JP2000109830A - Solidifying material for moisture-containing soil and improvement of solidification of moisture-containing soil - Google Patents
Solidifying material for moisture-containing soil and improvement of solidification of moisture-containing soilInfo
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- JP2000109830A JP2000109830A JP10279634A JP27963498A JP2000109830A JP 2000109830 A JP2000109830 A JP 2000109830A JP 10279634 A JP10279634 A JP 10279634A JP 27963498 A JP27963498 A JP 27963498A JP 2000109830 A JP2000109830 A JP 2000109830A
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- Prior art keywords
- soil
- moisture
- solidification
- pts
- solidifying material
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、含水土壌の固化材
及びそれを使用する含水土壌の固化改良方法に関する。[0001] The present invention relates to a solidifying material for hydrous soil and a method for improving solidification of hydrous soil using the same.
【０００２】[0002]
【従来の技術】軟弱土壌の土質改良には、固化材を使用
する固化処理が施される。また、軟弱土壌地域の改良利
用ではなく、その地域の土木工事等に伴って発生する含
水残土を搬出する場合にも、流動性が高いことからその
ままでの搬送が困難であり、固化材を使用して固化処理
を施した後、搬出する必要がある。何れの目的において
も、固化材には、固化後の土壌が目的に合った十分な強
度を有していること、適度の固化速度を有しているこ
と、固化材が化学的に安定であり有害物質が溶出しない
こと等の特性が要求されるが、これ等複数機能を要求さ
れる固化材として既に多くの技術が開示されている。こ
れ等は、含まれる水硬性成分の種によってセメント系と
せっこう系に大別できるが、せっこう系はアルカリ溶出
によるアルカリ公害を引き起こす可能性は低いものの、
固化後土壌に十分な強度を付与できるものが得られてい
ない。2. Description of the Related Art To improve the soil quality of soft soil, a solidification treatment using a solidifying material is performed. In addition, when carrying out hydrous residual soil generated due to civil engineering work in that area, instead of using it in soft soil areas, it is difficult to transport it as it is because of its high fluidity. After solidification treatment, it is necessary to carry it out. For any purpose, the solidified material must be such that the soil after solidification has sufficient strength for the purpose, has an appropriate solidification rate, and the solidified material is chemically stable. Although properties such as harmful substances are not required to be eluted, many techniques have already been disclosed as a solidifying material that requires a plurality of functions. These can be broadly classified into cement-based and gypsum-based, depending on the type of hydraulic component included, although gypsum-based systems are unlikely to cause alkali pollution due to alkali elution,
What has not been able to give sufficient strength to the soil after solidification has not been obtained.
【０００３】一方、セメント系固化材は，セメント自体
が強アルカリであるためアルカリ公害を引き起こす可能
性があるものの、固化後土壌は強度的に問題が無いこと
から、強度面を活かしつつアルカリ公害を抑制する試み
が数多く為されている。これ等は、対象土壌、固化材添
加量、評価方法等が夫々異なるため、固化材としての比
較評価は出来ないが、固化材については更なる改良が要
求されていることは事実であり、また、徒に強度向上を
図るのでなく、改良後土壌の使用目的に応じて調製され
た固化材が要求されている。[0003] On the other hand, cement-based solidified materials may cause alkaline pollution because the cement itself is a strong alkali, but since the soil after solidification has no problem in strength, it is possible to reduce alkali pollution while taking advantage of strength. Many attempts have been made to suppress it. This is because the target soil, the amount of solidified material added, the evaluation method, etc. are different from each other, so it is not possible to compare and evaluate as a solidified material, but it is true that further improvement is required for the solidified material, However, there is a demand for a solidified material prepared according to the purpose of use of the soil after the improvement, without increasing the strength.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、含水土壌の
固化改良に優れた性能を示す固化材の提供を目的とす
る。具体的には、ｐＨ値が、土壌の緩衝能力によるｐＨ
値降下が比較的速やかに起こる１０以下の範囲であり、
且つ、７日後の一軸圧縮強度が、人が上を歩ける尺度で
ある０．５ｋｇｆ／ｃｍ2以上である改良土壌を与える
固化材の提供、及び、該固化材を使用する含水土壌の固
化改良方法の提供を目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a solidified material which exhibits excellent performance in improving solidification of hydrous soil. Specifically, the pH value is determined by the pH due to the buffer capacity of the soil.
