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JP3674559B2 - Injection method of plastic injection material - Google Patents
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JP3674559B2 - Injection method of plastic injection material - Google Patents

Injection method of plastic injection material Download PDF

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Publication number
JP3674559B2
JP3674559B2 JP2001273551A JP2001273551A JP3674559B2 JP 3674559 B2 JP3674559 B2 JP 3674559B2 JP 2001273551 A JP2001273551 A JP 2001273551A JP 2001273551 A JP2001273551 A JP 2001273551A JP 3674559 B2 JP3674559 B2 JP 3674559B2
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Prior art keywords
injection material
water
weight
amount
cement
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JP2003082653A (en
Inventor
安志 面高
正博 ▼吉▲原
秀夫 高橋
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Sumitomo Osaka Cement Co Ltd
Estech Corp
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Sumitomo Osaka Cement Co Ltd
Estech Corp
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/40Surface-active agents, dispersants
    • C04B2103/408Dispersants
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/70Grouts, e.g. injection mixtures for cables for prestressed concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、土木構造物の空洞充填、軽量盛土、埋立等に利用できる可塑性注入材の注入方法に関する。
【0002】
【従来の技術】
空洞充填部に地下水や流水がある場合、注入材が地下水や流水に希釈されることを防止するために、注入材にゲル状の凝集体としての性状が求められることがある。また、充填部を限定的に区間注入する場合、通常のセメントミルク系注入材では周辺への逸脱問題が発生し、限定注入できない等の問題があり、この様な場合にも注入材にゲル状の凝集体としての性状が求められる。この様に、ゲル化した凝集体の状態となり、地下水や流水に希釈されることなく、その形状付与性により、周囲への逸脱が生じ難い性状を、本願明細書では「可塑性」と称する。
【0003】
上記した様な理由により、従来、セメントミルク、セメントエアミルク等の注入では、セメントミルク等に水ガラス系薬液又はアルミニウム塩類を添加して、注入材に可塑性を付与する技術が用いられている。しかしながら、これらの注入材は、耐久性が劣り、地下水の汚染の問題があり、価格等の点でも十分に満足のいくものではない。
【0004】
一方、化学的に安定で耐久性に優れ、しかも安価で容易に入手できる材料を用いた瞬時に可塑性体となる材料として、セメントミルクと、ベントナイトを水に懸濁させたベントナイトミルクからなる可塑化液とを混合撹拌して得られる注入材が報告されている(特開平11−310779号公報)。
【0005】
また、可塑化液として、ベントナイトに代えてメタカオリンやアタパルジャイトを使用した注入材も報告されている(特開2001−48629号公報)。
【0006】
この様なセメントミルクと可塑化液とからなる注入材において、ベントナイト等の可塑材をダマになることなく可塑化液中で均一に分散させるためには、通常、可塑材に対して水を4重量倍程度以上用いることが必要とされており、一般的には、可塑材:水=1:6.2〜7.1程度の割合の可塑化液が用いられている。
【0007】
しかしながら、これらの可塑化液は水を大量に含むものであり、混練、圧送、運搬等に手間がかかるという問題がある。また、可塑化性能を十分に発揮するために必要な量の可塑材を注入材に含ませようとすると、必然的に可塑化液の割合が多くなり、注入材の単位体積当たりのセメント量が制限されて高強度化が困難になる。また、セメントミルクに気泡を混入させて軽量化しようとしても、やはり注入材の単位体積当たりの気泡量が限定されて十分に軽量化できないという問題点がある。
【0008】
【発明が解決しようとする課題】
本発明の主な目的は、セメントミルクと可塑化液とを混練してなる可塑性注入材の注入方法であって、可塑材の分散性を阻害することなく可塑化液における水の添加量を低減することを可能として、可塑化液の調製、運搬等を容易とし、更に、高強度化、軽量化等の目的に応じた様々な配合組成とすることができる可塑性注入材の新規な注入方法を提供することである。
【0009】
【課題を解決するための手段】
