JP2008230914A - Cement-based composition - Google Patents
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本発明は、流動性に優れるとともに水中不分離性にも優れたセメント系組成物に関するものである。 The present invention relates to a cementitious composition having excellent fluidity and excellent non-separability in water.
従来、シールド工法の直打ちコンクリートライニング材などに使用されるコンクリート組成物として、カチオン性界面活性剤から選ばれる第１の水溶性低分子化合物とアニオン性芳香族化合物から選ばれる第２の水溶性低分子化合物とから成る増粘性混和剤を用いた、早強性に優れるとともに、耐水性にも優れたコンクリート組成物が提案されている（例えば、特許文献１，２参照）。また、上記増粘性混和剤は、トンネル覆工コンクリートの補修を目的として使用されるモルタル組成物にも用いられており、これにより、流動性、自己充填性、材料分離抵抗性に優れるとともに、セルフレベリング性、水中不分離性に優れたモルタル組成物を得ることができる（例えば、特許文献３参照）。
上記第１の水溶性低分子化合物と第２の水溶性低分子化合物とがある一定の割合でセメント中に混入されると、上記第１の水溶性低分子化合物と第２の水溶性低分子化合物とが電気的に配列して擬似ポリマーを形成する。これにより、上記増粘性混和剤は増粘剤として機能して適度な粘性を確保することができるだけでなく、粘性がある程度高くなっても流動性を損なうことがないので、流動性や材料分離抵抗性に優れるとともに、水中不分離性にも優れたセメント組成物を得ることができる。
なお、上記第１の水溶性低分子化合物と第２の水溶性低分子化合物との配合の割合としては、１：１とした場合に最も優れた特性が得られる。
When the first water-soluble low molecular weight compound and the second water-soluble low molecular weight compound are mixed in the cement at a certain ratio, the first water-soluble low molecular weight compound and the second water-soluble low molecular weight compound are mixed. The compounds are electrically arranged to form a pseudopolymer. As a result, the thickening admixture not only functions as a thickener to ensure an appropriate viscosity, but also does not impair the fluidity even if the viscosity increases to some extent. It is possible to obtain a cement composition having excellent properties and excellent non-separability in water.
In addition, when the mixing ratio of the first water-soluble low molecular compound and the second water-soluble low molecular compound is 1: 1, the most excellent characteristics are obtained.
ところで、上記第１の水溶性低分子化合物と上記第２の水溶性低分子化合物とを同時に添加すると、上記第１の水溶性低分子化合物と上記第２の水溶性低分子化合物とが不均質な状態で擬似ポリマーを形成してしまうので、擬似ポリマーを均質な状態で形成させて所望の特性を得るためには長時間の混練が必要となる。
そこで、上記早強性耐水コンクリート組成物を製造する際には、はじめに、セメント、水、細骨材に第２の水溶性低分子化合物を添加して混練して混練物を作製した後、上記混練物に第１の水溶性低分子化合物を添加して再度混練し、最後に粗骨材を加えて混練するようにしていたが、製造に時間がかかるだけでなく、上記第１の水溶性低分子化合物と上記第２の水溶性低分子化合物とは結合し易いので、再混練においてもセメントと十分に混合されない状態でポリマーを形成してしまい、そのため、増粘剤の機能を十分に発揮できないといった問題点があった。
このような問題は、上記早強性耐水コンクリート組成物や高流動モルタル組成物の製造に限らず、他のコンクリート組成物やモルタル組成物などの、上記増粘性混和剤を配合したセメント系組成物を製造する場合にも問題となっている。
By the way, when the first water-soluble low molecular weight compound and the second water-soluble low molecular weight compound are added simultaneously, the first water-soluble low molecular weight compound and the second water-soluble low molecular weight compound are heterogeneous. Since the pseudo polymer is formed in such a state, kneading for a long time is required in order to obtain the desired characteristics by forming the pseudo polymer in a homogeneous state.
