JP2015059070A - Bubble-containing cement composition, production method of bubble-containing cement composition and construction method using bubble-containing cement composition - Google Patents

Bubble-containing cement composition, production method of bubble-containing cement composition and construction method using bubble-containing cement composition Download PDF

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JP2015059070A
JP2015059070A JP2013194559A JP2013194559A JP2015059070A JP 2015059070 A JP2015059070 A JP 2015059070A JP 2013194559 A JP2013194559 A JP 2013194559A JP 2013194559 A JP2013194559 A JP 2013194559A JP 2015059070 A JP2015059070 A JP 2015059070A
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cement composition
containing cement
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JP6198126B2 (en
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賢司 宮脇
Kenji Miyawaki
賢司 宮脇
吉原 正博
Masahiro Yoshihara
正博 吉原
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Sumitomo Osaka Cement Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a bubble-containing cement composition which dose not lose an intrinsic property of the bubble-containing cement composition such as excellent flowability and constructability, as much as possible and furthermore can be filled into a cavity portion such as a pore and a gap in construction under environment with water, and to provide a production method of the bubble-containing cement composition and a construction method using the bubble-containing cement composition.SOLUTION: The bubble-containing cement composition contains cement, a foaming agent and water, the content of the foaming agent is 0.01 mass% or more based on the total amount of the composition and the water content is 15 mass% or more based on the total amount of the composition, the content of the foaming agent is 0.06 mass% or less based on the total amount of the composition or the water content is 36 mass% based on the total amount of the composition, and the density of the composition is 1.0 t/mto 1.48 t/m.

Description

本発明は、エアミルクやエアモルタル等の気泡を含有する気泡含有セメント組成物、気泡含有セメント組成物の製造方法、及びこれを用いた施工方法に関する。   The present invention relates to a bubble-containing cement composition containing bubbles such as air milk and air mortar, a method for producing a bubble-containing cement composition, and a construction method using the same.

近年、セメントミルクやモルタルに起泡剤を含有させて気泡を発生させたエアミルクやエアモルタルが用いられている。エアミルクやエアモルタルは、気泡を含むのでセメントミルクやモルタルに比べて流動性が良好で施工箇所における充填部分の隅々にまで充填することができる等、施工性に優れ、またセメントミルクやモルタルに比べて密度が小さく軽量であるので施工箇所への荷重負担も軽減される等の特性を有することから、空洞充填工法や軽量盛土工法等に用いられている。このようなエアミルク及びエアモルタル等の気泡含有セメント組成物に関する技術として、たとえば特許文献1や特許文献2のような特許出願がなされている。   In recent years, air milk or air mortar in which bubbles are generated by adding a foaming agent to cement milk or mortar has been used. Air milk and air mortar contain air bubbles, so it has better fluidity than cement milk and mortar, and can be filled to every corner of the filling area at the construction site. Compared to the low density and light weight, it has characteristics such as reducing the load on the construction site, so it is used for the cavity filling method and the lightweight embankment method. As a technique related to the bubble-containing cement composition such as air milk and air mortar, patent applications such as Patent Document 1 and Patent Document 2 have been filed.

特許文献1には、超速硬セメントに所定量の水及び必要な混和剤(エアモルタルの場合にはさらに細骨材)を混練してセメントミルクまたはセメントモルタルを形成し、それとは別に、起泡剤と水とで気泡を形成し、前記セメントミルクまたはセメントモルタルと、前記気泡とを混合するエアミルクまたはエアモルタルの製造方法が記載されている。   In Patent Document 1, a cement milk or cement mortar is formed by kneading a predetermined amount of water and a necessary admixture (in addition, fine aggregate in the case of air mortar) into ultra-high speed cement. A method for producing air milk or air mortar is described in which bubbles are formed by an agent and water, and the cement milk or cement mortar and the bubbles are mixed.

また特許文献2には、所定量の粉末起泡剤をセメント等と予め混合し、これに水を添加して起泡させることにより気泡モルタル(エアモルタル)を製造する方法が記載されている。また、特許文献2には、気泡を強固にするために、粉末起泡剤とともに粘土鉱物等を併用することが記載されている。   Patent Document 2 describes a method for producing a bubble mortar (air mortar) by mixing a predetermined amount of a powder foaming agent with cement or the like in advance and adding water to the foamed foam to cause foaming. Patent Document 2 describes that clay minerals and the like are used in combination with a powder foaming agent in order to strengthen bubbles.

ところで、エアミルクやエアモルタル等の気泡含有セメント組成物が用いられる上記空洞充填工法には、地上からボーリング孔等を介して地下の空洞部分に気泡含有セメント組成物を充填することで該地下空洞部分を閉塞して地盤の安定化を図る地下空洞充填工法と称される工法や、トンネルの地山と矢板の間の隙間が放置されることにより残存している空洞部分に気泡含有セメント組成物を充填してトンネルにおけるひび割れや圧縮破壊を防止するトンネル空洞充填工法と称される工法、その他、土や砂等で埋め戻しができないような種々の箇所の空洞部分に気泡含有セメント組成物を充填する空洞充填工法等がある。   By the way, in the above-mentioned cavity filling method in which a bubble-containing cement composition such as air milk or air mortar is used, the underground cavity portion is filled with the bubble-containing cement composition from the ground via a borehole or the like. An underground cement filling method, which is intended to stabilize the ground by blocking the ground, and a bubble-containing cement composition to the remaining cavity due to leaving the gap between the ground of the tunnel and the sheet pile Filling the void-containing cement composition into the cavity of various places that cannot be backfilled with soil, sand, etc., other than the tunnel cavity filling method that prevents cracking and compressive fracture in the tunnel There is a cavity filling method.

これらの空洞充填工法のうち、地下空洞充填工法においては、空洞部分に水が流入することがあり、水が流入した空洞部分に気泡含有セメント組成物を充填しなければならないことになる。すなわち、地中の透水層には、地下水によって飽和している帯水層と称される地層があり、そのような帯水層の環境下に空洞部分があると、その空洞部分には必然的に水が流入することとなるので、水が流入した空洞部分に気泡含有セメント組成物を充填しなければならないのである。   Among these cavity filling methods, in the underground cavity filling method, water may flow into the hollow portion, and the bubble-containing cement composition must be filled into the hollow portion into which the water has flowed. In other words, in the underground permeable layer, there is an aquifer called an aquifer saturated with groundwater, and if there is a cavity in the environment of such an aquifer, the cavity is inevitable. Therefore, it is necessary to fill the cavity portion into which the water has flowed with the bubble-containing cement composition.

しかしながら、上記特許文献1や特許文献2で用いられるエアミルクやエアモルタル等の気泡含有セメント組成物は密度が0.3〜0.8t/m3程度であり、水よりも軽量であるので、上記のように水が流入した空洞部分に充填する場合に、気泡含有セメント組成物が水に浮いて空洞部分に好適に充填することができないという問題が生じていた。 However, since the bubble-containing cement composition such as air milk and air mortar used in Patent Document 1 and Patent Document 2 has a density of about 0.3 to 0.8 t / m 3 and is lighter than water, When filling the cavity portion into which water has flowed as described above, there is a problem that the bubble-containing cement composition floats on the water and cannot be suitably filled into the cavity portion.

このような問題は、上記のような地下空洞充填工法に限らず、帯水環境下で孔や隙間等にエアミルクやエアモルタル等の気泡含有セメント組成物を充填しなければならない箇所での施工には同様に生じることが考えられるが、いずれにしても、上記従来の気泡含有セメント組成物は、密度が0.3〜0.8t/m3程度であるので、上記のような帯水環境下では施工し難いという問題があった。 Such a problem is not limited to the above-mentioned underground cavity filling method, but is applied to a place where a bubble-containing cement composition such as air milk or air mortar must be filled into holes or gaps in an aquifer environment. In any case, the conventional bubble-containing cement composition has a density of about 0.3 to 0.8 t / m 3. Then there was a problem that construction was difficult.

