JPH11244807A - Impervious layer - Google Patents
Impervious layerInfo
- Publication number
- JPH11244807A JPH11244807A JP10053490A JP5349098A JPH11244807A JP H11244807 A JPH11244807 A JP H11244807A JP 10053490 A JP10053490 A JP 10053490A JP 5349098 A JP5349098 A JP 5349098A JP H11244807 A JPH11244807 A JP H11244807A
- Authority
- JP
- Japan
- Prior art keywords
- montmorillonite
- soil
- water
- composition
- ions
- 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- Withdrawn
Links
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、廃棄物処分場等に
おける漏水の漏洩を防止する遮水層に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impermeable layer for preventing water leakage at a waste disposal site or the like.
【０００２】[0002]
【従来の技術】地面の凹部等に廃棄物を投棄する形式の
廃棄物処分場においては、廃棄物から滲出する汚染され
た水が地層に漏洩することを防止するため、その底面
に、水の漏洩を防ぐ構造を設けることが行われている。
この構造としては、地面凹部の底面上に設けられた、粘
土を含む組成物からなる厚さ５０ｃｍ程度の遮水層と、
その上にさらに設けられた１層以上のゴム、高密度ポリ
エチレン等からなる遮水シートを含む構造が通常採用さ
れる。この構造により、汚染された水の漏洩は通常遮水
シートにより防止され、万一遮水シートに損傷が発生し
た場合でも、汚染された水の地層への漏洩が遮水層によ
って防がれる。2. Description of the Related Art In a waste disposal site in which waste is dumped into a concave portion of the ground or the like, contaminated water leaching from the waste is prevented from leaking into the stratum. It has been practiced to provide a structure to prevent leakage.
As this structure, a water-impervious layer having a thickness of about 50 cm made of a composition containing clay,
A structure including a water-impervious sheet made of one or more layers of rubber, high-density polyethylene or the like further provided thereon is usually employed. With this structure, the leakage of the contaminated water is usually prevented by the impermeable sheet, and even if the impermeable sheet should be damaged, the impermeable layer prevents the contaminated water from leaking into the stratum.
【０００３】前記遮水層を構成する組成物としては、現
地発生土に、Ｎａ−モンモリロナイト、Ｃａ−モンモリ
ロナイト等のモンモリロナイトを配合したものが用いら
れている。膨潤性の高いＮａ−モンモリロナイト、Ｃａ
−モンモリロナイト等のモンモリロナイトを含むことに
より、組成物は膨潤した状態を保ち、それにより高い遮
水能を示す。[0003] As the composition constituting the water barrier layer, a mixture of montmorillonite such as Na-montmorillonite, Ca-montmorillonite, and the like in a locally generated soil is used. Highly swellable Na-montmorillonite, Ca
-By including montmorillonite, such as montmorillonite, the composition remains swollen, thereby exhibiting high water barrier properties.
【０００４】しかしながら、遮水シートの損傷部から漏
洩する汚染された水は、１５０００ｐｐｍ程度のＣｌ-
を含むもの等の高い塩分濃度を有する水であることが多
く、Ｎａ−モンモリロナイト及びＣａ−モンモリロナイ
トは、このような高い塩分濃度を有する水と接触すると
膨潤性が低下し、その結果遮水能が低下するという問題
点がある。However, contaminated water leaking from the damaged portion of the water shield sheets, about 15000 ppm Cl -
Is often water having a high salt concentration, such as those containing Na-montmorillonite and Ca-montmorillonite, when contacted with water having such a high salt concentration, the swelling property is reduced, and as a result, the water blocking ability is reduced. There is a problem that it decreases.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、高い
塩分濃度を有する水と接触しても遮水能が低下しない遮
水層を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a water-blocking layer which does not decrease its water-blocking ability even when it comes into contact with water having a high salt concentration.
【０００６】[0006]
【課題を解決するための手段】本発明によれば、交換性
陽イオン全量中のイオン濃度として２０％以上の割合で
Ｍｇ2+イオンを含むモンモリロナイト、及び土を含む組
成物からなることを特徴とする遮水層が提供される。According to the present invention, there is provided a composition comprising montmorillonite containing Mg 2+ ions at an ion concentration of 20% or more based on the total amount of exchangeable cations, and a composition containing soil. Is provided.
【０００７】[0007]
【発明の実施の形態】本発明の遮水層は、特定のモンモ
リロナイト及び土を含む組成物からなる。BEST MODE FOR CARRYING OUT THE INVENTION The impermeable layer of the present invention comprises a composition containing specific montmorillonite and soil.
