JP2001003048A - Admixture for soil cement - Google Patents
Admixture for soil cementInfo
- Publication number
- JP2001003048A JP2001003048A JP17452799A JP17452799A JP2001003048A JP 2001003048 A JP2001003048 A JP 2001003048A JP 17452799 A JP17452799 A JP 17452799A JP 17452799 A JP17452799 A JP 17452799A JP 2001003048 A JP2001003048 A JP 2001003048A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- water
- admixture
- soil cement
- soil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0045—Polymers chosen for their physico-chemical characteristics
- C04B2103/0053—Water-soluble polymers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
- C04B2111/1018—Gypsum free or very low gypsum content cement compositions
Landscapes
- 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)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ソイルセメント壁
体形成において、施工場所で土砂等とセメントミルクを
混合する際に、セメントミルクが施工場所以外へ流出す
ることを防止するためのソイルセメント用混和剤に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil cement for preventing soil milk from flowing out of a construction site when soil and sand are mixed with the cement milk at the construction site in forming a soil cement wall. It relates to an admixture.
【０００２】[0002]
【従来の技術】ソイルセメント壁体は、土止め壁、地盤
改良等に使用されており、そのソイルセメント壁体形成
方法は、オーガーマシン等で施工位置の土砂を掘削しな
がら、セメントミルクなどのセメント系硬化液を掘削位
置に噴出させ、施工位置において土砂等とセメント系硬
化液を混合して硬化させてソイルセメント壁体を形成す
る。この方法は、施工位置により、施工条件が変化する
が、施工位置が透水性の大きい砂礫層、砂質層の場合
は、セメント系硬化液が土砂中や地下水中の施工場所以
外の場所へ流出する問題がある。2. Description of the Related Art Soil cement walls are used for retaining walls, ground improvement, and the like. The method of forming the soil cement walls is performed by excavating earth and sand at a construction position using an auger machine or the like, while removing cement milk or the like. A cement-based hardening liquid is jetted to an excavation position, and soil and the like and a cement-based hardening liquid are mixed and hardened at a construction position to form a soil cement wall. In this method, the construction conditions vary depending on the construction location.However, if the construction location is a highly permeable gravel layer or sandy layer, the cement-based hardening liquid will flow out of the soil and other places other than the construction location in the groundwater. There is a problem to do.
【０００３】上記のような施工場所以外へのセメント系
硬化液の流出を防止するため、セメント系硬化液へ水溶
性高分子を配合して増粘させる方法が行われているが、
水溶性高分子をそのまま添加すると、セメント系硬化液
中に均一に溶解・分散しない「ママコ現象」が起きるた
め、水に予め水溶性高分子を溶解・分散させた後、セメ
ント系硬化液中に添加していた。この方法は、セメント
系硬化液作成時に、溶解・分散作業を２度行わなければ
ならないため、煩雑で、作業時間の短縮化が望まれてい
た。[0003] In order to prevent the cement-based hardening liquid from flowing out to a place other than the construction site as described above, a method of adding a water-soluble polymer to the cement-based hardening liquid to increase the viscosity has been performed.
If the water-soluble polymer is added as it is, a `` mamako phenomenon, '' which does not dissolve and disperse uniformly in the cement-based hardening liquid, will occur. Had been added. In this method, since the dissolution / dispersion operation must be performed twice when preparing the cement-based hardening liquid, the method is complicated, and it has been desired to reduce the operation time.
【０００４】また、水溶性高分子に硫酸塩を配合した混
和剤を使用し、作業時間の短縮を計る方法もあるが、硫
酸塩は水溶性高分子に対し大量に配合する必要があり、
コスト的に不利な上、ソイルセメントの硬化に影響を与
える恐れもあった。[0004] There is also a method of shortening the working time by using an admixture in which a sulfate is mixed with a water-soluble polymer, but it is necessary to mix a large amount of the sulfate with the water-soluble polymer.
In addition to being disadvantageous in terms of cost, there is a possibility that the setting of the soil cement may be affected.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、セメント系
硬化液に粉体状のまま添加でき、液中への均一に溶解・
分散できて、作業時間の短縮が可能なソイルセメント用
混和剤を提供することを目的とする。SUMMARY OF THE INVENTION The present invention can be added as a powder to a cement-based hardening liquid, and can be uniformly dissolved in the liquid.
