JP7424158B2 - Soil surface solidification method - Google Patents
Soil surface solidification method Download PDFInfo
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- JP7424158B2 JP7424158B2 JP2020055627A JP2020055627A JP7424158B2 JP 7424158 B2 JP7424158 B2 JP 7424158B2 JP 2020055627 A JP2020055627 A JP 2020055627A JP 2020055627 A JP2020055627 A JP 2020055627A JP 7424158 B2 JP7424158 B2 JP 7424158B2
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- 239000002689 soil Substances 0.000 title claims description 67
- 238000000034 method Methods 0.000 title claims description 22
- 238000007711 solidification Methods 0.000 title claims description 17
- 230000008023 solidification Effects 0.000 title claims description 17
- 229920001732 Lignosulfonate Polymers 0.000 claims description 45
- 239000000463 material Substances 0.000 claims description 28
- 125000002091 cationic group Chemical group 0.000 claims description 25
- 238000005507 spraying Methods 0.000 claims description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 15
- 229910052749 magnesium Inorganic materials 0.000 claims description 15
- 239000011777 magnesium Substances 0.000 claims description 15
- 229920000371 poly(diallyldimethylammonium chloride) polymer Polymers 0.000 claims description 9
- 229920000642 polymer Polymers 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 7
- 125000005397 methacrylic acid ester group Chemical group 0.000 claims description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 claims description 3
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 claims description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 2
- 239000001110 calcium chloride Substances 0.000 claims description 2
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 2
- 239000011780 sodium chloride Substances 0.000 claims description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 2
- 235000011152 sodium sulphate Nutrition 0.000 claims description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims 1
- 229920005551 calcium lignosulfonate Polymers 0.000 claims 1
- 238000004381 surface treatment Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000428 dust Substances 0.000 description 5
- 239000012895 dilution Substances 0.000 description 4
- 238000010790 dilution Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000001879 gelation Methods 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 150000002013 dioxins Chemical class 0.000 description 1
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000000113 methacrylic resin Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000005518 polymer electrolyte Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- ODLMAHJVESYWTB-UHFFFAOYSA-N propylbenzene Chemical group CCCC1=CC=CC=C1 ODLMAHJVESYWTB-UHFFFAOYSA-N 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 125000001174 sulfone group Chemical group 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
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- Processing Of Solid Wastes (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
本発明は、土壌表面の固化方法に関する。 The present invention relates to a method for solidifying soil surfaces.
乾燥している土壌や有害物質を含む汚染土壌を掘削する際、土壌表面を固化させたり湿潤状態にすることにより、粉塵の飛散を防止することが行われている。 When excavating dry soil or contaminated soil containing harmful substances, the scattering of dust is prevented by solidifying or moistening the soil surface.
たとえば、従来から、リグニンスルホン酸塩を含む溶液を土壌表面に散布することにより、土壌表面を固化させ、粉塵の飛散を防止する手法が用いられている。或いは、特許文献１には、吸着剤を混合した水を汚染土壌に散布し、汚染土壌を湿潤状態にすることで、粉塵の飛散を防止する技術が開示されている。 For example, conventional methods have been used to solidify the soil surface and prevent dust from scattering by spraying a solution containing lignin sulfonate on the soil surface. Alternatively, Patent Document 1 discloses a technique for preventing dust from scattering by spraying water mixed with an adsorbent onto contaminated soil to keep the contaminated soil in a moist state.
ところで、リグニンスルホン酸塩は水に溶けやすい。よって、散布したリグニンスルホン酸塩が土壌表面を固化させる前に土壌が含む水の中に溶け出してしまうことがある。また、リグニンスルホン酸塩の溶液を散布する際、コスト面を考慮しつつ、散布に適した粘度となるまで濃度を下げた場合、土壌表面を固化する性能が低下する恐れがあるという問題があった。 By the way, lignin sulfonate is easily soluble in water. Therefore, the sprayed lignin sulfonate may dissolve into the water contained in the soil before solidifying the soil surface. In addition, when spraying a lignin sulfonate solution, if the concentration is lowered to a viscosity suitable for spraying while taking cost into account, there is a problem that the ability to solidify the soil surface may deteriorate. Ta.
本発明は、土壌表面の固化をより確実に行うことが可能な方法を提供することを目的とする。 An object of the present invention is to provide a method that can solidify the soil surface more reliably.