特開2011−73918号公報JP 2011-73918 A 特開2004−83339号公報JP 2004-83339 A

本発明は、前記問題点に鑑み、流動性が良好で施工性に優れているという、エアミルクやエアモルタル等の気泡含有セメント組成物が本来有する特性を極力損なわないようにしつつ、上記のような帯水環境下での施工において、孔や隙間等の空洞部分に好適に充填することができる気泡含有セメント組成物、気泡含有セメント組成物の製造方法および気泡含有セメント組成物を用いた施工方法を提供することを課題とする。   In view of the above-mentioned problems, the present invention avoids the characteristics inherent to the bubble-containing cement composition such as air milk and air mortar, which is excellent in fluidity and workability, as much as possible, as described above. In construction in an aquifer environment, a bubble-containing cement composition that can be suitably filled in a hollow portion such as a hole or a gap, a method for producing a bubble-containing cement composition, and a construction method using the bubble-containing cement composition The issue is to provide.

本発明者等は、気泡含有セメント組成物中の起泡剤又は水の含有量を特定の含有量とし、気泡含有セメント組成物の密度を1.0t/m3以上とすることで、流動性が良好で施工性に優れているという気泡含有セメント組成物が本来有する特性を極力損なわないようにしつつ、さらに帯水環境下における空洞部分に気泡含有セメント組成物を充填する場合に、該気泡含有セメント組成物が水に浮いて空洞部分への充填が困難となるようなことがなく、該空洞部分への充填を好適に行なうことができることを見出し、本発明を完成するに至った。 The inventors set the content of the foaming agent or water in the foam-containing cement composition as a specific content, and the density of the foam-containing cement composition is set to 1.0 t / m 3 or more, thereby improving the fluidity. In the case where the bubble-containing cement composition is filled in the cavity portion in the aquifer environment while preventing the characteristic of the bubble-containing cement composition from being excellent and workability is as much as possible from being lost as much as possible. The present inventors have found that the cement composition does not float in water and makes it difficult to fill the cavity portion, and can be suitably filled into the cavity portion, thereby completing the present invention.

本発明はこのような課題を解決するためになされたもので、本発明の気泡含有セメント組成物は、セメントと、起泡剤と、水とが含まれ、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上で前記水の組成物の総量に対する含有量が15質量%以上36質量%以下であり、密度が1.0t/m3以上1.48t/m3以下であることを特徴とするものである。また他の側面では、本発明の気泡含有セメント組成物は、セメントと、起泡剤と、水とが含まれ、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上0.06質量%以下で前記水の組成物の総量に対する含有量が15質量%以上であり、密度が1.0t/m3以上1.48t/m3以下であることを特徴とするものである。 The present invention has been made to solve such problems, and the bubble-containing cement composition of the present invention contains cement, a foaming agent, and water, and the total amount of the foaming composition. in content is 0.01 mass% or more content relative to the total amount of the water of the composition is at 36 wt% or less than 15 wt%, a density of 1.0 t / m 3 or more 1.48t / m 3 or less for It is characterized by being. In another aspect, the bubble-containing cement composition of the present invention contains cement, a foaming agent, and water, and the content of the foaming agent composition is 0.01% by mass or more and 0% by mass. content relative to the total amount of the water of the composition at .06% by weight or less is at least 15 mass%, and is characterized in that the density is less than 1.0 t / m 3 or more 1.48t / m 3 .

さらに本発明の気泡含有セメント組成物の製造方法は、セメントと、起泡剤と、水とを、
前記起泡剤の組成物の総量に対する含有量が0.01質量%以上で前記水の組成物の総量に対する含有量が15質量%以上36質量%以下となるように混合し、密度が1.0t/m3以上1.48t/m3以下となるように調製することを特徴とするものである。さらに別の側面では、本発明の気泡含有セメント組成物の製造方法は、セメントと、起泡剤と、水とを、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上0.06質量%以下で前記水の組成物の総量に対する含有量が15質量%以上となるように混合し、密度が1.0t/m3以上1.48t/m3以下となるように調製することを特徴とするものである。
Furthermore, the method for producing a foam-containing cement composition of the present invention comprises cement, a foaming agent, and water.
The density of the foaming agent is mixed so that the content with respect to the total amount of the composition is 0.01% by mass or more and the content with respect to the total amount of the water composition is 15% by mass or more and 36% by mass or less. it is characterized in that the preparation so as to 0t / m 3 or more 1.48t / m 3 or less. In still another aspect, the method for producing a foam-containing cement composition according to the present invention includes cement, a foaming agent, and water in a content of 0.01% by mass or more based on the total amount of the foaming composition. content relative to the total amount of the water of the composition at 0.06 wt% or less were mixed so that 15 mass% or more, prepared such that the density is 1.0 t / m 3 or more 1.48t / m 3 or less It is characterized by doing.

さらに本発明の気泡含有セメント組成物を用いた施工方法は、セメントと、起泡剤と、水とを、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上で前記水の組成物の総量に対する含有量が15質量%以上36質量%以下となるように混合し、密度が1.0t/m3以上1.48t/m3以下となるように調製することで気泡含有セメント組成物を得て、前記気泡含有セメント組成物を用いて施工を行なうことを特徴とするものである。さらに別の側面では、本発明の気泡含有セメント組成物を用いた施工方法は、セメントと、起泡剤と、水とを、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上0.06質量%以下で前記水の組成物の総量に対する含有量が15質量%以上となるように混合し、密度が1.0t/m3以上1.48t/m3以下となるように調製することで気泡含有セメント組成物を得て、前記気泡含有セメント組成物を用いて施工を行なうことを特徴とするものである。 Furthermore, in the construction method using the bubble-containing cement composition of the present invention, the content of the foam, the foaming agent and the water with respect to the total amount of the foaming composition is 0.01% by mass or more. aerated by content relative to the total amount of the composition is mixed in a 15 wt% or more 36 wt% or less, the density is adjusted to be 1.0 t / m 3 or more 1.48t / m 3 or less A cement composition is obtained, and construction is performed using the bubble-containing cement composition. In yet another aspect, the construction method using the bubble-containing cement composition of the present invention comprises a cement, a foaming agent, and water in a content of 0.01 mass relative to the total amount of the foaming composition. % or more content relative to the total amount of the water of the composition at 0.06 wt% or less were mixed so that 15 mass% or more, so that the density is 1.0 t / m 3 or more 1.48t / m 3 or less The foam-containing cement composition is obtained by preparing the foam-containing cement composition, and the construction is performed using the foam-containing cement composition.

起泡剤の含有量は0.01質量%以上とされる。起泡剤の含有量が0.01質量%未満になると、気泡含有セメント組成物として機能させるのに必要な気泡が組成物中に保持されなくなり、結果として気泡含有セメント組成物が本来有する特性である流動性が損なわれるおそれがあるからである。   The content of the foaming agent is 0.01% by mass or more. When the content of the foaming agent is less than 0.01% by mass, the bubbles necessary for functioning as a foam-containing cement composition are not retained in the composition, and as a result, the foam-containing cement composition has the inherent characteristics. This is because some fluidity may be impaired.

また、水の含有量は15質量%以上とされる。水の含有量が15質量%未満になると、気泡含有セメント組成物が本来有する特性である流動性が損なわれるおそれがあるからである。   The water content is 15% by mass or more. This is because if the water content is less than 15% by mass, the fluidity, which is a characteristic inherent to the bubble-containing cement composition, may be impaired.

一方、起泡剤の含有量又は水の含有量の上限は、そのいずれかが設定されればよく、具体的には、起泡剤の含有量が0.06質量%以下とされるか、又は水の含有量が36質量%以下とされることで、気泡含有セメント組成物の密度が小さくならないようにされ、その密度が1.0t/m3以上とされることとなる。 On the other hand, the upper limit of the content of the foaming agent or the content of water should just be set, specifically, whether the content of the foaming agent is 0.06 mass% or less, Alternatively, when the water content is 36% by mass or less, the density of the bubble-containing cement composition is prevented from being reduced, and the density is 1.0 t / m 3 or more.