Therefore, when producing the early-strength water-resistant concrete composition, first, after adding a second water-soluble low molecular weight compound to cement, water, fine aggregate and kneading to produce a kneaded product, The first water-soluble low molecular weight compound was added to the kneaded product and kneaded again, and finally the coarse aggregate was added and kneaded. Since the low-molecular compound and the second water-soluble low-molecular compound are easily bonded, a polymer is formed in a state where the low-molecular compound is not sufficiently mixed with the cement even in re-kneading, and thus the function of the thickener is sufficiently exhibited. There was a problem that it was not possible.
Such a problem is not limited to the production of the above-mentioned fast-strength water-resistant concrete composition and high-fluidity mortar composition, and other cement compositions containing the above thickening admixture, such as other concrete compositions and mortar compositions. It is also a problem when manufacturing.
本発明は、従来の問題点に鑑みてなされたもので、２種類の水溶性低分子化合物を組合わせて成る増粘性混和剤を用いて製造されるセメント系組成物の特性を更に向上させることを目的とする。 The present invention has been made in view of conventional problems, and further improves the properties of a cementitious composition produced using a thickening admixture comprising a combination of two water-soluble low-molecular compounds. With the goal.
本願の請求項１に記載の発明は、セメントを含む結合材と、水と、骨材と、増粘性混和剤と化学混和剤とを混練して成るセメント系組成物であって、上記増粘性混和剤が、カチオン性界面活性剤から選ばれる第１の水溶性低分子化合物から成る第１の粉体とアニオン性芳香族化合物から選ばれる第２の水溶性低分子化合物から成る第２の粉体とを含有する粉体混和剤であり、上記化学混和剤がカルボキシル基系ポリエーテル系減水剤粉体であって、上記粉体混和剤中の上記第１及び第２の粉体の配合量が、それぞれ、単位水量に対して０．１５〜１．７重量％であり、上記カルボキシル基系ポリエーテル系減水剤粉体の配合量が、結合材に対して０．５〜５．０重量％であることを特徴とするものである。
請求項２に記載の発明は、請求項１に記載の発明において、上記骨材を細骨材のみとしたセメント組成物（モルタル組成物）であって、水結合材比が３０〜７０％、単位水量が３５０〜４５０ｋｇ／ｍ3、上記第１及び第２の粉体の配合量が、それぞれ、単位水量に対して０．１５〜０．５重量％、上記カルボキシル基系ポリエーテル系減水剤粉体の配合量が、結合材に対して０．１〜０．３重量％であることを特徴とするものである。
The invention according to claim 1 of the present application is a cement-based composition obtained by kneading a binder containing cement, water, an aggregate, a thickening admixture, and a chemical admixture. The admixture is a first powder composed of a first water-soluble low-molecular compound selected from cationic surfactants and a second powder composed of a second water-soluble low-molecular compound selected from anionic aromatic compounds. And the chemical admixture is a carboxyl-based polyether water reducing agent powder, and the blending amount of the first and second powders in the powder admixture Are 0.15 to 1.7% by weight with respect to the unit water amount, and the blending amount of the carboxyl group-based polyether water reducing agent powder is 0.5 to 5.0% with respect to the binder. %.
Invention of Claim 2 is the cement composition (mortar composition) which made the said aggregate only the fine aggregate in the invention of Claim 1, Comprising: Water binder ratio is 30 to 70%, The unit water amount is 350 to 450 kg / m 3 , the blending amounts of the first and second powders are 0.15 to 0.5% by weight with respect to the unit water amount, respectively, and the carboxyl group-based polyether water reducing agent. The amount of the powder is 0.1 to 0.3% by weight with respect to the binder.
