JP2019044054A - One component type neutral solidification agent - Google Patents
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本発明は、泥土を固化するのに用いられる、一剤型の中性固化剤に関する。 The present invention relates to a one-part neutral solidifying agent used to solidify mud.
現代都市土木における工事で発生する建設排泥としては、シールド工事や推進工事などから発生する泥状土のほかに、浚渫工事などから発生する高含水の軟弱土がある。これら建設排泥はいずれも高含水であり、運搬作業時に支障があるため、運搬を効率的に行なうために、これら排泥に、セメント系固化材や生石灰、石膏などの無機系材料を添加して排泥を固化することが行なわれてきた。 As construction sludge generated by construction in modern urban civil engineering, there is soft soil of high moisture content generated from dredging construction besides mud soil generated from shield construction and promotion construction. All these construction sludges are high in water content, and there is a problem during transport work, so in order to carry out transportation efficiently, inorganic sludge such as cement-based solidifying material, quick lime and gypsum are added to these sludges. It has been carried out to solidify the sludge.
しかし、上述した無機系材料を使用する場合、添加量が多く必要であり、粉塵の発生や、固化後の土が強アルカリ性を示すことが問題となっていた。さらに、添加後、固化するまでに養生時間を設ける必要があり、都市土木の作業を妨げる要因となっていた。 However, in the case of using the above-mentioned inorganic material, a large amount of addition is required, and it has been a problem that generation of dust and soil after solidification show strong alkalinity. Furthermore, after addition, it is necessary to set curing time until it solidifies, which has been a factor that impedes the work of urban civil engineering.
さらに、固化した土を再利用する際には、当該固化土が、例えばコーン指数で２００ｋＮ／ｍ２を超える強度を示すことが求められる。 Furthermore, when the solidified soil is reused, it is required that the solidified soil exhibits a strength exceeding 200 kN / m 2 in corn index, for example.
特許文献１では、高含水率の土壌を中性領域で迅速に固体化するための中性固体化剤として、無水石膏または半水石膏５５〜９５重量％と、ベントナイトまたはクレー５〜４５重量％とからなる中性固体化剤が記載されている。 In Patent Document 1, 55 to 95% by weight of anhydrite or hemihydrate gypsum and 5 to 45% by weight of bentonite or clay as a neutral solidifying agent for rapidly solidifying a high moisture content soil in a neutral region And a neutral solidifying agent is described.
特許文献２では、高含水比泥土を改質して、中性で、強度が高く、取り扱いが容易な処理土を得るために、高含水比泥土に、石膏などの固化剤を添加して撹拌した後、高分子凝集剤を添加して撹拌し、さらに吸水剤を添加して撹拌することで処理土を得る、各材料を別々に添加、撹拌する処理方法が記載されている。 In Patent Document 2, in order to obtain a treated soil having high water content and high strength, which is easy to handle, by modifying the high water content mud, a solidifying agent such as gypsum is added to the high water content mud and stirred. Then, a polymer flocculant is added and stirred, and a water absorbing agent is further added and stirred to obtain a treated soil. A treatment method is described in which each material is separately added and stirred.
特許文献１に開示された固体化剤は、一剤型の中性固化剤であり、これを泥土に混ぜ込むだけで泥土を固体化できるが、これにより固体化された泥土は塊状のものであり、高強度の改良体が得られず、固体化後の取り扱いが困難になるという問題が指摘されていた。 The solidifying agent disclosed in Patent Document 1 is a one-part type of neutral solidifying agent, and it is possible to solidify the mud only by mixing it into the mud, but the solidified mud is a lumpy one. There has been a problem that a high strength improvement product can not be obtained and handling after solidification becomes difficult.
特許文献２に記載された処理方法によれば、泥土を、強度が高く、取り扱いが容易な造粒物に固化させることができるが、各剤を順番に泥土に投下して処理を行なう必要があるため、大型の処理装置を導入して手間がかかる処理を行なう必要があった。 According to the treatment method described in Patent Document 2, the mud can be solidified into a granulated material having high strength and easy to handle, but it is necessary to dispose each agent in order to carry out the treatment. Because of this, it has been necessary to introduce a large-scaled processing apparatus to perform time-consuming processing.
本発明は、上記現状に鑑み、処理方法を簡略化できる一剤型の固化剤でありながら、泥状の含水土に混ぜ込むだけで、短時間の処理によって、取り扱い容易で高強度の粒状物に固化させることができる中性固化剤を提供することを課題とする。 The present invention is a one-component type solidifying agent which can simplify the treatment method in view of the above-mentioned present situation, but it is easy to handle and high strength granular material by treatment in a short time only by mixing in mud-like hydrated soil. It is an object of the present invention to provide a neutral solidifying agent that can be solidified into
本発明者らは、処理方法を簡略化できる一剤型の固化剤を構成するにあたって、特許文献１に記載されているような石膏ではなく、ゼオライトを含む多孔性物質を中心に、マグネシウム化合物を含む無機鉱物と、該無機鉱物を中性にするためのｐＨ調整剤と、高分子凝集剤を一剤型にすることで薬剤の使用が容易であり、特殊な設備を用いずにバックホウや各種ミキサー系混練機を用いることで、短時間の処理でも、泥土を、取り扱い容易で高強度の粒状物に固化させることができることを見出し、本発明に至った。 In order to construct a one-part solidifying agent that can simplify the processing method, the present inventors focused on a magnesium compound mainly on a porous material containing zeolite, not gypsum as described in Patent Document 1. By using an inorganic mineral, a pH adjuster for neutralizing the inorganic mineral, and a polymer flocculant as a one-component type, it is easy to use the drug, and it is possible to use backhoes and various types without special equipment. By using a mixer type | system | group kneader, even if it is a process for a short time, it discovered that a mud could be solidified in the granular material which was easy to handle and was high strength, and came to this invention.