このように、本発明の気泡含有セメント組成物においては、起泡剤の組成物の総量に対する含有量が0.01質量%以上で水の組成物の総量に対する含有量が15質量%以上であり、起泡剤の組成物の総量に対する含有量が0.06質量%以下であるか、又は水の組成物の総量に対する含有量が36質量%以下であり、密度が1.0t/m3以上であるので、流動性が良好で施工性に優れているという、気泡含有セメント組成物が本来有する特性を極力損なわないようにしつつ、さらに帯水環境下における空洞部分に本発明の気泡含有セメント組成物を充填する場合に、該気泡含有セメント組成物が水に浮いて空洞部分への充填が困難となるようなことがなく、該空洞部分への充填を好適に行なうことができる。 Thus, in the bubble-containing cement composition of the present invention, the content of the foaming agent relative to the total amount of the composition is 0.01% by mass or more and the content relative to the total amount of the water composition is 15% by mass or more. The content of the foaming agent with respect to the total amount of the composition is 0.06% by mass or less, or the content of water with respect to the total amount of the composition is 36% by mass or less, and the density is 1.0 t / m 3 or more. Therefore, the bubble-containing cement composition of the present invention is further applied to the cavity portion in the aquifer environment while preventing the characteristic of the bubble-containing cement composition from being excellent in fluidity and workability as much as possible. When filling an object, the bubble-containing cement composition does not float on water and it becomes difficult to fill the cavity part, and the cavity part can be suitably filled.

一方、本発明の気泡含有セメント組成物は、密度が1.48t/m3以下であるので、材料分離をおこしにくい。 On the other hand, since the density of the bubble-containing cement composition of the present invention is 1.48 t / m 3 or less, it is difficult to separate materials.

尚、本発明でいう気泡含有セメント組成物とは、起泡剤によって形成された気泡を含むセメント組成物を意味し、たとえばエアモルタルやエアミルクがこれに含まれる。   The bubble-containing cement composition referred to in the present invention means a cement composition containing bubbles formed by a foaming agent, and includes, for example, air mortar and air milk.

本発明によれば、流動性が良好で施工性に優れているという、エアミルクやエアモルタル等の気泡含有セメント組成物が本来有する特性を極力損なわないようにしつつ、帯水環境下での施工において、孔や隙間等の空洞部分に好適に充填することができる気泡含有セメント組成物、気泡含有セメント組成物の製造方法および気泡含有セメント組成物を用いた施工方法を提供することができる。   According to the present invention, in the construction under the aquifer environment, while avoiding as much as possible the characteristics inherent to the bubble-containing cement composition such as air milk and air mortar, which has good fluidity and excellent workability. In addition, it is possible to provide a bubble-containing cement composition that can be suitably filled in hollow portions such as holes and gaps, a method for producing the bubble-containing cement composition, and a construction method using the bubble-containing cement composition.

以下、本発明の実施形態について説明する。先ず、本発明の気泡含有セメント組成物についての実施形態を説明する。   Hereinafter, embodiments of the present invention will be described. First, an embodiment of the bubble-containing cement composition of the present invention will be described.

本実施形態の気泡含有セメント組成物は、セメントと、起泡剤と、水とが含まれ、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上で前記水の組成物の総量に対する含有量が15質量%以上36質量%以下であり、密度が1.0t/m3以上1.48t/m3以下とされているものである。また他の実施形態の気泡含有セメント組成物は、セメントと、起泡剤と、水とが含まれ、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上0.06質量%以下で前記水の組成物の総量に対する含有量が15質量%以上であり、密度が1.0t/m3以上1.48t/m3以下とされているものである。 The bubble-containing cement composition of this embodiment includes cement, a foaming agent, and water, and the content of the foaming agent is 0.01% by mass or more with respect to the total amount of the composition of the water. amount contained in the total amount is at 36 wt% or less than 15 wt%, in which density is a 1.0 t / m 3 or more 1.48t / m 3 or less. The bubble-containing cement composition according to another embodiment includes cement, a foaming agent, and water, and the content of the foaming agent with respect to the total amount of the foaming composition is 0.01% by mass or more and 0.06% by mass. content relative to the total amount of the water of the composition% or less is 15% by mass or more, in which density is a 1.0 t / m 3 or more 1.48t / m 3 or less.

気泡含有セメント組成物とは、起泡剤によって形成された気泡を含むセメント組成物をいい、たとえばセメントと水とを含むセメントスラリーに、起泡剤で形成した気泡を含有させたエアミルク、エアモルタル等が挙げられる。   The bubble-containing cement composition refers to a cement composition containing bubbles formed by a foaming agent. For example, air milk or air mortar containing bubbles formed by a foaming agent in a cement slurry containing cement and water. Etc.

セメントとしては、公知のセメントであれば特に制限されることはないが、例えば、普通ポルトランドセメント、早強ポルトランドセメント、超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、耐硫酸塩ポルトランドセメント、白色ポルトランドセメント等のポルトランドセメント;高炉セメント、フライアッシュセメント、シリカセメント等の混合セメント;超速硬セメント、アルミナセメントなどが挙げられる。中でも、高炉セメント、普通セメント等が、可使時間の調整が容易であること、および低コストであることから好ましい。   The cement is not particularly limited as long as it is a publicly known cement. Portland cement such as blast furnace cement, fly ash cement, silica cement and the like mixed cement; ultrafast cement, alumina cement and the like. Among them, blast furnace cement, ordinary cement, and the like are preferable because the pot life can be easily adjusted and the cost is low.

起泡剤としては、例えばアルファオレフィンスルホン酸系の起泡剤が用いられる。アルファオレフィンスルホン酸系の起泡剤を用いることで、気泡含有セメント組成物中の気泡を安定的に維持することができ、予め、起泡剤と起泡剤以外のセメント組成物成分とを混合した気泡含有セメント組成物の状態で施工現場まで搬送することができる。さらに、比較的短時間で所望の強度が発現され、施工後、比較的早期に施工箇所の供用が開始できる。   As the foaming agent, for example, an alpha olefin sulfonic acid-based foaming agent is used. By using an alpha olefin sulfonic acid-based foaming agent, the bubbles in the foam-containing cement composition can be stably maintained, and the foaming agent and the cement composition components other than the foaming agent are mixed in advance. It can be conveyed to the construction site in the state of the aerated bubble-containing cement composition. Furthermore, a desired strength is expressed in a relatively short time, and the construction site can be used in a relatively early stage after construction.

そのアルファオレフィンスルホン酸系の起泡剤としては、例えば、アルファオレフィンスルホン酸ナトリウムの粉末等が例示される。このような起泡剤として、例えば、ライオン株式会社製の商品名「リポランPJ−400」、ライオン株式会社製の商品名「リポランPB−800」などを用いることができる。前記起泡剤は、粉末であることには限定されるものではないが、粉末起泡剤である場合には、予め、セメント等の粉体成分と混合しておくことができ、製造しやすいため好ましい。   Examples of the alpha olefin sulfonic acid foaming agent include sodium alpha olefin sulfonate powder. As such a foaming agent, for example, trade name “Lipolane PJ-400” manufactured by Lion Corporation, trade name “Lipolane PB-800” manufactured by Lion Corporation, and the like can be used. The foaming agent is not limited to being a powder, but in the case of a powder foaming agent, it can be mixed with a powder component such as cement in advance and is easy to manufacture. Therefore, it is preferable.

