JP4748608B2 - Soil-solidifying agent and soil-solidifying method - Google Patents
Soil-solidifying agent and soil-solidifying method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 12
- 239000002689 soil Substances 0.000 claims description 53
- 239000003795 chemical substances by application Substances 0.000 claims description 40
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims description 27
- XAAHAAMILDNBPS-UHFFFAOYSA-L calcium hydrogenphosphate dihydrate Chemical compound O.O.[Ca+2].OP([O-])([O-])=O XAAHAAMILDNBPS-UHFFFAOYSA-L 0.000 claims description 22
- 235000019700 dicalcium phosphate Nutrition 0.000 claims description 22
- 229920000620 organic polymer Polymers 0.000 claims description 14
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 13
- 239000011737 fluorine Substances 0.000 description 13
- 229910052731 fluorine Inorganic materials 0.000 description 13
- 239000010440 gypsum Substances 0.000 description 11
- 229910052602 gypsum Inorganic materials 0.000 description 11
- 238000002156 mixing Methods 0.000 description 8
- 229920002401 polyacrylamide Polymers 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 238000010828 elution Methods 0.000 description 4
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical class [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 241000209149 Zea Species 0.000 description 2
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 2
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000001506 calcium phosphate Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 235000005822 corn Nutrition 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 235000019731 tricalcium phosphate Nutrition 0.000 description 2
- 229910000391 tricalcium phosphate Inorganic materials 0.000 description 2
- 229940078499 tricalcium phosphate Drugs 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- HECLRDQVFMWTQS-UHFFFAOYSA-N Dicyclopentadiene Chemical compound C1C2C3CC=CC3C1C=C2 HECLRDQVFMWTQS-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229940077441 fluorapatite Drugs 0.000 description 1
- 229910052587 fluorapatite Inorganic materials 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Description
本発明は、土壌固化剤及び土壌の固化方法に関し、更に詳しくは、河川、池、湖沼等からの浚渫土や、土木工事現場、建設工事現場等からの排土等、比較的含水率の高い泥状の土壌を固化するための固化剤及び固化方法に関する。 The present invention relates to a soil-solidifying agent and a soil-solidifying method, and more specifically, dredged soil from rivers, ponds, lakes, etc., soil discharged from civil engineering work sites, construction work sites, etc., and the like, which has a relatively high water content. The present invention relates to a solidifying agent and a solidifying method for solidifying muddy soil.
従来、前記のような土壌の固化剤として、半水石膏乃至石膏を用いた各種の例が知られている。これには例えば、半水石膏及び高炉スラグを含有するもの（例えば特許文献１参照）、半水石膏、製紙スラッジ灰、高炉スラグ微粉末及び石灰等を含有するもの（例えば特許文献２参照）、石膏、石灰及び石炭燃焼灰から選ばれる少なくとも一つを含有するもの（例えば特許文献３参照）、半水石膏、マグネシア系固結化助材、無機質吸水性硬化促進材及び無機質硬化助剤等を含有するもの（例えば特許文献４参照）等が挙げられる。 Conventionally, various examples using hemihydrate gypsum or gypsum are known as the soil solidifying agent as described above. Examples thereof include those containing hemihydrate gypsum and blast furnace slag (see, for example, Patent Document 1), those containing hemihydrate gypsum, paper sludge ash, fine powder of blast furnace slag, lime, etc. (see, for example, Patent Document 2), What contains at least one selected from gypsum, lime, and coal combustion ash (see, for example, Patent Document 3), hemihydrate gypsum, magnesia-based caking aid, inorganic water-absorbing hardening accelerator, inorganic hardening aid, etc. What is contained (for example, refer to Patent Document 4).
しかし、かかる従来の土壌固化剤には、それを用いた土壌の固化それ自体に問題は少ないものの、用いる半水石膏や固化する土壌に含まれるフッ素に起因して、固化した土壌からフッ素が溶出するという問題がある。従来の土壌固化剤では、それを用いて固化した土壌からのフッ素の溶出量を、土壌環境基準の０．８mg／Ｌ以下にまで確実に低減させることが難しいのである。
本発明が解決しようとする課題は、それを用いて固化した土壌からのフッ素の溶出量を土壌環境基準の０．８mg／Ｌ以下にまで確実に低減させることができる土壌固化剤及びこれを用いる土壌の固化方法を提供する処にある。 The problem to be solved by the present invention is to use a soil solidifying agent capable of reliably reducing the amount of fluorine eluted from the soil solidified by using the soil to 0.8 mg / L or less of the soil environment standard. It is a place that provides a method for solidifying soil.
