JPH07278541A - Method for pollution-free treatment of improved soil and pollution free improved soil - Google Patents
Method for pollution-free treatment of improved soil and pollution free improved soilInfo
- Publication number
- JPH07278541A JPH07278541A JP6068779A JP6877994A JPH07278541A JP H07278541 A JPH07278541 A JP H07278541A JP 6068779 A JP6068779 A JP 6068779A JP 6877994 A JP6877994 A JP 6877994A JP H07278541 A JPH07278541 A JP H07278541A
- Authority
- JP
- Japan
- Prior art keywords
- soil
- improved soil
- improved
- cement
- pollution
- 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.)
- Granted
Links
- 239000002689 soil Substances 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims description 17
- 239000000463 material Substances 0.000 claims abstract description 43
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000004568 cement Substances 0.000 claims abstract description 20
- 239000000292 calcium oxide Substances 0.000 claims abstract description 16
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 16
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 41
- 239000001569 carbon dioxide Substances 0.000 claims description 19
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 19
- 238000009412 basement excavation Methods 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract description 11
- 239000000920 calcium hydroxide Substances 0.000 abstract description 11
- 235000011116 calcium hydroxide Nutrition 0.000 abstract description 11
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract description 2
- 235000010216 calcium carbonate Nutrition 0.000 abstract 1
- 238000006386 neutralization reaction Methods 0.000 description 12
- 238000001784 detoxification Methods 0.000 description 6
- 239000011575 calcium Substances 0.000 description 5
- 230000003472 neutralizing effect Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000003673 groundwater Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 235000011089 carbon dioxide Nutrition 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002440 industrial waste Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003113 alkalizing effect Effects 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 etc. Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000021962 pH elevation Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D3/00—Calcareous fertilisers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、改良土の無害化処理方
法と該無害化処理方法で得られる無害化改良土に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detoxifying improved soil and a detoxified improved soil obtained by the detoxification method.
【０００２】[0002]
【従来の技術】建設現場において、地盤の掘削工事によ
り発生する土の中で、砂質土は締固めができるため、そ
のまま再利用が可能である。しかし、粘性土は締固めて
も柔らかいままで、そのままでは再利用できないため、
残土として埋立処分されている。しかし、埋立処分の用
地の確保が難しく、残土の有効利用を促進しなければな
らない状況である。そこで残土に生石灰やセメントなど
を添加・混合してその土質性状を改善した改良土を埋戻
し材や盛土材として有効利用する方法が開発され、実用
化段階にある。2. Description of the Related Art At a construction site, sandy soil can be reused as it is because it can be compacted in the soil produced by excavation work of the ground. However, cohesive soil remains soft even if compacted and cannot be reused as it is.
It has been landfilled as surplus soil. However, it is difficult to secure land for landfill disposal, and it is necessary to promote the effective use of the remaining soil. Therefore, a method of adding and mixing quick lime, cement, etc. to the residual soil to effectively use the improved soil with improved soil properties as a backfill material and embankment material has been developed and is in the stage of practical application.
【０００３】[0003]
【発明が解決しようとする課題】しかし、改良土にする
ために、残土に生石灰やセメントを加えると、土と生石
灰やセメントの反応により水酸化カルシウムが生成され
る。残土に生石灰を添加する場合には次式（１）のよう
な反応が進む。 ＣａＯ＋Ｈ2Ｏ（土中）→Ｃａ（ＯＨ）2 （１） 水酸化カルシウムを含んだまま、残土の改良土を埋戻し
材や盛土材として利用する場合に、埋戻し材や盛土材が
地下水と接すると、地下水は汚染され、ｐＨ値が高いア
ルカリ性となるので、改良土を使用できる場所が限定さ
れてしまうことがあった。そこで、本発明は二次公害の
おそれのない状態にして使用できるような改良土を提供
し、改良土の利用範囲を高め、ひいては残土の有効利用
を促進することを目的とする。また、本発明は埋戻し材
や盛土材として使用できる改良土を提供することを目的
とする。However, when quicklime or cement is added to the residual soil to improve the soil, calcium hydroxide is produced by the reaction of the soil with the quicklime or cement. When quicklime is added to the residual soil, the reaction shown in the following equation (1) proceeds. CaO + H 2 O (in soil) → Ca (OH) 2 (1) When the improved soil of the residual soil is used as backfill material or embankment material while containing calcium hydroxide, the backfill material and embankment material are used as groundwater. Upon contact, the groundwater is polluted and becomes alkaline with a high pH value, which may limit the places where the improved soil can be used. Therefore, an object of the present invention is to provide improved soil that can be used in a state where there is no risk of secondary pollution, increase the range of utilization of the improved soil, and, in turn, promote effective utilization of the residual soil. Another object of the present invention is to provide an improved soil that can be used as a backfill material or an embankment material.