すなわち本発明は、多孔性物質であるゼオライト、マグネシウム化合物、ｐＨ調整剤としてアルミニウム化合物又は鉄化合物、及び高分子凝集剤を含む、一剤型の中性固化剤に関する。好ましくは、前記マグネシウム化合物が酸化マグネシウムを含む無機鉱物の混合物である。好ましくは、前記高分子凝集剤がポリカルボン酸塩系物質（アクリルアミドとの共重合物を含む）。好ましくは、前記ゼオライトの含量が４０〜９８重量％、前記マグネシウム化合物の含量が０．５〜５０重量％、前記ｐＨ調整剤の含量が０．１〜２０重量％、及び前記高分子凝集剤の含量が０．１〜１０重量％である。
に関する。
That is, the present invention relates to a one-component neutralizing agent comprising zeolite which is a porous material, a magnesium compound, an aluminum compound or an iron compound as a pH adjuster, and a polymer flocculant. Preferably, the magnesium compound is a mixture of inorganic minerals including magnesium oxide. Preferably, the polymeric flocculant comprises a polycarboxylate based material (including a copolymer with acrylamide). Preferably, the content of the zeolite is 40 to 98% by weight, the content of the magnesium compound is 0.5 to 50% by weight, the content of the pH adjuster is 0.1 to 20% by weight, and The content is 0.1 to 10% by weight.
About.
本発明の一剤型の中性固化剤は、これを泥土に混ぜ込むだけで、短時間の処理によって、取り扱いが容易な高強度の粒状土に改質することができる。 The one-component neutral solidifying agent of the present invention can be reformed into a high-strength granular soil which is easy to handle by simply mixing it into the mud and treating it for a short time.
本発明によれば、泥土の改質に要する時間が短くて済み、養生時間を設ける必要がなく、少量の添加で、現場で即時に改質することが可能である。改質後の泥土は、強度の高い粒状の土となり、取り扱いが容易で、再泥土することがなく安定性に優れている。また、本発明の中性固化剤は有害物質を含有しておらず、中性域での処理を実現することができる。さらに、本発明の中性固化剤の適用範囲は広く、一般的には改質が困難とされている高泥水の泥土や、有機物を含む汚泥さえも改質することができる。 According to the present invention, the time required for reforming the mud is short, there is no need to set a curing time, and it is possible to perform on-site reforming immediately with a small amount of addition. The post-modification mud is a high-strength granular soil, easy to handle, and excellent in stability without re-mud. In addition, the neutralization agent of the present invention does not contain harmful substances, and treatment in the neutral range can be realized. Furthermore, the scope of application of the neutralization agent of the present invention is wide, and it is possible to reform even high mud mud, which is generally considered difficult to reform, and even sludge containing organic matter.
以下、本発明の実施形態を詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail.
本発明の中性固化剤は、泥土に混ぜ込むことで、泥土を、取り扱いが容易な高強度の粒状土に改質するために使用されるものであり、一剤型の薬剤である。また、得られる粒状土は、中性付近を示し、雨水等に曝されても再泥土が抑制されている。ここで、中性付近とは、特に限定されないが、例えば、ｐＨで５．０〜９．０、好ましくは５．５〜８．６を指す。 The neutralization agent of the present invention is used to reform the mud into a high-strength granular soil that is easy to handle by being mixed with the mud, and is a single-agent type drug. Moreover, the granular soil obtained shows near neutrality, and the re-soil is suppressed even if it is exposed to rain water or the like. Here, although the vicinity of neutral is not particularly limited, it indicates, for example, pH 5.0 to 9.0, preferably 5.5 to 8.6.
本発明の中性固化剤は、必須成分として、多孔性物質であるゼオライト、マグネシウム化合物、ｐＨ調整剤としてアルミニウム化合物又は鉄化合物、及び、高分子凝集剤を含有する薬剤である。 The neutralizing agent of the present invention is a drug containing zeolite, which is a porous material, a magnesium compound, an aluminum compound or iron compound as a pH adjuster, and a polymer flocculant as essential components.
