JP6497990B2 - Liquid admixture for ground stabilization, ground stabilization material, and ground stabilization method using the same - Google Patents
Liquid admixture for ground stabilization, ground stabilization material, and ground stabilization method using the same Download PDFInfo
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本発明は、地中にセメントミルクを注入し、地盤を硬化、安定化させる地盤安定化用液体混和剤、地盤安定化材料、および地盤安定化工法に関する。 TECHNICAL FIELD The present invention relates to a ground stabilization liquid admixture, a ground stabilization material, and a ground stabilization method for injecting cement milk into the ground to harden and stabilize the ground.
軟弱地盤のような不安定な地盤を改良するためには、軟弱な地盤を硬化、安定化させなければならない。この際、セメント系固化材に水を混合したセメントスラリーを地盤に混合して固化させる方法がある。このような工法として、地盤改良工法、山留め工法、基礎杭工法、埋め戻し工法などがある。地盤改良工法としては、深層混合処理工法または浅層混合処理工法が代表例であり、山留め工法はソイルセメント柱列壁工法、ソイルセメント地中壁工法、基礎杭工法の代表例は、鋼管ソイルセメント杭工法や鋼管の代わりにＰＨ Ｃ杭などの既製杭を使用する合成杭工法などである。 In order to improve an unstable ground such as a soft ground, the soft ground must be hardened and stabilized. At this time, there is a method in which a cement slurry obtained by mixing water with a cement-based solidifying material is mixed with the ground and solidified. As such construction methods, there are a ground improvement construction method, a mountain retaining method, a foundation pile construction method, a backfilling construction method and the like. Typical examples of ground improvement methods are the deep-mixing method or the shallow-mixing method, and the pile-stop method is the soil cement column wall method, the soil cement underground wall method, and the foundation pile method is a steel pipe soil cement method. These include the pile method and synthetic pile method that uses ready-made piles such as PHC piles instead of steel pipes.
これらの工法は、セメントスラリーを地盤に注入するとセメント粒子と土の粒子とが電気的作用により互いに凝集するために、粘性が上昇し、施工し難い課題がある。また、粘性が高いと、注入したセメントスラリーと同体積の地盤と混入したスライムを排泥できず、地盤中で圧力がかかり地盤が隆起し地表面が盤膨れしてしまうという課題があった（非特許文献１参照）。 These methods have a problem that when cement slurry is injected into the ground, cement particles and soil particles are aggregated together due to electrical action, so that viscosity increases and it is difficult to construct. Also, if the viscosity is high, the ground of the same volume as the injected cement slurry and the mixed slime cannot be drained, and there is a problem that pressure is applied in the ground and the ground rises and the ground surface swells ( Non-patent document 1).
混合土の粘性を低下させるものとして、液状のものとしては、ナフタレンスルホン酸塩ホルマリン縮合物、メラミンスルホン酸塩ホルマリン縮合物、及び／又はポリカルボン酸系化合物等を含有する超高圧噴流注入工法用セメント添加剤が知られている（特許文献１参照）。
しかしながら、これらの超高圧噴流注入工法用セメント添加剤は、砂質土や砂分の多いシルト地盤では、その効果がある程度認められるものの、粘性土地盤においては、粘性低下の効果が小さいために多量に添加する必要があり、強度発現性が向上しにくいという課題があった。
一方、混合土の粘性を低下させるものとして、粉体のものとしては、リン酸塩、アルカリ金属含有物（硫酸塩、亜硫酸塩、炭酸塩、重炭酸塩等）、有機酸、およびアンモニウム塩等を含有する物質を組み合わせたものが知られている（特許文献２〜７参照）。
As a material for reducing the viscosity of the mixed soil, as a liquid material, an ultrahigh pressure jet injection method containing a naphthalene sulfonate formalin condensate, a melamine sulfonate formalin condensate, and / or a polycarboxylic acid compound, etc. Cement additives are known (see Patent Document 1).
However, these cement additives for ultra-high pressure jet injection method have some effect on sandy soil and sandy silt ground, but in viscous ground, the effect of lowering viscosity is small. There is a problem that it is difficult to improve strength development.
On the other hand, as powders that reduce the viscosity of the mixed soil, phosphates, alkali metal-containing materials (sulfates, sulfites, carbonates, bicarbonates, etc.), organic acids, ammonium salts, etc. The thing which combined the substance containing this is known (refer patent documents 2-7).