本発明の一実施態様は、土壌表面に対してリグニンスルホン酸塩を含む溶液を散布する第１の処理と、前記土壌表面に対してカチオン系の材料を含む溶液を散布する第２の処理と、を含む土壌表面の固化方法である。
また、土壌表面の固化方法は、前記第１の処理を行った後、前記第２の処理を行うことができる。
また、前記リグニンスルホン酸塩は、リグニンスルホン酸マグネシウム、リグニンスルホン酸ナトリウム、及びリグニンスルホン酸カルシウムからなる群から選択される少なくとも一種類以上である。
また、前記カチオン系の材料は、ポリ塩化アルミニウム、ポリジアリルジメチルアンモニウムクロリド、及びメタクリル酸エステルのポリマーからなる群から選択される少なくとも一種類以上である。
One embodiment of the present invention includes a first treatment of spraying a solution containing a lignin sulfonate on the soil surface, and a second treatment of spraying a solution containing a cationic material on the soil surface. This is a soil surface solidification method including:
In addition, in the soil surface solidification method, after performing the first treatment, the second treatment can be performed.
Further, the ligninsulfonate is at least one type selected from the group consisting of magnesium ligninsulfonate, sodium ligninsulfonate, and calcium ligninsulfonate.
The cationic material is at least one selected from the group consisting of polyaluminum chloride, polydiallyldimethylammonium chloride, and methacrylic acid ester polymers.
本発明の方法によれば、土壌表面の固化をより確実に行うことができる。 According to the method of the present invention, the soil surface can be solidified more reliably.
以下、本発明の実施の形態を、実施例を挙げながら詳細に説明する。なお、本発明の目的、特徴、利点、及びそのアイデアは、本明細書の記載により、当業者には明らかであり、本明細書の記載から、当業者であれば、容易に本発明を再現できる。以下に記載された発明の実施の形態及び具体的な実施例などは、本発明の好ましい実施態様を示すものであり、例示又は説明のために示されているのであって、本発明をそれらに限定するものではない。本明細書で開示されている本発明の意図ならびに範囲内で、本明細書の記載に基づき、様々に修飾ができることは、当業者にとって明らかである。 Hereinafter, embodiments of the present invention will be described in detail by giving examples. Note that the objects, features, advantages, and ideas of the present invention will be apparent to those skilled in the art from the description of this specification, and those skilled in the art will be able to easily reproduce the present invention from the description of this specification. can. The embodiments and specific examples of the invention described below indicate preferred embodiments of the invention and are provided for illustration or explanation, and the invention is not limited thereto. It is not limited. It will be apparent to those skilled in the art that various modifications can be made based on the description herein within the spirit and scope of the present invention disclosed herein.
＝＝土壌＝＝
本実施形態に係る固化方法が実施される土壌は、乾燥している土壌や有害物質を含む汚染土壌である。有害物質は、たとえば土壌汚染対策法に規定されている第１種特定有害物質（すなわち、揮発性有機化合物）や第２種特定有害物質（すなわち、重金属）、或いはダイオキシン類である。
==Soil==
The soil on which the solidification method according to the present embodiment is performed is dry soil or contaminated soil containing harmful substances. The harmful substances are, for example, Class 1 specified harmful substances (namely, volatile organic compounds), Class 2 specified hazardous substances (namely, heavy metals), or dioxins specified in the Soil Contamination Countermeasures Act.
本実施形態に係る固化方法は、掘削等の作業により粉塵が飛散しやすい状態にある土壌表面に対して行われることが好ましい。 The solidification method according to the present embodiment is preferably performed on soil surfaces where dust is likely to be scattered due to operations such as excavation.
＝＝リグニンスルホン酸塩＝＝
リグニンスルホン酸塩は、土壌表面を固化させる材料として用いられる。
==Lignin sulfonate==
Lignosulfonate is used as a material to solidify the soil surface.
リグニンスルホン酸塩は、リグニンの基本構造であるフェニルプロパン構造の側鎖α位を開裂させ、スルホン基を導入したものである。リグニンスルホン酸塩は、分子量数百から数百万の高分子である。また、リグニンスルホン酸塩は、水中で乖離する高分子電解質である。リグニンスルホン酸塩は、たとえば、リグニンスルホン酸マグネシウム、リグニンスルホン酸ナトリウム、及びリグニンスルホン酸カルシウムからなる群から選択される少なくとも一種以上である。 Lignin sulfonate is obtained by cleaving the α-position of the side chain of the phenylpropane structure, which is the basic structure of lignin, and introducing a sulfone group. Lignosulfonate is a polymer with a molecular weight of several hundred to several million. Furthermore, lignin sulfonate is a polymer electrolyte that dissociates in water. The ligninsulfonate is, for example, at least one selected from the group consisting of magnesium ligninsulfonate, sodium ligninsulfonate, and calcium ligninsulfonate.
