JP2014202646A - Ground consolidation method - Google Patents
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- JP2014202646A JP2014202646A JP2013080014A JP2013080014A JP2014202646A JP 2014202646 A JP2014202646 A JP 2014202646A JP 2013080014 A JP2013080014 A JP 2013080014A JP 2013080014 A JP2013080014 A JP 2013080014A JP 2014202646 A JP2014202646 A JP 2014202646A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000007596 consolidation process Methods 0.000 title claims abstract description 29
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- 238000007711 solidification Methods 0.000 claims abstract description 53
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- 238000005507 spraying Methods 0.000 abstract description 14
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- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
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- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
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- 229910001508 alkali metal halide Inorganic materials 0.000 description 1
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- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 229910001615 alkaline earth metal halide Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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- 210000004556 brain Anatomy 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
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- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
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- 235000012208 gluconic acid Nutrition 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
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- 238000002347 injection Methods 0.000 description 1
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- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
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- 235000009566 rice Nutrition 0.000 description 1
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- 235000002639 sodium chloride Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、例えば、放射性物質に汚染された農地表層土を固化して、放射性物質を除去するための技術である。本発明は、例えば、放射性物質で汚染された農地から再び放射性物質が拡散しないよう防止するために、固化材を農地表層に散布し、放射性物質を封じ込め、短期間に表層土を削り取る地盤固結方法に関する。 The present invention is, for example, a technique for solidifying agricultural soil surface soil contaminated with radioactive substances to remove the radioactive substances. For example, in order to prevent the radioactive material from diffusing again from the farmland contaminated with radioactive material, the present invention is applied to the ground consolidation by spreading the solidified material on the surface of the agricultural land, containing the radioactive material, and scraping the surface soil in a short time. Regarding the method.
汚染された農地から再び放射性物質が拡散するのを防ぐために、マグネシウム系固化材をプラントで水と練混ぜてスラリー化し、そのスラリーをポンプで農地表層土に散布している。マグネシウム系固化材を使用した場合、プラントでバッチ練りして運搬しているために、練混ぜ作業、ポンプで散布する作業、作業後にプラントやポンプを掃除する作業が必要であり、かなりの労力がかった。 In order to prevent the radioactive material from diffusing again from the contaminated farmland, the magnesium-based solidified material is kneaded with water at the plant to form a slurry, and the slurry is sprayed onto the farmland surface soil. When magnesium-based solidification material is used, since it is batch-kneaded and transported at the plant, mixing work, spraying with a pump, and work after cleaning the plant and pump are necessary, which requires considerable labor. It was.
マグネシウム系固化材は、完全に固化するまで少なくとも３〜７日程度必要とするために、散布前の表層土に水溜まりがある場合や、養生期間中に降雨が発生した場合には、固化材が希釈により固化せず、更に養生期間が長くなり、表層土を削り取る作業が遅れることがあった。特に、冬季は低温になるため顕著であった。このように固化しないと農地から再び放射性物質が拡散するおそれがあった。 Magnesium-based solidified material requires at least 3 to 7 days until it is completely solidified. Therefore, if there is a pool of water in the surface soil before spraying or if rainfall occurs during the curing period, Dilution did not solidify, and the curing period became longer, and the work of scraping the surface soil could be delayed. This was particularly noticeable in winter due to low temperatures. If it did not solidify in this way, there was a risk that radioactive material would diffuse again from the farmland.
農地に散布する場合、アルカリ性の高いセメントは使用しにくかった。固化材が硫酸塩を含むと、嫌気性バクテリアにより硫酸塩が反応し、硫酸ガスを生じ、その後の稲の生育を阻害するおそれがあった。一般的なセメント系固化材は石膏を含むため、硫化水素が発生する可能性があり、使用できなかった（非特許文献１，２） When spraying on farmland, cement with high alkalinity was difficult to use. When the solidified material contains sulfate, the sulfate reacts with anaerobic bacteria to generate sulfuric acid gas, which may hinder the subsequent growth of rice. Since general cement-based solidified materials contain gypsum, hydrogen sulfide may be generated and cannot be used (Non-Patent Documents 1 and 2)
放射性廃棄物の固化方法としては、放射性廃棄物をアルカリで処理した後、高炉スラグを混合し、必要に応じて硬化速度を速めるために、１２ＣａＯ・７Ａｌ２Ｏ３や１１ＣａＯ・７Ａｌ２Ｏ３・ＣａＸ２等のカルシウムアルミネートを添加する方法が提案されている。この技術は、一度放射性廃棄物をアルカリで処理した後に、高炉スラグとカルシウムアルミネートを混合して固化させる方法である（特許文献１）。放射性廃棄物を含有する汚染水の固化処理方法としては、カルシウムアルミネート、石膏、更にベントナイト又はゼオライトを含有する固化材で固化して、埋設処理する方法が提案されている。この技術は、カルシウムアルミネートを主成分としているが、高炉スラグを含有しない固化材であり、放射性廃棄物を含む汚染水を固化する方法である（特許文献２）。いずれの技術も、高炉スラグとカルシウムアルミネートを配合した固化材に加水して連続スラリー化し、そのスラリーを放射性物質で汚染された表層土に散布して表層のみを固化させる本発明とは異なるものであり、カルシウムアルミネートの最適ＣａＯ／Ａｌ２Ｏ３モル比も示されていない。 As a method for solidifying radioactive waste, after treating the radioactive waste with alkali, blast furnace slag is mixed, and in order to increase the curing speed as necessary, 12CaO · 7Al 2 O 3 or 11CaO · 7Al 2 O 3. A method of adding calcium aluminate such as CaX 2 has been proposed. This technique is a method in which radioactive waste is once treated with alkali, and then blast furnace slag and calcium aluminate are mixed and solidified (Patent Document 1). As a method for solidifying contaminated water containing radioactive waste, there has been proposed a method of solidifying with a solidification material containing calcium aluminate, gypsum, bentonite or zeolite, and embedding it. This technique is a solidified material containing calcium aluminate as a main component but not containing blast furnace slag, and is a method of solidifying contaminated water containing radioactive waste (Patent Document 2). Both technologies are different from the present invention in which only a surface layer is solidified by adding water to a solidified material containing blast furnace slag and calcium aluminate to form a continuous slurry and spraying the slurry onto surface soil contaminated with radioactive substances. The optimum CaO / Al 2 O 3 molar ratio of calcium aluminate is also not shown.