The range of 10 or less at which the value drop occurs relatively quickly,
In addition, the present invention provides a solidified material that gives improved soil whose uniaxial compressive strength after 7 days is 0.5 kgf / cm 2 or more, which is a measure that allows a person to walk on the ground, and a method for improving solidification of hydrous soil using the solidified material. The purpose is to provide.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、特定の割
合の酸化マグネシウムと、硫酸アルミニウム及び／又は
硫酸鉄とから成る組成物が、上記目的とする固化材とな
ることを見出し、本発明を完成した。すなわち、本発明
は、１０〜５０重量部の硫酸アルミニウム及び／または
硫酸鉄と、残部が酸化マグネシウムより成る組成物を必
須成分とする、含水土壌用固化材に関する。更に、本発
明は、上記含水土壌用固化材を、含水土壌１ｍ3当たり
５０〜４００ｋｇ添加する、含水土壌の固化改良方法に
関する。以下に、本発明を説明する。Means for Solving the Problems The present inventors have found that a composition comprising a specified ratio of magnesium oxide and aluminum sulfate and / or iron sulfate is to be the above-described solidified material, and Completed the invention. That is, the present invention relates to a solidifying material for hydrous soil, which comprises, as essential components, a composition consisting of 10 to 50 parts by weight of aluminum sulfate and / or iron sulfate and the balance being magnesium oxide. Further, the present invention relates to a method for improving solidification of hydrous soil, wherein the solidifying material for hydrous soil is added in an amount of 50 to 400 kg per 1 m 3 of hydrous soil. Hereinafter, the present invention will be described.
【０００６】[0006]
【発明の実施の形態】酸化マグネシウムが水和反応で固
化することは知られているが、本発明では、その特性を
利用すべく、酸化マグネシウムを水硬性材料として使用
することを特徴としている。DESCRIPTION OF THE PREFERRED EMBODIMENTS It is known that magnesium oxide solidifies by a hydration reaction, but the present invention is characterized by using magnesium oxide as a hydraulic material in order to utilize its properties.
【０００７】酸化マグネシウムは、カ焼温度により軽焼
マグネシアと硬焼マグネシアの２種に大別できるが、本
発明においては、軽焼マグネシアを使用するのが好まし
い。硬焼マグネシアは水和活性に乏しいことから、固化
材の水硬性成分として使用した場合には、目的強度への
到達に長時間要することになるからである。[0007] Magnesium oxide can be roughly classified into two types, light-burned magnesia and hard-burned magnesia, depending on the calcination temperature. In the present invention, light-burned magnesia is preferably used. This is because hard-burned magnesia has poor hydration activity, and when used as a hydraulic component of a solidified material, it takes a long time to reach the target strength.
【０００８】酸化マグネシウムの水和により水酸化マグ
ネシウムが生成するが、水酸化マグネシウムの溶解度
は、アルカリ土類金属水酸化物としては比較的低いこと
から、飽和水溶液のｐＨは１０．５程度であり、セメン
トに比べて低いものの、固化材の主構成成分として使用
するに当っては、ｐＨ調整が必要であることには変わり
がない。本発明では、硫酸アルミニウム又は硫酸鉄を中
和剤として使用する。中和剤として添加される硫酸アル
ミニウム、又は、硫酸第一鉄又は硫酸第二鉄の形態の硫
酸鉄は何れも、安価で且つ入手が容易な材料であり、中
和剤として性能的に問題はないが、硫酸アルミニウムの
使用が効果の点で好ましい。これ等は夫々単独で、また
は、硫酸塩混合物として添加する事が出来る。Magnesium hydroxide is formed by hydration of magnesium oxide. However, since the solubility of magnesium hydroxide is relatively low as an alkaline earth metal hydroxide, the pH of a saturated aqueous solution is about 10.5. Although it is lower than cement, it still requires pH adjustment when used as a main component of the solidifying material. In the present invention, aluminum sulfate or iron sulfate is used as a neutralizing agent. Aluminum sulfate added as a neutralizing agent, or iron sulfate in the form of ferrous sulfate or ferric sulfate are all inexpensive and easily available materials, and there is no problem in performance as a neutralizing agent. However, the use of aluminum sulfate is preferred in terms of effect. These can be added alone or as a mixture of sulfates.