本実施形態に係る固化方法においては、リグニンスルホン酸塩を水で希釈した溶液を用いる。希釈倍率は、土壌表面を固化させることができれば特に限定されるものではない。なお、リグニンスルホン酸塩のコスト面、及び土壌表面を固化する性能を考慮すると、希釈倍率は１６倍～３２倍であることが好ましい。 In the solidification method according to this embodiment, a solution of lignin sulfonate diluted with water is used. The dilution ratio is not particularly limited as long as it can solidify the soil surface. Note that, considering the cost of the lignin sulfonate and its ability to solidify the soil surface, the dilution ratio is preferably 16 to 32 times.
＝＝カチオン系の材料＝＝
カチオン系の材料は、リグニンスルホン酸塩が土壌表面を固化する性能を保つために用いられる。具体的には、リグニンスルホン酸塩がカチオン系の材料と反応してゲル化することにより、リグニンスルホン酸塩が土壌中に流出することを抑制し、土壌表面を確実に固化することができる。
==Cationic material==
Cationic materials are used to maintain the ability of lignin sulfonate to solidify the soil surface. Specifically, the lignin sulfonate reacts with a cationic material to form a gel, thereby suppressing the lignin sulfonate from flowing into the soil and reliably solidifying the soil surface.
カチオン系の材料は、たとえば、ポリ塩化アルミニウム、ポリジアリルジメチルアンモニウムクロリド、メタクリル酸エステル（メタクリル酸メチル、メタクリル酸エチル等）のポリマー（すなわちアクリル樹脂）、塩化カルシウム、塩化ナトリウム、硫酸ナトリウム、及び硫酸アルミニウムからなる群から選択される少なくとも１種である。特に、短時間でのゲル化を行うためには、カチオン系の材料は、ポリ塩化アルミニウム、ポリジアリルジメチルアンモニウムクロリド、及びメタクリル酸エステルのポリマーからなる群から選択される少なくとも一種類以上であることが好ましい。 Examples of cationic materials include polyaluminum chloride, polydiallyldimethylammonium chloride, polymers of methacrylic acid esters (methyl methacrylate, ethyl methacrylate, etc.) (i.e., acrylic resins), calcium chloride, sodium chloride, sodium sulfate, and sulfuric acid. At least one member selected from the group consisting of aluminum. In particular, in order to achieve gelation in a short time, the cationic material should be at least one type selected from the group consisting of polyaluminum chloride, polydiallyldimethylammonium chloride, and methacrylic acid ester polymers. is preferred.
本実施形態に係る固化方法においては、カチオン系の材料を水で希釈した溶液を用いる。溶液の濃度は、リグニンスルホン酸塩をゲル化することができれば特に限定されるものではないが、少なくとも１重量％であることが好ましい。一方、リグニンスルホン酸塩の添加量に対してカチオン系の材料の添加量が多すぎる場合、ゲル化が妨げられる可能性がありうる。よって、溶液の濃度は、最大で１０重量％程度とすることが好ましい。 In the solidification method according to this embodiment, a solution of a cationic material diluted with water is used. The concentration of the solution is not particularly limited as long as it can gel the lignin sulfonate, but it is preferably at least 1% by weight. On the other hand, if the amount of the cationic material added is too large relative to the amount of lignin sulfonate added, gelation may be hindered. Therefore, the concentration of the solution is preferably about 10% by weight at most.
＝＝土壌表面の固化方法＝＝
本実施形態に係る固化方法は、第１の処理及び第２の処理を含む。第１の処理は、土壌表面に対してリグニンスルホン酸塩を含む溶液を散布する。第２の処理は、土壌表面に対してカチオン系の材料を含む溶液を散布する。
== Soil surface solidification method ==
The solidification method according to this embodiment includes a first process and a second process. The first treatment involves spraying a solution containing lignin sulfonate onto the soil surface. In the second treatment, a solution containing a cationic material is sprayed onto the soil surface.
第１の処理及び第２の処理を行う順番は特に限定されない。但し、土壌表面の固化をより確実に行うためには、第１の処理を行った後、第２の処理を行うことが好ましい。 The order in which the first process and second process are performed is not particularly limited. However, in order to solidify the soil surface more reliably, it is preferable to perform the second treatment after the first treatment.