セメントを用いない固化材を用いた固化方法としては、カルシウムアルミネートとスラグを主成分とする懸濁型固化材を水ガラスや水溶性シリカ化合物と併用して地盤に注入し、固結する工法が提案されている（特許文献３〜５）。この技術は、カルシウムアルミネート、スラグ、石膏、ベントナイトを組み合わせて、遅延剤を併用して、固化材１００質量部に対して、水５００〜６００質量部で練混ぜた高水比の注入材である。この技術は、カルシウムアルミネートの最適ＣａＯ／Ａｌ２Ｏ３モル比、固化時間、強度発現性が示されていない点で、本発明と異なる。 As a solidification method using a solidification material that does not use cement, a suspension solidification material mainly composed of calcium aluminate and slag is used in combination with water glass or a water-soluble silica compound to inject into the ground and solidify. Has been proposed (Patent Documents 3 to 5). This technique is a high water ratio injection material that is a mixture of calcium aluminate, slag, gypsum, bentonite, and combined with a retarder, and is mixed with 500 to 600 parts by mass of water with respect to 100 parts by mass of the solidified material. is there. This technique differs from the present invention in that the optimum CaO / Al 2 O 3 molar ratio, solidification time, and strength development of calcium aluminate are not shown.
セメントに、カルシウムアルミネート、石膏、高性能減水剤を配合した放射性廃棄物の固化剤が提案されている（特許文献６〜８）。この技術は、セメントにカルシウムアルミネートや石膏を配合した急硬セメントを、放射性廃棄物と練混ぜて固化させる技術である。この技術は、セメントを含まない高炉スラグにカルシウムアルミネートを配合した固化材を、圧縮空気で空気圧送し、固化材に水を送給して連続スラリー化して、放射性物質が堆積した表層面に散布して表層を固化させる本発明とは異なる。 A solidifying agent for radioactive waste in which calcium aluminate, gypsum, and a high-performance water reducing agent are blended in cement has been proposed (Patent Documents 6 to 8). This technology is a technology in which hardened cement containing calcium aluminate or gypsum in cement is mixed with radioactive waste and solidified. In this technology, solidified material containing calcium aluminate blended with blast furnace slag containing no cement is pneumatically fed with compressed air, and water is fed to the solidified material to form a continuous slurry. This is different from the present invention in which the surface layer is solidified by spraying.
カルシウムアルミネートを主成分とする粉末急結剤をスラリー化して、セメントコンクリートに添加する急結剤がトンネル現場で用いられている（特許文献７〜９）。この技術は、カルシウムアルミネートを主成分とする急結剤を単独で使用しないで、必ずコンクリートに添加して使用するものであり、農地表層土に急結剤スラリーのみを吹付けて、表層土を固化させた実施例がない。 The quick setting agent which makes the powder quick setting agent which has a calcium aluminate as a main component into a slurry, and adds to cement concrete is used in the tunnel field (patent documents 7-9). This technology does not use a quick-setting agent based on calcium aluminate alone, but is always added to concrete, and sprays only the quick-set slurry on the surface soil of agricultural land. There is no example in which is solidified.
本発明は、例えば、表層土に水溜まりがあっても、冬季間であっても、マグネシウム系固化材のように長い養生期間を必要とせずに固化するため、放射性物質を再拡散させずに、短期間で表層土を削り取る除染作業を速やかに実施できる地盤固結方法を提供する。 In the present invention, for example, even if there is a puddle in the surface soil, even during the winter season, solidification without requiring a long curing period like a magnesium-based solidified material, without re-diffusing radioactive substances, To provide a ground consolidation method capable of quickly carrying out decontamination work for scraping surface soil in a short period of time.
本発明は、高炉スラグとカルシウムアルミネート類を含有する固化材１００質量部を送給し、途中で、水７０〜３００質量部を混合して固化材スラリーとし、該固化材スラリーを地盤に散布して、地盤を固化する地盤固結方法であり、カルシウムアルミネート類のＣａＯ／Ａｌ２Ｏ３モル比が１．７〜３．０である該地盤固結方法であり、カルシウムアルミネート類の使用量が、高炉スラグ１００質量部に対して１０〜１００質量部である該地盤固結方法であり、固化材が硫酸塩を含有しない該地盤固結方法であり、固化材がセメントを含有しない該地盤固結方法であり、固化材が繊維を含有する該地盤固結方法であり、繊維の長さが３〜１０ｍｍである該地盤固結方法であり、固化材を空気圧送により送給する該地盤固結方法であり、固化材を連続的に固化材スラリー化する該地盤固結方法であり、固化材を大気圧換算で２〜７ｍ３／ｍｉｎの圧縮空気で空気圧送し、固化材供給管の周囲より加水し、固化材を連続的にスラリー化する該地盤固結方法であり、地盤が土壌である該地盤固結方法であり、固化材が放射性廃棄物用固化材であり、地盤が放射性廃棄物で汚染された土壌である該地盤固結方法であり、該地盤固結方法に使用する固化材であり、該地盤固結方法に使用する固化材スラリーであり、高炉スラグとカルシウムアルミネート類を含有する固化材１００質量部と、水７０〜３００質量部とを混合した固化材スラリーである。 In the present invention, 100 parts by mass of solidified material containing blast furnace slag and calcium aluminate is fed, and 70 to 300 parts by mass of water is mixed to form a solidified material slurry, and the solidified material slurry is dispersed on the ground. And a ground consolidation method for solidifying the ground, wherein the calcium aluminate has a CaO / Al 2 O 3 molar ratio of 1.7 to 3.0. The ground consolidation method is used in an amount of 10 to 100 parts by mass with respect to 100 parts by mass of blast furnace slag, the solidification method is a ground consolidation method that does not contain sulfate, and the solidification material does not contain cement. The ground consolidation method, the solidification method in which the solidification material contains fibers, the ground consolidation method in which the length of the fibers is 3 to 10 mm, and the solidification material is fed by pneumatic feeding. The ground consolidation method, A該地Release consolidation method for continuously consolidated material slurried wood, the solidifying material to feed air pressure compressed air 2~7m 3 / min at atmospheric pressure conversion, hydro than the surrounding solidifying material supply tube, solidification It is the ground consolidation method in which the material is continuously slurryed, the ground consolidation method in which the ground is soil, the solidified material is a solidified material for radioactive waste, and the ground is contaminated with radioactive waste The soil consolidation method, which is soil, a solidification material used for the ground consolidation method, a solidification material slurry used for the ground consolidation method, and a solidification material containing blast furnace slag and calcium aluminates It is a solidified material slurry in which 100 parts by mass and 70 to 300 parts by mass of water are mixed.