【０００８】前記特定のモンモリロナイトは、その中に
含まれる交換性陽イオン全量中イオン濃度として２０％
以上の割合でＭｇ2+イオンを含むモンモリロナイトであ
る。ここで、イオン濃度とは、モンモリロナイトが有す
る全ての交換性陽イオンの当量の合計に対するＭｇ2+の
当量である。このようなモンモリロナイトを含む組成物
は、Ｍｇ2+イオンのイオン濃度が低くＮａ+、Ｃａ2+等
のイオン濃度が高いモンモリロナイトと比べて、膨潤度
は低いものの遮水層用の組成物としては十分な膨潤性を
有しており、且つ高い塩分濃度を有する水と接触しても
遮水性が低下しない。The specific montmorillonite has an ion concentration of 20% in the total amount of exchangeable cations contained therein.
It is a montmorillonite containing Mg 2+ ions in the above ratio. Here, the ion concentration is the equivalent of Mg 2+ to the total equivalent of all exchangeable cations of montmorillonite. Such a composition containing montmorillonite has a low ion concentration of Mg 2+ ions and a low swelling degree as compared with montmorillonite having a high ion concentration of Na + , Ca 2+, etc. Even if it has sufficient swelling property and contacts with water having a high salt concentration, the water barrier property does not decrease.
【０００９】前記特定のモンモリロナイトは、通常採取
されるＮａ−モンモリロナイトやＣａ−モンモリロナイ
トに、水酸化マグネシウム、塩化マグネシウム、炭酸マ
グネシウム、高炉スラグ等マグネシウムイオンを有する
化合物と混合することによって得ることができる。The specific montmorillonite can be obtained by mixing usually collected Na-montmorillonite or Ca-montmorillonite with a compound having magnesium ions such as magnesium hydroxide, magnesium chloride, magnesium carbonate and blast furnace slag.
【００１０】前記土とは、モンモリロナイト以外の土で
あれば特に限定されず、現地発生土等の土を使用するこ
とができる。[0010] The soil is not particularly limited as long as it is soil other than montmorillonite, and soil such as locally generated soil can be used.
【００１１】前記組成物中の前記特定のモンモリロナイ
ト及び前記土の含有割合は、乾燥重量比で３：９７〜２
０：８０であることが好ましい。The content ratio of the specific montmorillonite and the soil in the composition is from 3:97 to 2 by dry weight ratio.
0:80 is preferable.
【００１２】前記組成物は、必要に応じてさらに他の成
分を含んでもよい。前記他の成分としては、高炉セメン
ト、フライアッシュセメント等の各種のセメントや、Ｍ
ｇ2+イオンを多く含み、モンモリロナイトにＭｇ2+イオ
ンを与えることができる高炉スラグ等を好ましく挙げる
ことができる。前記組成物中の前記セメント又は高炉ス
ラグの割合は、組成物調製の際の配合割合として、前記
土１００重量部に対して１〜１０重量部であることが好
ましい。[0012] The composition may further contain other components as necessary. As the other components, various cements such as blast furnace cement and fly ash cement;
Preferable examples include blast furnace slag which contains a large amount of g 2+ ions and can give Mg 2+ ions to montmorillonite. The ratio of the cement or the blast furnace slag in the composition is preferably 1 to 10 parts by weight based on 100 parts by weight of the soil as a mixing ratio at the time of preparing the composition.
【００１３】具体的には例えば、乾燥重量比で３：９７
〜２０：８０の前記特定のモンモリロナイト及び土と、
必要に応じて加える高炉スラグ等のセメント等の成分と
を、混練する。このとき土の保有する水で不足するとき
は、これらの乾燥重量の合計１００重量部に対して３〜
５０重量部となるよう水を添加しながら練り混ぜること
により、前記組成物を得ることができる。Specifically, for example, a dry weight ratio of 3:97
-20: 80 of said particular montmorillonite and soil;
A component such as cement, such as blast furnace slag, to be added as needed is kneaded. At this time, if the water held by the soil is insufficient, 3 to 100 parts by weight of these dry weights in total are used.
The composition can be obtained by kneading while adding water so as to be 50 parts by weight.