前記の課題を解決する本発明は、半水石膏及びリン酸水素カルシウム二水和物から成り、且つ半水石膏１００質量部当たり、リン酸水素カルシウム二水和物を２〜１０質量部の割合で含有して成ることを特徴とする土壌固化剤に係る。また本発明は、半水石膏、リン酸水素カルシウム二水和物及び有機高分子凝集剤から成り、且つ半水石膏１００質量部当たり、リン酸水素カルシウム二水和物を２〜１０質量部及び有機高分子凝集剤を０．１〜１質量部の割合で含有して成ることを特徴とする土壌固化剤に係る。更に本発明は、土壌に有機高分子凝集剤を混合し、引き続き該土壌１ｍ３当たりこれらの本発明に係る土壌固化剤を１００〜１７０kgの割合で混合することを特徴とする土壌の固化方法に係る。 This invention which solves the above-mentioned subject consists of hemihydrate gypsum and calcium hydrogenphosphate dihydrate, and is a ratio of 2-10 mass parts of calcium hydrogenphosphate dihydrate per 100 mass parts of hemihydrate gypsum. It relates to a soil solidifying agent characterized by comprising. The present invention also comprises hemihydrate gypsum, calcium hydrogen phosphate dihydrate and an organic polymer flocculant, and 2 to 10 parts by mass of calcium hydrogen phosphate dihydrate per 100 parts by mass of hemihydrate gypsum. The present invention relates to a soil solidifying agent comprising an organic polymer flocculant in a proportion of 0.1 to 1 part by mass. Furthermore, the present invention provides a method for solidifying a soil, characterized in that an organic polymer flocculant is mixed into the soil, and subsequently the soil solidifying agent according to the present invention is mixed at a rate of 100 to 170 kg per 1 m 3 of the soil. Related.
本発明に係る土壌固化剤（以下、単に本発明の固化剤という）は、半水石膏（ＣａＳＯ４・１／２Ｈ２Ｏ）及びリン酸水素カルシウム二水和物（ＣａＨＰＯ４・２Ｈ２Ｏ）から成るものである。半水石膏は、各種の石膏、例えばリン鉱石から湿式リン酸法によりリン酸を生成させる際の副産物として得られる石膏、石灰法により排煙脱硫する際の副産物として得られる石膏等を、１２０〜１６０℃程度で加熱処理することにより得られる。またこれらの石膏を用いて製造した石膏ボードの廃材（以下、単に廃石膏という）を粉砕し、同様に加熱処理することによっても得られる。半水石膏として廃石膏由来のものを用いると、処分の面倒な廃石膏を有効利用できる。 The soil solidifying agent according to the present invention (hereinafter simply referred to as the solidifying agent of the present invention) is composed of hemihydrate gypsum (CaSO 4 · 1 / 2H 2 O) and calcium hydrogen phosphate dihydrate (CaHPO 4 · 2H 2 O). It consists of Hemihydrate gypsum is various types of gypsum, such as gypsum obtained as a by-product when producing phosphoric acid from a phosphate ore by a wet phosphoric acid method, gypsum obtained as a by-product when performing flue gas desulfurization by a lime method, etc. It can be obtained by heat treatment at about 160 ° C. It can also be obtained by pulverizing gypsum board waste materials (hereinafter simply referred to as waste gypsum) produced using these gypsums and heat-treating them in the same manner. When the one derived from waste gypsum is used as the hemihydrate gypsum, waste gypsum that is troublesome to dispose of can be used effectively.
前記のような半水石膏と共に用いる薬剤はリン酸水素カルシウム二水和物である。リン酸水素カルシウム二水和物に代えて他のリン酸カルシウム化合物、例えばリン酸三カルシウム（Ｃａ３（ＰＯ４）２）を使用することも考えられるが、その効果すなわちフッ素の溶出量を低減させるという効果はリン酸水素カルシウム二水和物に比べて著しく劣る。 The drug used with such hemihydrate gypsum is calcium hydrogen phosphate dihydrate. It is conceivable to use other calcium phosphate compounds such as tricalcium phosphate (Ca 3 (PO 4 ) 2 ) instead of calcium hydrogen phosphate dihydrate, but the effect, ie, the amount of fluorine elution is reduced. The effect is significantly inferior compared to calcium hydrogen phosphate dihydrate.