さらに起泡剤には、たとえば上記アルファオレフィンスルホン酸ナトリウムのような起泡成分以外の成分が含有されていてもよい。ここで起泡剤に起泡成分とともに起泡成分以外の成分が含まれている場合、上記起泡剤の組成物の総量に対する含有量(質量%)は、組成物の総量に対する起泡成分の含有量(質量%)であることを意味する。起泡成分としては、アルファオレフィンスルホン酸塩、アルキルベンゼンスルホン酸塩、アルキル硫酸エステル塩、及び脂肪酸石鹸の群より選ばれた1種又は2種以上が挙げられる。   Further, the foaming agent may contain components other than the foaming component such as sodium alpha olefin sulfonate. Here, when the foaming agent contains a component other than the foaming component together with the foaming component, the content (% by mass) of the foaming agent relative to the total amount of the composition is that of the foaming component relative to the total amount of the composition. It means content (mass%). Examples of the foaming component include one or more selected from the group of alpha olefin sulfonate, alkyl benzene sulfonate, alkyl sulfate ester salt, and fatty acid soap.

本実施形態の気泡含有セメント組成物においては、さらに粘土鉱物が含まれていてもよい。粘土鉱物が含まれることで、組成物中で気泡が保持され易くなるという利点がある。   The foam-containing cement composition of the present embodiment may further contain clay minerals. By including the clay mineral, there is an advantage that bubbles are easily retained in the composition.

粘土鉱物としては、層状粘土鉱物、繊維状粘土鉱物、非晶質粘土鉱物、シリカ鉱物、長石、沸石、ドロマイト、及びこれらの焼成物、並びにこれらの2種以上の混合物が挙げられる。中でも、層状粘土鉱物、繊維状粘土鉱物、およびこれらの焼成物からなる群から選択される1種以上である粘土鉱物が好ましい。かかる層状粘土鉱物、繊維状粘土鉱物、非晶質粘土鉱物、およびこれらの焼成物からなる群から選択される1種以上の粘土鉱物は、気泡の安定性をより良好にすることができ、且つ施工後により短時間で所望の強度が得られるからである。前記層状粘土鉱物としては、カオリン鉱物、蛇紋岩及び類縁鉱物、パイロフィライト、タルク、雲母粘土鉱物、緑泥岩、バーミキュライト、スメクタイト、ベントナイト等が挙げられる。前記繊維状粘土鉱物としては、セピオライト、アタパルジャイト等が挙げられる。前記粘土鉱物の焼成物としては、カオリンの焼成物であるメタカオリン、ハロイサイトの焼成物であるメタハロイサイト等が挙げられる。   Examples of clay minerals include layered clay minerals, fibrous clay minerals, amorphous clay minerals, silica minerals, feldspar, zeolite, dolomite, and fired products thereof, and mixtures of two or more thereof. Especially, the clay mineral which is 1 or more types selected from the group which consists of layered clay mineral, fibrous clay mineral, and these baked products is preferable. One or more clay minerals selected from the group consisting of such layered clay minerals, fibrous clay minerals, amorphous clay minerals, and fired products thereof can make the bubble stability better, and This is because a desired strength can be obtained in a shorter time after the construction. Examples of the layered clay mineral include kaolin mineral, serpentine and related minerals, pyrophyllite, talc, mica clay mineral, chlorite, vermiculite, smectite, bentonite and the like. Examples of the fibrous clay mineral include sepiolite and attapulgite. Examples of the calcined product of clay mineral include metakaolin, which is a calcined product of kaolin, and metahalloysite, which is a calcined product of halloysite.

前記粘土鉱物の中でも、ベントナイト、アタパルジャイト等が気泡の安定性が良好になるという観点から、および、比較的短時間での所望の強度が得られやすいという観点から、好ましい。   Among the clay minerals, bentonite, attapulgite, and the like are preferable from the viewpoint of improving the stability of the bubbles and from the viewpoint that a desired strength can be easily obtained in a relatively short time.

前記粘土鉱物は、膨潤力が15ml/2g以上50ml/2g以下であることが好ましい。前記粘土鉱物の膨潤力が前記範囲である場合には、より気泡の安定性が良好になる。尚、前記膨潤力は、日本ベントナイト工業会の標準試験方法(JBAS−104)に規定される方法に準拠して測定される膨潤力をいう。   The clay mineral preferably has a swelling power of 15 ml / 2 g or more and 50 ml / 2 g or less. When the swelling power of the clay mineral is in the above range, the stability of the bubbles becomes better. In addition, the said swelling power means the swelling power measured based on the method prescribed | regulated to the standard test method (JBAS-104) of Japan Bentonite Industry Association.

本実施形態の気泡含有セメント組成物においては、組成物の総量に対する起泡剤の含有量は0.01質量%以上とされる。起泡剤の含有量が0.01質量%未満になると、気泡含有セメント組成物として機能させるのに必要な気泡が組成物中に保持されなくなり、結果として気泡含有セメント組成物が本来有する特性である流動性が損なわれるおそれがあるからである。また、水の含有量は15質量%以上とされる。水の含有量が15質量%未満になると、気泡含有セメント組成物が本来有する特性である流動性が損なわれるおそれがあるからである。   In the foam-containing cement composition of the present embodiment, the content of the foaming agent relative to the total amount of the composition is 0.01% by mass or more. When the content of the foaming agent is less than 0.01% by mass, the bubbles necessary for functioning as a foam-containing cement composition are not retained in the composition, and as a result, the foam-containing cement composition has the inherent characteristics. This is because some fluidity may be impaired. The water content is 15% by mass or more. This is because if the water content is less than 15% by mass, the fluidity, which is a characteristic inherent to the bubble-containing cement composition, may be impaired.

一方、組成物の総量に対する起泡剤の含有量は0.06質量%以下とされるか、又は水の含有量は36質量%以下とされ、いずれかの含有量の上限値が設定されることで、気泡含有セメント組成物の密度が小さくならないようにされ、その密度が1.0t/m3以上とされることとなる。 On the other hand, the content of the foaming agent with respect to the total amount of the composition is set to 0.06% by mass or less, or the content of water is set to 36% by mass or less, and an upper limit value of any content is set. Thus, the density of the bubble-containing cement composition is prevented from being reduced, and the density is set to 1.0 t / m 3 or more.

尚、気泡含有セメント組成物には上述のように粘土鉱物が含まれていてもよく、その場合には上述のように組成物中で気泡が保持され易くなるので、組成物中に含有させる起泡剤の含有量が少なくて済むこととなる。このことから、気泡含有セメント組成物に粘土鉱物が含まれている場合には、主として起泡剤の含有量が組成物の総量に対して0.06質量%以下となるように調整されて気泡含有セメント組成物の密度が1.0t/m3以上とされる。一方、気泡含有セメント組成物に粘土鉱物が含まれていない場合には、組成物中で気泡が保持されにくくなるので、起泡剤の含有量を少なくしても密度が1.0t/m3以上とならない可能性がある。このことから、気泡含有セメント組成物に粘土鉱物が含まれていない場合には、主として組成物の総量に対する水の含有量が36質量%以下とされて気泡含有セメント組成物の密度が1.0t/m3以上とされる。 The bubble-containing cement composition may contain a clay mineral as described above. In this case, the bubbles are easily retained in the composition as described above. The amount of foaming agent will be small. From this, when clay-containing minerals are contained in the bubble-containing cement composition, the bubbles are mainly adjusted so that the content of the foaming agent is 0.06% by mass or less with respect to the total amount of the composition. The density of the containing cement composition is 1.0 t / m 3 or more. On the other hand, when no clay mineral is contained in the foam-containing cement composition, it is difficult for the foam to be retained in the composition. Therefore, even if the content of the foaming agent is reduced, the density is 1.0 t / m 3. This may not be the case. From this, when the foam-containing cement composition does not contain clay minerals, the content of water is mainly 36% by mass or less with respect to the total amount of the composition, and the density of the foam-containing cement composition is 1.0 t. / M 3 or more.

気泡含有セメント組成物に粘土鉱物が含まれる場合、組成物の総量に対する粘土鉱物の含有量は5質量%以上30質量%以下であることが好ましい。5質量%未満になると、材料分離を起こし易くなり、その一方で30質量%を超えると混練しにくくなるからである。   When the foam-containing cement composition contains a clay mineral, the content of the clay mineral is preferably 5% by mass or more and 30% by mass or less based on the total amount of the composition. If the amount is less than 5% by mass, material separation is likely to occur. On the other hand, if the amount exceeds 30% by mass, kneading becomes difficult.