本発明は、例えば、固化材スラリーを、連続して製造すると同時に農地表層土に散布することができるために、効率的な作業ができる。本発明は、例えば、散布後、固化材スラリーの養生期間が短いために、放射性物質を再拡散させずに、速やかに除染作業を行うことができる。 In the present invention, for example, the solidifying material slurry can be continuously produced and simultaneously applied to the agricultural land surface soil, so that an efficient operation can be performed. In the present invention, for example, since the curing period of the solidifying material slurry is short after spraying, the decontamination work can be performed quickly without re-diffusion of radioactive material.
以下、本発明を詳細に説明するが、本発明はこれに限られるものではない。 Hereinafter, the present invention will be described in detail, but the present invention is not limited thereto.
図１は、本発明で用いる固化材スラリーの製造装置の一構成例を示したものである。 FIG. 1 shows an example of the configuration of a solidifying material slurry production apparatus used in the present invention.
本発明は、高炉スラグとカルシウムアルミネート類を含有する固化材１００質量部を送給し、途中で、水７０〜３００質量部を混合して固化材スラリーとし、該固化材スラリーを地盤に散布して、地盤を固化する地盤固結方法である。 In the present invention, 100 parts by mass of solidified material containing blast furnace slag and calcium aluminate is fed, and 70 to 300 parts by mass of water is mixed to form a solidified material slurry, and the solidified material slurry is dispersed on the ground. Then, it is a ground consolidation method for solidifying the ground.
本発明は、例えば、固化材を、空気圧送し、途中で、水を送給して連続スラリー化し、地盤に散布して、地盤を固化することが好ましい。本発明は、例えば、固化材を空気圧送し、固化材供給管の周囲より加水し、連続的にスラリー化し、地盤に散布して、地盤を固化することがより好ましい。地盤としては、効果が大きい点で、農地表層が好ましく、放射性廃棄物で汚染された農地表層土がより好ましい。 In the present invention, for example, it is preferable to solidify the ground by pneumatically feeding the solidified material and feeding water on the way to form a continuous slurry and spraying it on the ground. In the present invention, for example, it is more preferable to solidify the ground by pneumatically feeding the solidified material, adding water from the periphery of the solidified material supply pipe, continuously slurrying it, and spraying it on the ground. As the ground, an agricultural land surface layer is preferable in terms of a large effect, and an agricultural land surface soil contaminated with radioactive waste is more preferable.
固化材をスラリー化するために使用する水（符号４）を水ポンプ（符号２）で固化材スラリー化装置（符号１）に導入し、固化材供給管Ａ（供給管Ａ）の周囲から加水することにより、固化材を連続してスラリー化することができる。 Water (symbol 4) used for slurrying the solidified material is introduced into the solidified material slurrying device (symbol 1) by a water pump (symbol 2), and water is added from the periphery of the solidified material supply pipe A (supply pipe A). By doing so, the solidified material can be continuously slurried.
例えば、添加機（符号３）で固化材を空気圧送する圧縮空気の流量は、安定してスラリー化できる点で、大気圧換算で２〜７ｍ３／ｍｉｎが好ましく、３〜６ｍ３／ｍｉｎがより好ましい。２ｍ３／ｍｉｎ未満であると固化材スラリー化装置内で固化材が滞留、固化して閉塞し、安定してスラリー化できない場合がある。７ｍ３／ｍｉｎを超えるとミストが飛散して粉じんが多くなる場合がある。圧縮空気は、コンプレッサー（符号５）により、添加機（符号３）へ送給する。添加機としては、急結剤添加機「デンカＮＡＴＭクリ−ト」等が挙げられる。 For example, the flow rate of the compressed air feed pneumatically solidifying material in addition machine (reference numeral 3), in that it can stably slurry is preferably 2~7m 3 / min at atmospheric pressure conversion, 3 to 6 m 3 / min is More preferred. If it is less than 2 m 3 / min, the solidified material may stay in the solidified material slurrying device, solidify and close, and may not be stably slurried. If it exceeds 7 m 3 / min, mist may scatter and dust may increase. The compressed air is fed to the adder (symbol 3) by a compressor (symbol 5). Examples of the adding machine include a quick setting agent adding machine “Denka NATM Creat” and the like.
水を圧送する圧力は、固化材の輸送圧より少なくとも０．１ＭＰａ以上大きくすることが好ましい。０．１ＭＰａ未満だと、固化材を安定してスラリー化できない場合がある。 The pressure at which water is pumped is preferably at least 0.1 MPa greater than the transport pressure of the solidified material. If it is less than 0.1 MPa, the solidified material may not be stably slurried.