【０００４】[0004]
【課題を解決するための手段】本発明の上記目的は次の
構成によって達成される。すなわち、土と生石灰、セメ
ント、石灰系材料またはセメント系材料を混合して得ら
れた改良土を二酸化炭素で加圧処理する改良土の無害化
処理方法、または土と生石灰、セメント、石灰系材料ま
たはセメント系材料を混合して得られた改良土を二酸化
炭素で加圧処理して製造される無害化改良土、または掘
削により掘り出された残土改良土または地盤改良土を二
酸化炭素で加圧処理して製造される無害化改良土であ
る。本発明の無公害化処理方法が適用される種類の異な
る改良土について説明する。The above objects of the present invention can be achieved by the following constitutions. That is, a method for detoxifying the improved soil by pressurizing the improved soil obtained by mixing soil and quick lime, cement, lime-based material or cement-based material, or soil and quick lime, cement, lime-based material Or, detoxified improved soil produced by pressurizing improved soil obtained by mixing cementitious materials with carbon dioxide, or residual soil improved soil excavated by excavation or ground improved soil is pressurized with carbon dioxide. It is detoxified improved soil produced by processing. Different types of improved soil to which the pollution-free processing method of the present invention is applied will be described.
【０００５】（１）残土改良土 残土を埋戻し材、盛土材等として再利用するために生石
灰、セメント、生石灰や消石灰を主体とする石灰系材
料、セメントを主体とするセメント系材料等により残土
の性状を改善した改良土について、二酸化炭素の加圧処
理による中性化処理により無害化を図ることができる。
残土と前記生石灰、セメント、石灰系材料またはセメン
ト系材料等の所定量を混合後、改良土としての必要な性
状すなわち埋戻し材や盛土材としてのハンドリング性状
および締固め後の強度が地山なみとなる強度性状が現れ
た後、言い換えると、必要な性状が現れるまでの材令経
過後に、二酸化炭素を加圧して添加し、改良土の粒子内
部まで二酸化炭素を強制充填する。改良土中には消石灰
Ｃａ（ＯＨ）2が残存するために、改良土はアルカリ性
を示す。そこで二酸化炭素を改良土に添加することがで
きると二酸化炭素と消石灰の化学反応により、改良土中
の消石灰を難溶性の炭酸カルシウムＣａＣＯ3に変化さ
せて強度等の性状を低下させることなく中性化させるこ
とができる。中性化された改良土は埋戻し材、盛土材等
として再利用するために必要なハンドリング性および強
度等の性状は、中性化処理しない改良土と同等である。
さらに、中性化された改良土は中性であるために、従来
のような地下水のアルカリ性化に対する対策が不要にな
り安全性が確実で、安心して使用することができる。(1) Residual soil improvement soil In order to reuse the residual soil as backfill material, embankment material, etc. The improved soil having improved properties can be rendered harmless by the neutralization treatment by the carbon dioxide pressure treatment.