【０００９】一般にセメント系固化材は中和により固化
体の強度は急激に低下する。本発明においても、中和剤
である硫酸アルミニウム、硫酸鉄の添加により固化後土
壌の一軸圧縮強度の低下が認められるが、その程度は他
の中和剤添加に比して小さい。特に、硫酸アルミニウム
の場合には、酸化マグネシウム水和物と硫酸アルミニウ
ムにから形成される盤状の固化組織によりカードハウス
構造をとることから、中和による強度低下が抑えられ、
より好ましい結果を与える。しかし、中和剤の添加によ
る強度低下は不可避であることから、本発明において
は、必須成分中における硫酸アルミニウム、硫酸鉄、ま
たはこれ等の混合物の存在量が１０〜５０重量部である
ようにすることにより、強度及びｐＨ値を満足する改良
土壌を与える固化材を得る事が出来る。In general, the strength of a solidified cement-based solidified material is rapidly reduced by neutralization. In the present invention as well, a decrease in the uniaxial compressive strength of the soil after solidification due to the addition of the neutralizing agents aluminum sulfate and iron sulfate is observed, but the degree thereof is smaller than that of the other neutralizing agents. In particular, in the case of aluminum sulfate, since a card house structure is formed by a disk-shaped solidified structure formed from magnesium oxide hydrate and aluminum sulfate, a decrease in strength due to neutralization is suppressed,
Gives more favorable results. However, since a reduction in strength due to the addition of the neutralizing agent is inevitable, in the present invention, the amount of aluminum sulfate, iron sulfate, or a mixture thereof in the essential components is 10 to 50 parts by weight. By doing so, it is possible to obtain a solidified material that gives improved soil satisfying the strength and the pH value.
【００１０】本発明の固化材は、必須成分である酸化マ
グネシウム、硫酸アルミニウム及び／又は硫酸鉄を適量
混合することにより十分その性能を発揮するが、更に無
機多孔体吸水材及び／又は吸水性有機物を添加すること
により、固化材添加後土壌のｐＨ値を殆ど変動させるこ
となく、固化改良後土壌の一軸圧縮強度を更に改善する
ことが出来る。吸水材は、土壌中に存在する自由水と結
合・固定化して、含まれる自由水量を少なくする働きを
有していることから、吸水材を添加した固化材の使用
は、含水比の低い含水土壌の固化改良と同じになり、固
化材添加後土壌の一軸圧縮強度が高くなるものと考えら
れる。従って、含水比の高い土壌の固化改良において
は、吸水材の添加は特に効果的である。[0010] The solidifying material of the present invention exhibits its performance sufficiently by mixing an essential component of magnesium oxide, aluminum sulfate and / or iron sulfate in an appropriate amount, but furthermore, an inorganic porous water absorbing material and / or a water absorbing organic material. By adding, the uniaxial compressive strength of the soil after solidification improvement can be further improved without substantially changing the pH value of the soil after addition of the solidifying agent. Since the water-absorbing material has the function of binding and fixing to the free water present in the soil to reduce the amount of free water contained therein, the use of the solidified material to which the water-absorbing material is added has a low water content. This is considered to be the same as the improvement of soil solidification, and the unconfined compressive strength of the soil increases after the addition of the solidifying agent. Therefore, the addition of a water absorbing material is particularly effective in improving the solidification of soil having a high water content.
【００１１】本発明で使用可能な吸水性有機物の例とし
ては、ポリアクリルアミド、ポリメタクリルアミド、ポ
リビニールアルコール、ポリアクリレート等の合成高分
子、及び、故紙、パルプ等の天然有機高分子が挙げられ
るが、中でもシュレッダー等の適当な手段で幅数ｍｍ×
長さ数十ｍｍに裁断した故紙の添加は、性能的にも価格
的にも優れた、好ましい固化材を与える。Examples of the water-absorbing organic substance usable in the present invention include synthetic polymers such as polyacrylamide, polymethacrylamide, polyvinyl alcohol, and polyacrylate, and natural organic polymers such as waste paper and pulp. However, the width is several mm by appropriate means such as a shredder.
The addition of waste paper cut to a length of several tens of mm gives a preferable solidified material excellent in performance and cost.
【００１２】一方、本発明で使用可能な無機多孔体吸水
材例としては、パーライト、ゼオライト、シリカ、ボト
ムアッシュ等を挙げることが出来るが、中でもパーライ
トが、吸水性能、化学的安定性、価格面で最も好ましい
材料である。On the other hand, examples of the inorganic porous water-absorbing material usable in the present invention include pearlite, zeolite, silica, bottom ash and the like. Is the most preferred material.
