JPH09211189A - Anti-sulfate shield material - Google Patents
Anti-sulfate shield materialInfo
- Publication number
- JPH09211189A JPH09211189A JP1323696A JP1323696A JPH09211189A JP H09211189 A JPH09211189 A JP H09211189A JP 1323696 A JP1323696 A JP 1323696A JP 1323696 A JP1323696 A JP 1323696A JP H09211189 A JPH09211189 A JP H09211189A
- Authority
- JP
- Japan
- Prior art keywords
- ion
- barium
- bentonite
- sulfate
- shielding material
- 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
Landscapes
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、耐硫酸塩抵抗性が
要求されるベントナイトを含む遮蔽材に関し、更に詳細
には、放射性廃棄物処分施設等の外周充填材に利用して
人工バリアを形成させることが可能な耐硫酸塩用遮蔽材
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielding material containing bentonite which is required to have resistance to sulfate, and more specifically, it is used as an outer peripheral filling material for radioactive waste disposal facilities to form an artificial barrier. The present invention relates to a sulfate resistant shielding material that can be used.
【０００２】[0002]
【従来の技術】従来、放射性廃棄物処分として、浅地層
処分、深地層処分、地中圧入、海洋低下処分等が知られ
ている。例えば浅地層処分や深地層処分においては、放
射線廃棄物を、セメント固化等安定化処理、ガラス固化
安定化処理等されるかまたは容器に封入し、該放射性固
体廃棄物を、地層に設置したピット等の外周仕切設備
（人工バリア）と周辺土壌等（天然バリア）とを組合わ
せた施設内で隔離管理する方法が実施されている。この
ような施設における外周仕切設備の材料としては、ベン
トナイトを含む遮蔽材（バリア）や更にセメント材料を
配合してモルタルやコンクリートとした遮蔽材が使用さ
れている。また、不透水粘土層やトレンチ内の隙間等に
もベントナイトを含む遮蔽材が使用されている。このよ
うな遮蔽材に含有されるベントナイトは、モンモリロナ
イト等のスメクタイト族鉱物が主成分であることが知ら
れている。2. Description of the Related Art Conventionally, as radioactive waste disposal, shallow geological disposal, deep geological disposal, underground injection, ocean depletion disposal, etc. are known. For example, in shallow geological disposal or deep geological disposal, radioactive waste is subjected to stabilization treatment such as cement hardening, vitrification stabilization treatment, etc. or enclosed in a container, and the radioactive solid waste is placed in a pit A method of separating and managing the facilities in a facility that combines peripheral partitioning equipment (artificial barrier) and surrounding soil (natural barrier). As a material for the outer peripheral partitioning facility in such a facility, a shielding material (barrier) containing bentonite and a shielding material made into mortar or concrete by further mixing a cement material are used. Further, a shielding material containing bentonite is also used for the impermeable clay layer, the gap in the trench, and the like. It is known that the bentonite contained in such a shielding material is mainly composed of a smectite group mineral such as montmorillonite.
【０００３】これらの遮蔽材を地層や地下水面下等に建
設した施設に使用する場合には、地下水の影響を考慮す
る必要があり、特に地下水に硫酸塩が含有されている場
合には、該遮蔽材を含め施設のコンクリート材料等に硫
酸塩が浸透し、エトリンガイトを生成し、遮蔽材やコン
クリート材料に悪影響を与える恐れがある。When these shielding materials are used in a facility constructed in a stratum or below the water table, it is necessary to consider the influence of the ground water, especially when the ground water contains sulfate. Sulfate may penetrate into the concrete material of the facility including the shielding material and form ettringite, which may adversely affect the shielding material and the concrete material.
【０００４】[0004]
【発明が解決しようとする課題】従って、本発明の目的
は、耐硫酸塩抵抗性を有し、放射性廃棄物処理施設等の
人工バリア材としても使用可能な耐硫酸塩用遮蔽材を提
供することにある。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sulfate resistant shielding material which has sulfate resistance and can be used as an artificial barrier material for radioactive waste treatment facilities and the like. Especially.
【０００５】[0005]
【課題を解決するための手段】本発明によれば、ベント
ナイトを含む耐硫酸塩抵抗性が付与された遮蔽材であっ
て、前記ベントナイトが、バリウムイオンとイオン交換
処理したベントナイトを含有することを特徴とする耐硫
酸塩用遮蔽材が提供される。According to the present invention, there is provided a shielding material having bentonite-containing sulfate resistance, wherein the bentonite contains bentonite ion-exchanged with barium ions. A featured sulfate resistant shield is provided.