各溶液の散布は、散布する土壌の広さや土壌表面の状態等に応じて様々な方法で行うことができる。たとえば、バックホー等の重機に、各溶液を入れたタンク及び噴霧器を設置する。そして、溶液を散布する土壌近辺まで重機を移動させた後、噴霧器からタンク内の溶液を土壌表面に散布することができる。噴霧器の構成やタンクの容量等は、散布する土壌の広さや溶液の状態（たとえば溶液の粘度）に応じて適当なものを用いることができる。また、各溶液の散布量も土壌表面の状態等に応じて適宜設定することができる。 Spraying of each solution can be performed in various ways depending on the area of the soil to be sprayed, the condition of the soil surface, etc. For example, a tank containing each solution and a sprayer are installed on heavy equipment such as a backhoe. After moving the heavy equipment to the vicinity of the soil where the solution is to be sprayed, the solution in the tank can be sprayed onto the soil surface from the sprayer. The structure of the sprayer, the capacity of the tank, etc. can be appropriately selected according to the area of the soil to be sprayed and the state of the solution (for example, the viscosity of the solution). Furthermore, the amount of each solution to be sprayed can be appropriately set depending on the condition of the soil surface and the like.
本実施形態に係る固化方法によれば、散布したリグニンスルホン酸塩がカチオン系の材料によりゲル化する。よって、リグニンスルホン酸塩が土壌表面を固化させる前に土壌が含む水の中に溶け出す可能性が低いため、土壌表面の固化をより確実に行うことができる。その結果、土壌の掘削に伴う粉塵の飛散を防止することができる。 According to the solidification method according to the present embodiment, the dispersed lignin sulfonate is gelled by the cationic material. Therefore, since there is a low possibility that the lignin sulfonate will dissolve into the water contained in the soil before solidifying the soil surface, the soil surface can be solidified more reliably. As a result, scattering of dust due to soil excavation can be prevented.
＝＝実施例＝＝
［土壌を固化する性能について］
リグニンスルホン酸塩の土壌を固化する性能について実験を行った。
==Example==
[About soil solidification performance]
An experiment was conducted on the ability of lignin sulfonate to solidify soil.
（土壌）
土壌は、珪砂７号（瑞浪産）約４０００ｇを容器に敷き詰めたものを用いた。容器のサイズは、３１２ｍｍ×２３７ｍｍ×ｄ４９ｍｍ（表面積は０．０７４ｍ２）である。
(soil)
The soil used was a container filled with approximately 4000 g of silica sand No. 7 (produced by Mizunami). The size of the container is 312 mm x 237 mm x d49 mm (surface area is 0.074 m 2 ).
（リグニンスルホン酸塩）
リグニンスルホン酸塩は、リグニンスルホン酸マグネシウム（Ｐ３２１粉体 日本製紙株式会社製）を用いた。散布用の溶液としては、リグニンスルホン酸マグネシウムを水で希釈したものを用いた。希釈倍率は１６倍または３２倍である。
(lignin sulfonate)
As the lignin sulfonate, magnesium lignin sulfonate (P321 powder, manufactured by Nippon Paper Industries Co., Ltd.) was used. As the solution for spraying, magnesium lignin sulfonate diluted with water was used. The dilution factor is 16 times or 32 times.
（カチオン系の材料）
カチオン系の材料は、実施例１及び実施例４ではＰＡＣ（ポリ塩化アルミニウム 大明化学株式会社製）を用い、実施例２及び実施例５ではＰｏｌｙＤＡＤＭＡＣ（ポリジアリルジメチルアンモニウムクロリド 大明化学株式会社製）を用い、実施例３及び実施例６ではメタクリル酸メチルのポリマー（メタクリル樹脂。ＭＴアクアポリマー株式会社製）を用いた。散布用の溶液としては、これらの材料を水で希釈したものを用いた。各溶液の濃度はいずれも１重量％である。
(Cationic material)
As the cationic material, PAC (polyaluminum chloride manufactured by Daimei Chemical Co., Ltd.) was used in Examples 1 and 4, and PolyDADMAC (polydiallyldimethylammonium chloride manufactured by Daimei Chemical Co., Ltd.) was used in Examples 2 and 5. In Examples 3 and 6, a polymer of methyl methacrylate (methacrylic resin, manufactured by MT Aqua Polymer Co., Ltd.) was used. These materials were diluted with water and used as a solution for spraying. The concentration of each solution was 1% by weight.
