JPH10212479A - Solidifying material for soil improvement - Google Patents

Solidifying material for soil improvement

Info

Publication number
JPH10212479A
JPH10212479A JP9015126A JP1512697A JPH10212479A JP H10212479 A JPH10212479 A JP H10212479A JP 9015126 A JP9015126 A JP 9015126A JP 1512697 A JP1512697 A JP 1512697A JP H10212479 A JPH10212479 A JP H10212479A
Authority
JP
Japan
Prior art keywords
gypsum
soil
stimulant
solidifying
present
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.)
Withdrawn
Application number
JP9015126A
Other languages
Japanese (ja)
Inventor
Etsuro Asakura
悦郎 朝倉
Fumio Kitamura
文夫 北村
Tetsuya Tachiki
哲也 立木
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.)
Mitsubishi Materials Corp
Original Assignee
Mitsubishi Materials Corp
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 Mitsubishi Materials Corp filed Critical Mitsubishi Materials Corp
Priority to JP9015126A priority Critical patent/JPH10212479A/en
Publication of JPH10212479A publication Critical patent/JPH10212479A/en
Withdrawn legal-status Critical Current

Links

Landscapes

  • Cultivation Of Plants (AREA)
  • Road Paving Structures (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain a solidifying material for the improvement of a soil, providing a solidifying-treated material exhibiting a prescribed strength and showing pH value closes to a neutral in contact with water, suitable for cultivating plants, and capable of effectively fixing heavy metals. SOLUTION: This solidifying material consists of a hydraulic material rich in aluminum compound, a gypsum and a mixed material, in which the mixed material is a blast furnace slag or a coal cinder, or a mixture of them and the hydraulic material is selected from an aluminum cement, aluminum hydroxide, an hauyne or a high alumina slag. In the case that the gypsum is anhydrous gypsum, a stimulant for the anhydrous gypsum and/or a stimulant for the mixed material is added. In the case that the gypsum is a calcined gypsum, the stimulant for the mixed material is added.

Description

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

【0001】[0001]

【発明の技術分野】本発明は、土壌、ヘドロ、焼却灰、
建設汚泥などの土質を改良する土質改良固化材に関する
ものであり、更に詳しくは強度発現性に優れ、植生に適
し、良好な地球環境が得られる土質改良用固化材に関す
る。
The present invention relates to soil, sludge, incineration ash,
The present invention relates to a solidification material for improving soil quality such as construction sludge, and more particularly, to a solidification material for soil improvement that has excellent strength development, is suitable for vegetation, and provides a favorable global environment.

【0002】[0002]

【従来の技術】従来の土質改良用固化材は、主にセメン
トあるいは生石灰から構成され、必要に応じて、消石
灰、仮焼ドロマイト、高炉スラグなどが混合されて使用
されているが、このような土質改良用固化材は、セメン
ト、生石灰、消石灰、仮焼ドロマイトなどの少なくとも
1種類のものが、通常、内割で30%以上配合されてい
るため、改良固化された土壌、ヘドロ、焼却灰などは、
水に溶解して通常pH11以上の高いアルカリ性を示し
ており、材令の経過とともに、改良土の表面は中性に近
くなっていくが、表面から10cmも入った所では、改
良直後と変わらない強いアルカリ性を示す。
2. Description of the Related Art Conventionally, a solidifying material for soil improvement is mainly composed of cement or quicklime, and if necessary, a mixture of slaked lime, calcined dolomite, blast furnace slag, etc. is used. As the solidification material for soil improvement, at least one kind of cement, quick lime, slaked lime, calcined dolomite, etc. is usually blended by 30% or more in an inner percentage, so that the improved solidified soil, sludge, incineration ash, etc. Is
Dissolves in water and shows high alkalinity, usually at pH 11 or higher. With the passage of age, the surface of the improved soil becomes nearly neutral, but at 10 cm from the surface, it is the same as immediately after improvement Shows strong alkalinity.

【0003】また従来の土質改良用固化材で処理した建
設汚泥などにおいても、そこから溶出する水のpHは非
常に高く排水基準で許容される上限のpH8.6(海域
ではpH9.0)を越えることが多い。そのため、改良
固化処理物は、そのままでは植物の育成に好ましくな
い。したがって植生に好ましくするためには、それに適
した未改良土で覆土するなどの手段を施すことが行わ
れ、手間と費用を要する点で問題となっていた。
[0003] Further, even in construction sludge treated with a conventional solidification material for soil improvement, the pH of water eluted therefrom is extremely high, which is an upper limit of pH 8.6 (pH 9.0 in sea areas) which is allowed by drainage standards. Often exceeds. Therefore, the improved solidified product is not preferable for growing plants as it is. Therefore, in order to make it suitable for vegetation, means such as covering soil with unimproved soil suitable for the vegetation have been used, and this has been a problem in that it requires labor and cost.