本発明の固化剤において、半水石膏及びリン酸水素カルシウム二水和物の含有割合は、半水石膏１００質量部当たり、リン酸水素カルシウム二水和物を２〜１０質量部の割合で含有するものとするが、リン酸水素カルシウム二水和物を３〜８質量部の割合で含有するものとするのが好ましい。半水石膏１００質量部当たり、リン酸水素カルシウム二水和物の含有割合を３質量部未満にすると、効果がやや低くなる傾向を示し、逆にリン酸水素カルシウム二水和物の含有割合を８質量部超にしても、効果はそれほどに変わらず、それだけ非経済的になるからである。 In the solidifying agent of the present invention, the content ratio of hemihydrate gypsum and calcium hydrogen phosphate dihydrate is 2 to 10 parts by mass of calcium hydrogen phosphate dihydrate per 100 parts by mass of hemihydrate gypsum. However, it is preferable to contain 3 to 8 parts by mass of calcium hydrogen phosphate dihydrate. When the content ratio of calcium hydrogen phosphate dihydrate is less than 3 parts by mass per 100 parts by weight of hemihydrate gypsum, the effect tends to be slightly reduced. Conversely, the content ratio of calcium hydrogen phosphate dihydrate is Even if it exceeds 8 parts by mass, the effect does not change so much, and it becomes uneconomical.
本発明の固化剤は、前記のような半水石膏及びリン酸水素カルシウム二水和物から成るものとすることもできるが、これらに加えて更に有機高分子凝集剤から成るものとすることもできる。かかる有機高分子凝集剤としては、ポリアクリルアミド系、ポリアクリル酸ナトリウム系、ポリアクリル酸エステル系、ポリメタクリル酸エステル系等、各種が挙げられるが、ポリアクリルアミド系のものが好ましい。またかかる有機高分子凝集剤の含有割合は、半水石膏１００質量部当たり０．１〜１質量部とする。 The solidifying agent of the present invention may comprise hemihydrate gypsum and calcium hydrogen phosphate dihydrate as described above, but may further comprise an organic polymer flocculant in addition to these. it can. Examples of the organic polymer flocculant include various types such as polyacrylamide, sodium polyacrylate, polyacrylate, polymethacrylate, and the like, but polyacrylamide is preferable. Moreover, the content rate of this organic polymer flocculant shall be 0.1-1 mass part per 100 mass parts of hemihydrate gypsum.
本発明の固化剤は、これを前記のような比較的含水率の高い泥状の土壌、一般的には含水率（水分）が４０〜７０質量％の泥状の土壌と混合すると、かかる泥状の土壌を固化するだけでなく、固化した土壌からのフッ素の溶出量を土壌環境基準の０．８mg／Ｌ以下にまで確実に低減させる。これは、本発明の固化剤を前記のような比較的含水率の高い泥状の土壌と混合すると、固化剤中のリン酸水素カルシウム二水和物の粒子表面がそこに大きさ数十ｎｍ程度の多数の微細結晶が析出した構造のものとなって活性化し、かくして活性化した粒子表面が固化剤中の半水石膏や固化処理する土壌に含まれるフッ素をフッ素アパタイトとして効率的に不溶化するためと考えられる。かかるリン酸水素カルシウム二水和物の特徴的な作用効果は、他のリン酸カルシウム化合物、例えばリン酸三カルシウムでは得られない。 When the solidifying agent of the present invention is mixed with muddy soil having a relatively high moisture content as described above, generally mud soil having a moisture content (moisture) of 40 to 70% by mass, such mud is mixed. In addition to solidifying the soil, the amount of fluorine eluted from the solidified soil is reliably reduced to 0.8 mg / L or less of the soil environment standard. This is because when the solidifying agent of the present invention is mixed with the muddy soil having a relatively high water content as described above, the particle surface of calcium hydrogen phosphate dihydrate in the solidifying agent has a size of several tens of nm. Activated in the form of a structure in which a large number of fine crystals are deposited, and the activated particle surface effectively insolubilizes the fluorine contained in hemihydrate gypsum in the solidifying agent and the soil to be solidified as fluorapatite. This is probably because of this. The characteristic effects of such calcium hydrogen phosphate dihydrate cannot be obtained with other calcium phosphate compounds such as tricalcium phosphate.