An object of the present invention is to provide an admixture for soil cement that can be dispersed and can shorten the operation time.
【０００６】[0006]
【課題を解決するための手段】本発明は、粉末状の水溶
性高分子１００重量部に対し、無機微粉末（硫酸塩を除
く）を５０〜５００重量部の割合で配合してなるソイル
セメント用混和剤、および主として水硬性粉体、粘土鉱
物、水からなるセメントミルクに上記ソイルセメント用
混和剤を配合してなるセメント系硬化液、さらに主とし
て水硬性粉体、粘土鉱物、水からなるセメントミルク
へ、上記ソイルセメント用混和剤を添加し、混合した
後、ソイルセメント壁体形成位置の砂および／または土
と混合することを特徴とするソイルセメント壁体形成方
法を提供する。The present invention provides a soil cement comprising 100 parts by weight of a powdery water-soluble polymer and 50 to 500 parts by weight of an inorganic fine powder (excluding a sulfate). -Based admixture, and a cement-based hardening liquid obtained by mixing the above-mentioned admixture for soil cement with cement milk mainly composed of hydraulic powder, clay mineral and water, and cement mainly composed of hydraulic powder, clay mineral and water A method for forming a soil cement wall, characterized by adding the above-mentioned admixture for soil cement to milk, mixing the mixture, and then mixing the mixture with sand and / or soil at a position where the soil cement wall is formed.
【０００７】本発明のソイルセメント用混和剤は、無機
微粉末（硫酸塩を除く）と粉末状の水溶性高分子を配合
することにより、水溶性高分子を粉末状のまま、セメン
トミルクへ添加でき、「ママコ現象」も防止することが
できるため、セメント系硬化液の作成が容易になり、作
業時間も短縮できる。[0007] The admixture for soil cement of the present invention is obtained by blending an inorganic fine powder (excluding sulfates) and a powdery water-soluble polymer, and adding the water-soluble polymer to the cement milk as it is in a powdery state. It is also possible to prevent the "mamako phenomenon", so that the preparation of the cement-based hardening liquid becomes easy and the working time can be shortened.
【０００８】[0008]
【発明の実施の形態】本発明のソイルセメント用混和剤
は、粉末状の水溶性高分子１００重量部に対し、無機微
粉末（硫酸塩を除く）を５０〜５００重量部の割合で配
合する。無機微粉末の配合量が５００重量部を超えても
配合の効果は増大せず、コスト的に不利となり、配合量
が５０重量部未満であると配合の効果が得られず、セメ
ントミルクへ添加時に「ママコ現象」が生じる。BEST MODE FOR CARRYING OUT THE INVENTION The admixture for soil cement of the present invention comprises 50 to 500 parts by weight of an inorganic fine powder (excluding sulfates) per 100 parts by weight of a powdery water-soluble polymer. . If the amount of the inorganic fine powder exceeds 500 parts by weight, the effect of the compounding does not increase, and the cost is disadvantageous. If the compounding amount is less than 50 parts by weight, the effect of the compounding is not obtained, and it is added to the cement milk. Sometimes the "Mamako phenomenon" occurs.
【０００９】本発明に使用する無機微粉末は、硫酸塩以
外の無機微粉末であれば、特に限定されず、フライアッ
シュ、シリカパウダー、ゼオライト、石灰石微粉末、粉
末粘土、セピオライト、アタパルジャイト、クレイ、ベ
ントナイト等が挙げられる。これらは１種を単独で使用
しても、あるいは２種以上を混合して使用しても良い。The inorganic fine powder used in the present invention is not particularly limited as long as it is an inorganic fine powder other than a sulfate. Fly ash, silica powder, zeolite, limestone fine powder, powdered clay, sepiolite, attapulgite, clay, Bentonite and the like can be mentioned. These may be used alone or as a mixture of two or more.
【００１０】本発明に使用する無機微粉末の粒子径、粒
子形状は、セメント系硬化液作成時に、液中へ溶解・分
散が可能であれば特に限定されない。The particle diameter and particle shape of the inorganic fine powder used in the present invention are not particularly limited as long as they can be dissolved and dispersed in a cement-based hardening liquid at the time of preparation.