【0004】また従来の土質改良用固化材を、酸性土
壌、ピートなどの酸性物質等の土質に使用すると、硬化
が遅延したり、強度の発現性が悪かったり、硬化後に溶
解したりする。また、酸性雨、酸性河川水、酸性液によ
り、固化物が徐々に溶解し、固化処理による効果が減少
するのみならず、溶出カルシウム分の再結晶化により側
溝や排水路が閉塞するなどの問題が発生する。
[0004] Further, when a conventional solidifying material for soil improvement is used for soils such as acidic soils and acidic substances such as peat, the hardening is delayed, the strength is not sufficiently developed, or the hardening material is dissolved after the hardening. In addition, acid rain, acid river water, and acid liquid gradually dissolve solidified matter, which not only reduces the effect of solidification treatment, but also obstructs gutters and drainage channels due to recrystallization of eluted calcium. Occurs.

【0005】[0005]

【発明が解決しようとする課題】そこで、本発明者等
は、以上述べた従来の土質改良用固化材の問題点を除去
するため、鋭意研究を重ねた結果、固化処理物が所要の
物性を発揮する他に、水に接してpHが中性に近づくよ
うな材料を探究する中、固化処理物が所要の物性を発揮
することは勿論のこと、水に接してpHが中性に近づ
き、植生に適するばかりでなく、有害な重金属を効果的
に固定しうることを見出し、ここに本発明をなすに至っ
た。したがって、本発明が解決しようとする課題は、固
化処理物が所要の強度を発揮し、水に接してpHが中性
に近づき、植生に適し、さらに重金属を効果的に固定し
得る土質改良用固化材を提供することにある。
The inventors of the present invention have conducted intensive studies in order to eliminate the above-mentioned problems of the conventional solidification material for soil improvement, and as a result, the solidified material has required physical properties. In addition to exhibiting, while exploring materials that come into contact with water and the pH approaches neutrality, not only does the solidified product exhibit the required physical properties, but also the pH approaches neutrality in contact with water, The present invention has been found to be not only suitable for vegetation, but also to effectively fix harmful heavy metals, and the present invention has been made. Therefore, the problem to be solved by the present invention is that the solidified product exhibits the required strength, the pH approaches neutrality in contact with water, is suitable for vegetation, and is used for soil improvement capable of effectively fixing heavy metals. It is to provide a solidifying material.

【0006】[0006]

【課題を解決するための手段】本発明の前記課題を解決
するための手段は、以下の各発明によってそれぞれ達成
される。
Means for solving the above-mentioned problems of the present invention are achieved by the following inventions.

【0007】(1)アルミニウム化合物に富む水硬性材
料、石膏及び混合材からなる土質改良用固化材。 (2)混合材が高炉スラグ又は石炭灰であるかあるいは
両者の組合せであることを特徴とする前記第1項に記載
の土質改良用固化材。 (3)水硬性材料がアルミナセメント、水酸化アルミニ
ウム、アウインあるいはハイアルミナスラグから選択さ
れることを特徴とする前記第1項又は第2項に記載の土
質改良用固化材。 (4)石膏が無水石膏である場合、無水石膏刺激剤及び
/又は混合材の刺激剤を加えることを特徴とする前記第
1項乃至第3項のいずれかに記載の土質改良用固化材。 (5)石膏が半水石膏である場合、混合材の刺激剤を加
えることを特徴とする前記第1項乃至第3項のいずれか
に記載の土質改良用固化材。
(1) A solidification material for soil improvement comprising a hydraulic material rich in aluminum compounds, gypsum and a mixture. (2) The solidified material for improving soil quality according to the above (1), wherein the mixed material is blast furnace slag or coal ash or a combination of both. (3) The solidified material for improving soil properties according to the above item (1) or (2), wherein the hydraulic material is selected from alumina cement, aluminum hydroxide, auin or high alumina slag. (4) The solidified material for improving soil properties according to any one of the above-mentioned items 1 to 3, wherein when the gypsum is anhydrous gypsum, an anhydrous gypsum stimulant and / or a stimulant of a mixed material are added. (5) When the gypsum is hemihydrate gypsum, the solidifying material for improving soil properties according to any one of the above-mentioned items 1 to 3, wherein a stimulant of a mixed material is added.

【0008】以下に、本発明を更に詳細に説明すると、
本発明の要旨とするところは、本発明の土質改良用固化
材は、アルミニウム化合物に富む水硬性材料、石膏及び
混合材からなることにより水中にカルシウムイオンやア
ルカリオインを溶出して、pHを上昇させる材料が極め
て少なく、更にアルミニウム化合物に富む水硬性材料に
より有害な重金属を固定し易いという優れた効果を奏す
るものである。また、本発明に用いられる混合材は、高
炉スラグ、石炭灰が用いられ、更に両者の混合物を用い
ることもできる。ここに用いられる高炉スラグや石炭灰
は、産業副産物であり、これらを有効利用することは、
地球環境保全に資するところが極めて大きい。また、そ
の潜在水硬性により処理土の強度を向上させることがで
きる。
Hereinafter, the present invention will be described in more detail.
The gist of the present invention is that the solidifying material for soil improvement of the present invention is a hydraulic material rich in an aluminum compound, is composed of gypsum and a mixed material, and elutes calcium ions and alkali olein into water to adjust the pH. The material has an excellent effect that the amount of material to be raised is extremely small, and a harmful heavy metal is easily fixed by a hydraulic material rich in an aluminum compound. Further, blast furnace slag and coal ash are used as the mixed material used in the present invention, and a mixture of both can also be used. The blast furnace slag and coal ash used here are industrial by-products.
The area that contributes to global environmental protection is extremely large. Further, the strength of the treated soil can be improved by its latent hydraulic property.

