JP2011208005A - Lightweight grouting material, and method for grouting lightweight grouting material - Google Patents
Lightweight grouting material, and method for grouting lightweight grouting material Download PDFInfo
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
本発明は、土木構造物の空洞充填、裏込め、軽量盛土および埋立て等に利用できる軽量注入材、及び該軽量注入材を注入する注入工法に関する。 The present invention relates to a lightweight injection material that can be used for filling, backfilling, lightweight embankment and landfilling of civil engineering structures, and an injection method for injecting the lightweight injection material.
従来、土木構造物の空洞充填、裏込め、軽量盛土および埋立て等に用いる軽量注入材としては、エアモルタルやエアミルクなどが知られている。エアモルタルは、セメント、水および砂等の細骨材が混合され、さらに起泡剤が混合されたことによって気泡を含有した状態となったものである。また同様に、エアミルクは、セメントおよび水が混合され、さらに起泡剤が混合されたことによって気泡を含有した状態となったものである。該気泡は、モルタルやミルクの調製の際、すなわちモルタルミキサ等に起泡剤が同時添加されるか、或いは起泡剤や水等を用いて調製された気泡体がモルタルやミルクとは別系統で搬送された後、打設箇所の直前でスタティックミキサにてモルタルやミキサと混合されるようにして用いられている。 Conventionally, air mortar, air milk, and the like are known as lightweight injecting materials used for cavity filling of civil engineering structures, backfilling, lightweight embankment, and landfilling. The air mortar is a state in which bubbles are contained by mixing fine aggregates such as cement, water and sand and further mixing a foaming agent. Similarly, air milk is a state in which bubbles are contained by mixing cement and water and further mixing a foaming agent. When the foam is prepared in a mortar or milk, that is, a foaming agent is added simultaneously to a mortar mixer or the foam prepared using the foaming agent or water is different from the mortar or milk. After being transported, the mortar and mixer are used in a static mixer just before the placement site.
ところで、このエアモルタルやエアミルクを用いた注入工法においては、プラントのトラブルなどの種々の理由によって長時間、注入材の圧送を停止せざるを得ない場合があり、そのような場合には、セメントの水和反応によってミキサーや圧送用のパイプ、ホース内が閉塞してしまうという問題がある。このような閉塞を除去することは極めて煩雑であるうえ、固化したセメントを廃棄したり、洗浄に用いた水の排水処理を行わねばならなくなる、といった問題を生じることにもなる。 By the way, in this injection method using air mortar or air milk, there are cases where the pumping of the injection material must be stopped for a long time due to various reasons such as plant troubles. There is a problem that the mixer, the pipe for feeding, and the inside of the hose are blocked by the hydration reaction. It is extremely complicated to remove such blockages, and also causes a problem that the solidified cement must be discarded or the water used for cleaning must be drained.
斯かる点に鑑み、特許文献１には、セメント１００重量部に対して０．２〜１．０重量部の遅延剤を添加してエアモルタル又はエアミルクを調製するとともに、打設の直前に該遅延剤の２倍〜２０倍重量部の刺激剤を添加するという方法が開示されている。
斯かる方法によれば、遅延剤の添加量が過剰であるためにミキサーやパイプ内でエアモルタル又はエアミルクが硬化することが防止され、良好な流動性を保ったまま施工場所まで運ぶことが可能となるとともに、施工場所では刺激剤の添加によってエアモルタル又はエアミルクを硬化させることができる、という効果が発揮される。
In view of such points, in Patent Document 1, 0.2 to 1.0 parts by weight of a retarder is added to 100 parts by weight of cement to prepare an air mortar or air milk, and immediately before placing, A method of adding 2 to 20 times by weight stimulant of the retarder is disclosed.
According to such a method, since the addition amount of the retarder is excessive, it is possible to prevent the air mortar or air milk from hardening in the mixer and the pipe, and it is possible to carry it to the construction site while maintaining good fluidity. At the same time, the effect that the air mortar or air milk can be cured by the addition of the stimulant at the construction site is exhibited.