【００１１】本発明に使用する粉末状の水溶性高分子と
しては、粉末状の非イオン性水溶性セルロースエーテル
等の水溶性セルロース誘導体、グアガム、アルギン酸ナ
トリウム、カラギーナン、トラガントガム等の水溶性天
然ガム類およびその誘導体、α化デンプン、カルボキシ
メチル化デンプン等の水溶性デンプンおよびその誘導
体、ポリエチレングリコール、ポリプロピレングリコー
ル、ポリビニルアルコール、ポリアクリル酸ナトリウ
ム、ポリアクリルアミド、ポリエチレンオキサイド、ス
チレン・マレイン酸共重合体等の水溶性合成高分子など
が挙げられるが、好ましくは非イオン性水溶性セルロー
スエーテルを用いるのがよい。これらはグリオキザール
処理したものであっても良い。The powdery water-soluble polymer used in the present invention includes powdery water-soluble cellulose derivatives such as nonionic water-soluble cellulose ethers, and water-soluble natural gums such as guar gum, sodium alginate, carrageenan, tragacanth gum and the like. And its derivatives, pregelatinized starch, water-soluble starch such as carboxymethylated starch and its derivatives, polyethylene glycol, polypropylene glycol, polyvinyl alcohol, sodium polyacrylate, polyacrylamide, polyethylene oxide, styrene / maleic acid copolymer, etc. Although a water-soluble synthetic polymer and the like are mentioned, it is preferable to use a nonionic water-soluble cellulose ether. These may be those treated with glyoxal.
【００１２】非イオン性水溶性セルロースエーテルとし
ては、、ヒドロキシエチルセルロース（ＨＥＣ）、ヒド
ロキシプロピルセルロース（ＨＰＣ）等のヒドロキシア
ルキルセルロース；メチルセルロース（ＭＣ）等のアル
キルセルロース；ヒドロキシプロピルメチルセルロース
（ＨＰＭＣ）ヒドロキシエチルメチルセルロース（ＨＭ
ＥＣ）等のヒドロキシアルキルアルキルセルロース；カ
ルボキシメチルヒドロキシセルロース（ＣＭＨＥＣ）等
のカルボキシアルキルヒドロキシアルキルセルロース；
カルボキシアルキルセルロースなどが挙げられ、好まし
くはヒドロキシエチルセルロースが良い。Examples of nonionic water-soluble cellulose ethers include hydroxyalkyl cellulose such as hydroxyethyl cellulose (HEC) and hydroxypropyl cellulose (HPC); alkyl cellulose such as methyl cellulose (MC); hydroxypropyl methyl cellulose (HPMC) hydroxyethyl methyl cellulose (HM
Hydroxyalkylalkylcellulose such as EC); carboxyalkylhydroxyalkylcellulose such as carboxymethylhydroxycellulose (CMHEC);
Carboxyalkyl cellulose and the like can be mentioned, and hydroxyethyl cellulose is preferable.
【００１３】また、好ましくは上記水溶性高分子が、１
ｗｔ％水溶液としたときの粘度（Ｂ型粘度計により、２
５℃、３０ｒｐｍで測定した値）が３００〜１００００
ｍＰａ・ｓであるヒドロキシエチルセルロースであるの
が良い。１ｗｔ％水溶液としたときの粘度が、３００ｍ
Ｐａ・ｓ未満であると、本発明の効果が得られにくく、
１００００ｍＰａ・ｓを超えると、コスト的に不利とな
りやすい。Preferably, the water-soluble polymer is
wt% aqueous solution (by B-type viscometer, 2%
(Value measured at 5 ° C. and 30 rpm) is 300 to 10,000
It is preferably hydroxyethyl cellulose having a mPa · s. 300m viscosity when made into 1wt% aqueous solution
When it is less than Pa · s, it is difficult to obtain the effects of the present invention,
If it exceeds 10,000 mPa · s, it tends to be disadvantageous in terms of cost.
【００１４】本発明のソイルセメント用混和剤におい
て、粉末状の水溶性高分子と無機微粉末の混合方法は特
に限定されず、通常一般に使用される混合機等を用いて
混合することができる。In the admixture for soil cement of the present invention, the mixing method of the powdery water-soluble polymer and the inorganic fine powder is not particularly limited, and the mixing can be carried out using a generally used mixer or the like.