【0009】本発明に用いられるアルミニウム化合物に
富む水硬性材料がアルミナセメント、水酸化アルミニウ
ム、アウインあるいはハイアルミナスラグから選択され
ることにより、エトリンガイトの生成量が増加し、その
結果有害な重金属を固定し易くする。更に本発明におい
て、石膏が無水石膏である場合、無水石膏刺激剤及び/
又は混合材の刺激剤を加えることを必須の構成要件とな
り、これにより無水石膏が水と結合して二水石膏とな
り、その結果改良土の強度発現性が良好になり、更に石
膏が半水石膏である場合には、混合材の刺激剤を加える
ことにより、同様に改良土の強度発現性が改善されると
いう効果を奏するものである。
When the hydraulic material rich in the aluminum compound used in the present invention is selected from alumina cement, aluminum hydroxide, auin or high alumina slag, the amount of ettringite produced increases, and as a result, harmful heavy metals are fixed. Make it easier. Further, in the present invention, when the gypsum is anhydrous gypsum, the anhydrous gypsum stimulant and / or
Or it becomes an essential constituent requirement to add a stimulant of the mixture material, whereby anhydrous gypsum combines with water to form dihydrate gypsum, resulting in improved strength development of the improved soil, and gypsum becomes hemihydrate gypsum In the case of, by adding the stimulant of the mixed material, the effect of similarly improving the strength development of the improved soil is exhibited.

【0010】[0010]

【発明の実施の形態】以下に、本発明の実施の形態を説
明するが、本発明は、これらのものに限定されるもので
はない。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.

【0011】本発明の土質改良用固化材は、アルミニウ
ム化合物に富む水硬性材料、石膏及び混合材からなるこ
とを特徴とするが、アルミニウム化合物に富む水硬性材
料としては、アルミナが20%以上含む水硬性材料が好
ましく、例えば、アルミナセメント、水酸化アルミニウ
ム、アウイン、ハイアルミナスラグ等が挙げられる。こ
れらは単独でも混合してでも用いることができるが、単
独で用いても効果は十分発揮できるものである。また石
膏としては、無水石膏、半水石膏が用いられる。本発明
に用いられる無水石膏は、二水石膏の焼成物、天然産
物、産業副産物のいずれも使用できるが、二水石膏を加
熱して無水石膏にする場合でも、1000℃以上に加熱
する必要がなく、セメントや生石灰より製造時の熱消費
量は少ない。しかも二水石膏を500℃〜1000℃で
焼成したものが硬化物の強度発現性の面から望ましい。
この場合、無水石膏に天然産品や副産品を使用すれば、
製造工程で熱エネルギーを必要としない。したがって省
エネルギー型のセメントということができる。さらに、
副産物である無水石膏、高炉スラグや石炭灰を有効利用
でき、地球環境保全に資するところが極めて大きい材料
である。
The solidification material for soil improvement according to the present invention is characterized by comprising a hydraulic material rich in an aluminum compound, gypsum and a mixed material. The hydraulic material rich in an aluminum compound contains 20% or more of alumina. Hydraulic materials are preferred, for example, alumina cement, aluminum hydroxide, hauin, high alumina slag and the like. These can be used alone or as a mixture, but the effects can be sufficiently exerted even when used alone. As the gypsum, anhydrous gypsum and hemihydrate gypsum are used. The anhydrous gypsum used in the present invention can be used as a calcined product of gypsum, a natural product, or an industrial by-product, but even when heating gypsum to form anhydrous gypsum, it is necessary to heat it to 1000 ° C. or more. And less heat consumption during production than cement or quicklime. In addition, calcined dihydrate gypsum at 500 ° C. to 1000 ° C. is desirable from the viewpoint of developing strength of the cured product.
In this case, if you use natural products or by-products in anhydrous gypsum,
No thermal energy is required in the manufacturing process. Therefore, it can be called an energy-saving cement. further,
Anhydrous gypsum, blast furnace slag, and coal ash, which are by-products, can be used effectively, and it is an extremely large material that contributes to global environmental conservation.

