JPH10279937A - Cement-based solidification material - Google Patents

Cement-based solidification material

Info

Publication number
JPH10279937A
JPH10279937A JP8358197A JP8358197A JPH10279937A JP H10279937 A JPH10279937 A JP H10279937A JP 8358197 A JP8358197 A JP 8358197A JP 8358197 A JP8358197 A JP 8358197A JP H10279937 A JPH10279937 A JP H10279937A
Authority
JP
Japan
Prior art keywords
cement
solidification
ground
soil
calcium aluminate
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
Application number
JP8358197A
Other languages
Japanese (ja)
Inventor
Setsuo Arai
井 節 雄 新
Yuji Yoshioka
岡 勇 治 吉
Yasuhiro Uchiyama
山 康 広 内
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taiheiyo Cement Corp
Original Assignee
Nihon Cement Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nihon Cement Co Ltd filed Critical Nihon Cement Co Ltd
Priority to JP8358197A priority Critical patent/JPH10279937A/en
Publication of JPH10279937A publication Critical patent/JPH10279937A/en
Pending legal-status Critical Current

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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
    • C04B28/06—Aluminous cements
    • C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
    • 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
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
    • 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
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

(57)【要約】 【課題】 セメント系固化材を粉体状態で添加して地盤
改良する際に、地盤土壌への混合不良ないし地盤土壌中
の水分不足による未水和セメントの残留に起因する当該
セメント系固化材からの重金属イオンの溶出を防止し、
かつ、固化後においても容易に掘削できる強度を地盤に
与えるための粉体添加用セメント系固化材を提供するこ
と。 【解決手段】 セメント系固化材を粉体状態で添加して
地盤改良する際に、地盤土壌への混合不良ないし地盤土
壌中の水分不足に起因する当該セメント系固化材からの
重金属イオンの溶出を防止し、かつ、固化後においても
容易に掘削できる強度を地盤に与えるためのセメント系
固化材であって、水硬性組成物に対してカルシウムアル
ミネート系鉱物を含有する混合物を混合してなることを
特徴とする、セメント系固化材。(57) [Problem] To improve the ground by adding a cement-based solidifying material in a powder state, due to poor mixing with the ground soil or residual unhydrated cement due to insufficient moisture in the ground soil. Prevent elution of heavy metal ions from the cement-based solidification material,
Also, to provide a cementitious solidified material for powder addition for imparting strength to the ground that allows easy excavation even after solidification. SOLUTION: When a cement-based solidifying agent is added in a powder state to improve the ground, the elution of heavy metal ions from the cement-based solidifying agent due to poor mixing into the ground soil or insufficient water in the ground soil is considered. It is a cement-based solidification material for preventing, and giving strength to the ground that can be easily excavated even after solidification, which is obtained by mixing a mixture containing a calcium aluminate-based mineral with a hydraulic composition. A cement-based solidification material characterized by the following.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、地盤改良のための
セメント系固化材に関するものであり、特に粉体状態で
地盤土壌に添加混合しても該セメント系固化材中からの
６価クロム等の有害重金属イオンの溶出を土壌環境基準
値以下に抑制でき、地盤土壌に適度な固化強度を与える
セメント系固化材に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement-based solidification material for soil improvement, and more particularly to hexavalent chromium or the like from a cement-based solidification material even when it is added to and mixed with ground soil in a powder state. The present invention relates to a cement-based solidifying material that can suppress the elution of harmful heavy metal ions to below the soil environmental standard value and provide the soil with appropriate solidification strength.

【０００２】[0002]

【従来の技術】地盤を改良する方法としては、従来から
セメント系固化材を使用する方法が広く行われている。
ここで固化材の添加方式に着目すると、この方法は、固
化材と水とを予め所定配合比で混練したものを土壌に添
加するスラリー方式と、粉体である固化材をそのままの
状態で土壌に添加し混合する粉体方式に分けることがで
きる。2. Description of the Related Art As a method for improving the ground, a method using a cement-based solidifying material has been widely used.
Here, paying attention to the method of adding the solidifying material, there are two methods: a slurry method in which a solidified material and water are kneaded in advance at a predetermined mixing ratio, and a slurry method in which the solidified material, which is a powder, is added to the soil as it is. To be added to and mixed with the powder.