本発明の中性固化剤は、多孔性物質として、ゼオライトを含有する。ゼオイライトとは、アルミノケイ酸塩を指し、その結晶構造中に比較的大きな空隙を持つものである。ゼオライトは、本発明の中性固化剤において、泥土の水分を吸収すると共に、改質後の土の強度を高める役割を果たし、副次的に有害物質の吸着などにも寄与する。ゼオライトは、粉体状のものを用いることが好ましく、粉体の粒子径としては２ｍｍ以下が好ましい。さらに、粒子径が７５μｍ以上の粒子を１０重量％以上含む粉体が好ましい。ゼオライト以外の多孔性物質として、例えば、フライアッシュ、パーライト、珪藻土、バーミキュライト等を併用することができる。 The neutralizing agent of the present invention contains zeolite as a porous material. Zeoylite refers to an aluminosilicate and has a relatively large void in its crystal structure. Zeolite is a neutral solidification agent of the present invention, which absorbs moisture in the mud and plays a role in enhancing the strength of the soil after modification, and also contributes to adsorption of harmful substances as a secondary matter. The zeolite is preferably in the form of powder, and the particle size of the powder is preferably 2 mm or less. Furthermore, a powder containing 10% by weight or more of particles having a particle diameter of 75 μm or more is preferable. As porous materials other than zeolite, for example, fly ash, perlite, diatomaceous earth, vermiculite and the like can be used in combination.
本発明の中性固化剤は、少なくとも、マグネシウム化合物を含有する。マグネシウム化合物は、本発明の中性固化剤において、改良された土の強度を高める効果と共に、カチオンを放出して、後述する高分子凝集剤に起因する粘着性を解消し、粒状土の接着を防止して分離を促進する役割を果たす。マグネシウム化合物としては、例えば、酸化マグネシウム、炭酸マグネシウムが挙げられる。なかでも酸化マグネシウムが好ましい。酸化マグネシウムは粉体状のものを用いることが好ましく、粉体の粒子径としては１ｍｍ以下の微粉が好ましい。また、マグネシウム化合物は、酸化マグネシウムを含む無機鉱物の混合物であることが好ましく、この場合、マグネシウム化合物と共に、炭酸カルシウムや珪酸カルシウム等のカルシウム化合物や、ペーパースラッジ灰などを併用することもできる。 The neutralizing agent of the present invention contains at least a magnesium compound. The magnesium compound, together with the effect of enhancing the strength of the soil in the neutralizing agent of the present invention, releases a cation to eliminate the tackiness caused by the polymer flocculant described later, and adheres to the granular soil. It plays a role in preventing and promoting separation. Examples of the magnesium compound include magnesium oxide and magnesium carbonate. Among them, magnesium oxide is preferred. Magnesium oxide is preferably used in the form of powder, and the particle size of the powder is preferably fine powder of 1 mm or less. The magnesium compound is preferably a mixture of inorganic minerals containing magnesium oxide. In this case, a calcium compound such as calcium carbonate or calcium silicate, paper sludge ash or the like can be used in combination with the magnesium compound.
また本発明の中性固化剤は、ｐＨ調整剤として、アルミニウム化合物、又は、鉄化合物を含有する。これらｐＨ調整剤は、マグネシウム化合物やペーパースラッジ灰などが示すアルカリ性を中和する役割と、カチオンを放出して、土粒子の表面電荷を中和し、凝結作用を起こす効果と後述する高分子凝集剤に起因する粘着性を解消し、粒状土の接着を防止して分離を促進する役割を果たす。アルミニウム化合物と鉄化合物は併用してもよい。アルミニウム化合物としては、硫酸バンド（硫酸アルミニウム）、ポリ塩化アルミニウム、アルミン酸ナトリウム等が挙げられる。鉄化合物としては、例えば、ポリ塩化第二鉄、硫酸第一鉄、ポリ硫酸第二鉄、ポリシリカ鉄等が挙げられる。好ましいｐＨ調整剤は、硫酸バンド、及びポリ塩化アルミニウムである。 Moreover, the neutralization agent of this invention contains an aluminum compound or an iron compound as a pH adjuster. These pH adjusters have the role of neutralizing alkalinity such as magnesium compounds and paper sludge ash, and the effect of releasing cations to neutralize the surface charge of soil particles and causing aggregation and polymer aggregation to be described later It acts to eliminate the adhesion caused by the agent and to prevent the adhesion of granular soil to promote separation. The aluminum compound and the iron compound may be used in combination. As an aluminum compound, a sulfuric acid band (aluminum sulfate), poly aluminum chloride, sodium aluminate etc. are mentioned. Examples of the iron compound include poly (ferric chloride), ferrous sulfate, poly (ferric sulfate), polysilica iron and the like. Preferred pH adjusters are a sulfuric acid band and polyaluminum chloride.
さらに本発明の中性固化剤は、高分子凝集剤を含有する。高分子凝集剤は、泥土を凝集させて粒状にする役割を果たす。高分子凝集剤としては従来公知のものを使用することができ、例えば、アクリル酸ナトリウム等のカルボン酸塩系の重合体、カルボン酸塩とアクリルアミドとの共重合体、スルホン酸塩とアクリルアミドとの共重合体、アルキルアミノアクリレート塩とアクリルアミドとの共重合体、アルキルアミノメタクリレート塩とアクリルアミドとの共重合体等が挙げられる。このうち、ポリカルボン酸塩系物質、すなわち、カルボン酸塩の重合体、及び、カルボン酸塩とアクリルアミドとの共重合体が好ましい。 Furthermore, the neutralizing agent of the present invention contains a polymer coagulant. The polymeric flocculant serves to flocculate and granulate the mud. As the polymer flocculant, conventionally known ones can be used. For example, carboxylate polymers such as sodium acrylate, copolymers of carboxylate and acrylamide, sulfonates and acrylamide Examples thereof include copolymers, copolymers of alkylaminoacrylate salt and acrylamide, and copolymers of alkylamino methacrylate salt and acrylamide. Among these, polycarboxylate-based substances, that is, polymers of carboxylates, and copolymers of carboxylates and acrylamides are preferable.