本発明で使用する固化材スラリー化装置（符号１）は、固化材を送給する固化材供給管Ａ、水が合流する吐出管Ｂ、水を送給する水供給管Ｃから構成されている。固化材供給管Ａは固化材圧送管７に接続し、吐出管Ｂは輸送管ホース６に接続されている。水供給管Ｃは、その外周で水圧送管８に接続されている。固化材供給管Ａと吐出管Ｂは対峙するように配置されている。水供給管Ｃは、固化材供給管Ａと吐出管Ｂの対峙部分を覆うように設置されている。固化材供給管Ａの内径は。吐出管Ｂの内径より小さい。固化材供給管Ａと吐出管Ｂの間隙から、水供給管Ｃから送給される水を吐出管Ｂに送給する。 The solidifying material slurrying apparatus (reference numeral 1) used in the present invention is composed of a solidifying material supply pipe A that feeds the solidifying material, a discharge pipe B that joins water, and a water supply pipe C that feeds water. . The solidified material supply pipe A is connected to the solidified material pumping pipe 7, and the discharge pipe B is connected to the transport pipe hose 6. The water supply pipe C is connected to the water pressure feed pipe 8 at the outer periphery thereof. The solidifying material supply pipe A and the discharge pipe B are arranged so as to face each other. The water supply pipe C is installed so as to cover the facing part of the solidification material supply pipe A and the discharge pipe B. What is the inner diameter of the solidification material supply pipe A? It is smaller than the inner diameter of the discharge pipe B. Water supplied from the water supply pipe C is supplied to the discharge pipe B from the gap between the solidification material supply pipe A and the discharge pipe B.
（固化材供給管Ａの内径ｄ）／（吐出管Ｂの内径Ｄ）で示す内径比（ｄ／Ｄ）は０．３〜０．９５が好ましい。内径比（ｄ／Ｄ）が小さいと固化材供給管Ａと吐出管Ｂの間隙に固化材が滞留して固化して閉塞する場合があり、内径比（ｄ／Ｄ）が大きいと水が安定して送給されにくいため、固化材を安定してスラリー化することができず、固化して閉塞する場合がある。 The inner diameter ratio (d / D) represented by (the inner diameter d of the solidifying material supply pipe A) / (the inner diameter D of the discharge pipe B) is preferably 0.3 to 0.95. If the inner diameter ratio (d / D) is small, the solidifying material may stay in the gap between the solidifying material supply pipe A and the discharge pipe B and solidify and close, and if the inner diameter ratio (d / D) is large, the water is stable. Therefore, the solidified material cannot be stably slurried and may solidify and become clogged.
固化材スラリー化装置（符号１）で製造された固化材スラリーは、輸送管ホース（符号６）を通り、排出され、農地表層土へ散布される。輸送管ホース（符号６）の長さは、固化材スラリー化装置（符号１）を地面に置いて、作業員が取り回しできる長さであれば良く、そのためには１〜２ｍが好ましい。１ｍ未満であるとスラリー化装置を地面に置くことができにくいため、ホースの取り回しができない場合があり、２ｍを超えるとホース内でスラリーが固結して閉塞する場合がある。 The solidified material slurry produced by the solidified material slurrying device (symbol 1) passes through the transport pipe hose (symbol 6) and is discharged and sprayed onto the farmland surface soil. The length of the transport pipe hose (symbol 6) may be any length as long as the solidifying material slurrying apparatus (symbol 1) can be placed on the ground and can be handled by an operator. If it is less than 1 m, it is difficult to place the slurrying apparatus on the ground, so that the hose may not be routed. If it exceeds 2 m, the slurry may solidify in the hose and clog.
本発明で使用する高炉スラグは、銑鉄を製造するときに発生する鉄鋼スラグを粉砕して製造されるものであり、一般的な高炉セメントやコンクリート用混和材として用いられているものである。高炉スラグの組成は、効果が大きい点で、高炉スラグ１００部質量中、ＣａＯ３９〜４５質量部、Ａｌ２Ｏ３１２〜１６質量部、ＳｉＯ２３２〜３６質量部が好ましく、ＣａＯ４０〜４４質量部、Ａｌ２Ｏ３１３〜１５質量部、ＳｉＯ ２３３〜３５質量部がより好ましい。高炉スラグの粉末度はブレーン比表面積で４０００ｃｍ２／ｇ以上が好ましく、５０００ｃｍ２／ｇ以上がより好ましい。４０００ｃｍ２／ｇ未満であると、固化材スラリーの固化時間や強度発現性が低下する場合がある。 The blast furnace slag used in the present invention is produced by pulverizing steel slag generated when producing pig iron, and is used as a general blast furnace cement or concrete admixture. The composition of the blast furnace slag has a great effect. Among 100 parts by mass of the blast furnace slag, 39 to 45 parts by mass of CaO, 12 to 16 parts by mass of Al 2 O 3 , and 32 to 36 parts by mass of SiO 2 are preferable, and 40 to 44 parts by mass of CaO. Al 2 O 3 13 to 15 parts by mass and SiO 2 33 to 35 parts by mass are more preferable. Fineness of the blast furnace slag is preferably at least 4000 cm 2 / g in Blaine specific surface area, 5000 cm 2 / g or more is more preferable. If it is less than 4000 cm 2 / g, the solidification time and strength development of the solidified material slurry may decrease.
本発明で使用するカルシウムアルミネート類は、カルシア原料とアルミナ原料を混合して、キルンでの焼成或いは電気炉で溶融し、急冷して得られるＣａＯとＡｌ２Ｏ３とを主成分とする水和活性を有する物質の総称である。ＣａＯとＡｌ２Ｏ３のモル比は、１．７〜３．０が好ましく、２．０〜２．５がより好ましく、更にＣａＯやＡｌ２Ｏ３の一部が、アルカリ金属酸化物、アルカリ土類金属酸化物、酸化ケイ素、酸化チタン、酸化鉄、アルカリ金属ハロゲン化物、アルカリ土類金属ハロゲン化物、アルカリ金属硫酸塩、及びアルカリ土類金属硫酸塩等と置換した化合物、或いは、ＣａＯとＡｌ２Ｏ３とを主成分とするものに、これらが少量固溶した化合物も使用できる。モル比が１．７未満であると短時間に固化せずに、強度発現性が低下する場合があり、モル比が３．０を超えると短時間で固化しても、強度発現性が低下する場合がある。 The calcium aluminate used in the present invention is a water mainly composed of CaO and Al 2 O 3 obtained by mixing a calcia raw material and an alumina raw material, calcination in a kiln or melting in an electric furnace, and rapid cooling. It is a general term for substances having sum activity. The molar ratio of CaO to Al 2 O 3 is preferably 1.7 to 3.0, more preferably 2.0 to 2.5, and some of CaO and Al 2 O 3 are alkali metal oxides and alkalis. Compounds substituted with earth metal oxide, silicon oxide, titanium oxide, iron oxide, alkali metal halide, alkaline earth metal halide, alkali metal sulfate, alkaline earth metal sulfate, etc., or CaO and Al A compound containing 2 O 3 as a main component and a solid solution of these in a small amount can also be used. If the molar ratio is less than 1.7, the strength developability may decrease without solidifying in a short time, and if the molar ratio exceeds 3.0, the strength developability may decrease even if solidified in a short time. There is a case.