本発明者は、上記した目的を達成すべく鋭意研究を重ねた結果、可塑化液に配合する可塑材としてアタパルジャイトを選択し、更に、アタパルジャイト100重量部に対して1.2〜4重量部という特定量のリン酸塩系分散剤を添加する場合には、従来の可塑化液と比べて水の添加量を減少させた場合であっても、可塑材がダマになることなく均一に分散した懸濁液を得ることができ、上記した目的を達成し得る可塑性注入材の注入方法となることを見出し、ここに本発明を完成するに至った。
【0010】
即ち、本発明は、下記の可塑性注入材を提供するものである。
1. アタパルジャイト100重量部、リン酸塩系分散剤1.2〜4重量部及び水170〜500重量部を含む可塑化液と、セメントミルクとを撹拌混合して可塑性注入材を作製し、該注入材を施工場所に注入することを特徴とする可塑性注入材の注入方法。
2. 前記可塑化液を更に水で希釈した後、これをセメントミルクと撹拌混合することを特徴とする上記項1に記載の可塑性注入材の注入方法。
3. 工場で製造され、施工現場に搬送されたアタパルジャイト100重量部、リン酸塩系分散剤1.2〜4重量部及び水170〜500重量部を含む可塑化液を、そのまま又は水で希釈した後、セメントミルクと撹拌混合して可塑性注入材を作製し、該注入材を施工場所に注入することを特徴とする可塑性注入材の注入方法。
【0011】
【発明の実施の形態】
本発明の注入方法で用いる可塑性注入材とは、可塑材を含む可塑化液とセメントミルクとを混合して、瞬時に可塑化させて注入材として用いるものである。
【0012】
本発明では、該注入材における可塑化液に配合する可塑材として、アタパルジャイトを用いることが必要である。アタパルジャイトの品位については特に限定はないが、80メッシュふるい全通となる粒径以下の粉体が好ましい。
【0013】
可塑化液には、アタパルジャイト100重量部に対してリン酸塩系分散剤を1.2〜4重量部程度添加することが必要である。
【0014】
アタパルジャイトに対して上記した特定量のリン酸塩系分散剤を添加することによって、従来の可塑化液と比べて水の添加量が少ない場合であっても、ダマが生じることなく、均一な懸濁液とすることができ、水の添加量をアタパルジャイト100重量部に対して200重量部程度という少量とすることが可能となる。水の添加量の上限値については特に限定はなく、アタパルジャイトの分離が生じない範囲内で使用目的に応じて適宜設定することが可能であるが、様々な配合設計を可能とするためには、可塑化液中の水の添加量をできるだけ少なくすることが適切であり、通常、アタパルジャイト100重量部に対して170〜500重量部程度、好ましくは170〜400重量部程度、より好ましくは170〜300重量部程度の水の添加量とする。
【0015】
また、この可塑化液は、フロー値200m程度の圧送に適した適度な流動性を有するものとすることができ、また、セメントミルクと混合した場合に従来と同様の可塑性状となる。
【0016】
可塑化液に配合するリン酸塩系分散剤としては、ピロリン酸カリウム、ピロリン酸ナトリウム、トリポリリン酸ナトリウム、テトラポリリン酸ナトリウム等を用いることができる。
【0017】
セメントミルクは、セメント及び水を主成分とするミルク状態の懸濁液であり、セメントとしては、普通、早強、超早強、白色、耐硫酸塩、中庸熱、低熱等の各種ポルトランドセメント、前記ポルトランドセメントの少なくとも一種と高炉スラグ、フライアッシュなどの少なくとも一種とを混合した混合セメント、ジェットセメント、アルミナセメントなどの特殊セメント、セメント系固化材等から選ぶことができる。
【0018】
セメントミルクは、必要に応じて起泡剤を発泡処理した気泡を混合してセメントエアミルクとしても良い。また、セメントミルクに砂、レキ、発泡ビーズ等を添加することにより可塑性注入材の比重を調整してもよい。
【0019】
更に、セメントミルクには、必要に応じて減水剤、遅延剤、分散剤等の混和剤を添加してもよく、これらの混和剤を添加した場合にも、練り上がり後の可塑性にはほとんど影響はない。減水剤の添加によりセメントミルク中の単位水量を減らしたり、単位セメント量を増加することができ、高強度化及び軽量化の配合設計の範囲が拡大される。遅延剤の添加により輸送配管等設備内部での硬化を防止して設備の洗浄を軽減することができる。分散剤の添加により流動性が向上し、配管等による輸送距離を延ばすことができる。
【0020】
セメントミルクにおける水の添加量は、均質なセメントミルクの調製可能な範囲であれば良く、通常、セメント:水(重量比)=1:0.3〜1:1程度の範囲とすればよい。
【0021】
本発明では、上記の様に予め調製した可塑化液とセメントミルクをそれぞれ懸濁状態として、これらを瞬時に混合する。
【0022】
注入材における可塑化液とセメントミルクの混合割合は特に限定的ではなく、使用目的に応じて適宜決定すればよいが、注入材中のアタパルジャイト量が少な過ぎると十分な可塑性能を発揮できず、一方、アタパルジャイト量が多すぎると注入時の抵抗が強くなり、コストも高くなる。このため、通常、注入材中におけるアタパルジャイト量が30〜130kg/m3程度の範囲となるように混合することが好ましい。
【0023】
該セメントミルクは、セメントから遊離したカルシウムイオンで過飽和状態であり、プラス荷電のカルシウムイオンで満たされている。
【0024】
一方、可塑化液は、アタパルジャイトが膨潤し、マイナスイオンに帯電している。
【0025】
この様な可塑化液とセメントミルクとをそれぞれ懸濁液状態として撹拌混合することによって、アタパルジャイト表面のマイナス荷電がカルシウムプラスイオンで中和され、アタパルジャイト粒子の分子間力に基づく急激な凝集作用により、混合物が瞬時に可塑化し、水中で分離することのない優れた可塑性注入材が得られる。
【0026】
この様に瞬間的に均一に可塑化するためには、懸濁液同士の混合が必須であり、アタパルジャイト懸濁液にセメント粉体を直接混合する方法では、カルシウムイオンの溶解に時間がかかるため、瞬時に可塑化させることは難しい。