After mixing a certain amount of residual soil with the above-mentioned quick lime, cement, lime-based material or cement-based material, the necessary properties as improved soil, that is, the handling properties as a backfill material or embankment material and the strength after compaction are generally smooth. After the appearance of the strength property, that is, in other words, after the elapse of the age until the required property appears, carbon dioxide is pressurized and added, and the carbon dioxide is forcibly filled even inside the particles of the improved soil. Since the slaked lime Ca (OH) 2 remains in the improved soil, the improved soil is alkaline. Therefore, if carbon dioxide can be added to the improved soil, the chemical reaction between carbon dioxide and slaked lime will change the slaked lime in the improved soil into the sparingly soluble calcium carbonate CaCO 3 and neutralize the properties such as strength. Can be transformed. The properties such as the handling property and the strength required for reusing the neutralized improved soil as a backfill material, embankment material, etc. are the same as those of the non-neutralized improved soil.
Furthermore, since the neutralized improved soil is neutral, the conventional measures against alkalinization of groundwater are not required, and the safety is assured and it can be used with confidence.
【０００６】（２）掘削により掘り出された残土改良土
の再利用 一般に、残土改良土はアルカリ性であるために、処分上
残土として扱われず、産業廃棄物として扱われている。
しかし、残土改良土を埋戻し材、盛土材等に利用した後
で、掘削し、再度埋戻し材、盛土材等に利用する場合
も、二酸化炭素を加圧して添加し、改良土の粒子内部ま
で二酸化炭素を充填し、中性化させ無害化を図ることが
できる。こうして、中性化処理した残土改良土は、無害
性の埋戻し材、盛土材等として再利用が可能である。ま
た、中性化処理した残土改良土を再利用せずに埋立処分
する場合にも残土と同様に扱うことができるので産業廃
棄物としての処分に比べて扱いが簡略化でき、コストダ
ウンも図れるという利点がある。(2) Reuse of Residual Soil Improved Soil Excavated by Excavation Generally, the soil improved soil is alkaline and therefore is not treated as residual soil for disposal but is treated as industrial waste.
However, when the residual soil-improved soil is used as a backfill material, embankment material, etc. and then excavated and used again as a backfill material, embankment material, etc., carbon dioxide is added under pressure to improve the inside of the improved soil particles. It can be made harmless by filling it with carbon dioxide and neutralizing it. In this way, the residual soil-improved soil that has been neutralized can be reused as a harmless backfill material, embankment material, or the like. In addition, even when the reclaimed soil after the neutralization is reclaimed without being reused, it can be handled in the same way as the remaining soil, so the handling can be simplified and the cost can be reduced compared to the disposal as industrial waste. There is an advantage.
【０００７】（３）掘削により掘り出された地盤改良土
の再利用 残土改良土のほかに、上記の中性化処理方法が地盤改良
土にも適用される。前記生石灰、セメント、石灰系材
料、セメント系材料等を地盤中に吐出し、土と混合し、
地盤中に固結体を築造することによる地盤改良法におい
て、地表部の地盤改良土を所定の深度で切り揃える場
合、固結状態の地盤改良土が排出する。この地盤改良土
はアルカリ性の固結物であるために、一般に処分上残土
として扱われず、産業廃棄物として扱われるものであ
る。しかし、前記地盤改良土を破砕し、これに二酸化炭
素を加圧して添加することにより中性化すると、無害化
処理された残土改良土と同様の扱いが可能となる。また
残土と同様の処分が図れることになる。(3) Reuse of ground-improved soil excavated by excavation In addition to the residual soil-improved soil, the above-described neutralization treatment method is applied to the soil-improved soil. The quicklime, cement, lime material, cement material, etc. are discharged into the ground and mixed with soil,
In the ground improvement method by building a solidified body in the ground, when the ground improved soil on the ground surface is trimmed at a predetermined depth, the solidified soil improved soil is discharged. Since this ground improvement soil is an alkaline solidified matter, it is generally not treated as residual soil for disposal but is treated as industrial waste. However, if the soil-improved soil is crushed and carbon dioxide is added thereto under pressure to neutralize the soil, the soil-improved soil can be treated in the same manner as the detoxified soil-improved soil. In addition, it will be possible to dispose of it like the remaining soil.