本発明によれば、セメント系組成物を作製する際にセメントを含む結合材と水と細骨材とに添加する増粘性混和剤とセメント系混和剤とを、それぞれ、カチオン性界面活性剤から選ばれる第１の水溶性低分子化合物から成る第１の粉体とアニオン性芳香族化合物から選ばれる第２の水溶性低分子化合物から成る第２の粉体とを含有する粉体混和剤、及び、カルボキシル基系ポリエーテル系減水剤粉体とするとともに、上記粉体混和剤中の上記第１及び第２の粉体の配合量を、それぞれ、単位水量に対して０．１５〜１．７重量％とし、上記カルボキシル基系ポリエーテル系減水剤粉体の配合量を、結合材に対して０．５〜５．０重量％としたので、優れた流動性、材料分離抵抗性を有するとともに水中不分離性にも優れたセメント系組成物を得ることができる。
また、上記セメント組成物をモルタルとする場合には、水結合材比を３０〜７０％、単位水量を３５０〜４５０ｋｇ／ｍ3、上記第１及び第２の粉体の配合を、それぞれ、単位水量に対して０．１５〜０．５重量％、上記カルボキシル基系ポリエーテル系減水剤粉体の配合量を、結合材に対して０．１〜０．３重量％とすれば、流動性、材料分離抵抗性、及び、水中不分離性に優れたモルタル組成物を得ることができる。
According to the present invention, the thickening admixture and the cement admixture to be added to the binder containing cement, water, and the fine aggregate when preparing the cement-based composition are each obtained from the cationic surfactant. A powder admixture containing a first powder composed of a first water-soluble low-molecular compound selected and a second powder composed of a second water-soluble low-molecular compound selected from an anionic aromatic compound; In addition, the amount of the first and second powders in the powder admixture is set to 0.15-1. 7% by weight and the blending amount of the carboxyl group-based polyether water reducing agent powder is 0.5 to 5.0% by weight with respect to the binder, so that it has excellent fluidity and material separation resistance. And a cement-based composition with excellent inseparability in water Rukoto can.
Further, when the cement composition is mortar, the water binder ratio is 30 to 70%, the unit water amount is 350 to 450 kg / m 3 , and the blending of the first and second powders is a unit. When the blending amount of 0.15 to 0.5% by weight with respect to the amount of water and 0.1 to 0.3% by weight with respect to the binder is used, In addition, a mortar composition having excellent material separation resistance and non-separability in water can be obtained.
以下、本発明の最良の形態係るセメント系組成物について説明する。
本発明の最良の形態に係るセメント系組成物は、セメント、水、細骨材に、セメント混和剤を配合するとともに、増粘性混和剤として、カチオン性界面活性剤から選ばれる第１の水溶性低分子化合物と、アニオン性芳香族化合物から選ばれる第２の水溶性低分子化合物とを含有する混和剤を用いたモルタル組成物である。
本例では、上記第１及び第２の水溶性低分子化合物をそれぞれ乾燥させて粉体の形態とし、これをセメント及び細骨材に混合するとともに、これらに、セメント混和剤であるカルボキシル基系ポリエーテル系減水剤の粉体と膨張材の粉体と消泡剤の粉体とを添加してプレミックしたセメント系混合物粉体を準備し、このセメント系混合物粉体に加水し混練してモルタル組成物を作製する。上記セメント、第１及び第２の水溶性低分子化合物の粉体(以下、増粘性混和剤粉体という)、及び、膨張材が上記細骨材同士を結合する結合材となる。
Hereinafter, the cement-type composition which concerns on the best form of this invention is demonstrated.
The cementitious composition according to the best mode of the present invention contains a cement admixture in cement, water, and fine aggregate, and a first water-soluble substance selected from cationic surfactants as a thickening admixture. It is a mortar composition using an admixture containing a low-molecular compound and a second water-soluble low-molecular compound selected from anionic aromatic compounds.
In this example, the first and second water-soluble low molecular weight compounds are each dried to form a powder, which is mixed with cement and fine aggregate, and these are mixed with a carboxyl group-based cement admixture. A premixed cementitious mixture powder is prepared by adding a polyether-based water reducing agent powder, an expansion material powder and an antifoaming agent powder. A composition is made. The cement, the first and second water-soluble low molecular weight compound powders (hereinafter referred to as thickening admixture powders), and the expansion material serve as a binder for bonding the fine aggregates together.