前記カルボン酸塩とアクリルアミドとの共重合体におけるポリカルボン酸としては、例えば、アクリル酸、メタクリル酸、イタコン酸、マレイン酸、カルボキシメチルセルロース等を挙げることができる。 Examples of the polycarboxylic acid in the copolymer of carboxylic acid salt and acrylamide include acrylic acid, methacrylic acid, itaconic acid, maleic acid, carboxymethyl cellulose and the like.
前記スルホン酸塩とアクリルアミドとの共重合体におけるスルホン酸としては、例えば、アクリルアミド２−メチルプロパンスルホン酸、ビニルスルホン酸、スチレンスルホン酸等を挙げることができる。 Examples of the sulfonic acid in the copolymer of the sulfonic acid salt and acrylamide include acrylamido 2-methylpropane sulfonic acid, vinyl sulfonic acid, styrene sulfonic acid and the like.
前記アルキルアミノアクリレート塩とアクリルアミドとの共重合体におけるアルキルアミノアクリレート塩としては、アクリル酸ジメチルアミノエチル、ジメチルアミノプロピルアクリルアミド、アクリロイルオキシエチルトリメチルアンモニウムクロリド、アクリロイルアミノプロピルトリメチルアンモニウムクロリド、アクリロイル２−ヒドロキシプロピルリド等を挙げることができる。 Examples of the alkylaminoacrylate salt in the copolymer of the alkylaminoacrylate salt and acrylamide include dimethylaminoethyl acrylate, dimethylaminopropyl acrylamide, acryloyloxyethyl trimethyl ammonium chloride, acryloyl amino propyl trimethyl ammonium chloride, acryloyl 2-hydroxypropyl Lido etc. can be mentioned.
前記アルキルアミノメタクリレート塩とアクリルアミドとの共重合体におけるアルキルアミノメタクリレート塩としては、メタアクリル酸ジメチルアミノエチル、ジメチルアミノプロピルメタアクリルアミド、メタアクリロイルオキシエチルトリメチルアンモニウムクロリド、メタアクリロイルアミノプロピルトリメチルアンモニウムクロリド、メタアクリロイル２−ヒドロキシプロピルリド等を挙げることができる。 Examples of the alkylamino methacrylate salt in the copolymer of the alkyl amino methacrylate salt and acrylamide include dimethylaminoethyl methacrylate, dimethylaminopropyl methacrylamide, methacryloyl oxyethyl trimethyl ammonium chloride, methacryloyl amino propyl trimethyl ammonium chloride, and meta amino acid. Acryloyl 2-hydroxypropylide and the like can be mentioned.
高分子凝集剤の分子量は特に限定されないが、例えば、粘度法により測定した固有粘度から算出される分子量が１０００万〜２０００万の範囲にあるものであってもよい。 Although the molecular weight of the polymer flocculant is not particularly limited, for example, the molecular weight calculated from the intrinsic viscosity measured by the viscosity method may be in the range of 10,000,000 to 20,000,000.
また、高分子凝集剤は粉体状のものを使用することが好ましい。その粒径は特に限定されないが、例えば、２００メッシュのふるいを通過した粒径７５μｍ以下のものや、１００メッシュのふるいを通過した粒径１５０μｍ以下のもの、６０メッシュのふるいを通過した粒径２５０μｍ以下のものを使用することができる。より短時間で泥土の改質を実現できることから、高分子凝集剤の粒径は小さいほうが好ましい。従って、２５０μｍ以下が好ましく、１５０μｍ以下がより好ましく、７５μｍ以下がさらに好ましい。 In addition, it is preferable to use a powdery polymer coagulant. Although the particle size is not particularly limited, for example, those having a particle diameter of 75 μm or less passing through a 200 mesh sieve, those having a particle diameter of 150 μm or less passing through a 100 mesh sieve, or 250 μm particle diameter passing through a 60 mesh sieve The following can be used: It is preferable that the particle size of the polymer flocculant be smaller, since the modification of the mud can be realized in a shorter time. Therefore, 250 micrometers or less are preferable, 150 micrometers or less are more preferable, and 75 micrometers or less are more preferable.
本発明の中性固化剤は、上述した四成分を必須成分とし、他の成分を含有してもよいし、含有しなくともよいが、従来の土壌改良剤に使用されている、セメント、石膏、生石灰のいずれも含有することなく、泥土を粒状土に改質することができる。 The neutralization agent according to the present invention contains the above four components as an essential component, and may or may not contain other components, but is used in conventional soil conditioners, cement, gypsum Mud can be reformed to granular soil without containing any of quick lime.