【０００８】次に、二酸化炭素を加圧下に改良土に添加
する方法について説明する。 （１）液化二酸化炭素を用いる方法 上記した種類の改良土を容器内に収納し、液化二酸化炭
素タンクから導いた二酸化炭素を容器の中で所定圧力で
所定時間加圧添加する方法である。 （２）ドライアイスを用いる方法 盛土状にした改良土を覆うようにシートでカバーして気
密状態にし、この気密状態のシート内にドライアイスを
配置し、該ドライアイスを気化させて、改良土を中性化
処理する方法である。この方法は土木工事現場で改良土
を無害化処理ができるので、利用性が高い。Next, a method of adding carbon dioxide to the improved soil under pressure will be described. (1) Method using liquefied carbon dioxide This is a method in which the above-mentioned type of improved soil is stored in a container and carbon dioxide introduced from a liquefied carbon dioxide tank is added under pressure at a predetermined pressure for a predetermined time in the container. (2) Method using dry ice The cover is covered with a sheet so as to cover the improved soil that has been made into an embankment to make it airtight, and dry ice is placed in this airtight sheet, and the dry ice is vaporized to make the improved soil. Is a method of neutralizing. This method is highly useful because it can detoxify the improved soil at the civil engineering site.
【０００９】[0009]
【作用】土に例えば生石灰を混ぜると前記（１）式の反
応がまず進行し、消石灰（Ｃａ（ＯＨ）2）が生じる。
また土にセメントを混ぜるとセメントと土の中の水が反
応してセメント水和物が生成し土性状が改善されるが、
水和物の生成とともに消石灰が生じる。次いで、生成し
た消石灰（Ｃａ（ＯＨ）2）と土粒子が化学的に反応
し、さらに土の性状が改善される。土が所定の性状に改
善された後、得られる改良土に二酸化炭素（ ＣＯ2）を
圧力をかけて添加し、粒子の表面及び内部に存在する消
石灰と反応させ、内部までを中性化させる。When the soil is mixed with, for example, quick lime, the reaction of the above formula (1) first proceeds to produce slaked lime (Ca (OH) 2 ).
When cement is mixed with soil, the water in the soil reacts with the cement to produce hydrated cement, which improves the soil properties.
Slaked lime occurs with the formation of hydrates. Next, the generated slaked lime (Ca (OH) 2 ) chemically reacts with the soil particles, and the soil properties are further improved. After the soil has been improved to the desired properties, carbon dioxide (CO 2 ) is added to the obtained improved soil under pressure to react with the slaked lime existing on the surface and inside of the particles to neutralize the inside. .
【００１０】改良土の中性化の反応は次式（２）のよう
に進行する。 Ｃａ（ＯＨ）2 ＋ＣＯ2 → ＣａＣＯ3＋Ｈ2Ｏ （２） 加圧下にＣＯ2を改良土に添加すると、改良土粒子内部
まで中性化反応が進む。そのため、無害化処理後の改良
土を目的地盤に埋戻したときに改良土が締固め作業によ
り破砕されても、改良土は内部まで中性化されているの
で、アルカリ性を呈することはない。中性化処理された
改良土は、埋戻し材、盛土材等として再利用するために
必要なハンドリング性およびその強度等の性状は、中性
化処理しない改良土と同等である。さらに、中性化処理
された改良土は従来のような地下水をアルカリ性化する
こともなく、安心して埋戻し材、盛土材等として使用で
きる。The reaction of neutralizing the improved soil proceeds as shown in the following equation (2). Ca (OH) 2 + CO 2 → CaCO 3 + H 2 O (2) When CO 2 is added to the improved soil under pressure, the neutralization reaction proceeds inside the improved soil particles. Therefore, even when the improved soil after the detoxification treatment is backfilled in the target ground, even if the improved soil is crushed by the compacting work, the improved soil is neutralized to the inside and does not exhibit alkalinity. The properties of the improved soil that has undergone the neutralization treatment, such as the handleability and the strength required for reuse as a backfill material, embankment material, etc., are the same as those of the improved soil that has not been neutralized. Furthermore, the neutralized and improved soil can be safely used as a backfill material, embankment material, etc. without alkalizing groundwater as in the conventional case.