上記セメントとしては、石灰石・粘土・酸化鉄などを原料とした普通ポルトランドセメント，早強ポルトランドセメント，中庸熱ポルトランドセメント，白色ポルトランドセメントなどのポルトランドセメントや、高炉セメント，フライアッシュセメント，シリカセメントなどの混合セメントを用いることができる。
このとき、水と上記結合材との比である水結合材比（Ｗ／Ｂ）を３０〜７０％とすることが好ましい。水結合材比が３０％未満であると結合材の量が多すぎるため粘性が増加し、必要な流動性が確保できない。また、７０％を超えると結合材の量が過小となって、必要強度が得られないだけでなく、ブリーディングにより耐久性状の品質も低下するので、水結合材比としては３０〜７０％とすることが好ましい。
また、単位水量としては、３５０〜４５０ｋｇ／ｍ3とすることが好ましい。単位水量が３５０ｋｇ／ｍ3を下回る場合には流動性の低下が認められ、４５０ｋｇ／ｍ3を超えるような場合には、材料分離の可能性が高くなるとともに、収縮等の耐久性状が低下するため、単位水量は３５０〜４５０ｋｇ／ｍ3とすることが好ましい。
なお、上記モルタル組成物に用いられる細骨材としては、一般に用いられている粗粒率が２．７前後である細骨材を用いることができるが、粗粒率が２．０５〜２．５０である粗目と細目の中間粒度の細骨材を用いてもよい。
Examples of the above cement include Portland cement such as ordinary Portland cement, early-strength Portland cement, medium heat Portland cement, white Portland cement, blast furnace cement, fly ash cement, silica cement, etc. Mixed cement can be used.
At this time, the water binder ratio (W / B), which is the ratio of water to the binder, is preferably 30 to 70%. If the water binder ratio is less than 30%, the amount of binder is too large, so the viscosity increases and the required fluidity cannot be ensured. Further, if it exceeds 70%, the amount of the binder becomes too small to obtain the required strength, and the quality of the durability is also lowered by bleeding, so the water binder ratio is 30 to 70%. It is preferable.
Moreover, as unit water quantity, it is preferable to set it as 350-450 kg / m < 3 >. When the unit water amount is less than 350 kg / m 3 , a decrease in fluidity is observed, and when it exceeds 450 kg / m 3 , the possibility of material separation increases and the durability such as shrinkage decreases. For this reason, the unit water amount is preferably 350 to 450 kg / m 3 .
In addition, as a fine aggregate used for the said mortar composition, although the coarse particle rate generally used can be used about 2.7, the coarse particle rate is 2.05-2. A fine aggregate with a coarse and fine grain size of 50 may be used.
本発明に用いられる第１の水溶性低分子化合物としては、４級アンモニウム塩型カチオン性界面活性剤が好ましく、特に、アルキルアンモニウム塩を主成分とする添加剤が好ましい。また、第２の水溶性低分子化合物としては、芳香環を有するスルフォン酸塩が好ましく、特に、アルキルアリルスルフォン酸塩を主成分とする添加剤が好ましい。
上記第１の水溶性低分子化合物と上記第２の水溶性低分子化合物との添加量は、単位水量に対して、それぞれ０．１５〜０．５重量％の割合で配合することが好ましい。
上記配合量は、従来の混練を２度の分けて行う場合の第１及び第２の水溶性低分子化合物の配合比よりも低い範囲にある。これは、本例では、上記第１及び第２の水溶性低分子化合物をそれぞれ乾燥させて粉体の形態とし、これをセメント及び細骨材にプレミックスした後に加水・混練することによるものである。すなわち、プレミックスにより、上記第１及び第２の水溶性低分子化合物の粉体がセメントの周りに均一に分布するので、加水・混練時には、上記第１及び第２の水溶性低分子化合物が結合したポリマーが近くにあるセメントと結合するので、上記第１及び第２の水溶性低分子化合物を増粘剤として十分に機能させることができる。
また、本例では、上記セメント混和剤として、上記増粘性混和剤との相溶性に優れたカルボキシル基含有ポリエーテル系減水剤を配合している。
上記カルボキシル基含有ポリエーテル系減水剤の配合量としては、上記結合材に対して、０．１〜０．３重量％とすることが好ましい。
また、膨張材としては石灰複合系膨張材、消泡剤としてはシリコン系の消泡剤を用いることが好ましい。
As the first water-soluble low molecular weight compound used in the present invention, a quaternary ammonium salt type cationic surfactant is preferable, and an additive mainly composed of an alkyl ammonium salt is particularly preferable. The second water-soluble low molecular weight compound is preferably a sulfonate having an aromatic ring, and particularly preferably an additive having an alkylallyl sulfonate as a main component.