【0012】本発明に用いられる半水石膏は、二水石膏
の焼成物、水熱処理物、天然産品又は副産品のいずれも
使用できる。また使用される半水石膏は、特に純度10
0%のものを用いる必要はなく、無水石膏、二水石膏、
粘土鉱物などの不純物が内割で10重量%以内で混入さ
れていてもよく、これにより所要の性能が実質的に落ち
ることがないので、通常は不純物の混入したものが用い
られる。本発明では固化材の主成分のひとつとして半水
石膏を用いることにあり、その結果、原料の二水石膏を
加熱して半水石膏にする場合でも、製造に際し、熱消費
量が少なく安価に生成することができ、また副産品であ
る二水石膏を使用する等により地球環境保全に資すると
ころが極めて大きいという利点がある。即ち二水石膏を
加熱して半水石膏にする場合でも、200℃以上に加熱
する必要がなく、セメントや生石灰より製造時の熱消費
量は極めて少ない。したがって省エネルギー型のセメン
トということができる。さらに、副産物である高炉スラ
グや石炭灰を有効利用でき、地球環境保全に資するとこ
ろが極めて大きい材料である。
As the hemihydrate gypsum used in the present invention, any of calcined dihydrate gypsum, hydrothermally treated product, natural product and by-product can be used. Also, the hemihydrate gypsum used is particularly pure 10
It is not necessary to use 0%, anhydrous gypsum, dihydrate gypsum,
Impurities such as clay minerals may be mixed in within 10% by weight of the content, and the required performance is not substantially reduced. Therefore, usually, impurities mixed are used. In the present invention, there is a use of hemihydrate gypsum as one of the main components of the solidifying material. As a result, even when heating the dihydrate gypsum as a raw material to make hemihydrate gypsum, in production, heat consumption is low and inexpensive. There is an advantage that the use of gypsum, which is a by-product, contributes greatly to global environmental conservation by using gypsum. That is, even when gypsum is heated to form hemihydrate gypsum, it is not necessary to heat it to 200 ° C. or higher, and the heat consumption during production is extremely smaller than that of cement or quicklime. Therefore, it can be called an energy-saving cement. In addition, blast furnace slag and coal ash, which are by-products, can be effectively used, and are extremely large materials that contribute to global environmental protection.

【0013】本発明に用いられる混合材は、産業副産物
を有効利用できることの他、その潜在水硬性により処理
土の強度を向上させることができる。高炉スラグ、石炭
灰が用いられ、更に両者の混合物を用いることもでき
る。その他に、該混合材にシリカフューム、火山灰、石
灰石粉末も混合材として併用できる。本発明において
は、土質改良用固化材は、以上の材料を混合して使用し
ても良いが、改良土質の強度の発現性を増すには、調合
した材料を混合粉砕し、しかも粒子径を小さくするほど
良い。本発明の土質改良用固化材は、土壌、ヘドロ、焼
却灰、建設残土、建設汚泥、ピート、泥炭土等の土質物
が固化処理でき、得られた処理土は植生に適し、耐酸性
と長期的な耐久性が付与される。ここで建設汚泥は、浚
渫以外の工事等に係わる掘削工事に伴って排出されるも
ののうち、標準ダンプトラックに山積みできず、またそ
の上を人が歩かない状態のもの(コーン指数がおおむね
2以下または一軸圧縮強さが0.5kgf/cm2
下)を建設汚泥といい、廃棄物処理法で規定する産業廃
棄物の汚泥に該当するものである。
[0013] The mixed material used in the present invention can improve the strength of the treated soil due to its potential hydraulic property, in addition to being able to effectively utilize industrial by-products. Blast furnace slag and coal ash are used, and a mixture of both can also be used. In addition, silica fume, volcanic ash, and limestone powder can be used in combination with the mixture. In the present invention, the solidifying material for soil improvement may be used by mixing the above materials.However, in order to increase the manifestation of the strength of the improved soil, the prepared materials are mixed and pulverized, and the particle size is reduced. The smaller the better. The solidifying material for soil improvement of the present invention can solidify soil, sludge, incineration ash, construction residual soil, construction sludge, peat, peat soil, and the like, and the obtained treated soil is suitable for vegetation, acid resistance and long term Durability is provided. Here, construction sludge, which is discharged along with excavation work related to construction other than dredging, cannot be piled up on a standard dump truck and is in a state where no person can walk on it (cone index is generally 2 or less) Or, the uniaxial compressive strength is 0.5 kgf / cm 2 or less) is referred to as construction sludge, which corresponds to the sludge of industrial waste specified by the Waste Management Law.