【００１１】[0011]
【実施例】本発明の一実施例を図面と共に説明する。図
１には残土に生石灰やセメントを加えて改良した改良土
のストック全体を気密性のカバー１で覆い、このカバー
１内部の空間にＣＯ2を加圧下に導入する無害化処理装
置を示す。該カバー１は気密性のある材料ならいかなる
材料を用いても良い。例えば、プラントでは鋼製容器
が、工事現場では耐圧性かつ機密性の樹脂系シート等が
好適に用いられる。該カバー１には調圧バルブ２を備え
た配管３を介してＣＯ2タンク４が接続している。ま
た、カバー１の適宜の箇所に排気口５を設けているの
で、空気を抜いてＣｏ2を充填し、調圧バルブ２により
カバー１内の加圧状態を調整することができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a detoxification treatment device in which the entire stock of improved soil obtained by adding quick lime or cement to the residual soil is covered with an airtight cover 1 and CO 2 is introduced into the space inside the cover 1 under pressure. The cover 1 may be made of any material as long as it is airtight. For example, a steel container is preferably used in a plant, and a pressure-resistant and airtight resin sheet or the like is preferably used in a construction site. A CO 2 tank 4 is connected to the cover 1 via a pipe 3 equipped with a pressure regulating valve 2. Further, since the exhaust port 5 is provided at an appropriate position of the cover 1, it is possible to evacuate air to fill Co 2 and adjust the pressurization state in the cover 1 by the pressure regulating valve 2.
【００１２】また、図２には複数の加圧槽６を並列状に
配置し、各加圧槽６には図示しない改良土のストックヤ
ードからベルトコンベア等で改良土を導入できるように
して置く。改良土の各加圧槽６内への供給切り替えは各
加圧槽６に接続された流路チェンジャー９で行う。各加
圧槽６内に所定量の改良土が導入されると、ＣＯ2タン
ク４から調圧バルブ２を介してＣＯ2が供給される。例
えば、各加圧槽６内で４気圧、５分間毎処理し、ＣＯ2
を供給する加圧槽６を順次切り替えて行くと、全体とし
て連続的に改良土の無害化処理を行うことができる。無
害化処理した改良土は加圧槽６の下方に配置されている
ベルトコンベア８で搬出する。In FIG. 2, a plurality of pressurizing tanks 6 are arranged in parallel and placed in each pressurizing tank 6 so that the improved soil can be introduced from a stockyard of improved soil (not shown) by a belt conveyor or the like. . The switching of the supply of the improved soil into each pressurizing tank 6 is performed by the flow path changer 9 connected to each pressurizing tank 6. When a predetermined amount of improved soil is introduced into each pressurizing tank 6, CO 2 is supplied from the CO 2 tank 4 via the pressure regulating valve 2. For example, each pressure tank 6 is treated at 4 atmospheric pressure for 5 minutes and CO 2
By sequentially switching the pressure tanks 6 for supplying the soil, the improved soil can be continuously detoxified as a whole. The detoxified improved soil is carried out by a belt conveyor 8 arranged below the pressure tank 6.
【００１３】（実験例）図３に示す３０リットルの容積
を有する三軸圧縮試験機のセル１０内のろ紙１１上に１
０ｋｇの関東ロームにＪＩＳ生石灰を重量比で５％加え
て改良し、１日養生した改良土（試料土１２）を入れ、
加圧ＣＯ2を導入する方法で改良土の中性化処理試験を
行った。その結果を図４と図５に示す。図４は２０℃に
おけるｐＨ≦８．６となる圧力と加圧時間の関係を示
す。ｐＨ≦８．６は、排水としてそのまま放水できる法
定で定める排水基準である。この図４から２気圧以下の
低圧でも約３０分間加圧処理すると改良土の中性化処理
が完了し、高圧にするとより短い時間内で中性化処理が
できることが判明した。(Experimental Example) 1 is placed on the filter paper 11 in the cell 10 of the triaxial compression tester having a volume of 30 liters shown in FIG.