近年、セメント産業が各方面の産業副産物を原料に受け入れており、産業副産物に由来する微量成分が、セメントの品質に大きな影響を及ぼし、六価クロムの溶出量などにも大きな違いが出てくる。
特許文献８は、ＣａとＳを含む化合物である多硫化カルシウムに生石灰などの固定化材に担持させて、改良処理土の強度の低下をもたらすことなく、有害重金属溶出を著しく抑制する機能を付加した地盤改良材を提供することを目的としている。この文献には、固定化材である生石灰に担持させた後、セメントやセッコウと混合する技術が開示されている。
特許文献９は、Ｃａ８Ｓ５（Ｓ２Ｏ３）（ＯＨ）１２・２０Ｈ２Ｏ及び水酸化カルシウムを主成分とする重金属固定化剤であり、多硫化カルシウムとして市販の石灰硫黄合剤を用いることが記載されている。
しかしながら、これら文献では、混合土の粘性を低下させる効果が少なく、高い粘性低減効果の付与と六価クロムの溶出量を抑えることが可能となるとの知見を得て本発明を完成するに至った。
In recent years, the cement industry has accepted various industrial by-products as raw materials, and trace components derived from industrial by-products have a significant effect on the quality of cement, and the amount of hexavalent chromium released is also greatly different. .
Patent Document 8 adds a function to remarkably suppress the elution of harmful heavy metals without causing a decrease in strength of the improved treated soil by supporting calcium polysulfide, which is a compound containing Ca and S, on an immobilizing material such as quicklime. The purpose is to provide a ground improvement material. This document discloses a technique of mixing with cement or gypsum after being supported on quicklime which is an immobilizing material.
Patent Document 9 is a Ca 8 S 5 (S 2 O 3) (OH) heavy metal immobilizing agent composed mainly of 12 · 20H 2 O and calcium hydroxide, a commercially available lime sulfur as calcium polysulfide The use is described.
However, in these documents, the effect of lowering the viscosity of the mixed soil is small, and the present invention has been completed with the knowledge that it is possible to impart a high viscosity reducing effect and to suppress the elution amount of hexavalent chromium. .
本発明は、スライム（混合土）の流動化によって施工性が改善するだけでなく、六価クロム溶出量が低減する、地盤安定化用液体混和剤、地盤安定化材料、及び地盤安定化工法を提供する。 The present invention not only improves workability by fluidization of slime (mixed soil), but also reduces the amount of hexavalent chromium elution, a liquid admixture for ground stabilization, a ground stabilization material, and a ground stabilization method. provide.
すなわち、本発明は、（１）ｐＨ１０以上、酸化還元電位（ＯＲＰ）が−４５０ｍｖ以下、ＭｇＯ含有量が０．３％以上の溶液である石灰硫黄合剤を含有してなる地盤安定化用液体混和剤、（２）セメント１００質量部に対して０.０１〜１０質量部使用してなる（１）の地盤安定化用液体混和剤、（３）さらに、ナフタレン類、メラミン類、アミノスルホン酸類、ポリカルボン酸類またはポリエーテル類の中から選ばれた１種または２種の液体減水剤を混合してなる（１）または（２）の地盤安定化用液体混和剤、（４）（１）〜（３）のいずれかの地盤安定化用液体混和剤、水およびセメントを混合してなる地盤安定化用材料。（５）（４）の地盤安定化材料を地盤中に注入し、土と混合して粘性を低下させる地盤安定化工法、である。 That is, the present invention is (1) a ground stabilization liquid comprising a lime sulfur mixture which is a solution having a pH of 10 or more, an oxidation-reduction potential (ORP) of -450 mV or less, and an MgO content of 0.3% or more. (2) Liquid admixture for ground stabilization of (1) using 0.01 to 10 parts by mass with respect to 100 parts by mass of cement, (3) Naphthalenes, melamines, aminosulfonic acids (1) or (2) a liquid admixture for ground stabilization, which comprises mixing one or two liquid water reducing agents selected from polycarboxylic acids or polyethers, (4) (1) A ground stabilization material obtained by mixing the ground stabilization liquid admixture of any of (3), water and cement. (5) A ground stabilization method in which the ground stabilization material of (4) is poured into the ground and mixed with soil to reduce the viscosity.