本発明の固化剤は、これを直接、前記のような比較的含水率の高い泥状の土壌と混合することもできるが、かかる土壌に予め前記のような有機高分子凝集剤を混合しておき、引き続いて本発明の固化剤を混合する方法が好ましい。例えば、スクリューコンベヤを用いて泥状の土壌を搬送しつつ、その上流側で有機高分子凝集剤を加えて混合し、またその中流側で本発明の固化剤を加えて混合する方法が挙げられる。 The solidifying agent of the present invention can be directly mixed with the muddy soil having a relatively high water content as described above, but the organic polymer flocculant as described above is mixed in advance with such soil. A method of subsequently mixing the solidifying agent of the present invention is preferred. For example, while conveying mud soil using a screw conveyor, an organic polymer flocculant is added and mixed on the upstream side, and the solidifying agent of the present invention is added and mixed on the midstream side. .
本発明によると、泥状の土壌を固化することができるだけでなく、固化した土壌からのフッ素の溶出量を土壌環境基準の０．８mg／Ｌにまで確実に低減させることができる。 According to the present invention, not only can muddy soil be solidified, but also the amount of fluorine eluted from the solidified soil can be reliably reduced to 0.8 mg / L of the soil environment standard.
試験区分１（固化剤の調製）
実施例１｛固化剤（Ｐ−１）の調製｝
廃石膏を粉砕し、１４０〜１６０℃で１０分間程度加熱処理して、半水石膏とした。この半水石膏１００質量部当たり、リン酸水素カルシウム二水和物を２質量部の割合で混合して、固化剤（Ｐ−１）を調製した。
Test Category 1 (Preparation of solidifying agent)
Example 1 {Preparation of solidifying agent (P-1)}
The waste gypsum was pulverized and heat-treated at 140 to 160 ° C. for about 10 minutes to obtain a half-water gypsum. A solidifying agent (P-1) was prepared by mixing calcium hydrogen phosphate dihydrate at a ratio of 2 parts by mass per 100 parts by mass of the hemihydrate gypsum.
実施例２〜６及び比較例１｛固化剤（Ｐ−２）〜（Ｐ−６）及び（Ｒ−１）の調製｝
実施例１の固化剤（Ｐ−１）と同様にして、実施例２〜６の固化剤（Ｐ−２）〜（Ｐ−６）及び比較例１の固化剤（Ｒ−１）を調製した。実施例６の固化剤（Ｐ−６）は更にポリアクリルアミド系の有機高分子凝集剤を混合し、また比較例１の固化剤は半水石膏だけを用いた。以上の各例で調製した固化剤の内容を表１にまとめて示した。
Examples 2 to 6 and Comparative Example 1 {Preparation of solidifying agents (P-2) to (P-6) and (R-1)}
In the same manner as the solidifying agent (P-1) of Example 1, the solidifying agents (P-2) to (P-6) of Examples 2 to 6 and the solidifying agent (R-1) of Comparative Example 1 were prepared. . The solidifying agent (P-6) of Example 6 was further mixed with a polyacrylamide organic polymer flocculant, and the solidifying agent of Comparative Example 1 was only hemihydrate gypsum. The contents of the solidifying agent prepared in each of the above examples are summarized in Table 1.