【０００６】[0006]
【発明の形態】本発明の遮蔽材は、有効成分として、バ
リウムイオンとイオン交換処理したベントナイトを含有
する。バリウムイオンとイオン交換処理するとは、ベン
トナイトの主成分であるモンモリロナイト等のスメクタ
イト族鉱物の層間イオンをバリウムイオン（Ｂａ2+）で
置換することを言う。この際イオン交換率は特に限定さ
れず、重要となるのは目的とする遮蔽材中に含有される
バリウムイオン濃度によって決定される。従って、遮蔽
材中の前記イオン交換処理されたベントナイトの含有割
合は、遮蔽材中のバリウムイオン濃度が０．１〜１５
％、特に１〜１０％の範囲となるようにするのが好まし
い。１５％を超える場合には遊離バリウムの溶出の恐れ
があるので好ましくない。この有効成分は、モルタルや
コンクリートが硫酸塩環境下に暴露された場合に、浸透
してくる硫酸塩とバリウムイオンとが反応し、難溶性の
硫酸バリウム塩を生成し、硫酸塩によるモルタルやコン
クリートの化学的腐食を低減させるよう作用する。BEST MODE FOR CARRYING OUT THE INVENTION The shielding material of the present invention contains, as an active ingredient, bentonite ion-exchanged with barium ions. The ion exchange treatment with barium ions means replacing interlayer ions of smectite group minerals such as montmorillonite, which is the main component of bentonite, with barium ions (Ba 2+ ). At this time, the ion exchange rate is not particularly limited, and what is important is determined by the barium ion concentration contained in the intended shielding material. Therefore, the content of the ion-exchanged bentonite in the shielding material is such that the barium ion concentration in the shielding material is 0.1 to 15
%, Particularly preferably 1 to 10%. If it exceeds 15%, free barium may be eluted, which is not preferable. When the mortar or concrete is exposed to a sulfate environment, this active ingredient reacts with the permeating sulfate and barium ion to form a sparingly soluble barium sulfate salt, and the mortar or concrete with the sulfate salt. Acts to reduce the chemical corrosion of.
【０００７】前記イオン交換処理されたベントナイトを
調製するには、例えば水酸化バリウム溶液、塩化バリウ
ム溶液、炭酸バリウム溶液等のバリウムイオンを含む溶
液中に、処理すべきベントナイトを浸漬・撹拌し、密封
状態において真空脱泡処理等を行うことによって得るこ
とができる。前記バリウムイオンを含む溶液中のバリウ
ムイオン濃度は、０．５規定（Ｎ）以上、特に０．５〜
２Ｎの範囲が好ましい。また、真空脱泡は、真空ポンプ
やロータリーポンプ等を使用して、例えば７００ｍＨｇ
程度において６時間以上、好ましくは２４時間以上行う
ことによって所望のイオン交換処理を行うことができ
る。To prepare the above-mentioned ion-exchange treated bentonite, the bentonite to be treated is immersed and stirred in a solution containing barium ions such as barium hydroxide solution, barium chloride solution and barium carbonate solution, and sealed. It can be obtained by performing vacuum defoaming treatment or the like in the state. The barium ion concentration in the solution containing barium ions is 0.5 N (N) or more, particularly 0.5 to
A range of 2N is preferred. In addition, vacuum degassing is performed by using a vacuum pump, a rotary pump, or the like, for example, 700 mHg
The desired ion exchange treatment can be performed by performing the treatment for 6 hours or longer, preferably for 24 hours or longer.
【０００８】本発明の遮蔽材には、前記ベントナイト、
イオン交換処理されたベントナイトの他に、セメント材
料、水、骨材等を適宜含有させることができる。セメン
ト材料を用いる場合の水セメント比は、特に限定される
ものではないが、重量比で１：１．２５〜０．６７が好
ましい。即ち水（Ｗ）／セメント（Ｃ）＝８０〜１５０
の範囲が好ましい。The shielding material of the present invention includes the bentonite,
In addition to the ion-exchanged bentonite, a cement material, water, aggregate, etc. can be appropriately contained. The water-cement ratio when a cement material is used is not particularly limited, but a weight ratio of 1: 1.25 to 0.67 is preferable. That is, water (W) / cement (C) = 80 to 150
Is preferred.