【0027】
本発明では、アタパルジャイトに対して上記した特定量のリン酸塩系分散剤を添加することによって、アタパルジャイト:水(重量比)=1:2程度という、従来の可塑化液と比べて非常に少ない水の添加量であっても均一で安定な可塑化液とすることができる。注入材中では、目的に応じた適度な可塑性能を発揮するために必要な量の可塑材(アタパルジャイト)が配合されるが、上記した水の添加量の少ない可塑化液を用いることによって、注入材の単位体積当たりのセメントミルクの使用量を従来の注入材と比べて増加することができ、単位体積当たりのセメント量の多い高強度の硬化体を得ることが可能となる。また、気泡を含むセメントミルク(セメントエアミルク)を用いる場合にも、注入材の単位体積当たりの気泡量を従来より増加することが出来、硬化体の軽量化も可能となる。勿論、可塑化液における水量を従来と同程度とすれば、従来と同様の配合組成とすることも可能である。
【0028】
尚、気泡の混入量は、可塑性注入材量の75容積%程度以下とすることが好ましい。気泡量が多すぎると、強度や可塑性が低下し易いので不適切である。
【0029】
この様に、本発明によれば、アタパルジャイトに対して特定量のリン酸塩系分散剤を添加することによって、水の添加量が少ない場合であっても均一な可塑化液を製造することができ、高強度化、軽量化等の目的に応じた各種の配合組成の注入材を作製することが可能となる。
【0030】
また、可塑化液中の水分量を従来より減少できるので、運搬費用を低減でき、可塑化液を工場で製造して施工現場に運搬し、必要に応じて、現場で希釈して、施工に適したフロー値、可塑材濃度等に調節して施工することによって、施工現場における可塑化液の製造プラントを不要とすることができる。
【0031】
【発明の効果】
以上の通り、本発明の可塑性注入材の注入方法によれば、可塑化液における水分量を低減できるので、各種配合組成の注入材を製造することが可能となる。また、可塑化液の輸送費が低減されるため、可塑化液を工場で製造して施工現場に運搬して施工することが可能となり、施工現場における可塑化液の製造プラントが不要となり、施工設備を簡略化してコスト低減を図ることができる。
【0032】
【実施例】
以下、実施例を挙げて本発明を更に詳細に説明する。
【0033】
実施例1
下記表1に記載した配合割合でアタパルジャイト、ピロリン酸ナトリウム及び水を往復撹拌ミキサーで5分間調製して可塑化液を調製した。
【0034】
得られた可塑化液について、下記の方法でフロー値の測定を行い、可塑化液としての適性を判定した。
*フロー値測定方法:
日本道路公団「エアモルタル及びエアミルクの試験方法(JHSA313−1992)」のコンシステンシー試験方法のシリンダー法に準拠して、内径8cm高さ8cmのシリンダーに試料を入れ、引き抜き後の試料の底面の直径を測定した。
*判定:
判定基準は下記の通りである。
【0035】
○:均一な懸濁液となる
×:材料分離又は混練不可
【0036】
【表1】

Figure 0003674559
【0037】
上記した結果から判るように、アタパルジャイト:水=1:1.7〜2であって、ピロリン酸ナトリウムの添加量がアタパルジャイト100重量部に対して1.2〜4重量部の場合に、均一な懸濁液を調製できた(配合例2〜4、7)。
【0038】
尚、これらの試料の内でフロー値が小さいものに関しては、使用時に適度なフロー値となるように水で希釈して用いてもよい。
実施例2
下記表2に示す割合でセメント(商標名:JETMS A材、住友大阪セメント(株)製)と水をハンドミキサーで混練して水セメント比(W/c)が0.5のセメントミルクを調製した。気泡を混入する場合には、更に、所定の混入量となるように気泡(起泡剤を水で25倍希釈後、25倍発泡させたもの)を投入し、ミキサーで30秒混合してセメントエアミルクを作製した。
【0039】
可塑化液は、実施例1と同様の方法で、下記表2に示す配合割合となるように調製した。
【0040】
これらのセメントミルクと可塑化液を表2に示す配合割合(注入材1m3中の重量(kg))となるようにハンドミキサーで10〜15秒程度混合して注入材料を調製した。
【0041】
得られた注入材料を供試体型枠に打設し、室温で28日間養生して硬化体を得た。
【0042】
得られた硬化体の密度及び一軸圧縮強さ(材齢28日)を下記表2に示す。
【0043】
表2に記載した試料の内で、配合例8は、従来の注入材料の配合例であり、配合例9は本発明の注入材料の内で、気泡を含むセメントミルクを用いて得られる軽量硬化体の配合例であり、配合例10は、セメントミルクの配合量の多い高強度硬化体の配合例である。
【0044】
【表2】
Figure 0003674559
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for injecting a plastic injection material that can be used for cavity filling of civil engineering structures, lightweight embankment, landfill, and the like.
[0002]
[Prior art]