【００１５】本発明のソイルセメント用混和剤には、必
要に応じて、本発明の作用を阻害しない範囲で、他の添
加剤を配合しても良い。If necessary, other additives may be added to the admixture for soil cement of the present invention as long as the effects of the present invention are not impaired.
【００１６】本発明のソイルセメント用混和剤は、セメ
ント系硬化液作成時に、主として水硬性粉体、粘土鉱
物、水からなるセメントミルクへ添加し、混合してセメ
ント系硬化液として使用する。該セメント系硬化液を、
ソイルセメント壁体形成位置の砂および／または土と混
合することによりソイルセメント壁体を形成することが
できる。本発明のソイルセメント用混和剤を使用するこ
とにより、水溶性高分子によるセメント系硬化液の土砂
や地下水中への流出を防止できる上、水溶性高分子のセ
メントミルクへの配合が容易になり、作業時間を短縮す
ることができる。[0016] The admixture for soil cement of the present invention is added to a cement milk mainly composed of hydraulic powder, clay mineral and water at the time of preparing a cement-based hardening solution, mixed and used as a cement-based hardening solution. The cement-based curing liquid,
The soil cement wall can be formed by mixing with sand and / or soil at the soil cement wall formation position. By using the admixture for soil cement of the present invention, it is possible to prevent the cement-based hardening liquid from flowing out into earth and sand or groundwater due to the water-soluble polymer, and to easily mix the water-soluble polymer into the cement milk. , Work time can be reduced.
【００１７】本発明のソイルセメント用混和剤のセメン
ト系硬化液作成時のセメントミルクへの配合量は、セメ
ント系硬化液の粘度が好ましくは粘度（Ｂ型粘度計によ
り、２５℃、３０ｒｐｍで測定した値）が１００〜２５
００ｍＰａ・ｓとなる量であるのがよい。セメント系硬
化液の粘度が１００ｍＰａ・ｓ未満であると、本発明の
効果が得られにくく、２５００ｍＰａ・ｓを超えると、
施工時の圧送等の取り扱いが難しくなり、また、ソイル
セメントの硬化時間が長くなる。具体的には、本発明の
ソイルセメント用混和剤中の水溶性高分子がセメントに
対し、０．０５〜２．０重量％となるのが好ましい。The mixing amount of the admixture for soil cement of the present invention in the cement milk at the time of preparing the cement-based hardening liquid is preferably the viscosity of the cement-based hardening liquid (measured at 25 ° C. and 30 rpm by a B-type viscometer). Value) is 100 to 25
The amount is preferably 00 mPa · s. If the viscosity of the cement-based hardening liquid is less than 100 mPa · s, it is difficult to obtain the effects of the present invention, and if it exceeds 2500 mPa · s,
Handling such as pressure feeding during construction becomes difficult, and the hardening time of the soil cement becomes long. Specifically, the amount of the water-soluble polymer in the admixture for soil cement of the present invention is preferably 0.05 to 2.0% by weight based on the cement.
【００１８】上記セメント系硬化液に使用する水硬性粉
体としては特に限定されず、通常一般に使用されるポル
トランドセメント、中庸熱ポルトランドセメント、白色
ポルトランドセメント、高炉セメント、シリカセメン
ト、フライアッシュセメント、膨張セメント等を使用で
き、これらは単独であっても２種以上を混合したもので
あっても良い。The hydraulic powder used in the above-mentioned cement-based hardening liquid is not particularly limited, and generally used portland cement, moderately heated portland cement, white portland cement, blast furnace cement, silica cement, fly ash cement, expanded Cement and the like can be used, and these may be used alone or as a mixture of two or more.
【００１９】上記セメント系硬化液に使用する粘土鉱物
としては特に限定されず、例えばベントナイト、粘性土
が挙げられる。粘土鉱物も単独であっても２種以上を混
合したものであっても良い。The clay mineral used in the cement-based hardening liquid is not particularly limited, and examples thereof include bentonite and clayey soil. The clay minerals may be used alone or as a mixture of two or more.