【０００９】前記セメント材料としては、普通ポルトラ
ンドセメント、早強ポルトランドセメント、フライアッ
シュセメント、高炉セメント等を用いることができ、骨
材としは、公知の天然骨材、合成骨材、副産骨材又はこ
れらの混合物のいずれも使用することができる。骨材の
配合割合は、セメント材料１００重量部に対して３００
〜５００重量部の範囲で配合させることができる。ま
た、公知の天然細骨材、合成細骨材、副産細骨材又はこ
れらの混合物、高性能減水剤、ＡＥ剤等の各種混和剤や
混和材料を、適宜含有させることができる。As the cement material, ordinary Portland cement, early-strength Portland cement, fly ash cement, blast furnace cement, etc. can be used. As the aggregate, known natural aggregate, synthetic aggregate, by-product aggregate Alternatively, any of these mixtures can be used. The mixing ratio of aggregate is 300 with respect to 100 parts by weight of cement material.
It can be compounded in the range of 500 parts by weight. Further, various known admixtures and admixtures such as known natural fine aggregates, synthetic fine aggregates, by-product fine aggregates or mixtures thereof, high-performance water reducing agents, and AE agents can be appropriately contained.
【００１０】前記セメント材料等を含有させる場合の遮
蔽材中のイオン交換処理されたベントナイトの配合量
は、基本的には前述のとおり遮蔽材中にバリウムイオン
が０．１％以上、好ましくは１．０〜１０％含有される
ように配合するのが好ましい。具体的には、セメント材
料１００重量部に対して、３０〜８０重量部、特に４０
〜５０重量部含有させるのが好ましい。The amount of bentonite ion-exchanged in the shielding material when the cement material or the like is contained is basically 0.1% or more of barium ions in the shielding material, preferably 1 as described above. It is preferable to mix such that the content is from 0 to 10%. Specifically, with respect to 100 parts by weight of the cement material, 30 to 80 parts by weight, particularly 40
It is preferable to contain ˜50 parts by weight.
【００１１】本発明の遮蔽材は、例えば人工バリアとし
て構築するには、所望するイオン交換処理されたベント
ナイト及びセメント材料等を含む遮蔽材組成物を、通常
のコンクリートやモルタルを施工する際と同様な方法で
硬化、養生させることにより得ることができる。また、
不透水性層である他の遮蔽材料の隙間等を埋める充填材
料として用いる場合にも同様に所望するイオン交換処理
されたベントナイト及びセメント材料等を含む遮蔽材料
組成物を通常のコンクリートやモルタルを施工する際と
同様な方法で硬化・養生させることによって得ることが
できる。To construct the shielding material of the present invention as, for example, an artificial barrier, the shielding material composition containing the desired ion-exchanged bentonite and cement material is used in the same manner as in the case of applying ordinary concrete or mortar. It can be obtained by curing and curing by various methods. Also,
Similarly, when used as a filling material for filling gaps or the like of another shielding material which is an impermeable layer, a concrete or mortar is applied to the shielding material composition containing the desired ion-exchanged bentonite and cement material. It can be obtained by curing and curing in the same manner as in the case of
【００１２】[0012]
【発明の効果】本発明の遮蔽材は、有効成分としてバリ
ウムイオンでイオン交換処理されたベントナイトを含有
するので、遮蔽材に硫酸塩が浸入すると、難溶性の硫酸
バリウムを形成し、遮蔽材自体や遮蔽材により遮蔽され
たコンクリートやモルタルへの硫酸塩の浸入を有効に遮
蔽することができる。従って、硫酸塩芯乳によるコンク
リートやモルタルの化学的腐食等を防止することがで
き、例えば放射線廃棄物処分施設における人工バリア材
等として極めて有用である。Since the shielding material of the present invention contains bentonite ion-exchanged with barium ions as an active ingredient, when sulfate penetrates into the shielding material, it forms barium sulfate which is hardly soluble, and the shielding material itself. It is possible to effectively block the infiltration of sulfate into concrete or mortar that has been shielded by or a shielding material. Therefore, chemical corrosion of concrete or mortar due to sulfate core milk can be prevented, and it is extremely useful as, for example, an artificial barrier material in a radioactive waste disposal facility.
【００１３】[0013]
【実施例】以下、実施例及び比較例により更に詳細に説
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 below in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.