When there is groundwater or running water in the cavity filling portion, the injection material may be required to have properties as a gel-like aggregate in order to prevent the injection material from being diluted with groundwater or running water. In addition, when the filling part is injected in a limited section, there is a problem that normal cement milk-based injecting material has a problem of deviating to the surroundings and limited injection cannot be performed. The property as an aggregate is requested | required. Thus, the property which becomes a gelled aggregate state and does not easily divert to the surroundings due to its shape imparting property without being diluted into groundwater or running water is referred to as “plasticity” in the present specification.
[0003]
For the reasons described above, conventionally, in the injection of cement milk, cement air milk or the like, a technique of adding plasticity to the injection material by adding a water glass chemical or aluminum salt to the cement milk or the like has been used. However, these injection materials are inferior in durability, have a problem of groundwater contamination, and are not sufficiently satisfactory in terms of price and the like.
[0004]
On the other hand, plasticization consisting of cement milk and bentonite milk in which bentonite is suspended in water as a material that becomes a plastic body instantly using materials that are chemically stable, excellent in durability, inexpensive and easily available An injection material obtained by mixing and stirring a liquid has been reported (Japanese Patent Laid-Open No. 11-310779).
[0005]
In addition, an injection material using metakaolin or attapulgite instead of bentonite as a plasticizing liquid has been reported (Japanese Patent Laid-Open No. 2001-48629).
[0006]
In such an injection material composed of cement milk and a plasticizing liquid, in order to uniformly disperse a plastic material such as bentonite in the plasticizing liquid without becoming lumpy, usually, water is added to the plastic material. It is necessary to use at least about times the weight, and generally, a plasticizer of a ratio of about plasticizer: water = 1: 6.2 to 7.1 is used.
[0007]
However, these plasticizing liquids contain a large amount of water, and there is a problem that it takes time and effort to knead, pump and carry. In addition, if the injection material contains an amount of plasticizer necessary for sufficiently exhibiting the plasticizing performance, the proportion of the plasticizing liquid inevitably increases, and the amount of cement per unit volume of the injection material increases. It is limited and it becomes difficult to increase the strength. Also, even if bubbles are mixed into cement milk to reduce the weight, there is still a problem that the amount of bubbles per unit volume of the injection material is limited and the weight cannot be reduced sufficiently.