カルシウムアルミネート類のガラス化率は、反応活性の点で７０％以上が好ましく、９０％以上がより好ましい。ガラス化率は加熱前のサンプルについて、粉末Ｘ線回折法により結晶鉱物のメインピーク面積Ｓを予め測定し、その後１０００℃で２時間加熱後、１〜１０℃／分の冷却速度で徐冷し、粉末Ｘ線回折法による加熱後の結晶鉱物のメインピーク面積Ｓ０を求め、更に、これらのＳ０及びＳの値を用い、下記の式を用いてガラス化率χを算出する。
ガラス化率χ（％）＝１００×（１−Ｓ／Ｓ０）
The vitrification rate of calcium aluminates is preferably 70% or more, more preferably 90% or more in terms of reaction activity. As for the vitrification rate, the main peak area S of the crystalline mineral was measured in advance by a powder X-ray diffraction method for the sample before heating, then heated at 1000 ° C. for 2 hours, and then slowly cooled at a cooling rate of 1 to 10 ° C./min. Then, the main peak area S 0 of the crystal mineral after heating by the powder X-ray diffraction method is obtained, and further, the vitrification ratio χ is calculated using the following formula using these S 0 and S values.
Vitrification rate χ (%) = 100 × (1−S / S 0 )
カルシウムアルミネート類の粒度は、急結性や初期強度発現性の点で、ブレーン比表面積（以下、ブレーン値という）３０００ｃｍ２／ｇ以上が好ましく、５０００ｃｍ２／ｇ以上がより好ましい。ブレーン値が小さいと、高炉スラグ粉末との反応が低下して、固化材スラリーの固化時間や強度発現性が低下する場合がある。 The particle size of the calcium aluminates is in terms of quick-setting property and the initial strength development, Blaine specific surface area (hereinafter, referred to as Blaine) 3000 cm 2 / g or more is preferable, 5000 cm 2 / g or more is more preferable. When the brane value is small, the reaction with the blast furnace slag powder may decrease, and the solidification time and strength development of the solidified material slurry may decrease.
カルシウムアルミネート類の使用量は、高炉スラグ１００質量部に対して、１０〜１００質量部が好ましく、３０〜７０質量部がより好ましい。１０質量部未満では固化材スラリーの固化時間や強度発現性が低下する場合があり、１００質量部を超えると急激に固化するため、固化材スラリー化装置（符号１）内で固化材がスケーリングして固結し、閉塞し、強度が低下し、更に、材料コストが高くなり、経済的でない場合がある。強度発現性が低いと、堆積した放射性物質を含む表層土を剥ぎ取る効果が低下する場合がある。 10-100 mass parts is preferable with respect to 100 mass parts of blast furnace slag, and, as for the usage-amount of calcium aluminates, 30-70 mass parts is more preferable. If the amount is less than 10 parts by mass, the solidification time and strength development of the solidified material slurry may be reduced. If the amount exceeds 100 parts by mass, the solidified material is rapidly solidified, and the solidified material is scaled in the solidified material slurrying apparatus (reference numeral 1). May solidify, block, reduce strength, increase material costs, and may not be economical. If strength development is low, the effect of stripping the surface soil containing the deposited radioactive material may be reduced.
固化材は、石膏等の硫酸塩を、固化材１００部中、３質量以下含有することが好ましく、１質量以下含有することがより好ましく、硫酸塩を含有しないことが最も好ましい。
固化材は、セメントを、固化材１００部中、３質量以下含有することが好ましく、１質量以下含有することがより好ましく、セメントを含有しないことが最も好ましい。
The solidifying material preferably contains 3 parts by mass or less of sulfate such as gypsum, more preferably 1 mass or less, and most preferably no sulfate is contained in 100 parts of the solidifying material.
The solidifying material preferably contains 3 mass or less of cement in 100 parts of the solidifying material, more preferably 1 mass or less, and most preferably no cement.
表層土を削り取る面積を大きくし、放射性物質を除去しやすくするために、繊維を使用してもよい。本発明で使用する繊維は、固化材に混合する。繊維は、無機質、有機質いずれも使用できる。無機質繊維としては、ガラス繊維、炭素繊維、ロックウール、石綿、セラミック繊維等が挙げられる。有機質繊維としては、ビニロン繊維、ポリプロピル繊維、アクリル繊維、ポリエチレン繊維、アラミド繊維、セルロース繊維、パルプ、麻、木毛等が挙げられる。繊維の長さは、３〜１０ｍｍが好ましい。３ｍｍ未満では表層土の削り取る面積が小さくなる場合があり、１０ｍｍを超えると固化材が固化材スラリー化装置内で滞留してスケーリングし、固結して閉塞する場合がある。 Fibers may be used to increase the area where the surface soil is scraped and to facilitate removal of radioactive material. The fiber used in the present invention is mixed with the solidified material. Both inorganic and organic fibers can be used. Examples of the inorganic fiber include glass fiber, carbon fiber, rock wool, asbestos, and ceramic fiber. Examples of the organic fiber include vinylon fiber, polypropyl fiber, acrylic fiber, polyethylene fiber, aramid fiber, cellulose fiber, pulp, hemp, and wood wool. The length of the fiber is preferably 3 to 10 mm. If it is less than 3 mm, the area of the surface soil to be scraped may be small, and if it exceeds 10 mm, the solidified material may stay in the solidified material slurrying device, scale, solidify, and close.