本発明の地盤安定化用液体混和剤、地盤安定化材料および地盤安定化工法により、スライムの流動化によって施工性が改善するだけでなく、六価クロム溶出量が低減するなどの効果を奏する。 By the liquid stabilizer for ground stabilization, the ground stabilizing material, and the ground stabilization method of the present invention, not only the workability is improved by fluidization of slime, but also the elution amount of hexavalent chromium is reduced.
以下、本発明を詳細に説明する。
本発明で使用する部や％は特に規定のない限り質量基準である。
Hereinafter, the present invention will be described in detail.
Parts and% used in the present invention are based on mass unless otherwise specified.
本発明の石灰硫黄合剤とは、主に果樹の農薬として知られ、生石灰と硫黄と水を原料とし、オートクレーブで反応させて得られる固液分離した黄褐色の液体である。ＣａとＳと水を主成分とし、多硫化カルシウム（ＣａＳＸ）が主であり、Ｔ‐Ｃａ換算で５〜１０％、Ｔ−Ｓ換算で１５〜３０％、ＭｇＯ換算で０．３〜２．０％の範囲でＭｇを含み、ｐＨは１０．０以上である。また、石灰硫黄合剤の酸化還元電位（ＯＲＰ）は特異的で−４５０ｍｖ以下である。 The lime-sulfur mixture of the present invention is a yellow-brown liquid which is known mainly as an agricultural chemical for fruit trees and is obtained by reacting quick lime, sulfur and water as raw materials and reacting them in an autoclave. It is mainly composed of Ca, S, and water, and is mainly calcium polysulfide (CaS x ), 5 to 10% in terms of T-Ca, 15 to 30% in terms of TS, and 0.3 to 2 in terms of MgO. Mg is contained in the range of 0.0%, and the pH is 10.0 or more. The oxidation-reduction potential (ORP) of the lime-sulfur mixture is specific and is -450 mV or less.
本発明の石灰硫黄合剤のｐＨがアルカリ性領域であることは、極めて重要である。ｐＨが１０．０未満では、本発明の効果、すなわち、流動性の向上や六価クロムの還元効果、さらには強度発現性が十分に得られない場合がある。 It is extremely important that the pH of the lime-sulfur mixture of the present invention is in the alkaline region. If the pH is less than 10.0, the effects of the present invention, that is, the improvement in fluidity, the reduction effect of hexavalent chromium, and the strength development may not be sufficiently obtained.
本発明の石灰硫黄合剤の酸化還元電位（ＯＲＰ）が、−４５０ｍｖ以下の範囲にないと、本発明の効果、すなわち、スライムの流動性の向上や六価クロムの還元効果、さらには強度発現性が十分に得られない場合がある。 If the oxidation-reduction potential (ORP) of the lime-sulfur mixture of the present invention is not in the range of −450 mV or less, the effects of the present invention, that is, the improvement of the fluidity of slime, the reduction effect of hexavalent chromium, and further the development of strength. There are cases where sufficient sex cannot be obtained.
本発明の石灰硫黄合剤には、ＭｇＯ換算で０．３〜２．０％の範囲でＭｇが含まれる。Ｍｇの含有量がＭｇＯ換算で０．３％未満であると、本発明の効果、すなわち、流動性の向上や六価クロムの還元効果、さらには強度発現性が十分に得られない場合がある。
The lime-sulfur mixture of the present invention contains Mg in a range of 0.3 to 2.0% in terms of MgO. When the Mg content is less than 0.3% in terms of MgO, the effects of the present invention, that is, the improvement of fluidity, the reduction effect of hexavalent chromium, and the strength development may not be sufficiently obtained. .
本発明の地盤安定化用液体混和剤の使用量は、特に限定されるものではないが、通常、セメント１００部に対して０．０１〜１０部が好ましく、０．１〜５部がより好ましい。地盤安定化用液体混和剤の使用量が少ないと、本発明の効果、すなわち、スライムの流動性の向上や六価クロムの還元効果、さらには強度発現性が十分に得られない場合がある。 Although the usage-amount of the liquid stabilizer for ground stabilization of this invention is not specifically limited, Usually, 0.01-10 parts are preferable with respect to 100 parts of cement, and 0.1-5 parts are more preferable. . If the amount of the ground stabilization liquid admixture used is small, the effects of the present invention, that is, the improvement of the fluidity of slime, the reduction effect of hexavalent chromium, and the strength development may not be sufficiently obtained.