[0008]
[Problems to be solved by the invention]
The main object of the present invention is a method for injecting a plastic injection material obtained by kneading cement milk and a plasticizing liquid, and reducing the amount of water added to the plasticizing liquid without inhibiting the dispersibility of the plastic material. A novel method for injecting a plastic injection material that makes it easy to prepare and transport a plasticizing liquid, and can have various blending compositions according to the purpose of increasing strength, reducing weight, etc. Is to provide.
[0009]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above-mentioned object, the present inventor selected attapulgite as a plasticizer to be blended in the plasticizing liquid, and further, 1.2 to 4 parts by weight with respect to 100 parts by weight of attapulgite. When adding a specific amount of phosphate-based dispersant, even when the amount of water added is reduced compared to conventional plasticizing liquid, the plasticizer is uniformly dispersed without causing lumps It has been found that a suspension can be obtained, and that the above-described object can be achieved, and the present invention has been completed.
[0010]
That is, the present invention provides the following plastic injection material.
1. A plasticized injection material is prepared by stirring and mixing a plasticizing liquid containing 100 parts by weight of attapulgite, 1.2 to 4 parts by weight of a phosphate dispersant and 170 to 500 parts by weight of water, and the injection material. A method for injecting a plastic injection material, characterized by injecting the material into a construction site.
2. The method for injecting a plastic injection material according to the above item 1, wherein the plasticizing liquid is further diluted with water and then stirred and mixed with cement milk.
3. After diluting the plasticizing liquid containing 100 parts by weight of attapulgite, 1.2 to 4 parts by weight of a phosphate-based dispersant and 170 to 500 parts by weight of water, which is manufactured in a factory and transported to a construction site, as it is or with water A method for injecting a plastic injection material, characterized by producing a plastic injection material by stirring and mixing with cement milk and injecting the injection material into a construction site.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The plastic injection material used in the injection method of the present invention is a mixture of a plasticizing liquid containing a plastic material and cement milk, which is instantly plasticized and used as an injection material.
[0012]
In the present invention, it is necessary to use attapulgite as a plastic material to be blended with the plasticizing liquid in the injection material. The quality of the attapulgite is not particularly limited, but a powder having a particle size of not more than 80 mesh sieve is preferable.
[0013]
It is necessary to add about 1.2 to 4 parts by weight of a phosphate dispersant to 100 parts by weight of attapulgite.
[0014]
By adding the above-mentioned specific amount of phosphate-based dispersant to attapulgite, even if the amount of water added is small compared to the conventional plasticizing liquid, there will be no fouling and uniform suspension. It can be made a turbid liquid, and the amount of water added can be as small as about 200 parts by weight with respect to 100 parts by weight of attapulgite. There is no particular limitation on the upper limit of the amount of water added, and it can be appropriately set according to the purpose of use within a range where separation of attapulgite does not occur. It is appropriate to reduce the amount of water added in the plasticizing liquid as much as possible. Usually, it is about 170 to 500 parts by weight, preferably about 170 to 400 parts by weight, more preferably 170 to 300 parts by weight with respect to 100 parts by weight of attapulgite. The amount of water added is about parts by weight.
[0015]
Further, this plasticizing liquid can have an appropriate fluidity suitable for pumping with a flow value of about 200 m, and when it is mixed with cement milk, it has the same plasticity as in the prior art.
[0016]
As the phosphate dispersant to be blended in the plasticizing liquid, potassium pyrophosphate, sodium pyrophosphate, sodium tripolyphosphate, sodium tetrapolyphosphate and the like can be used.
[0017]
Cement milk is a suspension in the form of milk mainly composed of cement and water. As cement, various portland cements such as normal, early strength, super early strength, white color, sulfate resistance, moderate heat, low heat, etc. It can be selected from mixed cement obtained by mixing at least one type of Portland cement and at least one type such as blast furnace slag and fly ash, special cement such as jet cement and alumina cement, cement-based solidified material, and the like.
[0018]
The cement milk may be made into cement air milk by mixing bubbles obtained by foaming a foaming agent as necessary. Further, the specific gravity of the plastic injection material may be adjusted by adding sand, reki, foam beads or the like to cement milk.