【０００３】従来のセメント系固化材による粉体添加に
おいては専ら固化強度が重要視され、セメント系固化材
自体に不可避的に僅かに含有する６価クロム等の重金属
イオンの溶出は必ずしも十分問題とされていなかった。
一般にポルトランドセメント、高炉セメント、フライア
ッシュセメントなどの各種水硬性組成物は僅かながら６
価クロム等の重金属イオン源を含有する場合があり、こ
れら重金属イオンが環境中に溶出しないようにすること
は環境保護の観点から重要であり、また土壌環境基準に
おいても有害重金属の土壌への溶出防止のための基準値
が定められている。[0003] In the conventional powder addition using a cement-based solidification material, the solidification strength is regarded as important, and the elution of heavy metal ions such as hexavalent chromium, which is unavoidably slightly contained in the cement-based solidification material itself, is not necessarily a sufficient problem. Had not been.
Generally, various hydraulic compositions such as Portland cement, blast furnace cement, fly ash cement, etc. are slightly more than 6%.
It may contain a source of heavy metal ions such as valent chromium, and it is important to prevent these heavy metal ions from eluting into the environment from the viewpoint of environmental protection. Standard values for prevention are defined.

【０００４】[0004]

【発明が解決しようとする課題】上述したセメント系固
化材の粉体方式による使用においては、改良すべき地盤
土壌との混合が不均一ないし不充分になったり、土壌中
の水分のばらつきに起因する含水率の低い地盤土壌への
該固化材の添加では、混合したセメント系固化材が未水
和の状態のままで土壌中に残留する場合がある。このよ
うな土壌に対し土壌環境基準に準拠した方法で溶出試験
を行った場合、未水和部分のセメント系固化材から重金
属イオンが僅かに溶出することがあり、土壌環境基準の
基準値を満さないことがある。In the use of the above-mentioned cement-based solidification material by the powder method, the mixing with the ground soil to be improved becomes uneven or insufficient, or the mixing due to the variation in the water content in the soil occurs. When the solidified material is added to the ground soil having a low moisture content, the mixed cement-based solidified material may remain in the soil in an unhydrated state. When such soil is subjected to a dissolution test in accordance with the soil environment standards, heavy metal ions may be slightly eluted from the cement-solidified material in the unhydrated portion, and the standard value of the soil environment standards is not satisfied. May not.

【０００５】[0005]

【課題を解決するための手段】本発明は上述した従来の
粉体方式による使用でのセメント系固化材の問題点を解
決することに向けられたものであって、セメント系固化
材を粉体状態で添加して地盤改良する際に、地盤土壌へ
の混合不良ないし地盤土壌中の水分不足に起因する当該
セメント系固化材からの重金属イオンの溶出を防止し、
かつ、固化後においても容易に掘削できる強度を地盤に
与えるためのセメント系固化材を提供することを目的と
するものである。固化後においても容易に掘削できる強
度とは、後述の実施例での試験方法においておおよそ４
〜１０kgｆ／ｃｍ2 の強度を意味する。SUMMARY OF THE INVENTION The present invention is directed to solving the above-mentioned problems of the cement-based solidified material used in the conventional powder system, and is intended to solve the problem of the cement-based solidified material. When added in the state to improve the ground, prevent elution of heavy metal ions from the cement-based solidified material due to poor mixing into the ground soil or insufficient water in the ground soil,
Further, it is an object of the present invention to provide a cement-based solidified material for giving the ground strength that allows easy excavation even after solidification. The strength that can be easily excavated even after solidification is approximately 4 in the test method in the examples described later.
It means a strength of 〜１０10 kgf / cm 2 .

【０００６】上述した課題を解決するために、本発明に
よるセメント系固化材は、水硬性組成物に対してカルシ
ウムアルミネート系鉱物を含有する混合物をさらに混合
してなることを特徴とする。In order to solve the above-mentioned problems, a cement-based solidifying material according to the present invention is characterized in that a mixture containing a calcium aluminate-based mineral is further mixed with a hydraulic composition.