本発明の中性固化剤における各成分の含有量は、泥土の改質の度合いを考慮して適宜設定可能であるが、具体的には、中性固化剤全体を１００重量％として、前記ゼオライトの含量が４０〜９８重量％、前記マグネシウム化合物の含量が０．５〜５０重量％、前記ｐＨ調整剤の含量が０．１〜２０重量％、及び高分子凝集剤の含量が０．１〜１０重量％であることが好ましい。前記ゼオライトの含量は５０〜９８重量％がより好ましく、６０〜９７重量％がさらに好ましく、７０〜９６重量％がよりさらに好ましく、８０〜９５重量％が特に好ましい。前記マグネシウム化合物の含量は０．８〜４０重量％がより好ましく、１．０〜３０重量％がさらに好ましく、１．０〜２０重量％がよりさらに好ましい。前記ｐＨ調整剤の含量は０．１〜２０重量％がより好ましく、０．５〜１５重量％がさらに好ましく、１．０〜１０重量％がよりさらに好ましい。高分子凝集剤の含量は０．５〜１０重量％がより好ましく、０．８〜８重量％がさらに好ましく、１．０〜５重量％がよりさらに好ましい。 The content of each component in the neutralization agent of the present invention can be appropriately set in consideration of the degree of modification of the mud, but specifically, the above-mentioned zeolite is made 100% by weight of the whole neutralization agent. Content of 40 to 98 wt%, the content of the magnesium compound 0.5 to 50 wt%, the content of the pH adjuster 0.1 to 20 wt%, and the content of the polymer flocculant 0.1 to It is preferably 10% by weight. The content of the zeolite is more preferably 50 to 98% by weight, still more preferably 60 to 97% by weight, still more preferably 70 to 96% by weight, and particularly preferably 80 to 95% by weight. The content of the magnesium compound is more preferably 0.8 to 40% by weight, further preferably 1.0 to 30% by weight, and still more preferably 1.0 to 20% by weight. The content of the pH adjuster is more preferably 0.1 to 20% by weight, still more preferably 0.5 to 15% by weight, and still more preferably 1.0 to 10% by weight. The content of the polymer flocculant is more preferably 0.5 to 10% by weight, further preferably 0.8 to 8% by weight, and still more preferably 1.0 to 5% by weight.
本発明の中性固化剤は、各成分を混合して製造することができる。各成分はそれぞれ個別の材料であってよいが、そのうち２成分があらかじめ混合されたものを使用してもよい。特に前記マグネシウム化合物と前記ｐＨ調整剤は、これらがあらかじめ混合されて市販されている、中性化された酸化マグネシウムを使用することができる。各成分を混合するにあたっては、特に限定されないが、リボン式、パドル式、回転ドラム式等の任意の方式の混合機器を使用すればよい。 The neutralization agent of the present invention can be produced by mixing the respective components. Each component may be an individual material, but two components may be used in advance. In particular, it is possible to use neutralized magnesium oxide in which the magnesium compound and the pH adjusting agent are mixed in advance and commercially available. In mixing the respective components, although not particularly limited, mixing devices of any type such as ribbon type, paddle type, rotating drum type and the like may be used.
本発明の中性固化剤は、対象となる泥土に混ぜ合わさることで泥土を固化するために使用される。泥土に混ぜ合わせる方法は特に限定されないが、特殊な装置を用いる必要はなく、例えば、排泥が発生した現場において、バックホウや各種ミキサー系混練機などの重機を用いて泥土と中性固化剤を混合するだけで、泥土を、高い強度を備え、取り扱いが容易な粒状土に改質することができる。 The neutralizing agent of the present invention is used to solidify the mud by mixing with the target mud. The method of mixing in the mud is not particularly limited, but it is not necessary to use a special device, for example, in the site where the sludge is generated, the mud and the neutralizing agent are used using heavy equipment such as backhoe or various mixer-based kneaders. By simply mixing, the mud can be reformed into granular soil with high strength and easy to handle.
本発明の中性固化剤の使用量は、泥土の含水量や、有機物の含量などにより左右され、特に限定されないが、改質の程度を考慮して当業者は適宜設定可能である。しかし、例えば、含水土１００重量部に対して０．１〜１０重量部程度、好ましくは１〜５重量部程度使用すればよい。本発明の中性固化剤には、セメント系固化材や石膏系固化材と比較して少量の使用であっても泥土の改質が可能という利点がある。 The amount of use of the neutralizing agent of the present invention depends on the water content of the mud, the content of the organic matter, etc., and is not particularly limited, but can be appropriately set by those skilled in the art in consideration of the degree of modification. However, for example, about 0.1 to 10 parts by weight, preferably about 1 to 5 parts by weight, may be used with respect to 100 parts by weight of hydrous soil. The neutralization agent of the present invention has the advantage that it can be used to modify the mud even with a small amount of use compared to cement-based and gypsum-based solidification agents.
本発明によって改質できる泥土としては、特に限定されないが、泥状の掘削物や泥水からなる泥土であってよく、改良を必要とする泥状土が対象となる。より具体的には、シールド工事や推進工事などから発生する泥状土、浚渫工事などから発生する含水比８０重量％以上の高含水の軟弱土等が挙げられる。本発明によると、このような泥土を、中性で、コーン指数が２００ｋＮ／ｍ２以上と強度が改善されて、再泥化が防止され、しかも、取り扱いが容易な粒状土に改質することができる。 The mud which can be reformed according to the present invention is not particularly limited, but it may be a mud consisting of excavated material and mud, and intended as mud which needs improvement. More specifically, mud soil generated from shield work, promotion work, etc., high moisture soft soil with a water content ratio of 80% by weight or more generated from dredging work, etc. may be mentioned. According to the present invention, such mud is modified to a neutral, granular index having a corn index of 200 kN / m 2 or more, which is improved in the regrind and easy to handle. Can.