本発明の地盤安定化用液体混和剤に、ナフタレン類、メラミン類、アミノスルホン酸類、ポリカルボン酸類またはポリエーテル類からなる１種または２種の液体減水剤を併用することでさらなる流動性の向上を図ることができる。
ナフタレン類、メラミン類、アミノスルホン酸類、ポリカルボン酸類またはポリエーテル類としては、分子量や重合度など特に限定されるものではない。
さらに、スライムの粘性を低下させるものとしてリン酸塩、アルカリ金属炭酸塩、オキシカルボン酸類があり、これらを併用することも可能である。
Further improvement of fluidity by using one or two liquid water reducing agents composed of naphthalenes, melamines, aminosulfonic acids, polycarboxylic acids or polyethers in combination with the liquid admixture for ground stabilization of the present invention. Can be achieved.
Naphthalenes, melamines, aminosulfonic acids, polycarboxylic acids or polyethers are not particularly limited in terms of molecular weight and degree of polymerization.
Furthermore, there are phosphates, alkali metal carbonates, and oxycarboxylic acids that reduce the viscosity of the slime, and these can be used in combination.
本発明の地盤安定化用液体混和剤は、本液体混和剤とセメントと水とを混合して地盤安定化材料を調製する。
本発明で使用するセメントとしては、普通、早強、超早強、低熱、および中庸熱などの各種ポルトランドセメントや、これらポルトランドセメントに、高炉スラグ、フライアッシュまたはシリカを混合した各種混合セメント、石灰石粉末や高炉徐冷スラグ微粉末などを混合したフィラーセメント、ならびに、都市ゴミ焼却灰や下水汚泥焼却灰を原料として製造された環境調和型セメント（エコセメント）などのポルトランドセメント、ならびに、市販されている微粒子セメントなどが挙げられ、これらのうちの一種または二種以上が使用可能である。また、通常セメントに使用されている成分（例えば石膏など）量を増減して調整されたものも使用可能である。
The liquid admixture for ground stabilization of the present invention is prepared by mixing the liquid admixture, cement, and water.
As the cement used in the present invention, various portland cements such as normal, early strength, super early strength, low heat, and moderate heat, various mixed cements obtained by mixing blast furnace slag, fly ash or silica with these portland cements, limestone filler cements such as a mixture of powder and slowly cooled blast furnace slag, and Portland cement, such as municipal waste incineration ash and sewage sludge incineration ash to be produced as a raw material environment friendly cement (Ecocement), as well, it is commercially available and such fine cement can be mentioned are, one or two or more of these can be used. It also can be used and then adjusted normal components (such as gypsum), which is used in the cement amount to increase or decrease.
本発明で使用する水の使用量は、土の含水比等で異なり、特に限定されるものではないが、通常、セメント１００部に対して、３０〜５００部が好ましく、５０〜３００部がより好ましい。３０部未満ではスライムの流動性が小さく、５００部を超えると強度発現性を阻害する場合がある。
本発明の地盤安定化用液体混和剤は、粘性土に限らず、砂質土や腐食土等の土に対しても優れた効果がある。
The amount of water used in the present invention varies depending on the moisture content of the soil and is not particularly limited, but is usually preferably 30 to 500 parts, more preferably 50 to 300 parts, relative to 100 parts of cement. preferable. If it is less than 30 parts, the fluidity of the slime is small, and if it exceeds 500 parts, strength development may be inhibited.
The liquid admixture for ground stabilization of the present invention is not limited to viscous soil, and has an excellent effect on soil such as sandy soil and corroded soil.