【００１３】固化材必須成分１００重量部当たりの吸水
材の添加量は、合成有機高分子の場合には０．１〜５重
量部、故紙等の天然有機高分子及び無機質多孔体の場合
には５〜６０重量部とするのが良い。有機系、無機系何
れにおいても、夫々の範囲より少ないと添加効果が十分
に発現せず、逆に多いと経済的でなくなるか、固化改良
後土壌の圧縮強度の低下を招くことがある。圧縮強度面
での固化材の改良は、固化改良に必要な固化材量の低減
に繋がることから、固化材への吸水材の添加量は、改良
対象土の含水比、及び、目的強度を達成するのに必要な
固化材の必要量とを勘案して適宜決めることになる。The amount of the water-absorbing material added per 100 parts by weight of the solidifying material essential component is 0.1 to 5 parts by weight in the case of a synthetic organic polymer, and in the case of a natural organic polymer such as waste paper and an inorganic porous material. The content is preferably 5 to 60 parts by weight. In both organic and inorganic systems, if the amount is less than the respective ranges, the effect of addition may not be sufficiently exhibited, while if the amount is too large, it may not be economical or the compressive strength of the soil after solidification improvement may be reduced. Since the improvement of the solidified material in terms of compressive strength leads to a reduction in the amount of solidified material required for solidification improvement, the amount of water-absorbing material added to the solidified material achieves the water content ratio of the soil to be improved and the target strength It is determined appropriately in consideration of the necessary amount of the solidifying material necessary to perform the heat treatment.
【００１４】本発明の固化材は、構成各成分の単なる混
合物であることから、その調製に当っては特別な機器、
手段を必要とせず、ミキサー等公知の固体混合用の機器
を使った公知の方法が適用出来る。Since the solidifying material of the present invention is a mere mixture of the constituent components, special equipment is required for its preparation.
No means is required, and a known method using a known solid mixing device such as a mixer can be applied.
【００１５】本発明の固化材を使用して含水土壌の改良
を行うに当っては、土壌に余分な水を加えない点で、固
体状態で混合するのが好ましい。その際、一般に行われ
ている、対象土壌とミキサーを用いて混合するミキサー
混合法や、スタビライザーを用いる浅層処理法が効果的
に使用できる。また、含水土壌への添加量は、含水土壌
の特性、特に含水量によるが、含水土壌１ｍ3当たり５
０〜４００ｋｇ添加することにより、目的とする材令７
日後の０．５ｋｇｆ／ｃｍ2以上の一軸圧縮強度を有す
る改良土壌を得ることが出来る。勿論、必要に応じて固
化材添加量を増やすことにより、ｐＨ値の大きな上昇を
招くこと無く土壌一軸圧縮強度を更に高めることも可能
であり、目的、経済性に合わせて添加量を適宜選択する
ことになる。以下では、具体的例を挙げて、本発明を更
に詳しく説明する。In the improvement of hydrous soil using the solidifying material of the present invention, it is preferable to mix in a solid state in that no extra water is added to the soil. At that time, a mixer mixing method of mixing with a target soil using a mixer and a shallow layer treatment method using a stabilizer can be effectively used. The amount of the water-containing soil, the characteristics of the water-containing soil, especially by water content, water content soil 1 m 3 per 5
By adding 0 to 400 kg, the desired material age 7
An improved soil having a uniaxial compressive strength of 0.5 kgf / cm 2 or more after one day can be obtained. Needless to say, by increasing the amount of the solidifying material added as necessary, it is possible to further increase the uniaxial compressive strength of the soil without causing a large increase in the pH value, and the amount to be added is appropriately selected according to the purpose and economy. Will be. Hereinafter, the present invention will be described in more detail with reference to specific examples.