【０００７】本発明によれば、ポルトランドセメント等
の水硬性組成物に対してさらにカルシウムアルミネート
系鉱物を含有する混合物を一定量添加することによっ
て、粉体方式で処理された地盤土壌に対してもカルシウ
ム未水和の水硬性組成物中に僅かに存在する６価クロム
等の重金属イオンの溶出を効果的に防止することがで
き、さらに改良すべき地盤土壌の固化強度も再掘削が必
要となった場合、それが可能な強度とすることができ
る。According to the present invention, a fixed amount of a mixture containing a calcium aluminate mineral is further added to a hydraulic composition such as Portland cement, etc. It is also possible to effectively prevent the elution of heavy metal ions such as hexavalent chromium which are slightly present in the hydraulic composition that is not hydrated with calcium, and the solidification strength of the ground soil to be improved requires re-digging. If so, it can be made as strong as possible.

【０００８】上記作用効果が発現する機構は必ずしも明
らかではないが、水硬性組成物に加えてさらに特定量添
加されるカルシウムアルミネート系鉱物含有混合物が、
水硬性組成物中の水硬性化合物と協同的に作用して、６
価クロムイオン種の溶出に際してのエトリンガイトの生
成のタイミングならびにその生成量を適切に制御して、
溶出６価クロムイオン種を迅速に固定化し、かつ、固化
強度の低下が生じないような状態を出現させるものと考
えられる。このようにして生成するエトリンガイトは、
６価クロムイオンないしその原子団ＣｒＯ４ 2-をその結
晶構造中に置換固定することによって溶出クロムイオン
を固定するものと推測される。エトリンガイトの示性式
は一般的に、 Ｃａ６［Ａｌ（ＯＨ）６］２（ＳＯ４）３・３２Ｈ２Ｏ で表すことができるが、この式中の（ＳＯ４）の位置に
ＣｒＯ４ 2-がそのまま置換され、下記の式 Ｃａ６［Ａｌ（ＯＨ）６］２（ＣｒＯ４）３・３２Ｈ２
Ｏ で表される置換体を形成することによりクロムイオン種
を固定するものと考えられる。したがって、上記の通り
水硬性組成物の水和速度すなわち６価クロムイオン等の
重金属イオンの溶出とエトリンガイドの生成のタイミン
グおよび生成量が重要であり、本願発明では、特にこの
点を検討した結果、セメント系固化材の種類を特定すれ
ば良いことを見出し本発明を完成させたものである。[0008] The mechanism by which the above-mentioned effects are exhibited is not necessarily clear, but a calcium aluminate-based mineral-containing mixture further added in a specific amount in addition to the hydraulic composition,
Acting synergistically with the hydraulic compound in the hydraulic composition, 6
Properly controlling the timing of ettringite formation and the amount of ettringite upon elution of trivalent chromium ion species,
It is considered that a state in which the eluted hexavalent chromium ion species is quickly immobilized and the solidification strength does not decrease is produced. The ettringite produced in this way is
It is presumed that the eluted chromium ions are fixed by replacing and fixing hexavalent chromium ions or its atomic group CrO 4 2- in the crystal structure. The ettringite's descriptive formula can be generally represented by Ca 6 [Al (OH) 6 ] 2 (SO 4 ) 3 .32H 2 O, where CrO 4 2 is located at the position of (SO 4 ) in this formula. - is substituted as it is, the formula Ca 6 below [Al (OH) 6] 2 (CrO 4) 3 · 32H 2
It is considered that the chromium ion species is fixed by forming a substituent represented by O 2. Therefore, as described above, the hydration rate of the hydraulic composition, that is, the timing and amount of elution of heavy metal ions such as hexavalent chromium ions and the generation of ettrine guides are important. In the present invention, this point was particularly studied. As a result, it has been found that the type of the cement-based solidifying material may be specified, and the present invention has been completed.

【０００９】[0009]

【発明の実施の形態】以下、本発明を好ましい態様に基
づいてさらに具体的に説明する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described more specifically based on preferred embodiments.

【００１０】本発明によるセメント系固化材は、水硬性
組成物に対してカルシウムアルミネート系鉱物を含有す
る混合物をさらに混合してなることを特徴とする。The cement-based solidifying material according to the present invention is characterized in that a mixture containing a calcium aluminate-based mineral is further mixed with a hydraulic composition.

【００１１】本発明における水硬性組成物は特に限定さ
れないが、通常の普通セメント（ＮＣセメント）等のポ
ルトランドセメント系組成物が好ましく用いられ得る。The hydraulic composition in the present invention is not particularly limited, but a portland cement-based composition such as ordinary ordinary cement (NC cement) can be preferably used.