この地盤を安定化させる方法の例として、例えば、セメントミルクを、高圧で地中深くに噴射し、土と混合して硬化させ安定化する工法が挙げられ、この方法について以下に記する。
この工法は、地中にセメントミルクを噴射する管を挿入し、管を回転させながら管先端付近からセメントミルクを高圧噴射し、地中の土を切削すると同時に、切削された土とセメントミルクとが混合された混合土を別の管内を通して地上へ排出しながら、一定速度で管を上昇させ、地中を、セメントミルクと土との混合物で置換して硬化させ、地盤を安定化させる工法である。
本発明の混合や攪拌の条件は、地中に高圧噴射する前に本液体混和剤と水とが混合されていれば特に限定するものではないが、本液体混和剤と水とを、回転数１０〜１０００rpm 程度で回転するグラウトミキサーにより混合するバッチ混合方式や、管内に羽根を設置しているラインミキサーにより混合する連続混合方式等により混合や攪拌が可能である。
As an example of a method for stabilizing the ground, for example, there is a construction method in which cement milk is sprayed deeply into the ground at a high pressure, mixed with soil, hardened and stabilized, and this method will be described below.
This method inserts a pipe that injects cement milk into the ground, and rotates the pipe to inject high pressure cement milk from the vicinity of the tip of the pipe to cut the soil in the ground. At the same time, the cut soil and cement milk In this construction method, the mixed soil mixed with is discharged to the ground through another pipe, the pipe is raised at a constant speed, and the ground is replaced with a mixture of cement milk and soil to harden and stabilize the ground. is there.
The mixing and stirring conditions of the present invention are not particularly limited as long as the liquid admixture and water are mixed before high-pressure jetting into the ground. Mixing and stirring can be performed by a batch mixing method in which mixing is performed by a grout mixer rotating at about 10 to 1000 rpm, a continuous mixing method in which mixing is performed by a line mixer in which blades are installed in the pipe, and the like.
次に、本発明の地盤安定化工法について説明する。
まず、地盤改良が必要な箇所を削孔する。削孔径は特に限定されるものではないが注入ロッドが挿入できる大きさであればよい。
削孔の深さは、改良したい領域により変更し特に限定することはできないが、10〜50ｍ程度が通常である。
次に、二重管や三重管構造の注入ロッドを挿入し、セメントスラリーをグラウトポンプ、超高圧ポンプ、又はコンプレッサーなどを用いて圧送し、二重管または三重管のノズルから噴射する。
セメントミルクの圧送圧力は大きい方が好ましいが、二重管、三重管、またはこれらのノズルの磨耗等を考慮すると５０〜７００kg/cm2程度が通常である。
セメントミルクの送液量は特に限定されるものではないが、３０〜８００リットル／分程度が好ましい。
このように地中で高圧噴射されたセメントスラリーは、土と一緒に混合攪拌され、また、注入ロッドは回転しながら一定速度で地上へ上昇するので、最終的にはセメントスラリーと土とからなる円柱状の杭が地中に形成される。
この杭の直径は、地盤の硬さを示すＮ値等の土の条件や噴射の圧送圧力等の施工条件により変化し、特に限定されるものではないが、０.５〜２０ｍが適当である。杭の長さは３m〜５０m程度のものが形成可能である。
Next, the ground stabilization method of the present invention will be described.
First, drill a hole that requires ground improvement. The diameter of the drilling hole is not particularly limited as long as the injection rod can be inserted.
The depth of the drilling hole can be changed depending on the region to be improved and is not particularly limited, but is usually about 10 to 50 m.
Next, an injection rod having a double tube or triple tube structure is inserted, and the cement slurry is pumped using a grout pump, an ultrahigh pressure pump, a compressor, or the like, and injected from a nozzle of the double tube or triple tube.
A larger pumping pressure of cement milk is preferable, but it is usually about 50 to 700 kg / cm 2 in consideration of wear of a double pipe, a triple pipe, or nozzles thereof.
The amount of cement milk fed is not particularly limited, but is preferably about 30 to 800 liters / minute.
The cement slurry thus jetted at high pressure in the ground is mixed and stirred together with the soil, and since the injection rod rises to the ground at a constant speed while rotating, it finally consists of cement slurry and soil. A columnar pile is formed in the ground.
The diameter of this pile varies depending on soil conditions such as N value indicating the hardness of the ground and construction conditions such as injection pressure, and is not particularly limited, but 0.5 to 20 m is appropriate. . The pile can be 3m to 50m long.
以下、実験例を挙げてさらに詳細に内容を説明するが、本発明はこれらに限定されるものではない。 Hereinafter, although an example is given and the content is demonstrated in detail, this invention is not limited to these.