さらに組成物の総量に対するセメントの含有量は35質量%以上50質量%以下であることが好ましい。35質量%未満になると混練不可となるおそれがある一方で、50質量%を超えると材料分離するおそれがあるからである。この観点からは、40質量%以上50質量%以下であることがより好ましい。   Further, the cement content relative to the total amount of the composition is preferably 35% by mass or more and 50% by mass or less. If the amount is less than 35% by mass, kneading may not be possible, while if it exceeds 50% by mass, the material may be separated. From this viewpoint, the content is more preferably 40% by mass or more and 50% by mass or less.

本実施形態のセメント組成物には、さらに、遅延剤、減水剤などを含んでいてもよい。また、気泡含有セメント組成物としてエアモルタルを得る場合には、骨材をさらに含んでいてもよい。   The cement composition of this embodiment may further contain a retarder, a water reducing agent, and the like. Moreover, when obtaining air mortar as a bubble containing cement composition, the aggregate may be further included.

次に、本発明の気泡含有セメント組成物の製造方法の実施形態について説明する。   Next, an embodiment of a method for producing a bubble-containing cement composition of the present invention will be described.

本実施形態の気泡含有セメント組成物の製造方法においては、セメントと、起泡剤と、水とを、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上で前記水の組成物の総量に対する含有量が15質量%以上であり、前記起泡剤の組成物の総量に対する含有量が0.06質量%以下であるか、又は前記水の組成物の総量に対する含有量が36質量%以下となるように混合し、密度が1.0t/m3以上1.48t/m3以下となるように調製する。 In the method for producing a foam-containing cement composition of the present embodiment, the content of the foam, the foaming agent, and water is 0.01% by mass or more with respect to the total amount of the foaming composition. The content with respect to the total amount of the composition is 15% by mass or more, the content with respect to the total amount of the composition of the foaming agent is 0.06% by mass or less, or the content with respect to the total amount of the composition of water is It was mixed so that 36 wt% or less, the density is adjusted to be 1.0 t / m 3 or more 1.48t / m 3 or less.

具体的には、起泡剤が粉末である場合には、粉体成分であるセメントと、起泡剤とを混合して混合粉体とし、該混合粉体に、所定の水を加えて混練して気泡含有セメント組成物を得る方法が挙げられる。或いは、前記粉体成分の各成分と、水とを一度に混合して混練することで気泡含有セメント組成物を得る方法が挙げられる。いずれの方法においても、前記起泡剤が水に溶解することで気泡が発生し、混練によって該気泡をスラリー状のセメント組成物中に均一に混合することで、エアミルクあるいはエアモルタル等の気泡含有セメント組成物を製造する。前記混練は、例えば、数L〜数10Lの容器に、各材料を入れて、ハンドミキサー等で混練りすることで行なうことができる。   Specifically, when the foaming agent is a powder, cement as a powder component and the foaming agent are mixed to form a mixed powder, and predetermined water is added to the mixed powder and kneaded. And a method for obtaining a bubble-containing cement composition. Or the method of obtaining the bubble-containing cement composition by mixing and knead | mixing each component of the said powder component and water at once is mentioned. In any method, bubbles are generated by dissolving the foaming agent in water, and the bubbles are uniformly mixed in the slurry-like cement composition by kneading, thereby containing bubbles such as air milk or air mortar. A cement composition is produced. The kneading can be performed, for example, by putting each material in a container of several liters to several tens of liters and kneading with a hand mixer or the like.

また粉体成分として、前記セメントとともに粘土鉱物を用いることも可能である。   Moreover, it is also possible to use a clay mineral with the said cement as a powder component.

尚、前記粉体成分として、充填材、骨材(エアモルタルの場合)などをさらに加えてもよく、液体成分として、遅延剤、減水剤などを水にさらに加えてもよい。   In addition, a filler, an aggregate (in the case of air mortar) or the like may be further added as the powder component, and a retarder, a water reducing agent or the like may be further added to water as the liquid component.

前記充填材を用いる場合に、重油を用いた乾燥を行っていない充填材を用いることが好ましい。充填材としては、例えばけい石粉、けい砂粉(エアモルタルの場合)などが挙げられ、これらは微粉であることが好ましい。硫黄酸化物及び窒素酸化物が付着していない充填材を用いることにより、気泡の安定性をより高めることができる。これは、乾燥時に発生する硫黄酸化物(SOx)及び窒素酸化物(NOx)が気泡を潰す要因の1つであると考えられるためである。 When the filler is used, it is preferable to use a filler that has not been dried using heavy oil. Examples of the filler include silica powder and silica sand powder (in the case of air mortar), and these are preferably fine powder. By using a filler to which sulfur oxides and nitrogen oxides are not attached, the stability of bubbles can be further improved. This is because sulfur oxide (SO x ) and nitrogen oxide (NO x ) generated during drying are considered to be one of the factors that crush bubbles.

次に、前述のように製造された気泡含有セメント組成物を施工現場で用いて施工を行なう施工方法について説明する。本実施形態のセメント組成物の施工方法では、セメントと、起泡剤と、水とを、前記起泡剤が組成物の総量に対する含有量が0.01質量%以上で前記水の組成物の総量に対する含有量が15質量%以上であり、前記起泡剤の組成物の総量に対する含有量が0.06質量%以下であるか、又は前記水の組成物の総量に対する含有量が36質量%以下となるように混合し、密度が1.0t/m3以上1.48t/m3以下となるように調製することで気泡含有セメント組成物を得て、前記気泡含有セメント組成物を用いて施工を行なう。 Next, a construction method for performing construction using the bubble-containing cement composition produced as described above at the construction site will be described. In the construction method of the cement composition of the present embodiment, cement, a foaming agent, and water are contained in the water composition at a content of 0.01% by mass or more with respect to the total amount of the foaming agent. The content with respect to the total amount is 15% by mass or more, and the content with respect to the total amount of the foaming agent composition is 0.06% by mass or less, or the content with respect to the total amount of the water composition is 36% by mass. were mixed so that the following density to obtain a bubble-containing cement composition be prepared such that 1.0 t / m 3 or more 1.48t / m 3 or less, by using the bubble-containing cement composition Perform construction.

この場合、製造された気泡含有セメント組成物においては、起泡剤の組成物の総量に対する含有量が0.01質量%以上で水の組成物の総量に対する含有量が15質量%以上であり、起泡剤の組成物の総量に対する含有量が0.06質量%以上であるか、又は水の組成物の総量に対する含有量が36質量%以上であり、密度が1.0t/m3以上1.48t/m3以下とされているので、このような気泡含有セメント組成物を帯水環境下の施工現場に搬送し、そのような施工現場で空洞部分に気泡含有セメント組成物を充填するような場合、流動性が良好で施工性に優れているという、エアミルクやエアモルタル等の気泡含有セメント組成物が本来有する特性を極力損なわないようにしつつ、帯水環境下において気泡含有セメント組成物を空洞部分に好適に充填することができる。 In this case, in the produced bubble-containing cement composition, the content with respect to the total amount of the composition of the foaming agent is 0.01% by mass or more and the content with respect to the total amount of the water composition is 15% by mass or more, The content of the foaming agent with respect to the total amount of the composition is 0.06% by mass or more, or the content with respect to the total amount of the water composition is 36% by mass or more, and the density is 1.0 t / m 3 or more. .48t / m 3 or less, and such a bubble-containing cement composition is transported to a construction site in an aquifer environment, and the void-containing cement composition is filled in the cavity portion at such a construction site. In such a case, the foam-containing cement composition should be used in an aquifer environment while avoiding as much as possible the characteristics inherent to the foam-containing cement composition such as air milk and air mortar. cavity The portion can be suitably filled.