【００１２】カルシウムアルミネート系鉱物含有混合物
は、エトリンガイトの生成に必要なものを含有する組成
物であり、具体的にはその好ましい例として、Ｃ12Ａ7
（ＣａＯ：１２モル、Ａｌ２Ｏ３：７モル含有する鉱
物）、アルミン酸ソーダ、炭酸ソーダ、消石灰および硫
酸ナトリウムからなるエトリンガイドを生成することに
より急硬性を付与する混合物を例示することができる。
さらに具体的には、下記の組成の混合物がより好ましい
ものとして用いられ得る。The calcium aluminate-based mineral-containing mixture is a composition containing a substance necessary for the production of ettringite. Specifically, a preferable example thereof is C 12 A 7
(Mineral containing 12 moles of CaO and 7 moles of Al 2 O 3 ), a mixture imparting rapid hardening by producing an ettrine guide composed of sodium aluminate, sodium carbonate, slaked lime and sodium sulfate can be exemplified. it can.
More specifically, a mixture having the following composition can be used as a more preferable mixture.

【００１３】Ｃ12Ａ7 ４０〜５０重量部、 アルミン酸ソーダ ９〜１１重量部、 炭酸ソーダ ２２〜２８重量部、 消石灰 ９〜１１重量部、 硫酸ナトリウム ９〜１１重量部、 これらのものであれば種々の土壌においてセメント中か
らの重金属イオンの溶出を土壌環境基準値以下とするこ
とができ、固化後においても容易に掘削できる適度な固
化強度（４〜１０kgｆ／ｃｍ2 ）を土壌に対する添加率
の調整だけで得ることができる。C 12 A 7 40 to 50 parts by weight, sodium aluminate 9 to 11 parts by weight, sodium carbonate 22 to 28 parts by weight, slaked lime 9 to 11 parts by weight, sodium sulfate 9 to 11 parts by weight. In various soils, the elution of heavy metal ions from cement can be made equal to or less than the soil environmental standard value, and an appropriate solidification strength (4 to 10 kgf / cm 2 ) that can be easily excavated even after solidification is added to the soil. It can be obtained only by adjusting.

【００１４】上記の水硬性組成物とカルシウムアルミネ
ート系鉱物含有混合物の配合比率は、水硬性組成物８８
〜９４重量％に対してカルシウム・アルミナ系鉱物含有
混合物６〜２５重量％添加することが好ましく、さらに
好ましくは、水硬性組成物９０〜９４重量％、カルシウ
ムアルミネート系鉱物含有混合物６〜１０重量％であ
る。カルシウムアルミネート系鉱物含有混合物が６重量
％未満では水硬性組成物中の水硬性化合物との協同的な
作用効果を発現させることは困難であり、特に６価クロ
ムイオン種の溶出を土壌環境基準値以下の水準に抑制す
ることはできない。一方、カルシウムアルミネート系鉱
物含有混合物を２５重量％を超えて添加した場合、６価
クロム溶出防止効果は飽和してしまうとともに急硬性が
著しくなるので取り扱い難くなり好ましくない。The mixing ratio of the above-mentioned hydraulic composition and the mixture containing the calcium aluminate mineral is such that the hydraulic composition 88
It is preferable to add 6 to 25% by weight of the calcium-alumina-based mineral-containing mixture, more preferably 90 to 94% by weight of the hydraulic composition, and 6 to 10% by weight of the calcium-aluminate-based mineral-containing mixture with respect to about 94% by weight. %. If the calcium aluminate-based mineral-containing mixture is less than 6% by weight, it is difficult to exhibit a cooperative effect with the hydraulic compound in the hydraulic composition. It cannot be suppressed below the level. On the other hand, when the calcium aluminate-based mineral-containing mixture is added in excess of 25% by weight, the effect of preventing hexavalent chromium elution is saturated and rapid hardening becomes remarkable.

【００１５】このように、本願発明によれば、セメント
系固化材を粉体状態で添加して地盤改良する際に、地盤
土壌への混合不良ないし地盤土壌中の水分不足による未
水和セメントの残留に起因する当該セメント系固化材か
らの６価クロム等の重金属イオン種の溶出を防止し、か
つ、固化後においても容易に掘削できる強度を地盤に与
えるためのセメント系固化材を得ることができる。As described above, according to the present invention, when a cement-based solidifying material is added in a powder state to improve the ground, poor mixing with the ground soil or insufficient moisture in the ground soil due to insufficient moisture in the ground soil. It is possible to obtain a cement-based solidification material for preventing heavy metal ionic species such as hexavalent chromium from being eluted from the cement-based solidification material due to the residue and for giving the ground strength that allows easy excavation even after solidification. it can.