[0019]
Furthermore, admixtures such as water reducing agents, retarders, and dispersing agents may be added to cement milk as necessary, and even when these admixtures are added, there is almost no effect on plasticity after kneading. There is no. By adding a water reducing agent, the amount of unit water in cement milk can be reduced or the amount of unit cement can be increased, and the range of blending design for increasing strength and reducing weight can be expanded. By adding a retarder, it is possible to prevent hardening inside the equipment such as transportation piping and reduce washing of the equipment. Addition of a dispersant improves the fluidity and can extend the transport distance by piping or the like.
[0020]
The amount of water added in the cement milk may be in a range in which homogeneous cement milk can be prepared, and is usually in a range of cement: water (weight ratio) = 1: 0.3 to 1: 1.
[0021]
In the present invention, the plasticizing liquid and cement milk prepared in advance as described above are suspended, and these are instantaneously mixed.
[0022]
The mixing ratio of the plasticizing liquid and cement milk in the injecting material is not particularly limited and may be appropriately determined depending on the purpose of use, but if the amount of attapulgite in the injecting material is too small, sufficient plastic performance cannot be exhibited, On the other hand, if the amount of attapulgite is too large, the resistance at the time of injection increases and the cost also increases. For this reason, it is usually preferable to mix so that the amount of attapulgite in the injected material is in the range of about 30 to 130 kg / m 3 .
[0023]
The cement milk is supersaturated with calcium ions released from the cement and filled with positively charged calcium ions.
[0024]
On the other hand, in the plasticizing liquid, attapulgite swells and is charged to negative ions.
[0025]
By stirring and mixing such plasticizing liquid and cement milk as suspensions, the negative charge on the attapulgite surface is neutralized with calcium plus ions, and the agglomeration action is based on the intermolecular force of the attapulgite particles. The mixture is plasticized instantly, and an excellent plastic injection material that does not separate in water is obtained.
[0026]
In order to instantly and uniformly plasticize in this way, mixing of suspensions is essential, and in the method of directly mixing cement powder into attapulgite suspension, it takes time to dissolve calcium ions. It is difficult to plasticize instantly.
[0027]
In the present invention, by adding the above-mentioned specific amount of phosphate-based dispersant to attapulgite, the amount of attapulgite: water (weight ratio) is about 1: 2, which is very small compared to the conventional plasticizing liquid. Even if it is the addition amount of water, it can be set as a uniform and stable plasticizing liquid. In the injection material, a plasticizer (attapulgite) in an amount necessary for exhibiting an appropriate plastic performance according to the purpose is blended. By using a plasticizing liquid with a small amount of water as described above, the injection material is injected. The amount of cement milk used per unit volume of the material can be increased as compared with conventional injection materials, and a high-strength hardened body with a large amount of cement per unit volume can be obtained. Moreover, also when using the cement milk (cement air milk) containing a bubble, the amount of bubbles per unit volume of an injection material can be increased conventionally, and the weight reduction of a hardening body is also attained. Of course, if the amount of water in the plasticizing liquid is about the same as that of the prior art, it is possible to obtain the same composition as that of the prior art.
[0028]
The amount of bubbles mixed is preferably about 75% by volume or less of the amount of the plastic injection material. If the amount of bubbles is too large, strength and plasticity are liable to decrease, which is inappropriate.
[0029]
Thus, according to the present invention, by adding a specific amount of phosphate dispersant to attapulgite, a uniform plasticizing liquid can be produced even when the amount of water added is small. It is possible to produce injection materials having various blending compositions according to the purpose of increasing the strength and reducing the weight.
[0030]
In addition, since the amount of water in the plasticizing liquid can be reduced compared to the conventional method, transportation costs can be reduced, and the plasticizing liquid is manufactured at the factory and transported to the construction site. By adjusting to a suitable flow value, plastic material concentration, etc., it is possible to eliminate the need for a plasticizing liquid production plant at the construction site.
[0031]
【The invention's effect】
As described above, according to the method for injecting a plastic injection material of the present invention, the amount of water in the plasticizing liquid can be reduced, so that it is possible to manufacture injection materials having various blending compositions. In addition, since the transportation cost of the plasticizing liquid is reduced, it is possible to manufacture the plasticizing liquid at the factory and transport it to the construction site for installation, eliminating the need for a plasticizing liquid manufacturing plant at the construction site. Equipment can be simplified and cost reduction can be achieved.