「実験例１」
セメント１００部に対して水１５０部、Ａ〜Ｋに調製した地盤安定化用液体混和剤をセメント１００部に対して２部混合してセメントスラリーを作製する。地盤安定化用液体混和剤ＧとＨはセメント１００部に対して４部混合してセメントスラリーを作製した。そのセメントスラリー０．５リットルに対して以下に示す土１リットルをモルタルミキサで低速１分間混合して得られたスライムの粘度、六価クロム溶出量、圧縮強度を測定した。
"Experiment 1"
150 parts of water is mixed with 100 parts of cement, and 2 parts of the liquid stabilizer for ground stabilization prepared in A to K is mixed with 100 parts of cement to prepare a cement slurry. 4 parts of liquid stabilizer G and H for ground stabilization were mixed with 100 parts of cement to prepare a cement slurry. The viscosity, the elution amount of hexavalent chromium, and the compressive strength of slime obtained by mixing 1 liter of soil shown below with 0.5 liter of the cement slurry with a mortar mixer for 1 minute at low speed were measured.
「使用材料」
土：東京都町田市産粘性土、密度１.４７ｇ/ ｃｍ3、含水比８５％
セメント：普通ポルトランドセメント、市販品
地盤安定化用液体混和剤として以下の溶液を使用した。
地盤安定化用液体混和剤Ａ：石灰硫黄合剤、ｐＨが１１．０、酸化還元電位−５４０ｍｖ、ＭｇＯ含有量が１．０％、Ｔ‐Ｃａ量１３％、Ｔ−Ｓ量２６％。
地盤安定化用液体混和剤Ｂ：石灰硫黄合剤、ｐＨが１０．５、酸化還元電位−５００ｍｖ、ＭｇＯ含有量が１．０％、Ｔ‐Ｃａ量１２％、Ｔ−Ｓ量２４％。
地盤安定化用液体混和剤Ｃ：石灰硫黄合剤、ｐＨが１０．０、酸化還元電位−４５０ｍｖ、ＭｇＯ含有量が１．０％、Ｔ‐Ｃａ量１１％、Ｔ−Ｓ量２２％。
地盤安定化用液体混和剤Ｄ：石灰硫黄合剤、ｐＨが１０．５、酸化還元電位−５００ｍｖ、ＭｇＯ含有量が０．５％。Ｔ‐Ｃａ量１０％、Ｔ−Ｓ量２１％。
地盤安定化用液体混和剤Ｅ：石灰硫黄合剤、ｐＨが１０．５、酸化還元電位−５００ｍｖ、ＭｇＯ含有量が２．０％、Ｔ‐Ｃａ量８％、Ｔ−Ｓ量１９％。
地盤安定化用液体混和剤Ｆ：石灰硫黄合剤、ｐＨが１１．０、酸化還元電位−５４０ｍｖ、ＭｇＯ含有量が１．０％、Ｔ‐Ｃａ量１３％、Ｔ−Ｓ量２６％。
地盤安定化用液体混和剤Ｇ：ナフタレンスルホン酸塩系減水剤、電気化学工業社製、商品名「ＦＴ−５００Ｖ」、ナフタレンスルホン酸含有率４０％
地盤安定化用液体混和剤Ｈ：ポリカルボン酸塩系減水剤、花王社製、商品名「マイティ２１Ｐ」
地盤安定化用液体混和剤Ｉ：地盤安定化用液体混和剤ＡとＧを同量混合したもの
地盤安定化用液体混和剤J：地盤安定化用液体混和剤ＡとＨを同量混合したもの
地盤安定化用液体混和剤Ｋ：地盤安定化用液体混和剤Ｉを７０％にトリポリリン酸ナトリウム、炭酸ナトリウム、クエン酸ナトリウムを１０％ずつ混合したもの
"Materials used"
Soil: Cohesive soil from Machida city, Tokyo, density 1.47g / cm 3 , moisture content 85%
Cement: Ordinary Portland cement, commercially available product The following solutions were used as liquid admixtures for ground stabilization.
Ground admixture liquid admixture A: lime sulfur mixture, pH 11.0, oxidation-reduction potential -540 mV, MgO content 1.0%, T-Ca content 13%, TS content 26%.
Ground stabilization liquid admixture B: Lime sulfur mixture, pH 10.5, oxidation-reduction potential -500 mV, MgO content 1.0%, T-Ca content 12%, TS content 24%.