【００１６】次に、カルシウムアルミネート系鉱物含有
混合物の製造方法について説明する。カルシウムアルミ
ネート系鉱物混合物はＣ12Ａ７などのカルシウムアルミ
ネート系鉱物（クリンカ）を粉砕する際、他の構成材料
を添加して混合粉砕するか、カルシウムアルミネート系
鉱物の粉砕物に他の構成材料を添加混合することによっ
て得られる。該混合物の粉末度はセメントと同程度であ
れば特に限定されないが、おおよそブレーン値で３００
０〜５０００ｃｍ2 ／ｇが好ましい。Next, a method for producing a mixture containing a calcium aluminate mineral will be described. When calcium aluminate mineral mixture to grind the calcium aluminate mineral such as C 12 A 7 (clinker), or mixed and ground with the addition of other constituent materials, of other pulverized calcium aluminate mineral It is obtained by adding and mixing constituent materials. The fineness of the mixture is not particularly limited as long as it is substantially the same as that of the cement.
It is preferably from 0 to 5000 cm 2 / g.

【００１７】なお、上記以外のカルシウムアルミネート
系鉱物を含有する混合物としては、従来のカルシウムア
ルミネート系鉱物を主体とした急硬性セメント混和材が
挙げられる。それらに置いて、カルシウムアルミネート
系鉱物としてはＣ12Ａ７組成非晶質物、Ｃ11Ａ７・Ｃａ
Ｆ２、ＣａＯ−アルカリ−Ａｌ２Ｏ３系ガラス、ＣａＯ
−アルカリ−Ａｌ２Ｏ３−ＳｉＯ２系ガラスアウイン、
アルミナセメント（ＣＡ，Ｃ２Ａ等）等である。Examples of the mixture containing a calcium aluminate-based mineral other than those described above include a conventional rapid-hardening cement admixture mainly containing a calcium aluminate-based mineral. In addition, as the calcium aluminate-based mineral, C 12 A 7 composition amorphous material, C 11 A 7 .Ca
F 2, CaO-alkali -Al 2 O 3 based glass, CaO
- alkali -Al 2 O 3 -SiO 2 based glass A Wynn,
Alumina cement (CA, C 2 A, etc.) and the like.

【００１８】また、硫酸ナトリウムの代わりに明番、石
膏等に、炭酸ソーダの代わりに他の水溶性炭酸塩を用い
てもよい。Further, other water-soluble carbonates may be used in place of sodium sulfate, such as gypsum, gypsum, etc., and sodium carbonate.

【００１９】本願発明のセメント系固化材は、前記粉体
方式の他、もちろんスラリー方式で用いることも可能で
ある。The cement-based solidification material of the present invention can be used in a slurry system in addition to the powder system.

【００２０】粉体方式で用いる場合は、従来のものと同
様、本願発明のセメント系固化材５０〜２００kgを地盤
土壌１ｍ3 に対して添加し、バックフォー等の混合攪拌
機を用いて混合し、その後転圧して地盤土壌を平坦化す
る。In the case of using the powder system, 50 to 200 kg of the cement-based solidifying material of the present invention is added to 1 m 3 of the ground soil and mixed using a mixing stirrer such as a back pho, as in the conventional method. Then, the soil is flattened by compaction.

【００２１】[0021]

【実施例】６価クロムを５ｍｇ／ｌ含有するＮＣ（日本
セメント社製普通セメント）ならびに下記の組成のカル
シウムアルミネート系鉱物含有混合物を用意し、下記表
１に示す配合比率で混合することによって本願発明のセ
メント系固化材を製造した。EXAMPLE An NC (ordinary cement manufactured by Nippon Cement Co.) containing 5 mg / l of hexavalent chromium and a calcium aluminate-based mineral-containing mixture having the following composition were prepared and mixed at the mixing ratio shown in Table 1 below. The cement-based solidification material of the present invention was manufactured.