しかしながら、上記特許文献１記載の方法では、施工現場に打設したエアモルタルやエアミルクとをすみやかに硬化させる必要があるところ、刺激剤として用いられる消石灰は水への溶解度が小さく、エアモルタルやエアミルクとの均一な混合に時間を要するという問題がある。また、該消石灰は、カルシウムイオンが主成分となっているため、硬度が高く、気泡の安定性に悪影響を及ぼすおそれがある。
また、刺激剤となりうる水酸化ナトリウムは劇物であるため、実際の打設現場にて使用することは難しいという問題がある。
However, in the method described in Patent Document 1, it is necessary to quickly cure the air mortar and air milk placed on the construction site. However, slaked lime used as a stimulant has low solubility in water, and air mortar and air milk. There is a problem that it takes time to uniformly mix with. Further, since the slaked lime is mainly composed of calcium ions, the slaked lime has high hardness and may adversely affect the stability of bubbles.
Moreover, since sodium hydroxide that can be a stimulant is a deleterious substance, there is a problem that it is difficult to use it at an actual setting site.
また、特許文献２には、二種類の材料を別々に圧送し、注入直前に両者を混ぜ合わせた後に注入するという、いわゆる二液性の注入材であって、気泡と潜在水硬性材料とを含むＡ液と、該潜在水硬性材料を硬化させるための刺激剤を含むＢ液とから構成されたものが開示されている。即ち、該特許文献２に記載の注入材によれば、潜在水硬性材料は刺激剤と混合されて始めて水と反応して硬化するため、工事現場における諸事情により注入材の圧送を長期間停止した場合であっても、刺激剤と混合されていないミキサーやパイプ内では該注入材（Ａ液）が硬化することが防止されるという効果が発揮される。 Patent Document 2 discloses a so-called two-component injection material in which two kinds of materials are separately pumped and mixed together immediately before injection, in which bubbles and latent hydraulic material are mixed. What is comprised from the A liquid containing and the B liquid containing the irritation | stimulation agent for hardening this latent hydraulic material is disclosed. That is, according to the injection material described in Patent Document 2, since the latent hydraulic material is only mixed with the stimulant and reacts with water to be cured, the pumping of the injection material is stopped for a long time due to various circumstances at the construction site Even in this case, the effect of preventing the injection material (liquid A) from being hardened is exhibited in a mixer or pipe not mixed with the stimulant.
しかしながら、上記特許文献２記載の方法によれば、注入材の圧送を長時間中断した際の注入材の硬化による問題は解消されたが、該注入材に含まれる気泡の状態が安定して維持されないことがあり、注入された軽量注入材の単位容積質量が、設計された単位容積質量から大きく逸脱する場合があった。また、単位容積質量が大幅に変動するような際には、パイプ内に残存する注入材を廃棄せざるを得ない場合もあった。 However, according to the method described in Patent Document 2, the problem due to the hardening of the injection material when the pumping of the injection material is interrupted for a long time has been solved, but the state of the bubbles contained in the injection material is stably maintained. In some cases, the unit volume mass of the injected lightweight injection material may deviate significantly from the designed unit volume mass. In addition, when the unit volume mass fluctuates greatly, the injection material remaining in the pipe may have to be discarded.
本発明は、上記のような従来技術の問題点に鑑みてなされたものであり、ポンプ等による長距離圧送性に優れた流動性を長時間にわたって維持することができ、また、注入材の圧送を長時間停止せざるを得ない場合でもミキサーやパイプ内での閉塞を防止することができ、しかも、気泡を安定した状態に保って軽量注入材の単位容積質量が変動することを抑制しうるような軽量注入材、および該軽量注入材を用いた注入工法を提供することを目的とする。 The present invention has been made in view of the above-described problems of the prior art, and can maintain fluidity excellent in long-distance pumpability by a pump or the like over a long period of time. Can be prevented from clogging in the mixer or pipe even if it must be stopped for a long time, and it is possible to suppress fluctuations in the unit volume mass of the lightweight injection material while keeping the bubbles stable. An object of the present invention is to provide such a lightweight injection material and an injection method using the lightweight injection material.