【００１６】[0016]
（１）使用原料 酸化マグネシウム：試薬１級、市販品 硫酸アルミニウム：無水物、市販品 炭酸リチウム ：二水塩、市販品 故紙 ：シュレッダー裁断屑、幅約５ｍｍ×
長さ約２０ｍｍ パーライト ：粒径：１．２ｍｍ以下、単位容積質
量：０．２０ｋｇ／ｌ、市販品(1) Raw materials used Magnesium oxide: First grade reagent, commercial product Aluminum sulfate: anhydrous, commercial product Lithium carbonate: dihydrate, commercial product Waste paper: shredder cutting waste, width about 5 mm x
Approximately 20mm in length Perlite: particle size: 1.2mm or less, unit mass: 0.20kg / l, commercial product
【００１７】（２）固化材の調製 所定量の酸化マグネシウム及び硫酸アルミニウム、更に
必要に応じて、故紙裁断屑又はパーライトを添加したも
のをホバートミキサーで３分間混合して固化材を得た。(2) Preparation of Solidified Material A predetermined amount of magnesium oxide and aluminum sulfate, and if necessary, waste paper cuttings or pearlite added thereto were mixed with a Hobart mixer for 3 minutes to obtain a solidified material.
【００１８】（３）土壌の改良 処理対象とした土壌は、含水比１９８％、密度１．２２
１ｇ／ｃｍ3のへドロである。上記（２）で調製した固
化材を、処理対象土壌１ｍ3当たり１００ｋｇの割合で
添加した後、ホバート型ミキサーで３分間混合して改良
土壌を調製した。混合後の土壌を、直径５ｃｍ、高さ１
０ｃｍの鋼製の円筒型のモールドに充填し、温度２０
℃、相対湿度９６％の恒温恒湿槽内で７日間養生した後
脱形し、評価用供試体を得た。(3) Improvement of soil The soil to be treated had a water content of 198% and a density of 1.22.
It is a sludge of 1 g / cm 3 . The solidified material prepared in the above (2) was added at a rate of 100 kg per 1 m 3 of the soil to be treated, and then mixed with a Hobart mixer for 3 minutes to prepare an improved soil. The mixed soil is 5cm in diameter and 1 height.
Filled into a 0 cm steel cylindrical mold, temperature 20
After curing for 7 days in a thermo-hygrostat at 96 ° C. and a relative humidity of 96%, the specimen was demolded to obtain a test specimen for evaluation.
【００１９】（４）改良後土壌の評価：一軸圧縮強度 上記（３）で得られた供試体について、ＪＩＳ Ａ１２
１６に則った方法でその一軸圧縮強度を測定した。尚、
一軸圧縮強度については、対象土壌１ｍ3当たり１００
ｋｇの添加で、材令７日後に、人が上を歩くことが可能
な強度である０．５ｋｇｆ／ｃｍ2以上の一軸圧縮強度
を有す改良土壌を与えるものを良とした。(4) Evaluation of soil after improvement: unconfined compressive strength The specimen obtained in (3) above was subjected to JIS A12
The unconfined compressive strength was measured by a method according to No. 16. still,
For uniaxial compressive strength, the target soil 1m 3 per 100
The addition of kg gave good soil having an unconfined compressive strength of 0.5 kgf / cm 2 or more, which is a strength that allows a person to walk on after 7 days of age.
【００２０】（５）改良後土壌の評価：ｐＨ測定 上記（３）で得られた成形前の土壌について、土質工学
会基準ＪＳＦＴ ２１１−１９９０に則り、改良土壌の
ｐＨを測定した。ｐＨ値については、１０以下のものを
良とした。(5) Evaluation of the soil after improvement: pH measurement The soil before molding obtained in the above (3) was measured for the pH of the improved soil in accordance with the Japan Society of Geotechnical Engineers, JSFT 211-1990. Regarding the pH value, those having a pH of 10 or less were regarded as good.
【００２１】実施例１〜５及び比較例１〜３ 酸化マグネシウム及び硫酸アルミニウム添加量を変えた
結果を表１に示す。本発明の範囲に含まれる組成を有す
る固化材を用いた場合、固化改良後土壌のｐＨ値は１０
以下であり、且つ、材令７日における一軸圧縮強度は
０．５ｋｇｆ／ｃｍ2以上であり、目的とした基準をク
リアしていた。それに対して、本発明の範囲を外れた組
成を有する固化材では、固化改良後土壌のｐＨ値又は一
軸圧縮強度が目的とした基準に達せず、固化材としては
不適であることが分かる。Examples 1 to 5 and Comparative Examples 1 to 3 Table 1 shows the results obtained by changing the amounts of magnesium oxide and aluminum sulfate. When a solidified material having a composition falling within the scope of the present invention is used, the pH value of the soil after solidification improvement is 10
The unconfined compressive strength at the age of 7 days or more was 0.5 kgf / cm 2 or more, which satisfied the target standard. On the other hand, in the case of a solidified material having a composition outside the range of the present invention, the pH value or the unconfined compressive strength of the soil after solidification improvement does not reach the intended standard, which indicates that it is unsuitable as a solidified material.
【００２２】[0022]
【表１】 [Table 1]
【００２３】実施例６〜９ ここでは、酸化マグネシウム及び硫酸アルミニウムより
成る組成物に、更に、故紙又はパーライトを吸水材とし
て添加した例を示す。結果を表２に示すが、吸水材の添
加で、材令７日における一軸圧縮強度が向上しているこ
とが分かる。Examples 6 to 9 Here, examples are shown in which waste paper or perlite is further added as a water absorbing material to a composition comprising magnesium oxide and aluminum sulfate. The results are shown in Table 2, and it can be seen that the addition of the water-absorbing material improved the uniaxial compressive strength on the age of 7 days.
【００２４】[0024]
【表２】 [Table 2]
【００２５】[0025]
【発明の効果】本発明の固化材は組成的に簡単なもので
あるが、改良後土壌の材令７日後の一軸圧縮強度は０．
５ｋｇｆ／ｃｍ2以上と歩行可能な強度を有しているこ
とから、その上での作業が可能になるだけでなく、ｐＨ
値も、土壌の緩衝能力によるｐＨ値降下が速やかにおこ
り易い１０以下に収まっており、アルカリ公害を引き起
こす可能性も低く、含水土壌の固化改良材としての利用
価値が高い。Although the solidified material of the present invention is simple in composition, the unconfined compressive strength of the soil after the improvement of soil after 7 days is 0.1.
Since it has a walking strength of 5 kgf / cm 2 or more, it is possible to work on it,
The pH value is within 10 or less, where the pH value drop due to the buffering capacity of the soil is likely to occur quickly, the possibility of causing alkaline pollution is low, and the utility value as a solidification improving material for hydrous soil is high.
Claims (5)
／または硫酸鉄と、残部が酸化マグネシウムより成る組
成物を必須成分とする、含水土壌用固化材。1. A solidifying material for hydrous soil, comprising, as essential components, a composition comprising 10 to 50 parts by weight of aluminum sulfate and / or iron sulfate and the balance magnesium oxide.
量部当たり、更に０．１〜５重量部の有機合成高分子吸
水材を添加した、含水土壌用固化材。2. A solidifying material for hydrous soil, further comprising 0.1 to 5 parts by weight of an organic synthetic polymer water absorbing material per 100 parts by weight of the solidifying material essential component according to claim 1.
量部当たり、更に５〜６０重量部の故紙を添加した、含
水土壌用固化材。3. A solidified material for hydrous soil, further comprising 5 to 60 parts by weight of waste paper per 100 parts by weight of the solidified material essential component according to claim 1.
量部当たり、更に５〜６０重量部の無機質多孔体吸水材
を添加した、含水土壌用固化材。4. A solidified material for hydrous soil, further comprising 5 to 60 parts by weight of an inorganic porous water-absorbing material per 100 parts by weight of the solidified material essential component according to claim 1.
土壌用固化材を、含水土壌１ｍ3当たり５０〜４００ｋ
ｇ添加する、含水土壌の固化改良方法。5. The water-containing soil solidifying material according to claim 1, wherein the solidified material for water-containing soil is 50 to 400 k / m 3 of water-containing soil.
g, a method for improving solidification of hydrous soil.
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| JP2002241154A (en) * | 2001-02-14 | 2002-08-28 | National Institute For Rural Engineering | Cement composition |
| JP2005306939A (en) * | 2004-04-19 | 2005-11-04 | Murakashi Sekkai Kogyo Kk | Low alkaline solidifying material composition |
| JP2009013427A (en) * | 2001-11-30 | 2009-01-22 | Matsuda Giken Kogyo Kk | Agent for solidifying and insolubilizing soil and soil treating method |
| JP2012021064A (en) * | 2010-07-13 | 2012-02-02 | Murakashi Sekkai Kogyo Kk | Mixed composition of acidic powdered compound and alkaline powdered compound |
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| JP2014184437A (en) * | 2001-11-30 | 2014-10-02 | Matsuda Giken Kogyo Kk | Solidification insolubilization agent for contaminated soil |
| JP2009013427A (en) * | 2001-11-30 | 2009-01-22 | Matsuda Giken Kogyo Kk | Agent for solidifying and insolubilizing soil and soil treating method |
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