Ground admixture liquid admixture C: lime sulfur mixture, pH 10.0, redox potential -450 mV, MgO content 1.0%, T-Ca content 11%, TS content 22%.
Liquid admixture D for ground stabilization: lime sulfur mixture, pH is 10.5, oxidation-reduction potential -500 mV, MgO content is 0.5%. T-Ca amount 10%, T-S amount 21%.
Ground admixture liquid admixture E: lime sulfur mixture, pH 10.5, oxidation-reduction potential -500 mV, MgO content 2.0%, T-Ca content 8%, TS content 19%.
Ground stabilization liquid admixture F: lime sulfur mixture, pH 11.0, oxidation-reduction potential -540 mv, MgO content 1.0%, T-Ca content 13%, TS content 26%.
Ground stabilization liquid admixture G: Naphthalenesulfonate-based water reducing agent, manufactured by Denki Kagaku Kogyo Co., Ltd., trade name “FT-500V”, naphthalenesulfonic acid content 40%
Ground stabilization liquid admixture H: Polycarboxylate-based water reducing agent, manufactured by Kao Corporation, trade name “Mighty 21P”
Soil stabilization liquid admixture I: Ground stabilization liquid admixture A and G mixed in the same amount Ground stabilization liquid admixture J: Ground stabilization liquid admixture A and H in the same amount Ground stabilization liquid admixture K: 70% of ground stabilization liquid admixture I mixed with 10% each of sodium tripolyphosphate, sodium carbonate and sodium citrate
「試験方法」
粘度：混合したスライムの直後と３０分後の粘度をＢ型粘度計で測定
六価クロム溶出量：混合した排泥をφ５×１０ｃｍの型枠に詰めて、水が飛ばないようにビニール袋で封緘にして２０℃で材齢７日まで養生する。その後、環境庁台４６号法に従って測定
圧縮強度：混合した排泥をφ５×１０ｃｍの型枠に詰めて、水が飛ばないようにビニール袋で封緘にして２０℃で材齢２８日まで養生後に耐圧試験機にて測定
"Test method"
Viscosity: Measure the viscosity immediately after mixed slime and 30 minutes later with a B-type viscometer. Hexavalent chromium elution amount: Pack the mixed sludge in a 5 × 10 cm mold and use a plastic bag to prevent water from flying. Seal and cure at 20 ° C. until age 7 days. After that, measured according to the Environment Agency stand No. 46 method Compressive strength: After filling the mixed waste mud in a φ5 × 10cm formwork, sealed in a plastic bag so that water does not fly, and after curing at 20 ° C until the age of 28 days Measured with a pressure tester
表１より、本発明の地盤安定化用液体混和剤を使用することで、スライムの粘性を低減させ、六価クロム溶出量を減らしながら、さらに強度性状が良好であることが分かる。 From Table 1, it can be seen that by using the liquid stabilizer for ground stabilization of the present invention, the slime viscosity is reduced, and the hexavalent chromium elution amount is reduced, and the strength property is further improved.
「実験例２」
本発明の地盤安定化用液体混和剤Ａを使用し、使用量を表２に示すように変化したこと以外は実験例１と同様に行った。結果を表２に示す。
"Experimental example 2"
The same operation as in Experimental Example 1 was conducted except that the ground stabilization liquid admixture A of the present invention was used and the amount used was changed as shown in Table 2. The results are shown in Table 2.
表２より、本発明の地盤安定化用液体混和剤を使用することにより、スライムの粘度が低減し、六価クロム溶出量を減らしながら、さらに強度性状が良好であることが分かる。 From Table 2, it can be seen that by using the liquid stabilizer for ground stabilization of the present invention, the viscosity of the slime is reduced, and the strength property is further improved while the amount of elution of hexavalent chromium is reduced.
本発明の地盤安定化用液体混和剤、地盤安定化材料および地盤安定化工法により、スライムの流動化によって施工性が改善するだけでなく、六価クロム溶出量が低減するので、環境に配慮した材料を提供することが可能となり、土木、建築分野に好適である。 The liquid admixture for ground stabilization, ground stabilization material, and ground stabilization method of the present invention not only improve workability by fluidization of slime, but also reduce the elution amount of hexavalent chromium, so it is environmentally friendly. Materials can be provided, which is suitable for the civil engineering and construction fields.
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