The addition amount of the first water-soluble low-molecular compound and the second water-soluble low-molecular compound is preferably blended at a ratio of 0.15 to 0.5% by weight with respect to the unit water amount.
The said compounding quantity exists in the range lower than the compounding ratio of the 1st and 2nd water-soluble low molecular weight compound in the case of performing conventional kneading | mixing twice. In this example, the first and second water-soluble low molecular weight compounds are dried to form powders, premixed with cement and fine aggregate, and then added and kneaded. is there. That is, since the powder of the first and second water-soluble low molecular weight compounds is uniformly distributed around the cement by the premix, the first and second water-soluble low molecular weight compounds are added during the hydration / kneading. Since the bonded polymer binds to a nearby cement, the first and second water-soluble low molecular weight compounds can sufficiently function as a thickener.
In this example, a carboxyl group-containing polyether water reducing agent having excellent compatibility with the thickening admixture is blended as the cement admixture.
As a compounding quantity of the said carboxyl group-containing polyether type water reducing agent, it is preferable to set it as 0.1 to 0.3 weight% with respect to the said binder.
Moreover, it is preferable to use a lime composite type expansion material as the expansion material and a silicon type antifoaming agent as the antifoaming agent.
このように、本実施の形態では、上記第１及び第２の水溶性低分子化合物をそれぞれ乾燥させて粉体の形態とし、これをセメント及び細骨材に混合するとともに、これらに、セメント混和剤であるカルボキシル基系ポリエーテル系減水剤の粉体と膨張材の粉体と消泡剤の粉体とを添加してプレミックしたセメント系混合物粉体を準備し、このセメント系混合物粉体に加水し混練してモルタル組成物を作製するようにしたので、増粘剤増粘剤の機能を十分に発揮できるだけでなく、混練が１回で済むので、製造効率を大幅に向上させることができる。
このとき、上記第１及び第２の水溶性低分子化合物を、それぞれ、単位水量に対して０．１５〜０．５重量％となるように配合するとともに、上記カルボキシル基系ポリエーテル系減水剤粉体を、結合材に対して０．１〜０．３重量％配合することが肝要で、これにより、優れた流動性、材料分離抵抗性を有するとともに水中不分離性にも優れたモルタル組成物を得ることができる。
As described above, in the present embodiment, the first and second water-soluble low molecular weight compounds are dried to form powders, which are mixed with cement and fine aggregates. A cement-based mixture powder prepared by adding a carboxyl group-based polyether water reducing agent powder, an expansion material powder, and an antifoaming agent powder, which is an agent, is prepared. Since the mortar composition is prepared by adding water and kneading, not only can the function of the thickener thickener be fully exerted, but also the kneading is performed only once, so that the production efficiency can be greatly improved. .
At this time, the first and second water-soluble low molecular weight compounds are respectively blended so as to be 0.15 to 0.5% by weight with respect to the unit water amount, and the carboxyl group-based polyether water reducing agent. It is essential that the powder is blended in an amount of 0.1 to 0.3% by weight with respect to the binder, and as a result, the mortar composition has excellent fluidity, material separation resistance, and excellent non-separability in water. You can get things.
なお、上記実施の形態では、増粘性混和剤が配合されたモルタル組成物について説明したが、これに限るものではなく、上記第１及び第２の粉体とセメントと細骨材と膨張材粉体とカルボキシル基系ポリエーテル系減水剤粉体とをプレミックスしたセメント系混合物粉体を準備し、このセメント系混合物粉体と粗骨材と水とを混合して混練すれば、流動性とフレッシュコンクリート経時保持性とに優れるとともに、水中不分離性、材料分離抵抗性にも優れたコンクリート組成物を得ることができる。 In the above-described embodiment, the mortar composition containing the thickening admixture has been described. However, the present invention is not limited to this, and the first and second powders, the cement, the fine aggregate, and the expansion material powder are not limited thereto. If a cement-based mixture powder prepared by premixing a body and a carboxyl-based polyether-based water reducing agent powder is prepared, and the cement-based mixture powder, coarse aggregate and water are mixed and kneaded, fluidity and It is possible to obtain a concrete composition that is excellent in fresh concrete retention with time and excellent in water inseparability and material separation resistance.