【００１４】また、前記特定のモンモリロナイトを用い
ず、Ｎａモンモリロナイト、Ｃａモンモリロナイト等の
前記特定のモンモリロナイト以外のモンモリロナイトを
用い、これと、土、及び水酸化マグネシウム、塩化マグ
ネシウム、炭酸マグネシウム、高炉スラグ等マグネシウ
ムイオンを有する化合物とを混合することによっても、
練り混ぜの過程においてモンモリロナイト中の交換性陽
イオンが置換され、前記組成物を得ることができる。こ
の場合、乾燥重量比で３：９７〜２０：８０のモンモリ
ロナイト及び土と、必要に応じて加える高炉スラグ等の
セメント等の成分とに、さらにマグネシウムイオンを有
する化合物を添加し、さらにこれらの乾燥重量の合計１
００重量部に対して３〜５０重量部の水を添加しながら
練り混ぜることにより、交換性陽イオンが十分に置換さ
れ、前記組成物を得ることができる。この際のマグネシ
ウムイオンを有する化合物の添加割合は、モンモリロナ
イトの乾燥重量１００重量部に対してＭｇ2+イオンとし
て２０〜２００重量部とすることによって交換性陽イオ
ンが十分に置換される。Further, instead of using the specific montmorillonite, a montmorillonite other than the specific montmorillonite such as Na montmorillonite and Ca montmorillonite is used. By mixing with a compound having an ion,
In the kneading process, the exchangeable cations in the montmorillonite are replaced, and the composition can be obtained. In this case, a compound having a magnesium ion is further added to montmorillonite and soil in a dry weight ratio of 3:97 to 20:80 and components such as cement such as blast furnace slag to be added as required, and further drying these compounds. Total weight 1
By kneading while adding 3 to 50 parts by weight of water with respect to 00 parts by weight, the exchangeable cation is sufficiently substituted, and the composition can be obtained. At this time, exchangeable cations are sufficiently substituted by adding 20 to 200 parts by weight of Mg 2+ ions with respect to 100 parts by weight of dry weight of montmorillonite.
【００１５】前記組成物は、廃棄物処分場の底面等の水
の漏洩を防止すべき部分に、５０ｃｍ以上の厚さで敷設
することにより、本発明の遮水層とすることができる。
前記敷設の方法は、限定しないが、２０ｃｍ程度厚さに
巻き出し、ローラー等で転圧することを繰り返して行う
ことによる方法が好ましい。The above-described composition can be used as a water-blocking layer of the present invention by laying it at a thickness of 50 cm or more on a portion where leakage of water is to be prevented, such as a bottom surface of a waste disposal site.
Although the method of the laying is not limited, a method of repeatedly performing unwinding to a thickness of about 20 cm and rolling with a roller is preferable.
【００１６】[0016]
【発明の効果】本発明の遮水層は、特定のモンモリロナ
イトを含むため、高い塩分濃度を有する水と接触しても
遮水能が低下せず、一方廃棄物処分場の遮水層として十
分な遮水能を与える膨潤性を有している。従って、廃棄
物処分場等の汚染された水の漏洩を防ぐための遮水層と
して有用である。The water-impervious layer of the present invention contains a specific montmorillonite, so that the water-impervious ability does not decrease even when it comes into contact with water having a high salt concentration, while it is sufficient as a water-impervious layer for waste disposal sites. It has a swelling property that gives a good water blocking ability. Therefore, it is useful as a water barrier for preventing leakage of contaminated water from a waste disposal site or the like.
【００１７】[0017]
【実施例】以下実施例によりさらに詳細に説明するが、
本発明はこれらに限定されるものではない。The present invention will be described in more detail with reference to the following examples.
The present invention is not limited to these.
【００１８】[0018]
【実施例１】土（関東ローム層）８０重量部、モンモリ
ロナイト（ワイオミング産、Ｎａ−モンモリロナイト）
８重量部、炭酸マグシウム４重量部及び水８重量部を配
合し練り混ぜた混合物を圧密化して、遮水層とした。Example 1 80 parts by weight of soil (Kanto loam layer), montmorillonite (from Wyoming, Na-montmorillonite)
A mixture obtained by mixing 8 parts by weight, 4 parts by weight of magnesium carbonate and 8 parts by weight of water and kneading them was consolidated to form a water-blocking layer.
【００１９】この遮水層に、１０重量％食塩水を１０ｇ
／ｃｍ2の圧力で適用するアウトプット法により透水係
数を測定したところ、１．８×１０-8ｃｍ／秒であっ
た。この値は、１か月間測定を続けても一定の値を保っ
た。10 g of a 10% by weight saline solution was added to the impermeable layer.