【００２０】上記セメント系硬化液に使用するセメント
ミルクを構成する水硬性粉体、粘土鉱物、水の配合割合
は、特に限定されず、通常一般のセメント系硬化液を作
成する場合と同様の割合とすることができる。The mixing ratio of the hydraulic powder, the clay mineral, and the water constituting the cement milk used in the cement-based hardening liquid is not particularly limited, and is usually the same as in the case of preparing a general cement-based hardening liquid. It can be.
【００２１】上記セメント系硬化液には、水硬性粉体、
粘土鉱物、水、および本発明のソイルセメント用混和剤
の他、本発明の作用を阻害しない範囲で消泡剤等の他の
添加剤を配合しても良い。The cement-based hardening liquid includes a hydraulic powder,
In addition to the clay mineral, water, and the soil cement admixture of the present invention, other additives such as an antifoaming agent may be added as long as the action of the present invention is not impaired.
【００２２】ソイルセメント壁体形成方法は、本発明の
ソイルセメント用混和剤を、セメント系硬化液作成時
に、セメントミルクへ添加して使用するのであれば特に
限定されず、通常一般のソイルセメント壁体形成方法と
同様に行うことができる。また、壁体形成時に強度増大
を目的としてＨ形鋼を立て込んでも良い。The method for forming a soil cement wall is not particularly limited as long as the soil cement admixture of the present invention is used by adding it to cement milk when preparing a cement-based hardening liquid. It can be performed in the same manner as the body formation method. Further, an H-section steel may be erected for the purpose of increasing the strength when the wall is formed.
【００２３】以下に、試験例および実施例を用いて本発
明の効果をさらに詳細に説明するが本発明はこれらに限
定されるものではない。 試験例 １． 試験方法 （１） セメント系硬化液の粘度測定 実施例１〜５、比較例１のソイルセメント用混和剤を配
合したセメント系硬化液（実施例６〜１０、比較例２）
について、Ｂ型粘度計により、２５℃、３０ｒｐｍで粘
度を測定した。Hereinafter, the effects of the present invention will be described in more detail with reference to Test Examples and Examples, but the present invention is not limited thereto. Test example Test method (1) Measurement of viscosity of cement-based hardening liquid Cement-based hardening liquid containing Examples 1 to 5 and the admixture for soil cement of Comparative Example 1 (Examples 6 to 10, Comparative Example 2)
Was measured for viscosity at 25 ° C. and 30 rpm using a B-type viscometer.
【００２４】（２）ソイルセメントの脱水量測定 実施例６〜１０、比較例２のセメント系硬化液と、含水
比重１．６５、含水率１０．６重量％の砂質土１６５０
ｇを配合して、モルタルミキサーにより５分間混練して
ソイルセメントを調整した（サンプル１〜６）。調整し
たソイルセメントについて、ＡＰＩ規格準拠の加圧濾過
試験器を用い、３Ｋｇ／ｃｍ2で３０分加圧濾過して、
濾過された濾過水量を測定し、脱水量とした。(2) Measurement of Dewatering Amount of Soil Cement Cement-based hardening liquids of Examples 6 to 10 and Comparative Example 2 and sandy soil 1650 having a specific gravity of water of 1.65 and a water content of 10.6% by weight.
g was blended and kneaded with a mortar mixer for 5 minutes to prepare soil cement (samples 1 to 6). The adjusted soil cement was subjected to pressure filtration at 3 kg / cm 2 for 30 minutes using an API standard pressure filtration tester.
The amount of the filtered water was measured and defined as the amount of dehydration.
【００２５】（３）ソイルセメントのブリージング率測
定 試験（２）で用いたソイルセメント（サンプル１〜６）
について、プレパックドコンクリートの注入モルタルの
ブリージング率試験方法（土木学会）に準じて、２４時
間後のブリージング率を測定した。(3) Measurement of Breathing Rate of Soil Cement Soil cement used in test (2) (samples 1 to 6)
, The breathing rate after 24 hours was measured in accordance with the method for testing the breathing rate of pre-packed concrete injected mortar (JSCE).
【００２６】２． 試験結果 上記試験（１）〜（３）の結果を表２に示す。2. Test Results Table 2 shows the results of the above tests (1) to (3).