また、本実施形態の気泡含有セメント組成物の施工方法では、予め工場などの施工現場から離れた場所において気泡含有セメント組成物を前述のような製造方法によって製造して、その後、施工現場に搬送して、施工現場で気泡含有セメント組成物として用いることができる。   Moreover, in the construction method of the foam-containing cement composition of the present embodiment, the foam-containing cement composition is produced in advance by a production method as described above at a place away from the construction site such as a factory, and then transported to the construction site. And it can be used as a bubble-containing cement composition at a construction site.

このように気泡含有セメント組成物を施工現場に搬送する場合、気泡含有セメント組成物中に粘土鉱物が含まれていると、気泡が組成物中に維持され易く、予め、セメントミルクまたはセメントモルタル等のスラリー状のセメント組成物と、起泡剤とを別々に搬送せずに事前に混合した状態で搬送できるので、搬送コストも抑制できる。さらに、搬送に先立って混合した材料の必要分のみを製造、搬送すればよいので、材料ロスが小さく、コスト的に有利である。また、施工現場では、別々の搬送媒体で搬送されたスラリー状のセメント組成物と起泡剤とを専用装置で混合する必要がなく、よって、施工現場において設備の小型化を図ることができる。   When the foam-containing cement composition is transported to the construction site as described above, if the clay-containing mineral is contained in the foam-containing cement composition, the foam is easily maintained in the composition, such as cement milk or cement mortar. Since the slurry-like cement composition and the foaming agent can be conveyed in a state of being mixed in advance without being separately conveyed, the conveyance cost can also be suppressed. Furthermore, since only the necessary amount of the mixed material needs to be manufactured and transported prior to transportation, material loss is small, which is advantageous in terms of cost. In addition, at the construction site, it is not necessary to mix the slurry-like cement composition and the foaming agent conveyed by different conveyance media with a dedicated device, and thus the equipment can be downsized at the construction site.

前記気泡含有セメント組成物を施工現場へ搬送する方法は特に限定されないが、例えば、ミキサー車、モービル車等の搬送車両を用いることが挙げられる。数L〜数10m3の工事規模の場合には、モービル車またはミキサー車を用い、数10m3以上の工事規模の場合には、ミキサー車を用いることが好ましい。あるいは、製造場所から施工現場まで接続された移送パイプ等の搬送車両以外の搬送装置を用いて搬送してもよい。 Although the method of conveying the said bubble containing cement composition to a construction site is not specifically limited, For example, using conveyance vehicles, such as a mixer vehicle and a mobile vehicle, is mentioned. In the case of a construction scale of several L to several tens of m 3 , it is preferable to use a mobile vehicle or a mixer truck, and in the case of a construction scale of several tens of m 3 or more, it is preferable to use a mixer truck. Or you may convey using conveyance apparatuses other than conveyance vehicles, such as a transfer pipe connected from the manufacturing place to the construction site.

前記施工現場に搬送された気泡含有セメント組成物は、そのまま、施工現場で施工してもよく、あるいは、施工現場でさらに水等を添加してから施工してもよい。   The bubble-containing cement composition conveyed to the construction site may be applied at the construction site as it is, or may be applied after further adding water or the like at the construction site.

このように、本実施形態のセメント組成物、気泡含有セメント組成物の製造方法及び気泡含有セメント組成物の施工方法は、施工場所に大型設備を必要としないので、施工量が小規模(例えば100m3未満)の場合に特に有利である。 Thus, since the cement composition of this embodiment, the manufacturing method of a bubble containing cement composition, and the construction method of a bubble containing cement composition do not require a large installation in a construction place, a construction amount is small (for example, 100 m Less than 3 ) is particularly advantageous.

尚、本実施形態は以上のとおりであるが、今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は前記説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。   In addition, although this embodiment is as above, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

以下に実施例を示して、本発明にかかる気泡含有セメント組成物としてのセメントミルクについて、さらに具体的に説明するが、本発明は以下の実施例に限定されるものではない。   Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to the following examples.

(セメント組成物の含有)
本実施例で用いるセメントミルク用のセメント組成物として表1の含有量の実施例1乃至5、並びに比較例1乃至8を準備した。尚、表1において、セメント組成物の各材料の含有量の単位はgである。また起泡剤と水の含有量のカッコ内の数値は質量%である。さらに使用した各材料の詳細は以下のとおりである。
(Contains cement composition)
Examples 1 to 5 and Comparative Examples 1 to 8 having the contents shown in Table 1 were prepared as cement compositions for cement milk used in this example. In Table 1, the unit of the content of each material of the cement composition is g. Moreover, the numerical value in the parenthesis of content of a foaming agent and water is the mass%. Further details of each material used are as follows.

(材料)
セメント:高炉セメント(商品名「高炉セメントB種」、住友大阪セメント株式会社製)
粘土鉱物:ベントナイト(ホージュン社製 スーパークレイ:膨潤力30ml/2g)
粉末起泡剤:アルファオレフィンスルホン酸ナトリウム(商品名「リポランPB−800」、ライオン株式会社製)
(material)
Cement: Blast furnace cement (Brand name "Blast furnace cement type B", manufactured by Sumitomo Osaka Cement Co., Ltd.)
Clay mineral: Bentonite (Hojoen Super Clay: swelling power 30ml / 2g)
Powder foaming agent: sodium alpha olefin sulfonate (trade name “Lipolane PB-800”, manufactured by Lion Corporation)

Figure 2015059070
Figure 2015059070

(製造方法)
まず、粉体成分として、セメント、粘土鉱物および粉末起泡剤を容量5Lの容器に入れてゴム栓2個を入れて振とうして混合した後、容量5Lの容器で表1に記載の各分量の水を加えて、ハンドミキサー(商品名「UT−1305」、マキタ社製)を用いて1300rpmで2分間混練して、エアミルクを得た。
(Production method)
First, as a powder component, cement, clay mineral, and powder foaming agent are put into a container with a capacity of 5 L, and two rubber stoppers are put and mixed by shaking. An amount of water was added and kneaded at 1300 rpm for 2 minutes using a hand mixer (trade name “UT-1305”, manufactured by Makita) to obtain air milk.

(評価方法)
各実施例および比較例について、密度、空気量、フロー値、性状および圧縮強度を以下のように測定した。
《密度/空気量》
混練から2分後の各エアミルクの総重量および体積を測定した。
密度は、前記総重量と体積とから求めた。体積については、各原料粉体及び水の密度から算出した。さらに、空気量は、密度及び重量から求めた。
《フロー値》
フロー値は、NEXCO試験法313に記載のフロー試験に準じて測定した。
《圧縮強度》
圧縮強度は、JIS A 1216に記載の土の一軸圧縮試験方法に準じた方法を用いて、材齢1日、7日、28日の圧縮強度を測定した。
(Evaluation method)
About each Example and the comparative example, the density, the air content, the flow value, the property, and the compressive strength were measured as follows.
<< Density / Air volume >>
The total weight and volume of each air milk 2 minutes after kneading were measured.
The density was determined from the total weight and volume. The volume was calculated from the density of each raw material powder and water. Furthermore, the amount of air was determined from density and weight.
<Flow value>
The flow value was measured according to the flow test described in NEXCO test method 313.
《Compressive strength》
The compressive strength was determined by measuring the compressive strength at 1 day, 7 days and 28 days of age using a method according to the uniaxial compression test method of soil described in JIS A1216.

《性状》
混練直後のエアミルクをブリーディング袋に充填し、3時間後の性状を目視で観察し、消泡、分離、底部の水が溜まりの有無を評価した。
<Properties>
Air milk immediately after kneading was filled in a bleeding bag, and the properties after 3 hours were visually observed to evaluate the presence or absence of defoaming, separation, and accumulation of water at the bottom.

これらの結果を表2及び表3に示した。表2において、密度の単位はt/m3、フロー値の単位はmm、総重量の単位はg、体積の単位はcm3、空気量の単位はcm3である。また表3において圧縮強度の単位はkN/m2である。 These results are shown in Tables 2 and 3. In Table 2, the unit of density is t / m 3 , the unit of flow value is mm, the unit of total weight is g, the unit of volume is cm 3 , and the unit of air amount is cm 3 . In Table 3, the unit of compressive strength is kN / m 2 .