上記のような課題に鑑み、本発明に係る軽量注入材は、別々に圧送され、注入前に混合される二種類の材料から構成された軽量注入材であって、該二種類の材料が、潜在水硬性材料および水を含有するＡ液と、該潜在水硬性材料に水硬性を生じさせるための刺激剤および気泡を含有するＢ液とから構成され、該Ｂ液は、水１００重量部に対してアルカリ剤を１０〜３０重量％含むことを特徴とする。 In view of the above problems, the lightweight injection material according to the present invention is a lightweight injection material composed of two types of materials that are separately pumped and mixed before injection, and the two types of materials are: A liquid A containing a latent hydraulic material and water, and a B liquid containing a stimulant and bubbles for generating hydraulic properties in the latent hydraulic material, and the B liquid is contained in 100 parts by weight of water. On the other hand, it contains 10 to 30% by weight of an alkali agent.
また、本発明に係る軽量注入材の注入工法は、二種類の材料を別々に圧送し、混合した後に注入する軽量注入材の注入工法であって、該二種類の材料として、潜在水硬性材料および水を含有するＡ液と、該潜在水硬性材料に水硬性を生じさせるための刺激剤および気泡を含有するＢ液とを用い、該Ｂ液として、水１００重量部に対してアルカリ剤を１０〜３０重量％含むものを用いることを特徴とする。 The injection method of the lightweight injection material according to the present invention is a lightweight injection material injection method in which two types of materials are separately pumped and mixed and then injected, and the two types of materials are latent hydraulic materials. And a liquid A containing water, a stimulating agent for generating hydraulic properties in the latent hydraulic material and a liquid B containing bubbles, and as the liquid B, an alkaline agent is added to 100 parts by weight of water. What contains 10 to 30 weight% is used, It is characterized by the above-mentioned.
本発明に係る軽量注入材及び軽量注入材の注入工法によれば、潜在水硬性材料および水を含有するＡ液と、該潜在水硬性材料に水硬性を生じさせるための刺激剤および気泡を含有するＢ液とから構成された二種類の材料を用いることにより、該Ａ液とＢ液とを混合する前には硬化を防止することができる。 According to the lightweight injection material and the injection method of the lightweight injection material according to the present invention, the liquid A containing the latent hydraulic material and water, and the stimulant and the bubbles for generating hydraulic properties in the latent hydraulic material are contained. By using two types of materials composed of the liquid B to be cured, curing can be prevented before the liquid A and the liquid B are mixed.
また、本発明では、気泡を、潜在水硬性材料を含むＡ液側に混合するのではなく、刺激剤と所定量のアルカリ剤とを含むＢ液側に混合するようにしたことにより、単位容積質量の変動が抑制された軽量注入材、および該軽量注入材の注入工法を提供することが可能となる。 Further, in the present invention, the bubbles are not mixed on the side of the liquid A containing the latent hydraulic material, but on the side of the liquid B containing the stimulant and a predetermined amount of the alkali agent, so that the unit volume is obtained. It is possible to provide a light weight injection material in which fluctuations in mass are suppressed and an injection method for the light weight injection material.
本発明に係る軽量注入材は、硬化成分である潜在水硬性材料を含むＡ液と、該潜在水硬性材料を硬化させるための刺激剤および気泡を含むＢ液とが別々に調製され、注入場所まで別々のパイプ等で圧送され、注入直前において該Ａ液とＢ液とが混合された後、注入箇所へ注入するようにして用いられる、いわゆる二液性の注入材である。また、本発明に係る軽量注入材は、気泡が含まれていることによって注入部位から周辺への逸脱が防止されるとともに、該気泡を含んだ状態で固化することによって強度と軽量性とを併せもつ、いわゆる軽量注入材である。 In the lightweight injection material according to the present invention, the liquid A containing the latent hydraulic material which is a curing component and the liquid B containing the stimulant and the bubbles for curing the latent hydraulic material are separately prepared, and the injection site This is a so-called two-component injection material that is used by being pumped through separate pipes, etc., and mixed into the injection site after the A liquid and B liquid are mixed immediately before injection. Further, the lightweight injecting material according to the present invention prevents the deviation from the injection site to the periphery by including bubbles, and combines strength and light weight by solidifying in a state including the bubbles. It is a so-called lightweight injection material.