以下に実施例を掲げて本発明をさらに詳細に説明するが、本発明はこれら実施例に限定されるものではない。 The present invention will be described in more detail by way of examples given below, but the present invention is not limited to these examples.
（試験例）
［試験目的］
高分子凝集剤について、粒度による改質時間の差を確認することで改質に最適な粒度を確認することを目的とする。
(Test example)
[Test purpose]
The purpose of the polymer flocculant is to confirm the particle size optimum for reforming by confirming the difference in the modification time depending on the particle size.
［試験方法］
試験対象土：水田採取粘土（京都市）
高分子凝集剤：アクリル酸塩−アクリルアミド共重合体の粉体品。粒度を７５μｍ（２００メッシュ）、１５０μｍ（１００メッシュ）、又は２５０μｍ（６０メッシュ）に調節したもの。
試験機材：ホバートミキサー、ストップウォッチ
[Test method]
Test target soil: paddy collected clay (Kyoto City)
Polymeric flocculant: powder of acrylic acid salt-acrylamide copolymer. Particle size adjusted to 75 μm (200 mesh), 150 μm (100 mesh), or 250 μm (60 mesh).
Test equipment: Hobart mixer, stop watch
試験手順：
（１）試験対象土に加水を行い、電子レンジ法（ＪＩＳ１２０３：２００９／ＪＧＳ０１２１−２００９）にて含水比を測定した。
（２）１Ｌすり切りビーカーにて、ボウルに加水対象土を１Ｌ量り取った。
（３）加水対象土に試験高分子凝集剤を１ｋｇ／ｍ３（１ｇ／Ｌ）添加して、ホバートミキサーを用いて混合し、加水対象土が造粒するまでの時間（改質時間）をストップウォッチにて測定した。得られた結果を表１に示す。
Test procedure:
(1) Water was added to the test target soil, and the water content ratio was measured by the microwave method (JIS 1203: 2009 / JGS 0121-2009).
(2) In a 1 L scraping beaker, 1 L of the soil to be hydrolyzed was weighed into a bowl.
(3) Add 1 kg / m 3 (1 g / L) of the test polymer flocculant to the soil to be hydrolyzed, mix using a Hobart mixer, and set the time (reforming time) until the soil to be hydrated is granulated Measured with a stopwatch. The obtained results are shown in Table 1.
［試験結果］
表１より、高分子凝集剤の粒度や、対象土の含水比に関わらず、いずれの試験においても、対象土を造粒化することができた。しかし、最も粒度の細かい粒度７５μｍの粉体品が、最も短時間で対象土を造粒化することができた。この結果に基づき、以下の実施例では、高分子凝集剤として、粒度が７５μｍのものを使用した。
[Test results]
From Table 1, the target soil was able to be granulated in any test regardless of the particle size of the polymer flocculant and the water content ratio of the target soil. However, the powder product of the finest particle size 75 μm was able to granulate the target soil in the shortest time. Based on this result, in the following examples, a polymer flocculant having a particle size of 75 μm was used.
（実施例及び比較例）
［試験方法］
試験対象土：
（１）水田採取粘土（京都市）と市販川砂を混合したもの。
含水比４０．２％、ｐＨ５．６６、湿潤密度１．７８。
礫分２．５％、砂分７４．０％、シルト分２０．０％、粘土分３．５％（細粒分２３．５％）。
(Example and Comparative Example)
[Test method]
Test target soil:
(1) A mixture of paddy field collected clay (Kyoto City) and commercial river sand.
Water content ratio 40.2%, pH 5.66, wet density 1.78.
Fraction 2.5%, sand 74.0%, silt 20.0%, clay 3.5% (fines 23.5%).
（２）水田採取粘土（京都市）：砂質粘性土：ＣｓＳ。
含水比６０．３％、ｐＨ５．６３、湿潤密度１．５６、土粒子の密度２．４９６ｇ／ｃｍ３（有機物を多く含む）。
礫分２．９％、砂分３５．０％、シルト分５７．７％、粘土分４．４％（細粒分６２．１％）。
(2) Paddy field collection clay (Kyoto City): sandy clay soil: CsS.
Water content ratio 60.3%, pH 5.63, wet density 1.56, density of soil particles 2.496 g / cm 3 (containing a large amount of organic matter).
2.9% share, 35.0% sand, 57.7% silt, 4.4% clay (62.1% fines).
（３）前記（２）に加水して、含水比７６．９％としたもの。 (3) A water content ratio of 76.9% by adding water to the above (2).
ゼオライト：天然ゼオライト
中性化酸化マグネシウム：（内訳）炭酸カルシウム３０〜３５％、酸化マグネシウム２５〜３０％、非晶質系珪酸カルシウム２０〜３０％、硫酸バンド１５〜２５％。
高分子凝集剤：アクリル酸塩−アクリルアミド共重合体の粉体品。粒度を７５μｍ以下（２００メッシュ）に調節したもの。
Zeolite: Natural zeolite Neutralized magnesium oxide: (Breakdown) 30 to 35% of calcium carbonate, 25 to 30% of magnesium oxide, 20 to 30% of amorphous calcium silicate, and 15 to 25% of sulfuric acid band.