The water permeability measured by an output method applied at a pressure of / cm 2 was 1.8 × 10 −8 cm / sec. This value remained constant even if the measurement was continued for one month.
【００２０】[0020]
【実施例２】土（関東ローム層）８０重量部、モンモリ
ロナイト（宮城県蔵王産）８重量部、高炉スラグ（商品
名「エスメント」、新日鐵化学株式会社製）４重量部及
び水８重量部を配合し練り混ぜた混合物を圧密化して、
遮水層とした。Example 2 80 parts by weight of soil (Kanto loam layer), 8 parts by weight of montmorillonite (from Zao, Miyagi Prefecture), 4 parts by weight of blast furnace slag (trade name "Esment", manufactured by Nippon Steel Chemical Co., Ltd.) and 8 parts by weight of water Parts and knead the mixture to consolidate,
A water-impervious layer was used.
【００２１】この遮水層に、１０重量％食塩水を１０ｇ
／ｃｍ2の圧力で適用するアウトプット法により透水係
数を測定したところ、３．１×１０-8ｃｍ／秒であっ
た。この値は、１か月間測定を続けても一定の値を保っ
た。10 g of a 10% by weight saline solution was added to the impermeable layer.
The water permeability measured by an output method applied at a pressure of / cm 2 was 3.1 × 10 −8 cm / sec. This value remained constant even if the measurement was continued for one month.
【００２２】[0022]
【比較例１】炭酸マグネシウムを加えなかった他は、実
施例１と同様に操作し、遮水層を作成し、透水係数を測
定したところ、３日後にその値が急速に低下し、１．７
×１０-6ｃｍ／秒となった。[Comparative Example 1] The same operation as in Example 1 was carried out except that magnesium carbonate was not added, and a water-impervious layer was formed. The water permeability was measured. 7
× 10 −6 cm / sec.
【００２３】[0023]
【比較例２】高炉スラグを加えなかった他は、実施例２
と同様に操作し、遮水層を作成し、透水係数を測定した
ところ、２日後にその値が急速に低下し、２．５×１０
-6ｃｍ／秒となった。Comparative Example 2 Example 2 was repeated except that blast furnace slag was not added.
The same operation as described above was carried out to form a water-impervious layer, and the permeability was measured.
-6 cm / sec.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 前田 照信 東京都港区北青山二丁目５番８号 株式会 社間組内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Terunobu Maeda 2-5-8 Kitaaoyama, Minato-ku, Tokyo
Claims (2)
て２０％以上の割合でＭｇ2+イオンを含むモンモリロナ
イト、及び土を含む組成物からなることを特徴とする遮
水層。1. A water-blocking layer comprising a composition containing montmorillonite containing Mg 2+ ions in an amount of 20% or more as an ion concentration in the total amount of exchangeable cations and a composition containing soil.
とを特徴とする請求項１記載の遮水層。2. The impermeable layer according to claim 1, wherein the composition further comprises blast furnace slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10053490A JPH11244807A (en) | 1998-03-05 | 1998-03-05 | Impervious layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10053490A JPH11244807A (en) | 1998-03-05 | 1998-03-05 | Impervious layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11244807A true JPH11244807A (en) | 1999-09-14 |
Family
ID=12944294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10053490A Withdrawn JPH11244807A (en) | 1998-03-05 | 1998-03-05 | Impervious layer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11244807A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006083354A (en) * | 2004-09-17 | 2006-03-30 | Kajima Corp | Water-proofing sealant for seam and water-blocking layer-forming material, consisting of bentonite slurry |
| CN116590025A (en) * | 2023-07-18 | 2023-08-15 | 北京助天科技集团有限公司 | Soil anti-seepage agent, application thereof and self-adaptive anti-seepage structure |
-
1998
- 1998-03-05 JP JP10053490A patent/JPH11244807A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006083354A (en) * | 2004-09-17 | 2006-03-30 | Kajima Corp | Water-proofing sealant for seam and water-blocking layer-forming material, consisting of bentonite slurry |
| JP4632730B2 (en) * | 2004-09-17 | 2011-02-16 | 鹿島建設株式会社 | Seam-proofing material made of bentonite slurry and water-shielding layer forming material |
| CN116590025A (en) * | 2023-07-18 | 2023-08-15 | 北京助天科技集团有限公司 | Soil anti-seepage agent, application thereof and self-adaptive anti-seepage structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20050510 |