【0014】本発明において、石膏が無水石膏である場
合には、無水石膏刺激剤及び/又は混合材の刺激剤を加
えることが必須の構成要件となるが、半水石膏の場合
に、この無水石膏刺激剤及び/又は混合材の刺激剤を加
えることこともできる。無水石膏刺激剤としては、無水
石膏を硬化を促進する作用を有し、無水石膏刺激剤とし
ては、硫酸カリ、明バンなどの硫酸塩、硫酸水素ナトリ
ウムなどの硫酸水素塩、硝酸アンモニウムなどの硝酸塩
が好ましく用いられる。これらの中で特に望ましい材料
は、カリ明バンや硫酸アルカリであるが、このカリ明バ
ンや硫酸アルカリの場合は、添加量が多くなると白華が
目立つようになるので、添加量は5%以下が好ましい。
また混合材の刺激剤としては、セメント、生石灰、消石
灰等が挙げられ、これらの1種類以上の組合せからな
る。
In the present invention, when the gypsum is anhydrous gypsum, it is essential to add an anhydrous gypsum stimulant and / or a mixture stimulant. Gypsum stimulants and / or admixture stimulants can also be added. As an anhydrous gypsum stimulant, it has an effect of accelerating the curing of anhydrous gypsum, and as an anhydrous gypsum stimulant, sulfates such as potassium sulfate and meiban, hydrogen sulfates such as sodium hydrogen sulfate, and nitrates such as ammonium nitrate. It is preferably used. Of these, particularly desirable materials are potassium lime ban and alkali sulfate. In the case of potassium lime ban and alkali sulfate, when the amount of addition is large, efflorescence becomes noticeable. Is preferred.
Examples of the stimulant for the mixture include cement, quicklime, slaked lime, and the like, and are composed of a combination of one or more of these.

【0015】また、本発明の土質改良用固化材を使用す
る際には、必要に応じて、ナフタリン系、メラミン系、
ポリカルボン酸系、精製リグニン系などの分散性を増す
ための混和剤、樹脂石鹸、ポリオキシエチレン、アルキ
ルアリルサルフェート、ドデシルベンゼンスルフォン酸
塩などの界面活性剤、防水剤、防凍剤、防錆剤、エフロ
防止剤、急結剤等のこの技術分野において通常用いられ
る添加剤を適宜混合して使用することができる。
When the solidification material for soil improvement of the present invention is used, a naphthalene-based, melamine-based,
Additives to increase dispersibility of polycarboxylic acids, purified lignins, etc., resin soaps, surfactants such as polyoxyethylene, alkyl allyl sulfate, dodecylbenzene sulfonate, waterproofing agents, antifreezing agents, rust inhibitors Additives commonly used in this technical field, such as anti-fouling agents, quick-setting agents, etc., can be used as appropriate.

【0016】〔作用〕1)本発明の土質改良用固化材の
硬化機構は、半水石膏が二水石膏に復元する際に、硬化
するもので、第一段階で半水石膏が水和して二水石膏を
生成し、この際吸水して硬化する。更に第二段階で高炉
スラグなどの混和材、土壌、ヘドロ、焼却灰、建設汚泥
などが、二水石膏、セメント、生石灰、消石灰と水和反
応(ポゾラン反応)することにより、徐々に硬化すると
いう、いわゆる二段階の反応が基本となる。
[Action] 1) The hardening mechanism of the solidified material for soil improvement of the present invention is that when hemihydrate gypsum is restored to gypsum, it is hydrated in the first stage. To produce gypsum, which absorbs water and hardens. Furthermore, in the second stage, admixtures such as blast furnace slag, soil, sludge, incinerated ash, construction sludge, etc. gradually harden due to a hydration reaction (pozzolanic reaction) with gypsum, cement, quicklime, slaked lime. A so-called two-stage reaction is fundamental.

【0017】2)本発明の土質改良用固化材の硬化機構
は、本来水和の極めて遅い無水石膏を用いたもので、こ
の無水石膏の水和による硬化を促進するために、第一段
階で無水石膏刺激剤を添加するとその硬化促進作用によ
り二水石膏に復元する過程で吸水し、短時間に水和して
硬化する。更に第二段階で高炉スラグなどの混和材の刺
激剤が、無水石膏、二水石膏、セメント、生石灰、消石
灰と水和反応(ポゾラン反応)することにより、徐々に
硬化するという、いわゆる二段階の反応が基本となる。
2) The hardening mechanism of the solidification material for soil improvement according to the present invention is based on the use of anhydrous gypsum which is originally extremely slow in hydration. When an anhydrous gypsum stimulant is added, it absorbs water in the process of restoring to gypsum due to its hardening promoting action, and hydrates and hardens in a short time. Further, in the second step, the stimulant of the admixture such as blast furnace slag is gradually hardened by a hydration reaction (pozzolan reaction) with anhydrous gypsum, gypsum, cement, quicklime, slaked lime, so-called two-stage. Reaction is the basis.

【0018】3)アルミニウム化合物に富む水硬性材料
を加えることにより、エトリンガイトの生成量が増すこ
とにより有害な重金属を固定する能力を増すことができ
ると共に、改良土の強度発現性が良い。
3) By adding a hydraulic material rich in an aluminum compound, the ability to fix harmful heavy metals can be increased by increasing the amount of ettringite produced, and the improved soil has good strength development.

【0019】4)本発明の土質改良用固化材の成分構成
にしたことにより、ポルトランダイトが生成しないかあ
るいは少ないことから、酸に溶解するカルシウムが極め
て少量であるため、溶出カルシウム分の再結晶化により
排水路を閉塞するなどの問題も発生しない。
4) Since the component composition of the solidification material for soil improvement of the present invention does not produce or reduce portlandite, the amount of calcium dissolved in the acid is extremely small. There is no problem such as blockage of the drainage channel due to crystallization.