Polymeric flocculant: powder of acrylic acid salt-acrylamide copolymer. Adjusted particle size to 75 μm or less (200 mesh).
試験手順：
（１）試験対象土を１．５Ｌ秤量した。
（２）秤量した土砂に対して、各表に示す土質改良材を、各表に示す添加量で添加した後、１分間の混合撹拌（機械）を行った。なお、添加量は、試験対象土の体積当たりの重量とした。
（３）混合撹拌後の土砂性状を確認し、コーン指数及びｐＨ（混合撹拌直後、養生１日後、３日後及び７日後）を測定した。養生は、モールドに詰めてそのまま室温にて行った。
Test procedure:
(1) The test target soil was weighed by 1.5 liters.
(2) After adding the soil improvement agent shown to each table | surface to the weighed soil with the addition amount shown to each table | surface, mixing stirring (machine) for 1 minute was performed. The addition amount was the weight per volume of the soil to be tested.
(3) Soil properties after mixing and stirring were confirmed, and corn index and pH (immediately after mixing and stirring, one day after curing, three days and seven days after curing) were measured. Curing was carried out at room temperature as it was packed in a mold.
表２に示した実施例と比較例では、試験対象土として（１）を使用した結果をまとめた。表２中の実施例１〜３では、本発明の実施形態に係る中性固化剤として、ゼオライト９４重量％、中性化酸化マグネシウム５重量％（すなわち、酸化マグネシウム約１．３〜１．５重量％、硫酸バンド約０．８〜１．３重量％）、高分子凝集剤１重量％を配合したものを使用した。 In the Example and comparative example which were shown in Table 2, the result of having used (1) as test object soil was put together. In Examples 1 to 3 in Table 2, 94% by weight of zeolite and 5% by weight of neutralized magnesium oxide (that is, about 1.3 to 1.5 of magnesium oxide) as a neutralizing agent according to an embodiment of the present invention A mixture of 1% by weight of a polymer flocculant was used.
比較例１〜３では、石膏と高分子凝集剤とからなる改良剤を試験対象土に混ぜ込んだ結果、試験対象土はある程度改質されたが、粒状土にはならず、容器の壁面にも貼りつき、取り扱いが困難なものであった。また、改質された土の強度は、試験対象土と比較とすると向上したものの、その向上の度合いは十分なものではなかった。 In Comparative Examples 1 to 3, as a result of mixing the modifier comprising gypsum and the polymer coagulant into the test target soil, the test target soil was reformed to some extent, but it did not become granular soil, and It was also stuck and difficult to handle. Moreover, although the strength of the modified soil was improved in comparison with the soil to be tested, the degree of improvement was not sufficient.
これに対し、本発明の中性固化剤を試験対象土に混ぜ込んだ実施例１〜３では、試験対象土が粒状の土に改質され、容器の壁面にも貼りつかず、取り扱いが極めて容易なものとなった。改質された土は、１分間の混合撹拌直後でコーン指数が２００ｋＮ／ｍ２を超えることとなり、高い強度を示すものとなった。 On the other hand, in Examples 1 to 3 in which the neutral solidifying agent of the present invention is mixed into the soil to be tested, the soil to be tested is reformed into granular soil and does not stick to the wall of the container. It became easy. The modified soil had a corn index exceeding 200 kN / m 2 immediately after mixing and stirring for 1 minute, and showed high strength.
表３に示した実施例と比較例では、試験対象土として（２）を使用した結果をまとめた。表３中の実施例４〜６では、本発明の実施形態に係る中性固化剤として、ゼオライト４５重量％、中性化酸化マグネシウム４５重量％（すなわち、酸化マグネシウム約１１〜１４重量％、硫酸バンド約６．８〜１１重量％）、高分子凝集剤１０重量％を配合したものを使用した。 In the Example and comparative example which were shown in Table 3, the result of having used (2) as test object soil was put together. In Examples 4 to 6 in Table 3, 45% by weight of zeolite, 45% by weight of neutralized magnesium oxide (that is, about 11 to 14% by weight of magnesium oxide, sulfuric acid) as a neutralizing agent according to an embodiment of the present invention A band of about 6.8 to 11% by weight) and 10% by weight of a polymer flocculant were used.
石膏を用いた比較例４〜６では、いずれも高いコーン指数は達成されず、また、粒状土を得ることもできなかった。生石灰を３％用いた比較例７では、高いコーン指数は達成されず、また、粒状土を得ることもできなかった。生石灰を５％用いた比較例８ではある程度のコーン指数は達成できたが、粒状土を得ることはできなかった。生石灰を１０％用いた比較例９では、高いコーン指数は達成できたが、粒状土を得ることができず、また、処理後の土がアルカリ性を示し、好ましいものではなかった。 In Comparative Examples 4 to 6 using gypsum, none of the high corn index was achieved, and no granular soil could be obtained. In Comparative Example 7 in which 3% of quick lime was used, a high corn index was not achieved, and no granular soil could be obtained. In Comparative Example 8 in which 5% of quick lime was used, although a certain degree of corn index could be achieved, granular soil could not be obtained. In Comparative Example 9 in which 10% of quick lime was used, a high corn index could be achieved, but granular soil could not be obtained, and the soil after treatment was not preferable because it showed alkalinity.