表１において、
ＤＣＰＤ：リン酸水素カルシウム二水和物
＊１：ポリアクリルアミド系の有機高分子凝集剤
In Table 1,
DCPD: Calcium hydrogen phosphate dihydrate * 1: Polyacrylamide organic polymer flocculant
試験区分２（土壌の固化）
実施例７
土木工事現場で掘削した排土（含水率６０質量％、比重１．６、シルト分の少ないほぼ無臭の良質な泥状の土壌、以下原泥という）１ｍ３当たり、予めポリアクリルアミド系の有機高分子凝集剤を０．１５kgとなる割合で混合し、引き続き試験区分１で調製した固化剤（Ｐ−１）を１００kgとなる割合で混合して、原泥を固化した。混合はスクリューコンベヤを用いて行ない、原泥をスクリューコンベヤに投入して搬送しつつ、その上流側でポリアクリルアミド系の有機高分子凝集剤を投入し、またその直後に固化剤（Ｐ−１）を投入した。固化剤（Ｐ−１）を投入後のスクリューコンベヤによる混合時間は約２５秒間であった。
Test category 2 (solidification of soil)
Example 7
Dumping of excavated civil engineering construction site (water content 60 wt%, specific gravity 1.6, good muddy soil almost odorless less silt, hereinafter referred to as the original mud) 1 m 3 per pre polyacrylamide organic high The molecular flocculant was mixed at a rate of 0.15 kg, and then the solidifying agent (P-1) prepared in Test Category 1 was mixed at a rate of 100 kg to solidify the raw mud. Mixing is carried out using a screw conveyor. While feeding the raw mud into the screw conveyor, a polyacrylamide organic polymer flocculant is introduced upstream, and immediately thereafter a solidifying agent (P-1). Was introduced. The mixing time by the screw conveyor after charging the solidifying agent (P-1) was about 25 seconds.
実施例８〜２４及び比較例２〜４
実施例７と同様にして、表２に記載した各例の条件下で原土を固化した。
Examples 8 to 24 and Comparative Examples 2 to 4
In the same manner as in Example 7, the raw soil was solidified under the conditions of each example described in Table 2.
試験区分３（固化した土壌の評価）
試験区分２の各例で固化した土壌について、当日、１０日後、２８日後及び９０日後に、フッ素溶出量、コーン指数及びｐＨを以下の方法で求め、結果を表２及び３にまとめて示した。
フッ素溶出量：固化した土壌５０ｇに純水５００mlを加え、毎分２００回で６時間振盪し、１０分間静置した後、上澄液を０．４５ｎｍのメンブレンフィルターで濾過して溶出液を得た。そしてこの溶出液中のフッ素濃度をイオン選択性電極で測定した（定量下限は０．０２mg／Ｌ）。以下の各例についても、フッ素の溶出量は同様の方法で測定した。
コーン指数：ＪＩＳ−Ａ１２２８にしたがい、固化した土壌を締固め、コーン指数を測定した。
ｐＨ：地盤工学会基準（ＪＧＳ０２１１−２０００）にしたがい、固化した土壌の懸濁液についてｐＨを測定した。
Test Category 3 (Evaluation of solidified soil)
About the soil solidified in each example of Test Category 2, the fluorine elution amount, the corn index and the pH were obtained by the following methods after 10 days, 28 days and 90 days, and the results are summarized in Tables 2 and 3. .
Fluorine elution volume: 500 ml of pure water was added to 50 g of solidified soil, shaken at 200 times per minute for 6 hours, allowed to stand for 10 minutes, and then the supernatant was filtered through a 0.45 nm membrane filter to obtain an eluate. It was. The fluorine concentration in the eluate was measured with an ion selective electrode (lower limit of quantification was 0.02 mg / L). In each of the following examples, the elution amount of fluorine was measured by the same method.
Corn index: According to JIS-A1228, the solidified soil was compacted and the cone index was measured.
pH: According to the Geotechnical Society Standard (JGS0211-2000), the pH of the solidified soil suspension was measured.
表２及び３において、
混合割合：原泥１ｍ３当たりの固化剤の混合量
当日：原泥に固化剤を混合した直後のもの
原泥：固化剤を混合する前の原泥それ自体
半水石膏：固化剤に用いた半水石膏
In Tables 2 and 3,
Mixing ratio: the mixing amount on the day of the original mud 1 m 3 per solidifying agent: those original mud immediately after mixing the solidifying agent in the original mud: Hara mud before mixing the solidifying agent itself hemihydrate gypsum: using solidification agents Hemihydrate gypsum
表１〜３の各比較例に対する各実施例の内容及び結果からも明らかなように、本発明の固化剤によると、原泥を固化するだけでなく、固化した土壌からのフッ素の溶出量を土壌環境基準の０．８mg／Ｌにまで確実に低減させることがわかる。 As is clear from the contents and results of each example for each comparative example in Tables 1 to 3, according to the solidifying agent of the present invention, not only does the solid mud solidify, but also the amount of fluorine eluted from the solidified soil. It turns out that it reduces reliably to 0.8 mg / L of soil environmental standard.
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