繊維の使用量は、固化材１００質量部に対して０〜３質量部が好ましく、１〜３質量部がより好ましい。配合しない場合は、表層土の削り取る面積が小さくなる場合があり、３質量部を超えると固化材圧送時に、固化材が固化材スラリー化装置内で滞留して閉塞する場合がある。 0-3 mass parts is preferable with respect to 100 mass parts of solidification materials, and, as for the usage-amount of a fiber, 1-3 mass parts is more preferable. When not blended, the area of the surface soil to be scraped may be reduced. When the amount exceeds 3 parts by mass, the solidified material may stay in the solidified material slurrying device and clog when solidified material is fed.
本発明で使用する固化材には、クエン酸、グルコン酸、酒石酸等のオキシカルボン酸、又はその塩、アルカリ金属炭酸塩等を併用することができる。 In the solidifying material used in the present invention, oxycarboxylic acids such as citric acid, gluconic acid and tartaric acid, or salts thereof, alkali metal carbonates and the like can be used in combination.
本発明では、他に酸化カルシウム、酸化マグネシウム、水酸化カルシウム、水酸化マグネシウム、炭酸カルシウム、フライアッシュ、減水剤、高性能減水剤、ＡＥ剤、ＡＥ減水剤、増粘剤、高分子エマルジョン等のうちの一種又は二種以上を併用してもよい。 In the present invention, calcium oxide, magnesium oxide, calcium hydroxide, magnesium hydroxide, calcium carbonate, fly ash, water reducing agent, high performance water reducing agent, AE agent, AE water reducing agent, thickener, polymer emulsion, etc. One or two or more of them may be used in combination.
本発明で使用する固化材スラリー中の水量は、固化材１００質量部に対して７０〜３００質量部が好ましく、１００〜２００質量部がより好ましい。７０質量部未満では固化材スラリーを均一に散布できない場合があり、経済的でなく、固化材スラリーの粘度が上昇し、吐出管内でスケーリングして固化し、閉塞する場合がある。３００質量部を超えると固化材スラリーの固化時間が遅れ、強度発現性が低下し、堆積した放射性物質を含む表層土を剥ぎ取る効果が低下する場合がある。 70-300 mass parts is preferable with respect to 100 mass parts of solidification materials, and, as for the amount of water in the solidification material slurry used by this invention, 100-200 mass parts is more preferable. If the amount is less than 70 parts by mass, the solidifying material slurry may not be uniformly dispersed, which is not economical, and the viscosity of the solidifying material slurry may increase, and may be scaled and solidified in the discharge pipe, and may be blocked. If it exceeds 300 parts by mass, the solidification time of the solidifying material slurry is delayed, the strength development is reduced, and the effect of peeling off the surface soil containing the deposited radioactive material may be reduced.
以下、実施例により本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail by way of examples.
実施例１
高炉スラグ１００質量部に対して、カルシウムアルミネート類を表１に示す量混合して固化材を調製し、固化材１００質量部に対して水２００質量部を加え、練混ぜて、固化材スラリーを調製した。固化材スラリーについて、固化時間と圧縮強度を測定した。結果を表１に併記する。
Example 1
To 100 parts by mass of blast furnace slag, calcium aluminates are mixed in the amounts shown in Table 1 to prepare a solidified material, 200 parts by mass of water are added to 100 parts by mass of the solidified material, and the mixture is kneaded to obtain a solidified material slurry. Was prepared. About the solidification material slurry, the solidification time and the compressive strength were measured. The results are also shown in Table 1.
＜使用材料＞
高炉スラグ：市販の高炉スラグ粉末、高炉スラグ１００部質量中、ＣａＯ４１〜４３質量部、Ａｌ２Ｏ３１３〜１５質量部、ＳｉＯ２３３〜３４質量部、ブレーン比表面積６０００ｃｍ２
カルシウムアルミネート類：ＣａＯ／Ａｌ２Ｏ３モル比２．２、非晶質、ガラス化率９５％、ブレーン比表面積５０００ｃｍ２
<Materials used>
Blast furnace slag: Commercially available blast furnace slag powder, 100 parts by mass of blast furnace slag, 41 to 43 parts by mass of CaO, 13 to 15 parts by mass of Al 2 O 3 , 33 to 34 parts by mass of SiO 2 , and a specific surface area of brain of 6000 cm 2.
Calcium aluminates: CaO / Al 2 O 3 molar ratio 2.2, amorphous, vitrification rate 95%, Blaine specific surface area 5000 cm 2
＜測定方法＞
ブレーン比表面積：ＪＩＳＲ５２０１に準じて測定した。
固化時間：固化材スラリーを調製してから、固化材スラリーの流動性がなくなるまでの時間を、固化時間とした。
圧縮強度：ＪＩＳＲ５２０１に準じて測定した。材齢１日までは２０℃気乾養生、以降は標準養生とした。
<Measurement method>
Blaine specific surface area: measured according to JIS R5201.
Solidification time: The time from the preparation of the solidification material slurry to the disappearance of the fluidity of the solidification material slurry was defined as the solidification time.
Compressive strength: measured according to JIS R5201. Up to 1 day of material age, air-drying curing at 20 ° C., and thereafter standard curing.
実施例２
高炉スラグ１００質量部に対して、表２に示すＣａＯ／Ａｌ２Ｏ３モル比を有するカルシウムアルミネート類５０質量部を混合して固化材を調製したこと以外は、実施例１と同様の試験を実施した。結果を表２に併記する。
Example 2
Test similar to Example 1 except that 50 mass parts of calcium aluminates having a CaO / Al 2 O 3 molar ratio shown in Table 2 were mixed with 100 mass parts of blast furnace slag to prepare a solidified material. Carried out. The results are also shown in Table 2.