該Ａ液は、硬化材である潜在水硬性材料と水とを含み、さらに、任意成分として、砂等の骨材や、分離防止剤等を含むものである。 The liquid A contains a latent hydraulic material that is a hardening material and water, and further contains an aggregate such as sand, an antiseparation agent, and the like as optional components.
潜在水硬性材料としては、高炉スラグなどのスラグ粉末や、ポゾラン粉末から選ばれた１種以上からなるものを用いることができる。ポゾラン粉末は、天然ポゾランとして、火山灰、ケイ酸白土、珪藻土、ベントナイト、カオリン等の粘土類、並びに人工ポゾランとして、か焼カオリンなどのか熱粘土類、フライアッシュ（石灰灰）、シリカフューム等から選ぶことができる。
スラグ粉末およびポゾラン粉末は、それ自体は水硬性を有しないが、水の存在下において刺激剤を加えることで水硬性を発揮して硬化するものである。
As the latent hydraulic material, it is possible to use slag powder such as blast furnace slag or one made of pozzolanic powder. The pozzolan powder should be selected from natural pozzolans such as volcanic ash, silicate clay, diatomaceous earth, bentonite and kaolin, and as artificial pozzolans, calcined kaolin and other hot clays, fly ash, silica fume, etc. Can do.
The slag powder and pozzolanic powder do not have hydraulic properties per se, but are cured by exerting hydraulic properties by adding a stimulant in the presence of water.
骨材としては、粒径２．５ｍｍ以下の天然砂や砕砂等を好適に用いることができ、潜在水硬性材料１００重量部に対して０〜３００重量部の範囲で配合することが好ましく、同じく０〜２００重量部の範囲で配合することがより好ましい。 As the aggregate, natural sand or crushed sand having a particle size of 2.5 mm or less can be suitably used, and it is preferably blended in the range of 0 to 300 parts by weight with respect to 100 parts by weight of the latent hydraulic material. It is more preferable to mix in the range of 0 to 200 parts by weight.
分離防止剤としては、ベントナイト、モンモリロナイト、バイデライト、へクトライト、サポナイト、スチブンサイト、ソーコナイト、ノントロナイト等のスメクタイト系粘土、バーミキュライト、ハロイサイト、膨潤性マイカなどの天然粘土、及び合成粘土、並びにこれらの混合物からなる群より選択される１種又は２種以上を用いることができる。該分離防止剤を添加することにより、材料分離やブリーディングを抑制し且つ気泡の安定化を図ることができる。 Anti-separation agents include bentonite, montmorillonite, beidellite, hectorite, saponite, stevensite, soconite, nontronite, and other natural clays such as vermiculite, halloysite, and swelling mica, and synthetic clay, and mixtures thereof. 1 type (s) or 2 or more types selected from the group which consists of can be used. By adding the separation inhibitor, it is possible to suppress material separation and bleeding and to stabilize the bubbles.
該分離防止剤の配合量については、特に限定されるものではないが、材料分離を抑制して気泡の安定性を図るという観点から、潜在水硬性材料１００重量部に対して０〜５重量部とすることが好ましく、０〜３重量部とすることがより好ましい。 The blending amount of the anti-separation agent is not particularly limited, but it is 0 to 5 parts by weight with respect to 100 parts by weight of the latent hydraulic material from the viewpoint of suppressing material separation and improving the stability of bubbles. It is preferable to set it as 0 to 3 parts by weight.
一方、Ｂ液は、前記潜在水硬性材料を硬化させる刺激剤と、気泡とを含むものである。
潜在水硬性材料が高炉スラグである場合には、該刺激剤として、水酸化ナトリウム、硫酸ナトリウム等の電解質物質、セメント、石灰等からなる群より選ばれた１種以上を用いることができる。また、潜在水硬性材料がポゾラン粉末である場合には、該刺激剤として、水酸化カルシウムを用いることができる。
On the other hand, the B liquid contains a stimulant that cures the latent hydraulic material and bubbles.
When the latent hydraulic material is blast furnace slag, one or more selected from the group consisting of electrolyte substances such as sodium hydroxide and sodium sulfate, cement, lime and the like can be used as the stimulant. Further, when the latent hydraulic material is a pozzolanic powder, calcium hydroxide can be used as the stimulant.
また、これらの刺激剤に加え、該Ｂ液には、炭酸ナトリウム、炭酸カリウム等のアルカリ成分を添加しておくことが好ましく、該アルカリ成分を添加することにより、該Ｂ液において気泡を生成させる際、硬度の高い水でも気泡を安定化させうるという効果がある。 In addition to these stimulants, it is preferable to add an alkali component such as sodium carbonate or potassium carbonate to the solution B. By adding the alkali component, bubbles are generated in the solution B. In this case, there is an effect that bubbles can be stabilized even with water having high hardness.
気泡を生成させる成分としては、界面活性剤系、タンパク質系、又は樹脂石鹸系等の各種起泡剤や、金属粉末や過酸化物等の発泡剤を用いることができ、該気泡に含まれる気体（ガス成分）については特に限定されるものではない。 As the component for generating bubbles, various foaming agents such as surfactants, proteins, or resin soaps, and foaming agents such as metal powders and peroxides can be used, and the gas contained in the bubbles The (gas component) is not particularly limited.
該気泡の含有割合については特に限定されるものではないが、骨材を含まない場合、Ａ液とＢ液とが混合された軽量注入材の単位容積質量が０．５〜０．８ｇ／ｃｍ3となるように調整されることが好ましく、０．６〜０．７ｇ／ｃｍ3となるように調整されることがより好ましい。
また、該気泡の含有割合は、骨材を含む場合、Ａ液とＢ液とが混合された軽量注入材の単位容積質量が０．８〜１．１ｇ／ｃｍ3となるように調整されることが好ましく、０．９〜１．０ｇ／ｃｍ3となるように調整されることがより好ましい。
気泡の含有割合が上記のような範囲である場合には、強度と軽量性とを兼ね備えた軽量注入材になるという効果がある。
The content ratio of the bubbles is not particularly limited, but when aggregate is not included, the unit volume mass of the lightweight injection material in which the liquid A and the liquid B are mixed is 0.5 to 0.8 g / cm. 3 it is preferred to be adjusted so that, it is more preferably adjusted such that the 0.6~0.7g / cm 3.
Moreover, the content rate of this bubble is adjusted so that the unit volume mass of the lightweight injection material by which A liquid and B liquid were mixed will be 0.8-1.1 g / cm < 3 >, when an aggregate is included. It is preferable that the thickness is adjusted to be 0.9 to 1.0 g / cm 3 .
When the content ratio of the bubbles is in the above range, there is an effect that a light weight injection material having both strength and light weight is obtained.
また、該Ｂ液には、炭酸ナトリウムや炭酸カリウムなどのアルカリ炭酸塩、炭酸水素ナトリウム、炭酸水素カリウムなどに例示されるアルカリ剤を添加する。これらのアルカリ剤をＢ液に添加しておくことにより、硬度の高い水を用いた際にも気泡の安定化を図ることが可能となる。 Moreover, the alkaline agent illustrated by alkali carbonates, such as sodium carbonate and potassium carbonate, sodium hydrogencarbonate, potassium hydrogencarbonate, etc. is added to this B liquid. By adding these alkaline agents to the liquid B, it is possible to stabilize the bubbles even when water having high hardness is used.
該アルカリ剤の添加量は、該Ｂ液を構成する水、即ち、刺激剤を希釈すべく用いられる希釈水に対して、１０〜３０重量％とし、好ましくは１０〜２０重量％とする。 The addition amount of the alkaline agent is 10 to 30% by weight, preferably 10 to 20% by weight, based on the water constituting the liquid B, that is, the dilution water used for diluting the stimulant.
次に、図１に示した工程図を参照しつつ、本発明に係る軽量注入材の一実施形態の注入工法について説明する。図１に示すように、先ず、Ａ液およびＢ液を、上記のような配合に基づいてそれぞれ調製する。具体的には、Ａ液については、セメントミキサ等の撹拌器を用いて潜在水硬性材料および必要に応じて添加する骨材を混合した後、さらに、水および必要に応じて添加する分離防止剤を混合し、流動性の良好なＡ液を調製する。 Next, an injection method according to an embodiment of the lightweight injection material according to the present invention will be described with reference to the process chart shown in FIG. As shown in FIG. 1, first, A liquid and B liquid are each prepared based on the above mixing | blending. Specifically, for the liquid A, after mixing a latent hydraulic material and an aggregate to be added as necessary using a stirrer such as a cement mixer, water and an antiseparation agent to be added as necessary To prepare a liquid A having good fluidity.
一方、Ｂ液については、刺激剤を水に溶解させて刺激剤希釈液を調製し、該刺激剤希釈液にアルカリ剤を添加混合する。さらに、起泡剤を添加混合した後、得られた混合材料を発泡ガンに通すことによって発泡させ、液中に細かい気泡を生じさせることによってシェービングクリームのようなクリーム状のＢ液を調製する。 On the other hand, for solution B, a stimulant is dissolved in water to prepare a stimulant diluted solution, and an alkaline agent is added to and mixed with the stimulant diluted solution. Further, after adding and mixing the foaming agent, the obtained mixed material is foamed by passing through a foaming gun, and fine bubbles are generated in the liquid to prepare a creamy B liquid such as a shaving cream.
このようにして調製したＡ液およびＢ液を、それぞれ別々のパイプによって圧送し、注入場所まで送る。該注入場所には該Ａ液とＢ液とを混合するための混合機を設置しておき、圧送されたＡ液およびＢ液を該混合機へと供給し、両者を混合することで所定の配合および単位容積質量の軽量注入材を調製する。このようにして調製された軽量注入材は、所定の注入箇所へと注入することができる。 The liquid A and liquid B prepared in this way are pumped by separate pipes and sent to the injection site. A mixer for mixing the A liquid and the B liquid is installed at the injection location, and the A liquid and the B liquid that are fed under pressure are supplied to the mixer and mixed together to obtain a predetermined Prepare a light weight infusion of formulation and unit volume mass. The lightweight injection material prepared in this way can be injected into a predetermined injection site.
本発明に係る軽量注入材によれば、Ａ液及びＢ液を上記のような配合として圧送することにより、例えば長時間にわたって該Ａ液及びＢ液の圧送を中断したような場合であっても圧送中のＡ液およびＢ液の単位容積質量が維持されやすいという効果がある。つまり、本発明によれば、工事を長時間にわたって中断した後、再び圧送を開始した場合であっても、注入される軽量注入材の単位容積質量が設計値から大幅に逸脱することを防止しうるという効果がある。 According to the lightweight injecting material according to the present invention, even if the pumping of the liquid A and the liquid B is interrupted for a long time by pumping the liquid A and the liquid B as the above composition, for example. There is an effect that the unit volume masses of the liquid A and the liquid B being pumped are easily maintained. That is, according to the present invention, even if the construction is interrupted for a long time and then pumping is started again, the unit volume mass of the light injecting material to be injected is prevented from greatly deviating from the design value. There is an effect of urging.
単位容積質量の評価
（Ａ液およびＢ液の調製）
下記表１および表２に示す配合に基づき、軽量注入材を構成するＡ液およびＢ液をそれぞれ作製した。尚、骨材を含有する軽量注入材の設計単位容積質量は０．６４２ｇ／ｃｍ3であり、骨材を含有しない軽量注入材の設計単位容積質量は０．９２２ｇ／ｃｍ3である。また、使用した材料は以下の通りである。
・潜在水硬性材料 ：高炉水砕スラグ（住金鉱化社製、商品名「スミットメント（石膏未添加品）」、ブレーン比表面積４０００ｃｍ2／ｇ）
・骨材 ：乾燥硅砂４号
・水 ：上水道水
・分離防止剤 ：ベントナイト（ホウジュン社製、商品名「スーパークレイ」）
・起泡剤 ：界面活性剤系起泡剤（住友大阪セメント社製、商品名「スミシールドＡＳ−１」）
・刺激剤 ：硫酸ナトリウム（試薬）
・アルカリ剤 ：炭酸ナトリウム（試薬）
Evaluation of unit volume mass (Preparation of liquid A and liquid B)
Based on the formulation shown in Table 1 and Table 2 below, A liquid and B liquid constituting the light weight injection material were prepared. In addition, the design unit volume mass of the lightweight injection material containing an aggregate is 0.642 g / cm < 3 >, and the design unit volume mass of the lightweight injection material which does not contain an aggregate is 0.922 g / cm < 3 >. The materials used are as follows.
・ Hydraulic hydraulic material: Blast furnace granulated slag (manufactured by Sumikin Mineral Co., Ltd., trade name “Smitment”), Blaine specific surface area 4000 cm 2 / g)
・ Aggregate: Dried cinnabar No.4 ・ Water: Tap water ・ Separation inhibitor: Bentonite (product name “Super Clay” manufactured by Hojun Co., Ltd.)
-Foaming agent: Surfactant-based foaming agent (manufactured by Sumitomo Osaka Cement Co., Ltd., trade name "Sumishield AS-1")
・ Stimulant: Sodium sulfate (reagent)
・ Alkaline agent: Sodium carbonate (reagent)
調製した実施例及び比較例のＡ液およびＢ液について、これらを調製した直後、および、調製してから１日経過後に、単位容積質量を測定した。また、Ａ液およびＢ液を調製した直後に混合した軽量注入材、およびＡ液およびＢ液を調製して１日経過後に混合した軽量注入材についても、単位容積質量を測定した。結果を表３に示す。 About the prepared A liquid and B liquid of the Example and the comparative example, the unit volume mass was measured immediately after preparing these, and 1 day after preparation. In addition, the unit volume mass was also measured for the lightweight injecting material mixed immediately after preparing the A liquid and the B liquid, and the light injecting material prepared by mixing the A liquid and the B liquid after one day. The results are shown in Table 3.
表３より明らかなように、比較例１及び２の注入材ではＡ液の単位容積質量が、液の調製から１日経過することによって大きく変動しているのに対し、本発明に係る実施例１及び２の注入材ではＡ液の単位容積質量が液の調製から１日経過しても殆ど変化していないことが認められる。このことから、本発明によれば、注入材の圧送を長時間中断したような場合であっても、設計どおりの単位容積質量を有する軽量注入材を注入し得ることがわかる。 As is apparent from Table 3, in the injection materials of Comparative Examples 1 and 2, the unit volume mass of the liquid A greatly fluctuates with the passage of one day from the preparation of the liquid, whereas the examples according to the present invention. In the injection materials 1 and 2, it can be seen that the unit volume mass of the liquid A hardly changes even after 1 day from the preparation of the liquid. From this, it can be seen that according to the present invention, even when the pumping of the injection material is interrupted for a long time, a lightweight injection material having a unit volume mass as designed can be injected.