[0032]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples.
[0033]
Example 1
A plasticizing solution was prepared by preparing attapulgite, sodium pyrophosphate and water for 5 minutes with a reciprocating stirring mixer at the blending ratio shown in Table 1 below.
[0034]
About the obtained plasticization liquid, the flow value was measured with the following method and the suitability as a plasticization liquid was determined.
* Flow value measurement method:
In accordance with the cylinder method of the Consistency Test Method of Japan Highway Public Corporation “Air Mortar and Air Milk Test Method (JHSA 313-1992)”, the diameter of the bottom surface of the sample after drawing into a cylinder with an inner diameter of 8 cm and a height of 8 cm Was measured.
* Judgment:
The judgment criteria are as follows.
[0035]
○: A uniform suspension is obtained. ×: Material separation or kneading is impossible.
[Table 1]
Figure 0003674559
[0037]
As can be seen from the above results, when attapulgite: water = 1: 1.7-2 and the amount of sodium pyrophosphate added is 1.2-4 parts by weight with respect to 100 parts by weight of attapulgite, uniform Suspensions could be prepared (Formulation Examples 2 to 4 and 7).
[0038]
Of these samples, those having a small flow value may be diluted with water so that an appropriate flow value is obtained during use.
Example 2
Cement milk having a water cement ratio (W / c) of 0.5 is prepared by kneading cement (trade name: JETMS A material, manufactured by Sumitomo Osaka Cement Co., Ltd.) and water with a hand mixer at the ratio shown in Table 2 below. did. When bubbles are mixed, the bubbles are added (foaming agent is diluted 25-fold with water and then expanded 25-fold) and mixed with a mixer for 30 seconds to obtain a predetermined mixing amount. Air milk was prepared.
[0039]
The plasticizing liquid was prepared in the same manner as in Example 1 so as to have the blending ratio shown in Table 2 below.
[0040]
These cement milk and plasticizing liquid were mixed for about 10 to 15 seconds with a hand mixer so as to have a blending ratio shown in Table 2 (weight (kg) in 1 m 3 of injection material) to prepare an injection material.
[0041]
The obtained injection material was placed in a specimen mold and cured at room temperature for 28 days to obtain a cured body.
[0042]
The density and uniaxial compressive strength (age 28 days) of the obtained cured product are shown in Table 2 below.
[0043]
Among the samples described in Table 2, Formulation Example 8 is a blending example of a conventional injection material, and Formulation Example 9 is a lightweight curing obtained by using cement milk containing bubbles in the injection material of the present invention. The blending example 10 is a blending example of a high-strength hardened body with a large blending amount of cement milk.
[0044]
[Table 2]
Figure 0003674559

Claims (3)

アタパルジャイト100重量部、リン酸塩系分散剤1.2〜4重量部及び水170〜500重量部を含む可塑化液と、セメントミルクとを撹拌混合して可塑性注入材を作製し、該注入材を施工場所に注入することを特徴とする可塑性注入材の注入方法。A plasticized injection material is prepared by stirring and mixing a plasticizing liquid containing 100 parts by weight of attapulgite, 1.2 to 4 parts by weight of a phosphate-based dispersant and 170 to 500 parts by weight of water, and cement milk. A method for injecting a plastic injection material, characterized by injecting the material into a construction site. 前記可塑化液を更に水で希釈した後、これをセメントミルクと撹拌混合することを特徴とする請求項1に記載の可塑性注入材の注入方法。The method for injecting a plastic injection material according to claim 1, wherein the plasticizing liquid is further diluted with water and then mixed with cement milk while stirring. 工場で製造され、施工現場に搬送されたアタパルジャイト100重量部、リン酸塩系分散剤1.2〜4重量部及び水170〜500重量部を含む可塑化液を、そのまま又は水で希釈した後、セメントミルクと撹拌混合して可塑性注入材を作製し、該注入材を施工場所に注入することを特徴とする可塑性注入材の注入方法。After diluting the plasticizing liquid containing 100 parts by weight of attapulgite, 1.2 to 4 parts by weight of a phosphate-based dispersant and 170 to 500 parts by weight of water, which is manufactured in a factory and transported to a construction site, as it is or with water A method for injecting a plastic injection material, characterized by producing a plastic injection material by stirring and mixing with cement milk and injecting the injection material into a construction site.
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