（実験方法）
容器に敷き詰めた土壌の表面全体に対して均一になるよう、溶液の散布を行った。溶液の散布は、土壌に対して高さ１０ｃｍ程度の位置から霧吹きを用いて行った。実施例１－６の場合、リグニンスルホン酸マグネシウムの溶液の散布を先に行い、その後、カチオン系の材料の溶液の散布を行った。各溶液の散布量は、２Ｌ／ｍ２である。なお、比較例１及び比較例２の場合、リグニンスルホン酸マグネシウムの溶液のみを散布した。
(experimental method)
The solution was spread evenly over the entire surface of the soil spread in the container. The solution was sprayed onto the soil from a position of about 10 cm in height using a sprayer. In the case of Example 1-6, the solution of magnesium ligninsulfonate was first sprayed, and then the solution of the cationic material was sprayed. The spray volume of each solution is 2 L/m 2 . In addition, in the case of Comparative Example 1 and Comparative Example 2, only the solution of magnesium ligninsulfonate was sprayed.
各溶液を散布した土壌を室温（２２℃）で１週間養生した。その後、当該土壌に対してコーン貫入試験を行った。コーン貫入試験は、プッシュコーン（大起理化工業株式会社製）を用いて貫入抵抗量を測定した。求めた貫入抵抗量を支持強度に換算した値により固化の性能を判定した。一般に、土壌の固化が進んでいる場合、支持強度は高い値を示す。 The soil sprayed with each solution was cured at room temperature (22°C) for one week. Thereafter, a cone penetration test was conducted on the soil. In the cone penetration test, the amount of penetration resistance was measured using a push cone (manufactured by Daiki Rika Kogyo Co., Ltd.). The solidification performance was determined by converting the obtained penetration resistance into support strength. Generally, when soil solidification is progressing, the bearing strength shows a high value.
（実験結果）
表１、図１Ａ及び図１Ｂに示したように、実施例１－実施例６の場合、比較例１及び比較例２の場合と比べて、支持強度が高い値を示した。すなわち、リグニンスルホン酸マグネシウムの溶液及びカチオン系の材料の溶液を散布することにより、リグニンスルホン酸マグネシウムの溶液のみを散布する場合よりも、土壌の固化を確実に行うことができた。また、カチオン系の材料のうち、ＰｏｌｙＤＡＤＭＡＣを用いた場合（実施例２及び実施例５）が比較的高い支持強度を示した。これは、ＰｏｌｙＤＡＤＭＡＣがイオン性の強い材料であるため、ゲル化した際の強度が強くなったことに起因すると考えられる。また、実施例４－実施例６の結果から明らかなように、リグニンスルホン酸マグネシウムの溶液の希釈率を高くした場合であっても、リグニンスルホン酸マグネシウムの溶液のみを散布する場合より、土壌の固化を確実に行うことができた。
(Experimental result)
As shown in Table 1, FIG. 1A, and FIG. 1B, the support strength of Examples 1 to 6 was higher than that of Comparative Examples 1 and 2. That is, by spraying the solution of magnesium lignosulfonate and the solution of the cationic material, the soil could be solidified more reliably than when only the solution of magnesium ligninsulfonate was sprayed. Further, among the cationic materials, when PolyDADMAC was used (Example 2 and Example 5), relatively high support strength was exhibited. This is considered to be due to the fact that PolyDADMAC is a highly ionic material and therefore has increased strength when gelled. Furthermore, as is clear from the results of Examples 4 to 6, even when the dilution rate of the magnesium lignosulfonate solution was increased, the soil was more susceptible to soil damage than when only the magnesium lignosulfonate solution was sprayed. Solidification could be achieved reliably.
［溶液を散布する順番について］
リグニンスルホン酸塩の溶液及びカチオン系の材料の溶液を散布する順番について実験を行った。
[About the order of spraying the solution]
An experiment was conducted regarding the order in which the lignin sulfonate solution and the cationic material solution were sprayed.