刺激剤およびアルカリ剤の評価
（Ａ液およびＢ液の調製）
Ｂ１、Ｂ２の配合のＢ液に代えて、下記表４に示すＢ５〜Ｂ１４の配合のものを用いたことを除き、他は実施例１又は実施例２と同様にしてＡ液およびＢ液をそれぞれ作製した。
作製したＡ液およびＢ液を一日放置した後これらを混合して軽量注入材を作製し、その単位容積質量を測定するとともに、該軽量注入材を打設して強度試験用の供試体を作製し、１日、７日および２８日経過後の圧縮強度を測定した。結果を下記表５に示す。
尚、新たに使用した材料を以下に示す。
・刺激剤 ：水酸化カルシウム（試薬）
・アルカリ剤 ：炭酸カリウム（試薬）
Evaluation of stimulants and alkaline agents (preparation of solution A and solution B)
The liquid A and liquid B were the same as in Example 1 or Example 2, except that the liquids B5 and B14 shown in Table 4 below were used instead of the liquid B mixed with B1 and B2. Each was produced.
The prepared liquid A and liquid B were allowed to stand for a day and then mixed to prepare a lightweight injection material. The unit volume mass was measured, and the lightweight injection material was placed to prepare a specimen for strength test. The compressive strength was measured after 1 day, 7 days and 28 days. The results are shown in Table 5 below.
The newly used materials are shown below.
・ Stimulant: Calcium hydroxide (reagent)
・ Alkaline agent: Potassium carbonate (reagent)
表５に示した結果によれば、Ｂ１０〜Ｂ１３の配合のＢ液を使用した比較例３〜６および比較例８〜比較例１０の軽量注入材では、注入材の単位容積質量が設計値である０．６４２ｇ／ｃｍ3（骨材なし）や０．９２２ｇ／ｃｍ3（骨材あり）よりも大幅に増大しており、気泡が安定して保持されなかったことが認められる。
また、Ｂ１４の配合のＢ液を使用した比較例７及び比較例１２の軽量注入材では、注入材の単位容積質量がほぼ設計値どおりとなっており、刺激剤を含まない場合には潜在水硬性材料が硬化しないものの、気泡の安定性に悪影響を及ぼさないことが認められる。
According to the results shown in Table 5, in the light weight injecting materials of Comparative Examples 3 to 6 and Comparative Examples 8 to 10 using the B liquid having the composition of B10 to B13, the unit volume mass of the injecting material is the design value. This is significantly higher than some 0.642 g / cm 3 (without aggregate) and 0.922 g / cm 3 (with aggregate), and it is recognized that the bubbles were not stably held.
Moreover, in the lightweight injection material of the comparative example 7 and the comparative example 12 which used B liquid of the mixing | blending of B14, the unit volume mass of an injection material is as the design value, and when a stimulant is not included, it is a latent water. It can be seen that the hard material does not cure but does not adversely affect the stability of the bubbles.
これに対し、Ｂ５〜Ｂ９の配合のＢ液を使用した実施例３〜７および実施例８〜１２の軽量注入材では、２８日経過後の圧縮強度が１．０［N/mm2］以上となるような比較的良好な強度発現性を有しつつ、しかも、１日放置した後にＡ液とＢ液とを混合した軽量注入材の単位容積質量が、設計値である０．６４２ｇ／ｃｍ3（骨材なし）や０．９２２ｇ／ｃｍ3（骨材あり）から大幅に逸脱しておらず、刺激剤を含んでいても気泡が安定して保持されたことが認められる。 On the other hand, in the lightweight injection materials of Examples 3 to 7 and Examples 8 to 12 using the B liquid having the composition of B5 to B9, the compressive strength after 28 days is 1.0 [N / mm 2 ] or more. In addition, the unit volume mass of the lightweight injection material in which the liquid A and the liquid B are mixed after being allowed to stand for 1 day is 0.642 g / cm 3 , which is a design value. It does not deviate significantly from (no aggregate) or 0.922 g / cm 3 (with aggregate), and it is recognized that the bubbles were stably held even if the stimulant was included.
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