【００２７】[0027]
【実施例】実施例１〜５ 粉末状のヒドロキシエチルセルロース（ＨＥＣ）［ダイ
セル化学工業（株）製：ＨＥＣダイセル ＳＰ６００］
とフライアッシュ［関電化工（株）製：フライアッシ
ュ］あるいはシリカパウダー［敦賀セメント（株）製：
シリカ１００］を表１に示す割合で配合し、混合してソ
イルセメント用混和剤を製造した。EXAMPLES Examples 1 to 5 Powdered hydroxyethyl cellulose (HEC) [manufactured by Daicel Chemical Industries, Ltd .: HEC Daicel SP600]
And fly ash [Kanden Kako Co., Ltd .: Fly ash] or silica powder [Tsuruga Cement Co., Ltd .:
Silica 100] was blended in the proportions shown in Table 1 and mixed to produce an admixture for soil cement.
【００２８】比較例１ 粉末状のヒドロキシエチルセルロース（ＨＥＣ）［ダイ
セル化学工業（株）製：ＨＥＣダイセル ＳＰ６００］
を比較例１とした。Comparative Example 1 Hydroxyethylcellulose (HEC) in powder form [HEC Daicel SP600 manufactured by Daicel Chemical Industries, Ltd.]
Was set as Comparative Example 1.
【００２９】実施例６〜１０、比較例２ 高炉セメントＢ種［（株）トクヤマ製：高炉セメントＢ
種］２５５ｇ、ベントナイト[豊洋製：ベントナイト
２５０ｍｅｓｈ]１５．３ｇ、水５１０ｇを混合してセ
メントミルクを作成し、さらにセメントの重量に対し表
２に示す割合で実施例１〜５、比較例１のソイルセメン
ト用混和剤を配合して、混合し、セメント系硬化液を作
成した。Examples 6 to 10 and Comparative Example 2 Blast furnace cement B [Blast furnace cement B manufactured by Tokuyama Corporation]
Seed] 255 g, bentonite [Toyoyo: Bentonite
250mesh] 15.3 g and water 510 g were mixed to prepare a cement milk, and the soil cement admixtures of Examples 1 to 5 and Comparative Example 1 were further blended at a ratio shown in Table 2 with respect to the weight of the cement. The mixture was mixed to prepare a cement-based hardening liquid.
【００３０】[0030]
【表１】 [Table 1]
【００３１】[0031]
【表２】 [Table 2]
【００３２】[0032]
【発明の効果】本発明のソイルセメント用混和剤を使用
することにより、水溶性高分子によるセメント系硬化液
の土砂や地下水中への流出を防止できる上、無機微粉末
（硫酸塩を除く）と粉末状の水溶性高分子を配合するこ
とにより、水溶性高分子を粉末状のまま、セメントミル
クへ添加でき、「ママコ現象」も防止することができる
ため、セメント系硬化液の作成が容易になり、作業時間
も短縮できる。EFFECTS OF THE INVENTION By using the admixture for soil cement of the present invention, it is possible to prevent the cement-based hardening liquid due to the water-soluble polymer from flowing out into earth and sand and groundwater, and to further remove inorganic fine powder (excluding sulfates). And powdered water-soluble polymer, the water-soluble polymer can be added to the cement milk as it is in powder form and the "mamako phenomenon" can be prevented. And work time can be shortened.
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０４Ｂ 28/00 Ｃ０４Ｂ 28/00 Ｃ０９Ｋ 17/44 Ｃ０９Ｋ 17/44 Ｐ 17/50 17/50 Ｐ // Ｃ０９Ｋ 103:00 Continued on the front page (51) Int.Cl. 7 Identification code FI Theme coat II (reference) C04B 28/00 C04B 28/00 C09K 17/44 C09K 17/44 P 17/50 17/50 P // C09K 103: 00
Claims (6)
し、無機微粉末（硫酸塩を除く）を５０〜５００重量部
の割合で配合してなることを特徴とするソイルセメント
用混和剤。1. An admixture for soil cement, comprising an inorganic fine powder (excluding sulfate) in a proportion of 50 to 500 parts by weight with respect to 100 parts by weight of a powdery water-soluble polymer. .