Figure 2015059070
Figure 2015059070

Figure 2015059070
Figure 2015059070

(評価結果)
表1及び表2に示すように、実施例1では水の含有量を比較例1乃至3と同じ1000g(組成物の総重量に対して約50質量%)としたが、起泡剤の含有量は0.5g(組成物の総重量に対して0.025質量%)とし、比較例1乃至3の起泡剤の含有量6.0g(組成物の総重量に対して比較例1乃至3でいずれも0.30質量%)に比べて少なくした。この結果、組成物の密度は比較例1で0.0627t/m3、比較例2で0.0682t/m3、比較例3で0.717t/m3といずれも1.0t/m3未満であったが、実施例1では1.091t/m3で1.0t/m3以上であった。
(Evaluation results)
As shown in Tables 1 and 2, in Example 1, the content of water was set to 1000 g (about 50% by mass with respect to the total weight of the composition) as in Comparative Examples 1 to 3, but the foaming agent was contained. The amount is 0.5 g (0.025 mass% with respect to the total weight of the composition), and the content of the foaming agent of Comparative Examples 1 to 3 is 6.0 g (Comparative Examples 1 to 3 with respect to the total weight of the composition). 3 and less than 0.30 mass%). As a result, the density of the composition of Comparative Example 1 in 0.0627t / m 3, Comparative Example 2 0.0682t / m 3, Comparative Example 3 in 0.717t / m 3 Both the 1.0 t / m less than 3 was but was in example 1, 1.091t / m 3 1.0t / m 3 or more.

また、比較例4、5でも水の含有量を比較例1乃至3と同じ1000g(組成物の総重量に対して約50質量%)としたが、比較例4では起泡剤の含有量を4.0g(組成物の総重量に対して0.20質量%)とし、比較例5では起泡剤の含有量を2.0g(組成物の総重量に対して0.010質量%)とし、比較例1乃至3に比べて少なくした。この結果、比較例4では組成物の密度は0.793t/m3、比較例5では0.856t/m3となり、いずれも比較例1乃至3よりも密度が高くなったが、1.0t/m3以上となることはなかった。 In Comparative Examples 4 and 5, the content of water was set to 1000 g (about 50% by mass with respect to the total weight of the composition) as in Comparative Examples 1 to 3, but in Comparative Example 4, the content of the foaming agent was 4.0 g (0.20 mass% with respect to the total weight of the composition), and in Comparative Example 5, the content of the foaming agent is 2.0 g (0.010 mass% with respect to the total weight of the composition). , Compared with Comparative Examples 1 to 3. As a result, the density of the composition in Comparative Example 4 was 0.793 t / m 3 and that in Comparative Example 5 was 0.856 t / m 3 , both of which were higher than Comparative Examples 1 to 3, but 1.0 t / M 3 or more.

さらに、比較例7では水の含有量を900g(組成物の総重量に対して約47質量%)とし、比較例1乃至3と同程度としたが、起泡剤の含有量を10.0g(組成物の総重量に対して0.52質量%)とし、比較例1乃至3より多くした。この結果、比較例7の組成物の密度は0.0610t/m3で、比較例1乃至3より低くなった。 Furthermore, in Comparative Example 7, the water content was 900 g (about 47% by mass with respect to the total weight of the composition), which was the same as Comparative Examples 1 to 3, but the foaming agent content was 10.0 g. (0.52 mass% with respect to the total weight of the composition), and more than Comparative Examples 1 to 3. As a result, the density of the composition of Comparative Example 7 was 0.0610 t / m 3 , which was lower than Comparative Examples 1 to 3.

一方、実施例2では起泡剤の含有量を比較例1乃至3と同じ6.0g(組成物の総重量に対して0.40質量%)としたが、水の含有量は500g(組成物の総重量に対して33.2質量%)とし、比較例1乃至3の水の含有量に比べて少なくした。この結果、実施例2の組成物の密度は1.135t/m3で1.0t/m3以上であった。また実施例3、4では、それぞれ起泡剤の含有量を4.0g(組成物の総重量に対して0.27質量%)及び3.0g(組成物の総重量に対して0.20質量%)と実施例2に比べて少なくしたが、水の含有量は500g(組成物の総重量に対して33.2質量%、33.3質量%)で実施例2と同じとした。この結果、実施例3、4においても、組成物の密度は1.279t/m3、1.380t/m3で1.0t/m3以上であった。 On the other hand, in Example 2, the content of the foaming agent was 6.0 g (0.40% by mass with respect to the total weight of the composition) as in Comparative Examples 1 to 3, but the water content was 500 g (composition). 33.2% by mass with respect to the total weight of the product), which was less than the water content of Comparative Examples 1 to 3. As a result, the density of the composition of Example 2 were at 1.135t / m 3 1.0t / m 3 or more. In Examples 3 and 4, the content of the foaming agent was 4.0 g (0.27% by mass based on the total weight of the composition) and 3.0 g (0.20% based on the total weight of the composition). The content of water was 500 g (33.2% by mass, 33.3% by mass with respect to the total weight of the composition), which was the same as that of Example 2. As a result, also in Example 3 and 4, the density of the composition 1.279t / m 3, was in 1.380t / m 3 1.0t / m 3 or more.

一方、比較例6でも起泡剤の含有量を比較例1乃至3と同じ6.0g(組成物の総重量に対して0.37質量%)としたが、水の含有量を600g(組成物の総重量に対して37.4質量%)とし、比較例1乃至3に比べて少なくした。この結果、比較例6では組成物の密度は0.743t/m3となり、比較例1乃至3よりも密度が高くなったが、1.0t/m3以上となることはなかった。これに対して、実施例5では、起泡剤の含有量は比較例1乃至3及び6と同じ6.0g(組成物の総重量に対して0.43質量%)としたが、水の含有量は400g(組成物の総重量に対して28.4質量%)とし、比較例6に比べてさらに少なくした。この結果、実施例5では、組成物の密度が1.471t/m3で1.0t/m3以上であった。
比較例8では、起泡剤の含有量を2.0g(組成物の総重量に対して0.13質量%)とし、水の含有量を500g(組成物の総重量に対して33.3質量%)とした。この結果、比較例8の組成物の密度は1.495t/m3で1.0t/m3以上であったが、1.48t/m3を超えた。
さらに、実施例1乃至5のエアミルクのフロー値は135〜250mm程度で、全体として173〜315mm程度の比較例1乃至8のエアミルクのフロー値よりも低かった。
On the other hand, in Comparative Example 6, the content of the foaming agent was 6.0 g (0.37% by mass with respect to the total weight of the composition) as in Comparative Examples 1 to 3, but the water content was 600 g (composition). 37.4% by mass with respect to the total weight of the product) and less than those of Comparative Examples 1 to 3. As a result, the density of the composition in Comparative Example 6 is 0.743t / m 3, and the but density is higher than that of Comparative Examples 1 to 3, never becomes 1.0 t / m 3 or more. On the other hand, in Example 5, the content of the foaming agent was 6.0 g (0.43% by mass with respect to the total weight of the composition) as in Comparative Examples 1 to 3 and 6. The content was 400 g (28.4 mass% with respect to the total weight of the composition), and was further reduced as compared with Comparative Example 6. As a result, in Example 5, the density of the composition was in 1.471t / m 3 1.0t / m 3 or more.
In Comparative Example 8, the content of the foaming agent was 2.0 g (0.13% by mass with respect to the total weight of the composition), and the content of water was 500 g (33.3% with respect to the total weight of the composition). Mass%). As a result, the density of the composition of Comparative Example 8 but was 1.0 t / m 3 or more 1.495t / m 3, exceeds 1.48t / m 3.
Furthermore, the flow value of the air milk of Examples 1 to 5 was about 135 to 250 mm, which was lower than the flow value of the air milk of Comparative Examples 1 to 8 of about 173 to 315 mm as a whole.