【００２２】Ｃ12Ａ7 ：４５重量部 アルミン酸ソーダ：１０重量部、（昭和電工社製） 炭酸ソーダ：２５重量部、（昭和電工社製） 消石灰：１０重量部、（昭和電工社製） 硫酸ナトリウム：１０量部（昭和電工社製） 得られた粉体添加用セメント系固化材を用いて、土壌環
境基準（環境庁告示第４６号）に掲げる方法に準拠して
６価クロムイオンの溶出試験（ジフェニルカルバジド吸
光光度法）を行った。具体的には、以下の方法に基づい
て溶出試験を行った。なお、土壌はラルト質砂を用い
た。土壌中の含水率は５％になるように（未水和セメン
トが残るように）調整した。C 12 A 7 : 45 parts by weight Sodium aluminate: 10 parts by weight (manufactured by Showa Denko) Sodium carbonate: 25 parts by weight (manufactured by Showa Denko) Slaked lime: 10 parts by weight (manufactured by Showa Denko) Sodium sulfate: 10 parts by weight (manufactured by Showa Denko KK) Using the obtained cement-based solidifying material for powder addition, hexavalent chromium ion An elution test (diphenylcarbazide absorptiometry) was performed. Specifically, a dissolution test was performed based on the following method. The soil used was ralt sand. The water content in the soil was adjusted to be 5% (so as to leave unhydrated cement).

【００２３】１）採取した土壌１ｍ3に対して各例の固
化材を１００kg混合して土壌の固化を実施したのち、各
々の試料を溶媒（純水に塩酸を加えてｐＨ５．８〜６．
３にしたもの）に、試料：溶媒＝１：１０の割合で混合
して試料液を調製する。1) 100 kg of the solidified material of each example was mixed with 1 m 3 of the collected soil to solidify the soil, and then each sample was subjected to a solvent (hydrochloric acid added to pure water to pH 5.8 to 6.
3) and a sample: solvent = 1: 10 mixture to prepare a sample solution.

【００２４】２）常温常圧で振とう機を用いて６時間連
続振とうする。2) Shake continuously for 6 hours using a shaker at normal temperature and normal pressure.

【００２５】３）試料液をグラスファイバーろ紙（孔径
１μｍ）を用いて２回ろ過したのち、毎分３０００回転
で２０分遠心分離した上澄みを検液とする。3) The sample solution is filtered twice using a glass fiber filter paper (pore size: 1 μm), and then centrifuged at 3000 rpm for 20 minutes to obtain a supernatant.

【００２６】４）得られた各検液をジフェニルカルバジ
ド吸光光度法を用いて検液中の吸光度を測定する（波長
５４０ｎｍ付近）。4) The absorbance of each test solution obtained is measured by diphenylcarbazide absorption spectrophotometry (wavelength around 540 nm).

【００２７】得られた溶出試験の結果を下表１に示す
（表中ではカルシウムアルミネート系鉱物含有混合物を
混合物と称して示す）。The results of the obtained dissolution test are shown in Table 1 below (in the table, a mixture containing a calcium aluminate-based mineral is referred to as a mixture).

【００２８】 表１ 固化材の配合（重量比） ６価クロム溶出量試験例 ＮＣ 混合物 （ｍｇ／ｌ） １ ５０ ５０ ０．０２ ２ ７５ ２５ ０．０２ ３ ８８ １２ ０．０２ ４ ９４ ６ ０．０１ ５ ９７ ３ ０．０８ ６ ９９．５ ０．５ ０．１１ ７ ９９．９９９ ０．００１ ０．１１ ８ １００ ０ ０．１２ 上記の結果から、カルシウムアルミネート系鉱物含有混
合物の含有量が６重量％以上の範囲において６価クロム
溶出量が土壌環境基準値（０．０５mg／ｌ）以下に減少
することが分かる。 Table 1 Formulation of solidifying material (weight ratio) Hexavalent chromium elution amount Test Example NC mixture (mg / l) 150 50 0.02 2 75 25 0.02 3 88 12 0.02 4 94 6 0. 0 15 97 3 0.08 6 99.5 0.5 0.11 7 99.9999 0.001 0.11 8 100 0 0.12 From the above results, the content of the calcium aluminate-based mineral-containing mixture was 6 It can be seen that the elution amount of hexavalent chromium is reduced below the soil environmental standard value (0.05 mg / l) in the range of not less than weight%.