【0020】5)本発明に用いられる石膏は、凍結しな
い限り、低温の場合ほど水和が進むので、強度発現性に
優れ、硬化時間も早い。したがって、冬期や寒冷地の土
壌改良工事にも適する材料となる。
5) As long as the gypsum used in the present invention is not frozen, hydration proceeds at a lower temperature, the strength is excellent and the setting time is short. Therefore, it is a material suitable for soil improvement work in winter and cold regions.

【0021】6)本発明の固化材で建設汚泥を固化処理
すると、コーン指数がおおむね2以上または一軸圧縮強
さが0.5kgf/cm2 以上となる。また、改良土か
らの溶出水のpHが中性に近くなり、排水基準の許容限
度のpH5.8〜8.6(海域では5.0〜9.0)内
になりやすい。このように生活環境の保全上支障を生じ
なくなり、埋戻材料等として再利用することができる。
6) When the construction sludge is solidified with the solidification material of the present invention, the cone index becomes approximately 2 or more or the uniaxial compressive strength becomes 0.5 kgf / cm 2 or more. In addition, the pH of the leaching water from the improved soil is close to neutral, and the pH tends to be within the allowable limit of the drainage standard, 5.8 to 8.6 (5.0 to 9.0 in the sea area). In this way, there is no problem in preserving the living environment, and it can be reused as a backfill material or the like.

【0022】[0022]

【実施例】以下に、本発明を実施例により更に具体的に
説明するが、本発明は、これらの例によって限定される
ものではない。
EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

【0023】〔実施例1〕対象土として、6価クロムを
50ppm含有する(含水比37.0%、単位体積重量
1.808g/cm2 )を使用した。固化材には、副産
の無水石膏の1000℃での加熱物、半水石膏、無水カ
リミョウバン(和光純薬工業(株)製、硫酸アルミニウ
ムカリウム)、高炉スラグ(三菱マテリアル(株)製、
ブレーン値5950cm2 /g)及び土木用のアルミナ
セメント(旭硝子(株)製)を使用した。表1に示す材
料配合の固化材を、湿潤土に対して5%添加し、ホバー
ト型ミキサーで10分間混合した後、振動を与えながら
直径5cm、高さ10cmのモールドに詰めた。材令7
日と28日に改良土のpH測定(JSFT7による)、
処理土の一軸圧縮試験(JIS A1216による)及
び6価クロムの溶出量の測定(環境庁告示第46号に掲
げる方法による)を行った。なお、供試体は、20±3
℃の恒温室内で養生した。比較用の固化材として、三菱
マテリアル(株)製のセメント系固化材「スタビライト
15」を用いた。試験結果を表2に示す。本発明の固化
材により処理した植生土は,セメント系固化材による処
理土よりpHが低い。また一軸圧縮強度の発現性にも問
題がない。6価クロムの溶出量は、極めて低い。
Example 1 A soil containing 50 ppm of hexavalent chromium (water content: 37.0%, unit volume weight: 1.808 g / cm 2 ) was used as a target soil. Examples of the solidifying material include by-products of dried gypsum heated at 1000 ° C., hemihydrate gypsum, anhydrous potassium alum (Wako Pure Chemical Industries, Ltd., aluminum potassium sulfate), blast furnace slag (Mitsubishi Materials Corporation),
Alumina cement (manufactured by Asahi Glass Co., Ltd.) for civil engineering was used (Brain value: 5950 cm 2 / g). 5% of the solidified material having the material composition shown in Table 1 was added to the wet soil, mixed for 10 minutes by a Hobart mixer, and then packed into a mold having a diameter of 5 cm and a height of 10 cm while applying vibration. Material age 7
On the 28th and 28th, pH measurement of the improved soil (according to JSFT7),
A uniaxial compression test of the treated soil (according to JIS A1216) and a measurement of the elution amount of hexavalent chromium (according to the method set forth in Notification of the Environment Agency No. 46) were performed. The specimen is 20 ± 3
Cured in a constant temperature room at ℃. As a solidifying material for comparison, a cement-based solidifying material “Stabilite 15” manufactured by Mitsubishi Materials Corporation was used. Table 2 shows the test results. The vegetation soil treated with the solidified material of the present invention has a lower pH than the soil treated with the cement-based solidified material. Also, there is no problem in the development of uniaxial compressive strength. The elution amount of hexavalent chromium is extremely low.

【0024】[0024]

【表1】 [Table 1]

【0025】[0025]

【表2】 [Table 2]

【0026】〔実施例2〕対象土として、砂質粘土(含
水比33.0%、単位体積重量1.816g/cm3
を使用した。固化材には、副産の無水石膏の500℃で
の加熱物、硝酸アンモニウム(和光純薬工業(株)製、
試薬特級)、フライアッシュ(松島火力産、ブレーン値
3080cm2 /g)を使用した。表3に示す材料配合
の固化材を示す。固化材を、湿潤土に対して5%添加
し、ホバート型ミキサーで10分間混合した。これを植
生箱に投入し、締固めには、2.5kgのランマーを用
いた。材令7日の時点で、百日草とおくらの種を蒔き、
その後散水と追肥を適宜行い、2ヶ月後までの生育の状
況を観察した。さらに材令7日と28日に植生土のpH
測定(JSF T7による)および処理土の一軸圧縮試
験(JISA1216による)を行った。なお、一軸圧
縮強度試験には、直径5cm、高さ10cmのモールド
を用いて、植生土と同じ締固め度になるように供試体を
作製し、20±3℃の恒温室内で養生して用いた。比較
用の固化材として、三菱マテリアル(株)製のセメント
系固化材「スタビライトM15」を用いた。試験結果を
表4に示す。本発明の固化材により処理した植生土は、
セメント系固化材による処理土よりpHが低くて中性に
近く、植物の成育が良好である。また一軸圧縮強度の発
現性にも問題がない。
[Example 2] Sandy clay (water content: 33.0%, unit volume weight: 1.816 g / cm 3 ) was used as the target soil.
It was used. Examples of the solidifying material include a heated product of by-product anhydrous gypsum at 500 ° C., ammonium nitrate (manufactured by Wako Pure Chemical Industries, Ltd.,
Special reagent grade) and fly ash (Matsushima Thermal Power Co., Brain value: 3080 cm 2 / g) were used. The solidified material having the material composition shown in Table 3 is shown. The solidified material was added at 5% to the wet soil and mixed for 10 minutes with a Hobart mixer. This was put into a vegetation box, and a 2.5 kg rammer was used for compaction. On the seventh day of the timber age, sowed perennial and sow seeds,
Thereafter, watering and topdressing were performed as appropriate, and the state of growth up to two months later was observed. In addition, the pH of the vegetation soil was determined on the 7th and 28th of the timber age.
A measurement (according to JSF T7) and a uniaxial compression test of treated soil (according to JISA1216) were performed. For the uniaxial compressive strength test, a test specimen was prepared using a mold with a diameter of 5 cm and a height of 10 cm so as to have the same compaction degree as the vegetation soil, and cured in a constant temperature room at 20 ± 3 ° C. Was. As a solidifying material for comparison, a cement-based solidifying material “Stabilite M15” manufactured by Mitsubishi Materials Corporation was used. Table 4 shows the test results. Vegetation soil treated with the solidifying material of the present invention is:
The pH is lower than that of the soil treated with the cement-based solidifying material, which is near neutral, and the growth of the plant is good. Also, there is no problem in the development of uniaxial compressive strength.

【0027】[0027]

【表3】 [Table 3]

【0028】[0028]

【表4】 [Table 4]

【0029】[0029]

【発明の効果】本発明の土質改良用固化材は、アルミニ
ウムに富む水硬性材料を加えたことにより、重金属の固
定がし易いばかりか強度発現性が良好であるので、重金
属に汚染された土の改良に好ましく用いられ、また処理
直後でも中性に近いため、植物の成育にも適し、処理土
から溶出する水のpHが中性に近いため生活環境を保全
することができるという優れた効果を奏する。また溶出
カルシウム分の再結晶化による排水路を閉塞することが
ないという優れた効果を奏するものである。
The solidification material for soil improvement according to the present invention is not only easy to fix heavy metals but also has good strength development by adding a hydraulic material rich in aluminum. It is preferably used for the improvement of water quality, and is almost neutral even immediately after treatment, so it is suitable for growing plants. The excellent effect of preserving the living environment because the pH of water eluted from the treated soil is nearly neutral. To play. Further, the present invention has an excellent effect that the drainage channel due to recrystallization of the eluted calcium is not blocked.

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

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】アルミニウム化合物に富む水硬性材料、石
膏及び混合材からなる土質改良用固化材。
1. A soil hardening material comprising a hydraulic material, gypsum and a mixture rich in an aluminum compound.
【請求項2】混合材が高炉スラグ又は石炭灰であるかあ
るいは両者の組合せであることを特徴とする請求項1に
記載の土質改良用固化材。
2. The solidified material for improving soil properties according to claim 1, wherein the mixed material is blast furnace slag or coal ash, or a combination of both.
【請求項3】水硬性材料がアルミナセメント、水酸化ア
ルミニウム、アウインあるいはハイアルミナスラグから
選択されることを特徴とする請求項1又は請求項2に記
載の土質改良用固化材。
3. The solidified material for improving soil quality according to claim 1, wherein the hydraulic material is selected from alumina cement, aluminum hydroxide, autoin and high alumina slag.
【請求項4】石膏が無水石膏である場合、無水石膏刺激
剤及び/又は混合材の刺激剤を加えることを特徴とする
請求項1乃至請求項3のいずれかに記載の土質改良用固
化材。
4. The solidifying material for improving soil according to claim 1, wherein, when the gypsum is anhydrous gypsum, an anhydrous gypsum stimulant and / or a stimulant of a mixed material are added. .
【請求項5】石膏が半水石膏である場合、混合材の刺激
剤を加えることを特徴とする請求項1乃至請求項3のい
ずれかに記載の土質改良用固化材。
5. The solidified material for improving soil properties according to claim 1, wherein when the gypsum is hemihydrate gypsum, a stimulant of a mixed material is added.
JP9015126A 1997-01-29 1997-01-29 Solidifying material for soil improvement Withdrawn JPH10212479A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9015126A JPH10212479A (en) 1997-01-29 1997-01-29 Solidifying material for soil improvement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9015126A JPH10212479A (en) 1997-01-29 1997-01-29 Solidifying material for soil improvement

Publications (1)

Publication Number Publication Date
JPH10212479A true JPH10212479A (en) 1998-08-11

Family

ID=11880140

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9015126A Withdrawn JPH10212479A (en) 1997-01-29 1997-01-29 Solidifying material for soil improvement

Country Status (1)

Country Link
JP (1) JPH10212479A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001288468A (en) * 2000-04-03 2001-10-16 Denki Kagaku Kogyo Kk Soil solidifying composition for vegetation
KR100563975B1 (en) * 2003-03-12 2006-03-29 공주대학교 산학협력단 The components of the ground-strengthening material for the repairing the ground sinking of cultural assets and the manufacturing method thereof
JP2007138102A (en) * 2005-11-22 2007-06-07 Mitsubishi Materials Corp Solidification agent for soil remediation
JP2009051910A (en) * 2007-08-24 2009-03-12 Tachibana Material Co Ltd Gypsum-based solidification material and additive for gypsum-based solidification material
JP2016125031A (en) * 2015-01-08 2016-07-11 株式会社トクヤマ Method for effectively utilizing coal ash
CN113185236A (en) * 2021-06-09 2021-07-30 中铁二十局集团第五工程有限公司 Method for chemically improving lake-facies peat soil and application

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001288468A (en) * 2000-04-03 2001-10-16 Denki Kagaku Kogyo Kk Soil solidifying composition for vegetation
KR100563975B1 (en) * 2003-03-12 2006-03-29 공주대학교 산학협력단 The components of the ground-strengthening material for the repairing the ground sinking of cultural assets and the manufacturing method thereof
JP2007138102A (en) * 2005-11-22 2007-06-07 Mitsubishi Materials Corp Solidification agent for soil remediation
JP2009051910A (en) * 2007-08-24 2009-03-12 Tachibana Material Co Ltd Gypsum-based solidification material and additive for gypsum-based solidification material
JP2016125031A (en) * 2015-01-08 2016-07-11 株式会社トクヤマ Method for effectively utilizing coal ash
CN113185236A (en) * 2021-06-09 2021-07-30 中铁二十局集团第五工程有限公司 Method for chemically improving lake-facies peat soil and application

Similar Documents

Publication Publication Date Title
KR100876222B1 (en) The solidifying agent composition for softground improvement
KR20020093204A (en) Solidificator Manufacturing Method with Waste Oyster Shell
KR101564560B1 (en) Eco neutral ground For improvements firming agent Production method and construction method
JP2000086322A (en) Hexavalent chromium leach reducing agent for hydraulic material, and method for reducing hexavalent chromium leach
JP4607149B2 (en) Cement admixture and cement composition
JPH08311446A (en) Solidifier for soil conditioning
KR102454865B1 (en) Eco-friendly grout material composition for water-impermeable reinforcement of ground using inorganic accelerator and zero-cement biner
KR100431797B1 (en) Non-sintering cement using blast furnace slag
JP2002363560A (en) Soil-aggregative caking agent for improvement of highly hydrous soft soil
JP2002097057A (en) Injection material for lowering hexavalent chromium
JP2003034562A (en) Hydraulic composition and hydrated hardened body
JPH10212479A (en) Solidifying material for soil improvement
JP5565123B2 (en) Additive for cement-based solidifying material and method for improving volcanic ash soil using the additive
KR100375407B1 (en) method of manufacturing solity for preventing heavy metals from being occurred in wastes and solity manufactured by the same
JPH08302346A (en) Solidifier for soil conditioning
JPH1025476A (en) Cement composition for hardening ground or the like
KR0125466B1 (en) Soil stabilizer and process thereof
KR100497422B1 (en) The Manufacturing Method and The Soil Stabilizer Improving High Water Content-Soft Ground Reusong Industrial Discharge and Ocean Waste
JP2004292568A (en) Soil solidifying material
JPH10225669A (en) Low alkali solidifying material
KR0118631B1 (en) High Strength Hardener Composition
JPH10245555A (en) Cemental solidifier for organic soil
JPH1135939A (en) Quickly curing soil conditioner
KR20090070263A (en) Environmental friendly soil stabilizer
JPH11278911A (en) Solidifying material

Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20040406