【００１４】[0014]
【実施例１】水酸化バリウム飽和溶液中に、ベントナイ
ト４００重量部を浸漬し、撹拌した後、密閉し、ロータ
リーポンプ（佐藤真空機械工業（株）製）により、７０
０ｍＨｇで２４時間真空脱泡処理を行って、バリウムイ
オンでイオン交換処理したベントナイトを得た。次い
で、得られたイオン交換処理されたベントナイト４００
重量部、セメント１０００重量部、水１３００重量部、
砂３６００重量部を（バリウムイオン濃度は１０％）、
モルタルミキサーにて混練した。得られた混練物を４ｃ
ｍ×４ｃｍ×１６ｃｍの型枠に注入し、２０℃、一定に
保持して硬化させた。２４時間後脱型して供試体を得た
後、該供試体を密閉容器中の水に浸漬し、２０℃に保持
して２８日間養生した。[Example 1] 400 parts by weight of bentonite was immersed in a saturated solution of barium hydroxide, stirred, then sealed, and a rotary pump (manufactured by Sato Vacuum Machinery Co., Ltd.)
Vacuum defoaming treatment was performed at 0 mHg for 24 hours to obtain bentonite ion-exchanged with barium ions. Then, the obtained ion-exchange treated bentonite 400
Parts by weight, 1000 parts by weight of cement, 1300 parts by weight of water,
3600 parts by weight of sand (barium ion concentration is 10%),
It was kneaded with a mortar mixer. 4c of the obtained kneaded product
It was poured into a mold of m × 4 cm × 16 cm, and kept at 20 ° C. and cured. After 24 hours, it was demolded to obtain a specimen, which was then immersed in water in a closed container and kept at 20 ° C. for 28 days for curing.
【００１５】次いで、養生後の供試体の外面に、１面だ
け残してエポキシ樹脂をコーティングした後、１０％の
硫酸ナトリウム溶液中に３月間浸漬した。浸漬後の供試
体のエポキシ樹脂をコーティングしていない面を電子顕
微鏡元素分析装置（ＥＰＭＡ）（日本電子（株）製）に
よりイオウの浸透深さを測定した。浸透深さは、初期材
令のイオウ濃度（０．５％）より濃度が増加した深さを
測定した。その結果、浸透深さは約６ｍｍであり、また
イオウ浸透量をＥＰＭＡ写真の面積から計算したところ
６％以下で、表面におけるイオウ濃度は４％であった。Next, the outer surface of the cured specimen was coated with an epoxy resin leaving only one surface and then immersed in a 10% sodium sulfate solution for 3 months. The penetration depth of sulfur was measured by an electron microscope elemental analyzer (EPMA) (manufactured by JEOL Ltd.) on the surface of the test piece after immersion that was not coated with the epoxy resin. As the penetration depth, the depth at which the concentration increased from the sulfur concentration (0.5%) of the initial age was measured. As a result, the penetration depth was about 6 mm, and the amount of sulfur penetration was 6% or less as calculated from the area of the EPMA photograph, and the sulfur concentration on the surface was 4%.
【００１６】[0016]
【比較例１】バリウムイオンでイオン交換処理したベン
トナイトの代わりに、イオン交換処理していないベント
ナイト４００重量部を用いた以外は、実施例１と同様に
供試体を得、イオウの浸透深さを測定した。その結果、
浸透深さは１０ｍｍ以上であり、またイオウ浸透量をＥ
ＰＭＡ写真の面積から計算したところ１０％以上で、表
面におけるイオウ濃度も８％であった。Comparative Example 1 A specimen was prepared in the same manner as in Example 1 except that 400 parts by weight of bentonite that had not been subjected to ion exchange treatment was used in place of bentonite that had been subjected to ion exchange treatment with barium ions. It was measured. as a result,
The penetration depth is 10 mm or more, and the sulfur penetration amount is E
When calculated from the area of the PMA photograph, it was 10% or more, and the sulfur concentration on the surface was 8%.
Claims (1)
与された遮蔽材であって、前記ベントナイトが、バリウ
ムイオンとイオン交換処理したベントナイトを含有する
ことを特徴とする耐硫酸塩用遮蔽材。1. A shielding material having bentonite-containing sulfate resistance, wherein the bentonite contains bentonite ion-exchanged with barium ions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01323696A JP3215791B2 (en) | 1996-01-29 | 1996-01-29 | Sulfate-resistant shielding material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01323696A JP3215791B2 (en) | 1996-01-29 | 1996-01-29 | Sulfate-resistant shielding material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09211189A true JPH09211189A (en) | 1997-08-15 |
| JP3215791B2 JP3215791B2 (en) | 2001-10-09 |
Family
ID=11827569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01323696A Expired - Fee Related JP3215791B2 (en) | 1996-01-29 | 1996-01-29 | Sulfate-resistant shielding material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3215791B2 (en) |
Cited By (1)
| 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 |
-
1996
- 1996-01-29 JP JP01323696A patent/JP3215791B2/en not_active Expired - Fee Related
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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3215791B2 (en) | 2001-10-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |