellent seawater resistance and containing a water-soluble polymer, an antifoaming agent, an anhydrous ceracola-containing material, and/or a calcining filler.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17390583A JPS6065755A (en) | 1983-09-20 | 1983-09-20 | Underwater concrete composition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17390583A JPS6065755A (en) | 1983-09-20 | 1983-09-20 | Underwater concrete composition |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6065755A true JPS6065755A (en) | 1985-04-15 |
JPH0443864B2 JPH0443864B2 (en) | 1992-07-17 |
Family
ID=15969249
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17390583A Granted JPS6065755A (en) | 1983-09-20 | 1983-09-20 | Underwater concrete composition |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6065755A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62278152A (en) * | 1986-05-27 | 1987-12-03 | 日本セメント株式会社 | Admixing material |
JPH01116113A (en) * | 1987-10-27 | 1989-05-09 | Sato Kogyo Co Ltd | Construction work of underwater banking |
US20210381072A1 (en) * | 2018-10-25 | 2021-12-09 | Nippon Steel Corporation | Coating liquid for forming insulation coating for grain-oriented electrical steel sheets, grain-oriented electrical steel sheet, and method for producing grain-oriented electrical steel sheet |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5669250A (en) * | 1979-11-02 | 1981-06-10 | Denki Kagaku Kogyo Kk | Cement composition |
JPS5781530A (en) * | 1980-11-05 | 1982-05-21 | Mitsui Petrochem Ind Ltd | Placement work of underwater concrete and form therefor |
JPS5869760A (en) * | 1981-10-16 | 1983-04-26 | 株式会社エヌエムビー | Concrete composition for underwater construction |
JPS58115051A (en) * | 1981-12-29 | 1983-07-08 | 株式会社トクヤマ | Admixing agent for underwater concrete |
-
1983
- 1983-09-20 JP JP17390583A patent/JPS6065755A/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5669250A (en) * | 1979-11-02 | 1981-06-10 | Denki Kagaku Kogyo Kk | Cement composition |
JPS5781530A (en) * | 1980-11-05 | 1982-05-21 | Mitsui Petrochem Ind Ltd | Placement work of underwater concrete and form therefor |
JPS5869760A (en) * | 1981-10-16 | 1983-04-26 | 株式会社エヌエムビー | Concrete composition for underwater construction |
JPS58115051A (en) * | 1981-12-29 | 1983-07-08 | 株式会社トクヤマ | Admixing agent for underwater concrete |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62278152A (en) * | 1986-05-27 | 1987-12-03 | 日本セメント株式会社 | Admixing material |
JPH01116113A (en) * | 1987-10-27 | 1989-05-09 | Sato Kogyo Co Ltd | Construction work of underwater banking |
US20210381072A1 (en) * | 2018-10-25 | 2021-12-09 | Nippon Steel Corporation | Coating liquid for forming insulation coating for grain-oriented electrical steel sheets, grain-oriented electrical steel sheet, and method for producing grain-oriented electrical steel sheet |
Also Published As
Publication number | Publication date |
---|---|
JPH0443864B2 (en) | 1992-07-17 |
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