パウダー、ゼオライト、石灰石微粉末、粉末粘土、セピ
オライト、アタパルジャイト、クレイ、ベントナイトか
ら選ばれた１種あるいは２種以上の無機微粉末であるこ
とを特徴とする請求項１記載のソイルセメント用混和
剤。2. The method according to claim 1, wherein the inorganic fine powder is one or more inorganic fine powders selected from fly ash, silica powder, zeolite, limestone fine powder, powdered clay, sepiolite, attapulgite, clay and bentonite. The admixture for soil cement according to claim 1, wherein:
溶性セルロースエーテルであることを特徴とする請求項
１または２記載のソイルセメント用混和剤。3. The admixture for soil cement according to claim 1, wherein the powdery water-soluble polymer is a nonionic water-soluble cellulose ether.
液としたときの粘度（Ｂ型粘度計により、２５℃、３０
ｒｐｍで測定した値）が３００〜１００００ｍＰａ・ｓ
であるヒドロキシエチルセルロースであることを特徴と
する請求項１または２記載のソイルセメント用混和剤。4. The viscosity of a 1 wt% aqueous solution of a powdery water-soluble polymer (at 25 ° C., 30 ° C. by a B-type viscometer).
(measured at rpm) 300 to 10,000 mPa · s
The admixture for soil cement according to claim 1 or 2, which is hydroxyethyl cellulose.
なるセメントミルクに請求項１記載のソイルセメント用
混和剤を配合してなることを特徴とするセメント系硬化
液。5. A cement-based hardening liquid comprising a cement milk mainly composed of hydraulic powder, clay mineral and water, mixed with the admixture for soil cement according to claim 1.
なるセメントミルクへ、請求項１記載のソイルセメント
用混和剤を添加し、混合した後、ソイルセメント壁体形
成位置の砂および／または土と混合することを特徴とす
るソイルセメント壁体形成方法。6. Addition of the admixture for soil cement according to claim 1 to cement milk mainly composed of hydraulic powder, clay mineral and water, and after mixing, sand and / or at the soil cement wall formation position. A method for forming a soil cement wall, which comprises mixing with soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17452799A JP2001003048A (en) | 1999-06-21 | 1999-06-21 | Admixture for soil cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17452799A JP2001003048A (en) | 1999-06-21 | 1999-06-21 | Admixture for soil cement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001003048A true JP2001003048A (en) | 2001-01-09 |
Family
ID=15980096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17452799A Pending JP2001003048A (en) | 1999-06-21 | 1999-06-21 | Admixture for soil cement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001003048A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103011700A (en) * | 2011-09-26 | 2013-04-03 | 卢丹 | Wall coating composition, preparation method and application of wall coating composition and wall coating containing wall coating composition |
| JP2016121235A (en) * | 2014-12-24 | 2016-07-07 | あおみ建設株式会社 | Grout used for ground improvement method |
| KR20200037665A (en) * | 2018-10-01 | 2020-04-09 | 롯데정밀화학 주식회사 | Admixture for Cement Mortar Comprising Hydrophobic Silica and Preparation Method of Thereof |
-
1999
- 1999-06-21 JP JP17452799A patent/JP2001003048A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103011700A (en) * | 2011-09-26 | 2013-04-03 | 卢丹 | Wall coating composition, preparation method and application of wall coating composition and wall coating containing wall coating composition |
| JP2016121235A (en) * | 2014-12-24 | 2016-07-07 | あおみ建設株式会社 | Grout used for ground improvement method |
| KR20200037665A (en) * | 2018-10-01 | 2020-04-09 | 롯데정밀화학 주식회사 | Admixture for Cement Mortar Comprising Hydrophobic Silica and Preparation Method of Thereof |
| WO2020071685A1 (en) * | 2018-10-01 | 2020-04-09 | 롯데정밀화학 주식회사 | Cement mortar additive comprising hydrophobic silica, and preparation method therefor |
| KR102136717B1 (en) | 2018-10-01 | 2020-07-22 | 롯데정밀화학 주식회사 | Admixture for Cement Mortar Comprising Hydrophobic Silica and Preparation Method of Thereof |
| US11827565B2 (en) | 2018-10-01 | 2023-11-28 | Lotte Fine Chemical Co., Ltd. | Cement mortar additive comprising hydrophobic silica, and preparation method therefor |
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