以上のことから、起泡剤又は水のいずれかの含有量を減らすことで組成物の密度が高くなることがわかったが、起泡剤の含有量を実施例1の量とし、或いは水の含有量を実施例2乃至5の量とすることで組成物の密度が1.0t/m3以上1.48t/m3以下となり、フロー値も小さくなることがわかった。従って、実施例1乃至5のエアミルクを帯水環境下での施工に用いれば、孔や隙間等の空洞部分に好適に充填することができると考えられる。 From the above, it was found that the density of the composition was increased by reducing the content of either the foaming agent or water, but the content of the foaming agent was the amount of Example 1 or the water the density of the composition by the content and quantity of examples 2 to 5 becomes 1.0 t / m 3 or more 1.48t / m 3 or less, it was found that smaller flow value. Therefore, it is considered that if the air milk of Examples 1 to 5 is used for construction in an aquifer environment, it can be suitably filled in hollow portions such as holes and gaps.

次に、目視による性状観察においては、比較例1、6では泡が消えて減少しており、均一な泡がなかった。さらには、消泡によるセメントミルクの分離が発生していた。また比較例3の性状観察では分離による水溜りが発生していた。これに対して実施例1乃至5のエアミルクではこのような消泡や分離、底部の水溜まりは認められなかった。   Next, in visual property observation, in Comparative Examples 1 and 6, the bubbles disappeared and decreased, and there were no uniform bubbles. Furthermore, separation of cement milk by defoaming occurred. Further, in the property observation of Comparative Example 3, a water pool due to separation occurred. On the other hand, in the air milks of Examples 1 to 5, such defoaming, separation, and bottom water pool were not recognized.

さらに、実施例1のエアミルクは、圧縮強度が材齢1日で150kN/m2を超え、材齢7日で2200kN/m2を超え、材齢28日で3400kN/m2を超えていた。また実施例2乃至5のエアミルクは、圧縮強度が材齢1日で500kN/m2を超え、材齢7日で2200kN/m2を超え、材齢28日で7500kN/m2を超えていた。 Furthermore, Eamiruku of Example 1, the compressive strength of greater than 150 kN / m 2 at 1 day age of greater than 2200kN / m 2 at an age of 7 days, was greater than 3400kN / m 2 at age of 28 days. The Eamiruku Example 2-5, the compressive strength of greater than 500 kN / m 2 at 1 day age of greater than 2200kN / m 2 at an age of 7 days, was greater than 7500kN / m 2 at an age of 28 days .

これに対して、比較例1、6、8のエアミルクは材齢1日、7日、28日のいずれにおいても圧縮強度を測定できなかった。比較例2乃至5のエアミルクでは材齢1日、7日、28日の圧縮強度を測定でき、比較例7のエアミルクでは材齢7日、28日の圧縮強度を測定できたが、いずれも実施例1乃至5のエアミルクに比べて圧縮強度が劣っていた。   In contrast, the air milks of Comparative Examples 1, 6, and 8 were unable to measure the compressive strength at any of the material ages 1 day, 7 days, and 28 days. The air milk of Comparative Examples 2 to 5 was able to measure the compressive strength at 1 day, 7 days and 28 days of age. The air milk of Comparative Example 7 was able to measure the compressive strength of 7 days and 28 days of age. The compressive strength was inferior to the air milk of Examples 1 to 5.

このように実施例1乃至5のエアミルクは、密度が1.0t/m3以上であり、フロー値が各比較例のエアミルクより小さく、且つ、十分に気泡を含み、あるいは、気泡抜けが抑制され、さらに、気泡の均一性が高いことがわかった。また実施例1乃至5のエアミルクは、圧縮強度が各比較例のエアミルクより高いことがわかった。 As described above, the air milk of Examples 1 to 5 has a density of 1.0 t / m 3 or more, the flow value is smaller than the air milk of each comparative example, and contains air bubbles sufficiently, or air bubble omission is suppressed. Furthermore, it was found that the uniformity of bubbles was high. Moreover, it turned out that the air milk of Examples 1 thru | or 5 has higher compressive strength than the air milk of each comparative example.

Claims (6)

セメントと、起泡剤と、水とが含まれ、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上で前記水の組成物の総量に対する含有量が15質量%以上36質量%以下であり、密度が1.0t/m3以上1.48t/m3以下である気泡含有セメント組成物。 Cement, a foaming agent, and water are contained, and the content of the foaming agent with respect to the total amount of the composition is 0.01% by mass or more, and the content with respect to the total amount of the water composition is 15% by mass or more. or less by mass%, a density of 1.0 t / m 3 or more 1.48t / m 3 aerated cement composition or less. セメントと、起泡剤と、水とが含まれ、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上0.06質量%以下で前記水の組成物の総量に対する含有量が15質量%以上であり、密度が1.0t/m3以上1.48t/m3以下である気泡含有セメント組成物。 A cement, a foaming agent, and water are contained, and the content of the foaming agent relative to the total amount of the composition is 0.01% by mass or more and 0.06% by mass or less. There are at least 15 wt%, a density of 1.0 t / m 3 or more 1.48t / m 3 aerated cement composition or less. セメントと、起泡剤と、水とを、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上で前記水の組成物の総量に対する含有量が15質量%以上36質量%以下となるように混合し、密度が1.0t/m3以上1.48t/m3以下となるように調製する気泡含有セメント組成物の製造方法。 Cement, foaming agent, and water are contained in an amount of 0.01% by mass or more with respect to the total amount of the composition of the foaming agent, and a content of 15% by mass or more and 36% by mass with respect to the total amount of the composition of water. It was mixed so that the following method for manufacturing a bubble-containing cement composition is prepared such that the density is 1.0 t / m 3 or more 1.48t / m 3 or less. セメントと、起泡剤と、水とを、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上0.06質量%以下で前記水の組成物の総量に対する含有量が15質量%以上となるように混合し、密度が1.0t/m3以上1.48t/m3以下となるように調製する気泡含有セメント組成物の製造方法。 The content of the cement, the foaming agent, and water with respect to the total amount of the composition of the foaming agent is 0.01% by mass or more and 0.06% by mass or less with respect to the total amount of the water composition. It was mixed so that the mass% or more, a manufacturing method of a bubble-containing cement composition is prepared such that the density is 1.0 t / m 3 or more 1.48t / m 3 or less. セメントと、起泡剤と、水とを、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上で前記水の組成物の総量に対する含有量が15質量%以上36質量%以下となるように混合し、密度が1.0t/m3以上1.48t/m3以下となるように調製することで気泡含有セメント組成物を得て、前記気泡含有セメント組成物を用いて施工を行なう気泡含有セメント組成物を用いた施工方法。 Cement, foaming agent, and water are contained in an amount of 0.01% by mass or more with respect to the total amount of the composition of the foaming agent, and a content of 15% by mass or more and 36% by mass with respect to the total amount of the composition of water. were mixed so that the following density to obtain a bubble-containing cement composition be prepared such that 1.0 t / m 3 or more 1.48t / m 3 or less, by using the bubble-containing cement composition A construction method using a bubble-containing cement composition for construction. セメントと、起泡剤と、水とを、前記起泡剤の組成物の総量に対する含有量が0.01質量%以上0.06質量%以下で前記水の組成物の総量に対する含有量が15質量%以上となるように混合し、密度が1.0t/m3以上1.48t/m3以下となるように調製することで気泡含有セメント組成物を得て、前記気泡含有セメント組成物を用いて施工を行なう気泡含有セメント組成物を用いた施工方法。 The content of the cement, the foaming agent, and water with respect to the total amount of the composition of the foaming agent is 0.01% by mass or more and 0.06% by mass or less with respect to the total amount of the water composition. were mixed so that mass% or more and a density to obtain a bubble-containing cement composition be prepared such that 1.0 t / m 3 or more 1.48t / m 3 or less, the bubble-containing cement composition Construction method using a bubble-containing cement composition that is constructed using
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