実施例３
表３に示すブレーン値を有する高炉スラグ１００質量部に対して、表３に示すブレーン値を有するカルシウムアルミネート類５０質量部を混合して固化材を調製したこと以外は、実施例１と同様の試験を実施した。結果を表３に併記する。
Example 3
Example 1 except that 50 parts by mass of calcium aluminates having the brane values shown in Table 3 were mixed with 100 parts by mass of blast furnace slag having the brane values shown in Table 3 to prepare a solidified material. The test was conducted. The results are also shown in Table 3.
実施例４
図１に従い、固化材スラリーを散布した。下記特記したこと以外は、実施例１と同様に試験した。
添加機「デンカＮＡＴＭクリート」（符号３）に配管口径１Ｂ（内径２５ｍｍ）のホースを取付けた。添加機（符号３）から固化材スラリー化装置（符号１）まで０．４Ｍｐａの圧力と５ｍ３／ｍｉｎの空気量で、固化材を空気輸送した。固化材スラリー化装置（符号１）に、水ポンプ（符号２）で水（符号４）を、０．６Ｍｐａの圧力で圧入した。固化材スラリー化装置（符号１）において、内径比（ｄ／Ｄ）を０．７とした。固化材スラリー化装置（符号１）の吐出管（符号Ｂ）に接続する輸送管ホース（符号６）の長さを１．５ｍとした。
Example 4
According to FIG. 1, the solidifying material slurry was sprayed. The test was performed in the same manner as in Example 1 except for the following special note.
A hose having a pipe diameter of 1B (inner diameter: 25 mm) was attached to the adding machine “DENKA NATM CLEAT” (reference numeral 3). The solidified material was pneumatically transported from the adding machine (reference numeral 3) to the solidifying material slurrying apparatus (reference numeral 1) at a pressure of 0.4 Mpa and an air amount of 5 m 3 / min. Water (symbol 4) was pressed into the solidifying material slurrying apparatus (symbol 1) with a water pump (symbol 2) at a pressure of 0.6 Mpa. In the solidifying material slurrying apparatus (reference numeral 1), the inner diameter ratio (d / D) was set to 0.7. The length of the transport pipe hose (symbol 6) connected to the discharge pipe (symbol B) of the solidifying material slurrying apparatus (symbol 1) was 1.5 m.
固化材は、高炉スラグ１００質量部に対して、カルシウムアルミネート類４０質量部を混合したものを使用した。固化材をスラリー化する水は、固化材１００質量部に対して表４に示す量を使用した。固化材スラリーを吐出し、固化材スラリーの固化時間、圧縮強度、残留ヨウ素量を測定した。固化材スラリー化装置のスケーリング状態は、添加機「デンカＮＡＴＭクリート」の圧送圧で評価した。圧送圧が上がった場合は、固化材スラリー化装置内でスケーリングしたと評価した。結果を表４に併記する。 As the solidified material, a material obtained by mixing 40 parts by mass of calcium aluminates with respect to 100 parts by mass of blast furnace slag was used. The amount of water shown in Table 4 was used as water for slurrying the solidified material with respect to 100 parts by mass of the solidified material. The solidified material slurry was discharged, and the solidified time, compressive strength, and residual iodine amount of the solidified material slurry were measured. The scaling state of the solidifying material slurrying apparatus was evaluated by the pressure feeding pressure of the adding machine “Denka NATM Cleat”. When the pumping pressure increased, it was evaluated that scaling was performed in the solidifying material slurrying apparatus. The results are also shown in Table 4.
＜使用材料＞
土壌：水田の土（含水比５０％）
ヨウ化ナトリウム水溶液：水１００質量部にヨウ化ナトリウム試薬１質量部溶解した水溶液。
模擬汚染土：バットに詰めた水田の土の表面にヨウ化ナトリウム水溶液を散布して室内で一日乾燥し、調製したもの
<Materials used>
Soil: paddy soil (water content 50%)
Sodium iodide aqueous solution: An aqueous solution in which 1 part by mass of a sodium iodide reagent is dissolved in 100 parts by mass of water.
Simulated contaminated soil: Prepared by spraying sodium iodide aqueous solution on the surface of paddy soil packed in bats and drying indoors for one day
＜測定方法＞
圧送圧：添加機「デンカＮＡＴＭクリート」の圧送圧を測定した。
吹付物固化時間：固化材スラリーを輸送管ホース（符号６）先端から吐出した後、固化材スラリーの流動性がなくなるまでの時間とした。
吹付物圧縮強度：固化材スラリーを型枠に吹き付けた後、ＪＩＳＲ５２０１に準じて測定した。材齢１日までは２０℃気乾養生、以降は標準養生とした。
残留ヨウ素量：３４１ｍｍ×４８０ｍｍ×８２ｍｍのステンレスバットに、水田の土を約７５ｍｍ詰め、その表面にヨウ化ナトリウ水溶液を均一に散布して室内で一日乾燥した。その土の表面に固化材スラリーを吹き付けにより、約５ｍｍの厚さになるように散布し、７日間養生後、硬化した固化物をヘラで剥ぎ取った。その下の土を土壌表面から１０ｍｍ程度採取し、乾燥し、土壌中のヨウ素量をＩＣＰ発光分析装置で分析した。
<Measurement method>
Pressure feeding: The pressure feeding pressure of the adding machine “Denka NATM Cleat” was measured.
Sprayed material solidification time: After the solidified material slurry was discharged from the tip of the transport pipe hose (symbol 6), it was defined as the time until the fluidity of the solidified material slurry disappeared.
Sprayed material compressive strength: After spraying the solidified material slurry onto the mold, it was measured according to JIS R5201. Up to 1 day of material age, air-drying curing at 20 ° C., and thereafter standard curing.
Residual iodine amount: A stainless steel vat of 341 mm × 480 mm × 82 mm was filled with about 75 mm of paddy soil, and an aqueous solution of sodium iodide was uniformly sprayed on the surface, and the room was dried indoors for one day. The solidified material slurry was sprayed on the surface of the soil so as to have a thickness of about 5 mm, and after curing for 7 days, the hardened solidified product was peeled off with a spatula. About 10 mm of the soil below was collected from the soil surface, dried, and the amount of iodine in the soil was analyzed with an ICP emission spectrometer.