セメントと、細骨材と、第１及び第２の水溶性低分子化合物の粉体から成る増粘性混和剤と、カルボキシル基系ポリエーテル系減水剤の粉体と、膨張材の粉体と、消泡剤の粉体とをプレミックスしたセメント系混合物粉体に加水して混練し、モルタル組成物を作製し、水中不分離性、流動性、及び、材料不分離特性について調べた。
このときに使用した材料の詳細は以下の通りである。
セメント ；普通ポルトランドセメント：密度 3.16g/cm3
細骨材 ；珪砂：４号，５号，６号：密度 2.58g/cm3
膨張材 ；エントリガイト・石灰複合系膨張材（商品名；デンカパワーＣＳＡ）
：密度 3.10g/cm3
水 ；水道水：密度 1.00g/cm3
増粘性混和剤 ；アルキルアリルスルフォン酸塩基系及びアルキルアンモニウム系混合特殊分散剤（商品名；ビスコトップ２００Ｐ）
セメント混和剤；カルボキシル基含有ポリエーテル系減水剤（商品名；マイティ２１Ｐ）
消泡剤 ；シリコン系消泡剤（商品名；ＦＳアンチフォームDC2-4248S）
図１は、上記モルタル組成物の、上記第１の粉体と上記第２の粉体とを混合した増粘性混和剤（Ｖｔ）の単位水量に対する添加量（Ｗ×％）と水中気中強度比（％）との関係を調べた結果を示すグラフである。
上記水中気中強度比は、水中で作製した試験体の圧縮強度と気中で作製した試験体の圧縮強度との比で、材齢はいずれも７日である。この比が１００％に近いほど水中で打設した際の水の巻き込みが小さく、水中不分離性に優れている。
一般に、水中気中強度比が７０％以上のものが水中不分離性に優れた材料であるとされている。図１のグラフより、単位水量に対する上記増粘性混和剤（Ｖｔ）の適切な割合の下限は０．１５重量％であることが分かる。また、上記増粘性混和剤（Ｖｔ）の単位水量に対して割合が０．５重量％を超えると、水中気中強度比の大きさはあまり変化しないので、セメント系組成物がモルタルである場合には、上記増粘性混和剤（Ｖｔ）の割合の上限を０．５重量％とすることが好ましい。
また、単位水量に対する増粘性混和剤（Ｖｔ）を０．１５〜０．５重量％としたモルタル組成部を作製し、その流動性について、フロー試験の５分フローにより評価したところ、いずれも、２００〜３００ｍｍの範囲にあり、流動性についても満足していることが分かった。
また、上記モルタル組成物は、ブリーディングも０であり、材料不分離特性についても満足していることが分かった。
A cement, a fine aggregate, a thickening admixture comprising powders of the first and second water-soluble low molecular weight compounds, a powder of a carboxyl group-based polyether water reducing agent, a powder of an expansion material, An antifoaming powder was added to a premixed cement-based mixture powder and kneaded to prepare a mortar composition, which was examined for inseparability in water, fluidity, and material non-separation characteristics.
Details of the materials used at this time are as follows.
Cement: Ordinary Portland cement: Density 3.16g / cm 3
Fine aggregate: Silica sand: No. 4, 5, 6: Density 2.58g / cm 3
Expansion material: Entry guide / lime composite expansion material (trade name: DENKA POWER CSA)
: Density 3.10g / cm 3
Water ： Tap water: Density 1.00g / cm 3
Thickening admixture: Alkyl allyl sulfonate group and alkyl ammonium mixed special dispersant (trade name: Viscotop 200P)
Cement admixture; Carboxyl group-containing polyether water reducing agent (trade name; Mighty 21P)
Antifoaming agent: Silicone antifoaming agent (trade name; FS Antifoam DC2-4248S)
FIG. 1 shows the amount (W ×%) of the thickening admixture (Vt) obtained by mixing the first powder and the second powder of the mortar composition with respect to the unit water amount and the strength in the air. It is a graph which shows the result of having investigated the relationship with ratio (%).
The above-mentioned underwater strength ratio is the ratio between the compressive strength of the test specimen prepared in water and the compressive strength of the test specimen prepared in the air, and the age of each material is 7 days. The closer this ratio is to 100%, the smaller the water entrainment when placing in water, and the better the inseparability in water.
In general, a material having an underwater strength ratio of 70% or more is considered to be a material excellent in water inseparability. From the graph of FIG. 1, it can be seen that the lower limit of the appropriate proportion of the thickening admixture (Vt) relative to the unit amount of water is 0.15% by weight. In addition, when the ratio of the thickening admixture (Vt) to the unit water amount exceeds 0.5% by weight, the magnitude of the strength ratio in water is not changed so much, and the cementitious composition is mortar. For this, the upper limit of the proportion of the thickening admixture (Vt) is preferably 0.5% by weight.
Moreover, the mortar composition part which made the thickening admixture (Vt) with respect to unit water amount 0.15-0.5 weight% was produced, and when it evaluated by the flow for 5 minutes of the flow test about all, It was in the range of 200 to 300 mm, and it was found that the fluidity was also satisfactory.
Moreover, it was found that the mortar composition had zero bleeding and satisfied the material non-separation characteristics.
以上説明したように、本発明によれば、増粘性混和剤の増粘効果を十分に発揮させることができるので、優れた流動性、材料分離抵抗性を有するとともに水中不分離性にも優れたセメント系組成物を得ることができる。また、本願発明のセメント系混合物粉体はプレミックス材であることから、混練が１回で済むので、製造効率を大幅に向上させることができる。 As described above, according to the present invention, the thickening effect of the thickening admixture can be sufficiently exerted, so that it has excellent fluidity and material separation resistance and is excellent in water inseparability. A cementitious composition can be obtained. Moreover, since the cementitious mixture powder of the present invention is a premix material, kneading is only required once, so that the production efficiency can be greatly improved.
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| JP2010127033A (en) * | 2008-11-28 | 2010-06-10 | Kumagai Gumi Co Ltd | Method for infilling filler into lower portion of base plate of base-isolating device |
| JP2010241618A (en) * | 2009-04-02 | 2010-10-28 | Denki Kagaku Kogyo Kk | Super-quick hardening, underwater non-separable cement composition; super-quick hardening, underwater non-separable premixed mortar composition; and underwater non-separable grout mortar |
| WO2010143312A1 (en) * | 2009-06-11 | 2010-12-16 | Kao Corporation | Cement slurry composition |
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| JP2004189978A (en) * | 2002-12-13 | 2004-07-08 | Kao Corp | Rheology modifier kit |
| JP2006176397A (en) * | 2004-11-24 | 2006-07-06 | Kumagai Gumi Co Ltd | High-fluidity mortar composition and its manufacturing method |
| JP2007321064A (en) * | 2006-06-01 | 2007-12-13 | Kao Corp | Rheology modifier |
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| JP2004189978A (en) * | 2002-12-13 | 2004-07-08 | Kao Corp | Rheology modifier kit |
| JP2006176397A (en) * | 2004-11-24 | 2006-07-06 | Kumagai Gumi Co Ltd | High-fluidity mortar composition and its manufacturing method |
| JP2007321064A (en) * | 2006-06-01 | 2007-12-13 | Kao Corp | Rheology modifier |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010127033A (en) * | 2008-11-28 | 2010-06-10 | Kumagai Gumi Co Ltd | Method for infilling filler into lower portion of base plate of base-isolating device |
| JP2010241618A (en) * | 2009-04-02 | 2010-10-28 | Denki Kagaku Kogyo Kk | Super-quick hardening, underwater non-separable cement composition; super-quick hardening, underwater non-separable premixed mortar composition; and underwater non-separable grout mortar |
| WO2010143312A1 (en) * | 2009-06-11 | 2010-12-16 | Kao Corporation | Cement slurry composition |
| US8728229B2 (en) | 2009-06-11 | 2014-05-20 | Kao Corporation | Cement slurry composition |
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