Add 5% by weight of JIS quicklime to a 0 kg Kanto loam to improve it, and put improved soil (sample soil 12) that has been cured for 1 day,
The neutralization test of the improved soil was conducted by the method of introducing pressurized CO 2 . The results are shown in FIGS. 4 and 5. FIG. 4 shows the relationship between the pressure at which pH ≦ 8.6 at 20 ° C. and the pressurization time. pH ≦ 8.6 is a effluent standard defined by law that allows water to be discharged as it is. From FIG. 4, it has been found that the pressure treatment for about 30 minutes completes the neutralization treatment of the improved soil even at a low pressure of 2 atm or less, and the high pressure treatment enables the neutralization treatment within a shorter time.
【００１４】また、図５には２０℃において、０．２気
圧から４気圧の二酸化炭素の加圧下での改良土の時間に
伴うｐＨの低下状況すなわち中性化の進行度合を調べた
結果を示す。また、得られた改良土の強度性状は次の通
りである。養成日数１０日における一軸圧縮強度は、中
性化処理した場合０．７５ｋｇｆ／ｃｍ2で、中性化処
理しない場合０．６５ｋｇｆ／ｃｍ2であった。中性化
処理を行っても改良土の強度が低下するようなことはな
い。本発明はＣＯ2の処分法としても有効であり、改良
土１．５ｔにつき数ｋｇオーダーのＣＯ2が有効利用さ
れる。In addition, FIG. 5 shows the results of examining the state of pH decrease with time of the improved soil under the pressure of carbon dioxide of 0.2 atm to 4 atm at 20 ° C., that is, the degree of progress of neutralization. Show. The strength properties of the obtained improved soil are as follows. Uniaxial compressive strength at training days 10 days, in case 0.75kgf / cm 2 treated neutralized, was when 0.65kgf / cm 2 not treated neutralized. The strength of the improved soil does not decrease even after the neutralization treatment. The present invention is also effective as a CO 2 disposal method, and several kg of CO 2 is effectively used for 1.5 t of improved soil.
【００１５】[0015]
【発明の効果】本発明によれば、各種土を生石灰、セメ
ント等により改良した改良土をＣＯ2で中性化処理する
ことにより、法定で定める排水基準を容易に達成する無
害化改良土が得られる。そのため改良土を安心して利用
することができ、利用分野が広がることから、残土等の
有効利用の促進が図れる。また、掘削により掘り出され
た残土改良土および地盤改良土についても中性化処理に
より無害化改良土とすることで再利用ないし土としての
扱いを図ることができる。さらに、本発明はＣＯ2の有
効利用法の一つにもなる。EFFECTS OF THE INVENTION According to the present invention, a detoxified improved soil that easily achieves the drainage standard stipulated by law is obtained by neutralizing the improved soil obtained by improving various soils with quick lime, cement, etc. with CO 2. can get. Therefore, the improved soil can be used without anxiety, and the fields of application are expanded, so that the effective use of the remaining soil can be promoted. In addition, the residual soil-improved soil and ground-improved soil excavated by excavation can be reused or treated as soil by detoxifying and improving soil by neutralizing. Furthermore, the present invention is one of the effective uses of CO 2 .
【図１】 本発明の一実施例の改良土の無害化処理装置
の概念図である。FIG. 1 is a conceptual diagram of an improved soil detoxification processing apparatus according to an embodiment of the present invention.
【図２】 本発明の一実施例の改良土の無害化処理装置
の概念図である。FIG. 2 is a conceptual diagram of an improved soil detoxification processing apparatus according to an embodiment of the present invention.
【図３】 本発明の改良土の無害化処理装置の実験装置
の概念図である。FIG. 3 is a conceptual diagram of an experimental apparatus of the improved soil detoxification processing apparatus of the present invention.
【図４】 図３の装置で行った改良土の中性化処理実験
の結果を示すデータである。FIG. 4 is data showing the results of the neutralization treatment experiment of the improved soil performed by the apparatus of FIG.
【図５】 図３の装置で行った改良土の中性化処理実験
の結果を示すデータである。FIG. 5 is data showing the results of the neutralization treatment experiment of the improved soil performed by the apparatus of FIG.