（土壌、リグニンスルホン酸塩、カチオン系の材料）
土壌及びリグニンスルホン酸塩は、実施例１等で用いたものと同様である。実施例７及び実施例８において、カチオン系の材料は、ＰＡＣ（ポリ塩化アルミニウム 大明化学株式会社製）を用いた。散布用の溶液としては、ＰＡＣを水で希釈したものを用いた。溶液の濃度は１重量％である。
(soil, lignin sulfonate, cationic materials)
The soil and lignin sulfonate are the same as those used in Example 1 and others. In Examples 7 and 8, PAC (polyaluminum chloride manufactured by Daimei Chemical Co., Ltd.) was used as the cationic material. As the solution for spraying, PAC diluted with water was used. The concentration of the solution is 1% by weight.
（実験方法）
実施例７及び実施例８は、実施例１等と同様の方法により行った。但し、実施例７及び実施例８においては、ＰＡＣの溶液の散布を先に行い、その後、リグニンスルホン酸マグネシウムの溶液の散布を行った。各溶液の散布量は２Ｌ／ｍ２である。
(experimental method)
Examples 7 and 8 were carried out in the same manner as in Example 1 and the like. However, in Examples 7 and 8, the PAC solution was first sprayed, and then the magnesium ligninsulfonate solution was sprayed. The spray volume of each solution is 2 L/m 2 .
（実験結果）
表２、図２Ａ及び図２Ｂに示したように、リグニンスルホン酸マグネシウムの溶液及びカチオン系の材料の溶液を散布することにより、溶液の散布の順番によらず高い支持強度を得ることができた。一方、リグニンスルホン酸マグネシウムの溶液を先に散布した場合、カチオン系の材料の溶液を先に散布した場合よりも高い支持強度を得ることができた。これは、水に溶け易いリグニンスルホン酸マグネシウムが先に土壌中に浸透した結果、ゲル化される領域が広くなったためであると考えられる。逆に、カチオン系の材料は土壌に浸透し難いため、カチオン系の材料の溶液を先に散布した場合には、土壌表面でのみゲル化が進行したものと考えられる。
(Experimental result)
As shown in Table 2, Figures 2A and 2B, by spraying the magnesium lignosulfonate solution and the cationic material solution, high support strength could be obtained regardless of the order in which the solutions were sprayed. . On the other hand, when a solution of magnesium ligninsulfonate was first sprayed, a higher supporting strength could be obtained than when a solution of a cationic material was first sprayed. This is thought to be because magnesium lignin sulfonate, which is easily soluble in water, permeated into the soil first, resulting in a wider gelation area. On the other hand, since cationic materials have difficulty penetrating into the soil, if a solution of the cationic material was sprayed first, it is thought that gelation would have progressed only on the soil surface.
Claims (4)
前記土壌表面に対してポリ塩化アルミニウム、ポリジアリルジメチルアンモニウムクロリド、メタクリル酸エステルのポリマー、塩化カルシウム、塩化ナトリウム、硫酸ナトリウム、及び硫酸アルミニウムからなる群から選択される少なくとも一種類以上のカチオン系の材料を含む溶液を散布する第２の処理と、
を含む土壌表面の固化方法。 a first treatment of spraying a solution containing lignin sulfonate on the soil surface;
At least one cationic material selected from the group consisting of polyaluminum chloride, polydiallyldimethylammonium chloride, methacrylic acid ester polymer, calcium chloride, sodium chloride, sodium sulfate, and aluminum sulfate for the soil surface. a second treatment of spraying a solution containing;
Methods of solidifying soil surfaces, including:
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| JP2000328058A (en) | 1999-05-24 | 2000-11-28 | Umeuchi Toshio | Preparation of soil hardening composition |
| JP2015199057A (en) | 2014-04-02 | 2015-11-12 | 国立大学法人茨城大学 | Dispersion type polymer coagulant, soil solidifying agent and coagulation and sedimentation agent, and contamination spreading prevention method of radioactive substance, decontamination method of contaminated soil, vegetation base creation method and water cleaning method |
| JP2019056075A (en) | 2017-09-22 | 2019-04-11 | 株式会社大林組 | Method for producing soil solidification composition and soil solidification method using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000328058A (en) | 1999-05-24 | 2000-11-28 | Umeuchi Toshio | Preparation of soil hardening composition |
| JP2015199057A (en) | 2014-04-02 | 2015-11-12 | 国立大学法人茨城大学 | Dispersion type polymer coagulant, soil solidifying agent and coagulation and sedimentation agent, and contamination spreading prevention method of radioactive substance, decontamination method of contaminated soil, vegetation base creation method and water cleaning method |
| JP2019056075A (en) | 2017-09-22 | 2019-04-11 | 株式会社大林組 | Method for producing soil solidification composition and soil solidification method using the same |
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