実施例５
固化材をスラリー化するための水を、固化材１００質量部に対して２００質量部使用し、固化材を空気圧送する空気量を表５に示す量にしたこと以外は実施例４と同様に試験した。結果を表５に併記する。
Example 5
As in Example 4, except that 200 parts by mass of water for slurrying the solidified material was used with respect to 100 parts by mass of the solidified material, and the amount of air for pneumatically feeding the solidified material was changed to the amount shown in Table 5. Tested. The results are also shown in Table 5.
＜測定方法＞
粉じん量：３４１ｍｍ×４８０ｍｍ×８２ｍｍのステンレスバットに、水田の土を約７５ｍｍ詰め、その表面にヨウ化ナトリウ水溶液を均一に散布して室内で一日乾燥した。その土の表面に固化材スラリーを吹き付けにより、約５ｍｍの厚さになるように散布した。吹付け場所から風下５ｍの場所で、デジタル粉塵計Ｐ５Ｌで、１分間の粉じん量を測定した。
<Measurement method>
Dust amount: A stainless steel bat measuring 341 mm × 480 mm × 82 mm was filled with about 75 mm of paddy soil, and an aqueous solution of sodium iodide was uniformly sprayed on the surface of the bat and dried indoors for one day. The solidifying material slurry was sprayed on the surface of the soil so as to have a thickness of about 5 mm. The amount of dust for 1 minute was measured with a digital dust meter P5L at a location 5 m lee from the spray location.
実施例６
固化材をスラリー化するための水を、固化材１００質量部に対して２００質量部使用し、固化材１００質量部に対して繊維を表６に示す量使用したこと以外は実施例４と同様に試験した。ここで、固化材とは、高炉スラグ、カルシウムアルミネート類、繊維を含有するものをいう。結果を表６に併記する。
Example 6
Similar to Example 4 except that 200 parts by mass of water for slurrying the solidified material was used with respect to 100 parts by mass of the solidified material, and the amount of fibers shown in Table 6 was used with respect to 100 parts by mass of the solidified material. Tested. Here, a solidification material means the thing containing a blast furnace slag, calcium aluminates, and a fiber. The results are also shown in Table 6.
＜使用材料＞
繊維ａ：市販のビニロン繊維、繊維長５ｍｍ
繊維ｂ：市販のガラス繊維、繊維長５ｍｍ
<Materials used>
Fiber a: Commercially available vinylon fiber, fiber length 5 mm
Fiber b: Commercial glass fiber, fiber length 5 mm
＜測定方法＞
削り取り質量：３４１ｍｍ×４８０ｍｍ×８２ｍｍのステンレスバットに、水田の土を約７５ｍｍ詰め、その表面にヨウ化ナトリウ水溶液を均一に散布して室内で一日乾燥した。その土の表面に固化材スラリーを吹き付けにより、約５ｍｍの厚さになるように散布し、７日間養生後、硬化した固化物を、幅５ｃｍ、長さ３ｃｍのヘラで剥ぎ取った。ヘラで削り取れた固化材の質量を測定した。
<Measurement method>
Cut-off mass: A stainless steel vat of 341 mm × 480 mm × 82 mm was filled with about 75 mm of paddy soil, and an aqueous solution of sodium iodide was uniformly sprayed on the surface thereof, and was dried indoors for one day. The solidified material slurry was sprayed on the surface of the soil so as to have a thickness of about 5 mm. After curing for 7 days, the hardened solidified product was peeled off with a spatula having a width of 5 cm and a length of 3 cm. The mass of the solidified material scraped off with a spatula was measured.
本発明によれば、例えば、以下の利用可能性を有する。本発明は、固化材スラリーを放射能汚染された農地表層に散布することにより、放射能汚染された農地から再び放射性物質が拡散するのを防止することができる。本発明は、表層土を削り取るための養生期間を長期間必要としない。本発明は、短時間に固化するために、放射性物質を再拡散させずに除染作業を速やかに実施できる。本発明は、固化材スラリーを放射性廃棄物で汚染された農地表層土に吹き付けて、表層土を固化することにより、除染することができる。 For example, the present invention has the following applicability. In the present invention, the radioactive material can be prevented from diffusing again from the radioactively contaminated farmland by spraying the solidified material slurry onto the radioactively contaminated agricultural land surface layer. The present invention does not require a long curing period for scraping off the surface soil. Since the present invention solidifies in a short time, the decontamination work can be quickly performed without re-diffusion of radioactive material. The present invention can be decontaminated by spraying the solidifying material slurry onto the agricultural soil surface soil contaminated with radioactive waste to solidify the surface soil.
１ 固化材スラリー化装置
２ 水ポンプ
３ 添加機
４ 水
５ コンプレッサー
６ 輸送管ホース
７ 固化材圧送管
８ 水圧送管
Ａ 固化材供給管
Ｂ 吐出管
Ｃ 水供給管
DESCRIPTION OF SYMBOLS 1 Solidification material slurrying apparatus 2 Water pump 3 Adder 4 Water 5 Compressor 6 Transport pipe hose 7 Solidification material pressure feed pipe 8 Water pressure feed pipe A Solidification material supply pipe B Discharge pipe C Water supply pipe
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| JP2017082092A (en) * | 2015-10-28 | 2017-05-18 | デンカ株式会社 | Soil pavement material |
| JP2018145632A (en) * | 2017-03-02 | 2018-09-20 | デンカ株式会社 | Soil pavement material |
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| "農地土壌の放射性物質除去技術（除染技術）作業の手引き 第１版", [ONLINE], JPN6017033146, 2 March 2012 (2012-03-02), JP, pages 1 - 76, ISSN: 0003631819 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014201502A (en) * | 2013-04-08 | 2014-10-27 | 電気化学工業株式会社 | Method for solidifying ground |
| JP2017082092A (en) * | 2015-10-28 | 2017-05-18 | デンカ株式会社 | Soil pavement material |
| JP2018145632A (en) * | 2017-03-02 | 2018-09-20 | デンカ株式会社 | Soil pavement material |
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