１…カバー、２…調圧バルブ、３…配管、４…ＣＯ2タ
ンク、５…排気口、６…加圧槽、８…ベルトコンベア、
９…流路チェンジャー、 １０…セル、１１…ろ紙、１
２…試料土1 ... Cover, 2 ... Pressure regulating valve, 3 ... Piping, 4 ... CO 2 tank, 5 ... Exhaust port, 6 ... Pressurizing tank, 8 ... Belt conveyor,
9 ... Channel changer, 10 ... Cell, 11 ... Filter paper, 1
2 ... Sample soil
Claims (4)
はセメント系材料を混合して得られた改良土を二酸化炭
素で加圧処理することを特徴とする改良土の無害化処理
方法。1. A method for detoxifying improved soil, which comprises subjecting the improved soil obtained by mixing soil with quick lime, cement, lime-based material or cement-based material to pressure treatment with carbon dioxide.
良土または地盤改良土であることを特徴とする請求項１
記載の改良土の無害化処理方法。2. The improved soil is a residual soil improved soil or ground improved soil excavated by excavation.
Method for detoxifying improved soil described.
はセメント系材料を混合して得られた改良土を二酸化炭
素で加圧処理して製造される無害化改良土。3. A detoxified improved soil produced by pressure-treating improved soil obtained by mixing soil with quick lime, cement, lime-based material or cement-based material, with carbon dioxide.
は地盤改良土を二酸化炭素で加圧処理して製造される無
害化改良土。4. Detoxified improved soil produced by pressurizing residual soil-improved soil or ground-improved soil excavated by excavation with carbon dioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6068779A JP3030798B2 (en) | 1994-04-06 | 1994-04-06 | Detoxification method of improved soil and detoxified improved soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6068779A JP3030798B2 (en) | 1994-04-06 | 1994-04-06 | Detoxification method of improved soil and detoxified improved soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07278541A true JPH07278541A (en) | 1995-10-24 |
| JP3030798B2 JP3030798B2 (en) | 2000-04-10 |
Family
ID=13383569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6068779A Expired - Fee Related JP3030798B2 (en) | 1994-04-06 | 1994-04-06 | Detoxification method of improved soil and detoxified improved soil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3030798B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5997629A (en) * | 1995-10-06 | 1999-12-07 | Imperial College Of Science, Technology And Medicine | Hazardous waste treatment |
| DE10131869B4 (en) * | 2001-06-25 | 2008-10-30 | Ernst Josef Kronenberger | Process for neutralizing calcium hydroxide Ca (OH) 2 in lime-improved soils to prevent the pozzolanic reaction |
| JP2014012930A (en) * | 2012-07-03 | 2014-01-23 | Nippon Steel & Sumitomo Metal | Estimation method of modified soil strength and manufacturing method of modified soil using the same |
| NO20160273A1 (en) * | 2015-02-16 | 2016-08-17 | Jle As | Method for stabilizing grounds |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3385797B2 (en) * | 1995-06-12 | 2003-03-10 | 松下電器産業株式会社 | Washing machine |
-
1994
- 1994-04-06 JP JP6068779A patent/JP3030798B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5997629A (en) * | 1995-10-06 | 1999-12-07 | Imperial College Of Science, Technology And Medicine | Hazardous waste treatment |
| DE10131869B4 (en) * | 2001-06-25 | 2008-10-30 | Ernst Josef Kronenberger | Process for neutralizing calcium hydroxide Ca (OH) 2 in lime-improved soils to prevent the pozzolanic reaction |
| JP2014012930A (en) * | 2012-07-03 | 2014-01-23 | Nippon Steel & Sumitomo Metal | Estimation method of modified soil strength and manufacturing method of modified soil using the same |
| NO20160273A1 (en) * | 2015-02-16 | 2016-08-17 | Jle As | Method for stabilizing grounds |
| NO339059B1 (en) * | 2015-02-16 | 2016-11-07 | Jle As | Method for stabilizing grounds |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3030798B2 (en) | 2000-04-10 |
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