【００２９】次に、下記の配合比の本願発明セメント系
固化材を用いて固化した豊浦標準砂の一軸圧縮試験を行
い、固化材の圧縮強度に及ぼす影響を調べた。Next, a uniaxial compression test of Toyoura standard sand solidified by using the cement-based solidified material of the present invention having the following compounding ratio was conducted to examine the effect of the solidified material on the compressive strength.

【００３０】硬化体の配合比は次の通りである。The mixing ratio of the cured product is as follows.

【００３１】標準砂：１００重量部 水 ：１２重量部 固化材：４重量部 形成した強度試験用供試体の寸法：５cm（径）×１０cm
（長さ） 一軸圧縮試験の結果を下記表２に示す。Standard sand: 100 parts by weight Water: 12 parts by weight Solidified material: 4 parts by weight Dimensions of formed test specimen for strength test: 5 cm (diameter) × 10 cm
(Length) The results of the uniaxial compression test are shown in Table 2 below.

【００３２】 配合（重量比） 一軸圧縮強度（ｋｇｆ／cm2 ） 例 ＮＣ 混合物 ３ｄ ７ｄ ２８ｄ １ ５０ ５０ 3.61 4.60 4.88 ２ ７５ ２５ 6.11 6.28 8.63 ３ ８８ １２ 6.20 6.87 8.52 ４ ９４ ６ 3.81 4.83 7.28 ８ １００ ０ 3.95 8.10 15.02 好ましい固化強度１〜１０Formulation (weight ratio) Uniaxial compressive strength (kgf / cm 2 ) Example NC mixture 3d 7d 28d 150 50 3.61 4.60 4.88 275 25 6.11 6.28 8.63 388 12 6.20 6.87 8.52 4 94 6 3.81 4.83 7.28 8 100 00 3.95 8.10 15.02 Preferred solidification strength 1-10

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ // Ｃ０４Ｂ 28:06 Ｃ０９Ｋ 103:00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI // C04B 28:06 C09K 103: 00

Claims (6)

【特許請求の範囲】[Claims] 【請求項１】セメント系固化材を添加して地盤改良する
際に、粉体状態で添加混合しても地盤土壌への混合不良
ないし地盤土壌中の水分不足に起因する当該セメント系
固化材からの重金属イオンの溶出を防止し、かつ、固化
後においても容易に掘削できる強度を地盤に与えるため
のセメント系固化材であって、 水硬性組成物に対してカルシウムアルミネート系鉱物を
含有する混合物を混合してなることを特徴とする、セメ
ント系固化材。When a cement-based solidification material is added to improve the ground, even if the cement-based solidification material is added and mixed in a powdery state, the cement-based solidification material due to poor mixing with the ground soil or insufficient moisture in the ground soil is removed. A cement-based solidification material for preventing the dissolution of heavy metal ions from the soil and providing the ground with strength that allows easy excavation even after solidification, and a mixture containing a calcium aluminate-based mineral with respect to a hydraulic composition A cement-based solidified material characterized by being mixed with a cementitious material. 【請求項２】前記水硬性組成物がポルトランドセメント
系組成物である、請求項１に記載のセメント系固化材。2. The cement-based solidifying material according to claim 1, wherein the hydraulic composition is a Portland cement-based composition. 【請求項３】前記重金属イオンが６価クロムイオンであ
る、請求項１に記載の粉体添加用セメント系固化材。3. The cement-based solidification material for powder addition according to claim 1, wherein said heavy metal ion is hexavalent chromium ion. 【請求項４】固化材自体に不可避的に存在する６価クロ
ムイオン種が溶出する際あるいはそれ以前にエトリンガ
イトが速やかに生成して６価クロムイオン種を固定化
し、かつ、固化強度の低下が生じないような量範囲で、
前記水硬性組成物とカルシウムアルミネート系鉱物含有
混合物が混合されてなる、請求項１に記載のセメント系
固化材。4. When the hexavalent chromium ion species inevitably present in the solidified material itself elutes or before it elutes, ettringite is rapidly generated to fix the hexavalent chromium ion species, and the solidification strength is reduced. In the amount range that does not occur,
The cement-based solidification material according to claim 1, wherein the hydraulic composition and a mixture containing a calcium aluminate-based mineral are mixed. 【請求項５】ポルトランドセメント系組成物８８〜９４
重量％およびカルシウムアルミネート系鉱物含有混合物
６〜２５重量％含有してなる請求項２に記載のセメント
系固化材。5. A Portland cement composition 88 to 94.
3. The cement-based solidification material according to claim 2, comprising 6 to 25% by weight of a calcium aluminate-based mineral-containing mixture. 【請求項６】前記カルシウムアルミネート系鉱物含有混
合物が、Ｃ12Ａ7 、アルミン酸ソーダ、炭酸ソーダ、消
石灰および硫酸ナトリウムを含む混合物からなる、請求
項５に記載の粉体添加用セメント系固化材。6. The cement-based solidification for powder addition according to claim 5, wherein the calcium aluminate-based mineral-containing mixture comprises a mixture containing C 12 A 7 , sodium aluminate, sodium carbonate, slaked lime and sodium sulfate. Wood.
JP8358197A 1997-04-02 1997-04-02 Cement-based solidification material Pending JPH10279937A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8358197A JPH10279937A (en) 1997-04-02 1997-04-02 Cement-based solidification material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8358197A JPH10279937A (en) 1997-04-02 1997-04-02 Cement-based solidification material

Publications (1)

Publication Number Publication Date
JPH10279937A true JPH10279937A (en) 1998-10-20

Family

ID=13806468

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8358197A Pending JPH10279937A (en) 1997-04-02 1997-04-02 Cement-based solidification material

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Country Link
JP (1) JPH10279937A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002047489A (en) * 2000-08-04 2002-02-12 Denki Kagaku Kogyo Kk Low hexavalent chromium injection material
JP2002088364A (en) * 2000-09-14 2002-03-27 Denki Kagaku Kogyo Kk Low hexavalent chromium injection material
JP2002097057A (en) * 2000-09-20 2002-04-02 Denki Kagaku Kogyo Kk Low hexavalent chromium injection material
JP2004075746A (en) * 2002-08-12 2004-03-11 Sumitomo Osaka Cement Co Ltd Two-pack filler for underground bonding
KR100681272B1 (en) 2004-11-09 2007-02-09 민병익 Manufacturing method of solidifying accelerator and manufacturing method of ground improving material using solidifying accelerator formed by the method
CN104863038A (en) * 2015-04-08 2015-08-26 浙江师范大学 Method for preparing lime and cement solidified soil by using soil solidification agent
FR3056930A1 (en) * 2016-10-04 2018-04-06 Holcim Technology Ltd PROCESS FOR TREATING POLLUTED SOIL WITH A MAYENITE PHASE HYDRAULIC BINDER
JP2018109128A (en) * 2017-01-05 2018-07-12 デンカ株式会社 Hexavalent chromium elution reducing agent and hexavalent chromium elution reducing method using the same.

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002047489A (en) * 2000-08-04 2002-02-12 Denki Kagaku Kogyo Kk Low hexavalent chromium injection material
JP2002088364A (en) * 2000-09-14 2002-03-27 Denki Kagaku Kogyo Kk Low hexavalent chromium injection material
JP2002097057A (en) * 2000-09-20 2002-04-02 Denki Kagaku Kogyo Kk Low hexavalent chromium injection material
JP2004075746A (en) * 2002-08-12 2004-03-11 Sumitomo Osaka Cement Co Ltd Two-pack filler for underground bonding
KR100681272B1 (en) 2004-11-09 2007-02-09 민병익 Manufacturing method of solidifying accelerator and manufacturing method of ground improving material using solidifying accelerator formed by the method
CN104863038A (en) * 2015-04-08 2015-08-26 浙江师范大学 Method for preparing lime and cement solidified soil by using soil solidification agent
FR3056930A1 (en) * 2016-10-04 2018-04-06 Holcim Technology Ltd PROCESS FOR TREATING POLLUTED SOIL WITH A MAYENITE PHASE HYDRAULIC BINDER
WO2018065447A1 (en) * 2016-10-04 2018-04-12 Holcim Technology Ltd Method for treating polluted soil by a hydraulic binder with mayenite phase
US10562083B2 (en) 2016-10-04 2020-02-18 Holcim Technology Ltd Method for treating polluted soil by a hydraulic binder with mayenite phase
AU2017338314B2 (en) * 2016-10-04 2022-08-11 Holcim Technology Ltd Method for treating polluted soil by a hydraulic binder with mayenite phase
JP2018109128A (en) * 2017-01-05 2018-07-12 デンカ株式会社 Hexavalent chromium elution reducing agent and hexavalent chromium elution reducing method using the same.

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