本発明の中性固化剤を試験対象土に混ぜ込んだ実施例４〜６では、試験対象土が粒状の土に改質され、容器の壁面に貼りつくこともなく、取り扱いが極めて容易な粒状土を得ることができた。改質された土は、１分間の混合撹拌直後でコーン指数が２００ｋＮ／ｍ２を超えることとなり、高い強度を示すものとなった。 In Examples 4 to 6 in which the neutralizing agent of the present invention is mixed with the soil to be tested, the soil to be tested is reformed into granular soil, and the granular material is extremely easy to handle without sticking to the wall of the container. I was able to get the soil. The modified soil had a corn index exceeding 200 kN / m 2 immediately after mixing and stirring for 1 minute, and showed high strength.
石膏と高分子凝集剤とからなる改良剤を３％用いた比較例１０では、比較的高いコーン指数が達成され、また、粒状土を得ることもできたが、改良剤の添加量が同じ実施例６と比較すると明らかに効果が劣るものであった。 In Comparative Example 10 using 3% of a modifier composed of gypsum and a polymer flocculant, a relatively high corn index was achieved, and granular soil could be obtained, but the implementation of the same amount of modifier was the same. The effect was obviously inferior to that of Example 6.
表４に示した実施例と比較例では、試験対象土として（３）を使用した結果をまとめた。表４中の実施例７〜９では、本発明の実施形態に係る中性固化剤として、ゼオライト４５重量％、中性化酸化マグネシウム４５重量％（すなわち、酸化マグネシウム約１１〜１４重量％、硫酸バンド約６．８〜１１重量％）、高分子凝集剤１０重量％を配合したものを使用した。 In the Example and comparative example which were shown in Table 4, the result of having used (3) as test object soil was put together. In Examples 7 to 9 in Table 4, 45% by weight of zeolite, 45% by weight of neutralized magnesium oxide (that is, about 11 to 14% by weight of magnesium oxide, sulfuric acid) as a neutralizing agent according to an embodiment of the present invention A band of about 6.8 to 11% by weight) and 10% by weight of a polymer flocculant were used.
石膏を用いた比較例１１〜１３では、いずれも高いコーン指数は達成されず、また、粒状土を得ることもできなかった。生石灰を用いた比較例１４〜１６でも、いずれも高いコーン指数は達成されず、また、粒状土を得ることもできなかった。加えて、生石灰を１０％用いた比較例１６では、処理後の土がアルカリ性を示し、好ましいものではなかった。 In each of Comparative Examples 11 to 13 using gypsum, no high corn index was achieved, and no granular soil could be obtained. In each of Comparative Examples 14 to 16 using quick lime, no high corn index was achieved, and no granular soil could be obtained. In addition, in Comparative Example 16 in which 10% of quick lime was used, the soil after treatment showed alkalinity and was not preferable.
本発明の中性固化剤を試験対象土に混ぜ込んだ実施例７〜９のうち、中性固化剤の使用量がわずか１％と少ない実施例７では、改質土の強度が比較的低かったものの、使用量が２％又は３％の実施例８及び９では、試験対象土が粒状の土に改質され、容器の壁面に貼りつくこともなく、取り扱いが極めて容易な粒状土を得ることができた。改質された土は、１分間の混合撹拌直後でコーン指数が２００ｋＮ／ｍ２を超えることとなり、高い強度を示すものとなった。 In Examples 7 to 9 in which the neutralizing agent of the present invention is mixed with the soil to be tested, the strength of the modified soil is relatively low in Example 7 in which the amount of the neutralizing agent used is as small as 1%. However, in Examples 8 and 9 in which the amount used is 2% or 3%, the soil to be tested is reformed into granular soil, and granular soil is obtained which is extremely easy to handle without sticking to the wall of the container. I was able to. The modified soil had a corn index exceeding 200 kN / m 2 immediately after mixing and stirring for 1 minute, and showed high strength.
石膏と高分子凝集剤とからなる改良剤を１．５％又は３％用いた比較例１７及び１８では、粒状土を得ることができず、改質剤の添加量が同程度の実施例８及び９と比較して、明らかに効果が劣るものであった。
In Comparative Examples 17 and 18 in which 1.5% or 3% of an improving agent composed of gypsum and a polymer coagulant was used, granular soil could not be obtained, and Example 8 in which the amount of the modifying agent added was the same Compared with and 9, the effect was inferior.
Claims (4)
マグネシウム化合物、
ｐＨ調整剤としてアルミニウム化合物又は鉄化合物、及び
高分子凝集剤を含む、一剤型の中性固化剤。 Zeolite which is a porous material
Magnesium compounds,
A one-part neutral solidifying agent comprising an aluminum compound or an iron compound as a pH adjuster, and a polymer flocculant.
The content of the zeolite is 40 to 98 wt%, the content of the magnesium compound is 0.5 to 50 wt%, the content of the pH adjuster is 0.1 to 20 wt%, and the content of the polymer flocculant is 0 The neutralizing agent according to any one of claims 1 to 3, wherein the amount is 1 to 10% by weight.
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| JP2022039897A (en) * | 2020-08-27 | 2022-03-10 | テクニカ合同株式会社 | Method of manufacturing recycled material using unused ready-mixed concrete |
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| CN111675453B (en) * | 2020-04-30 | 2022-06-24 | 兴源环境科技股份有限公司 | Lake sediment curing agent |
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