JP2007229574A - Method for modifying alkaline soil to be recycled - Google Patents
Method for modifying alkaline soil to be recycled Download PDFInfo
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- JP2007229574A JP2007229574A JP2006052352A JP2006052352A JP2007229574A JP 2007229574 A JP2007229574 A JP 2007229574A JP 2006052352 A JP2006052352 A JP 2006052352A JP 2006052352 A JP2006052352 A JP 2006052352A JP 2007229574 A JP2007229574 A JP 2007229574A
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- 239000002689 soil Substances 0.000 title claims abstract description 147
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000010276 construction Methods 0.000 claims abstract description 64
- 239000010802 sludge Substances 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 14
- 230000000087 stabilizing effect Effects 0.000 claims abstract 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 239000004576 sand Substances 0.000 claims description 20
- 238000000746 purification Methods 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 13
- 238000002407 reforming Methods 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 7
- 238000006386 neutralization reaction Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 2
- 239000002440 industrial waste Substances 0.000 abstract description 11
- 230000003472 neutralizing effect Effects 0.000 abstract description 9
- 238000001914 filtration Methods 0.000 abstract 1
- 241000196324 Embryophyta Species 0.000 description 15
- 238000002474 experimental method Methods 0.000 description 6
- 238000004064 recycling Methods 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 240000008042 Zea mays Species 0.000 description 4
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 4
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 4
- 235000005822 corn Nutrition 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- -1 phosphate compound Chemical class 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 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 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 238000001139 pH measurement Methods 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
この発明は、アルカリ性リサイクル土の改質方法に関し、さらに詳細には、建設工事に伴って発生する発生土を原材料とし、アルカリ性を示すリサイクル土の改質技術に関する。 The present invention relates to a method for reforming alkaline recycled soil, and more particularly, to a technology for reforming recycled soil that exhibits alkalinity using generated soil generated during construction as a raw material.
近年、環境への意識が高まり、建設工事に伴って発生する発生土に関しても、そのリサイクル利用が進められている。発生土は、建設大臣官房技術調査室監修・「建設汚泥リサイクル指針」によれば、図１に示すように、建設発生土と建設汚泥に区分される。建設発生土は、さらに浚渫土とそれ以外の建設発生土に区分され、表１に示す土質区分基準（上記「建設汚泥リサイクル指針」より抜粋）において第１〜第４種建設発生土に該当する場合は、そのまま、あるいは施工上の工夫をしてリサイクル利用することが可能である。 In recent years, awareness of the environment has increased, and recycling of soil generated from construction work has been promoted. According to the “Construction Sludge Recycling Guidelines” supervised by the Minister of Construction's Secretariat Technology Research Office, the generated soil is classified into construction generated soil and construction sludge as shown in FIG. The construction generated soil is further classified into dredged soil and other construction generated soil, and corresponds to the first to fourth type construction generated soil in the soil classification criteria shown in Table 1 (extracted from the "construction sludge recycling guidelines" above). In this case, it is possible to recycle as it is or after contriving the construction.
他方、建設汚泥は土質区分基準において泥土に該当し、建設発生土のようにはリサイクル利用することができず、産業廃棄物として取り扱われている。すなわち、建設汚泥は、上記「建設汚泥リサイクル指針」によれば、「掘削工事から生じる泥状の掘削物および泥水を泥土といい、このうち廃棄物処理法に規定する産業廃棄物として取り扱われるものを建設汚泥という。」と定義され、リサイクル利用できない。 On the other hand, construction sludge falls under the soil classification standards and cannot be recycled like construction-generated soil, and is handled as industrial waste. In other words, according to the “Construction Sludge Recycling Guidelines”, construction sludge is called “mud excavated material and mud from the excavation work as mud soil, and of these, it is treated as industrial waste as defined in the Waste Management Law. Is called construction sludge. "
このため、建設汚泥にセメント系や石灰系などの固化材を加えて化学的に安定処理し、その性状を変えることが行われている。この安定処理された土は改良土と称され、安定処理の結果、土質区分基準における第１〜第４種建設発生土に相当する性状を有することになれば、これら第１〜第４種建設発生土と同様にリサイクル利用することが可能となる。
しかしながら、改良土は、上述のようにセメント系や石灰系などの固化材を加えて安定処理したものであるため高アルカリ性を示す。このため、改良土に含まれるアルカリ分が雨水などに溶けて河川などに流れ込み、自然環境を悪化することが懸念され、その用途も制限される。 However, the improved soil exhibits high alkalinity because it is stabilized by adding a solidified material such as cement or lime as described above. For this reason, there is a concern that the alkali contained in the improved soil will dissolve in rainwater and flow into rivers and the like, deteriorating the natural environment, and its use is also limited.
このようなことから、従来、改良土を含むアルカリ性土壌を中和する方法が種々提案されている。例えば、特許文献１には、アルカリ性土壌に燐酸化合物を含む物質およびアルミニウム化合物を含む物質を加える中和方法が開示されている。また、特許文献２には、アルカリ性土壌に硫酸第一鉄を混合する中和方法が開示されている。さらに、特許文献３にはアルカリ性土壌に硫酸鉄、イオウから選ばれる少なくとも一種と、酸性炭化物とが含有された中和剤を混合する中和方法が開示されている。さらに、特許文献４にはアルカリ性土壌に糟糠類を添加混合して、嫌気的発酵を行うことにより中和する方法が開示されている。
For these reasons, various methods for neutralizing alkaline soil including improved soil have been proposed. For example, Patent Document 1 discloses a neutralization method in which a substance containing a phosphate compound and a substance containing an aluminum compound are added to alkaline soil.
しかしながら、これら従来技術は、いずれも中和処理することによって、産業廃棄物である建設汚泥のリサイクル利用を促進するという意義はあるものの、他の産業廃棄物の低減に寄与するものではない。
この発明は上記のような技術的背景に基づいてなされたものであって、次の目的を達成するものである。
この発明の目的は、建設工事に伴って発生する発生土を原材料とするアルカリ性リサイクル土を中和処理するに際し、産業廃棄物として処分されている他の土材料を中和材料として用いることにより、産業廃棄物全般の低減に大きく寄与することができるアルカリ性リサイクル土の改質方法を提供することにある。
The present invention has been made based on the technical background as described above, and achieves the following object.
The purpose of the present invention is to neutralize alkaline recycled soil using the generated soil generated by construction work as a raw material, by using other soil materials disposed as industrial waste as a neutralizing material, An object of the present invention is to provide a method for reforming alkaline recycled soil that can greatly contribute to the reduction of industrial waste in general.
この発明の発明者らは、上記課題を解決するために鋭意検討を重ねた結果、浄水場で発生する脱水ケーキに着目した。浄水場では、河川、貯水池あるいは井戸から取水された原水にＰＡＣ（ポリ塩化アルミニウム）あるいは硫酸バンド（硫酸アルミニウム）を凝集剤として添加し、沈殿池で沈殿処理される。この沈殿池で発生する汚泥は、濃縮されたうえで脱水機により脱水されて、固形物の脱水ケーキとされる。この脱水ケーキは、造粒固化する等して植生用土などにリサイクル利用はされているものの、その多くは産業廃棄物として埋立処分されているいるのが現状である。 The inventors of the present invention have paid attention to dehydrated cake generated in a water purification plant as a result of intensive studies to solve the above problems. In the water purification plant, PAC (polyaluminum chloride) or sulfuric acid band (aluminum sulfate) is added as a flocculant to the raw water taken from rivers, reservoirs or wells, and is precipitated in the sedimentation tank. The sludge generated in the sedimentation basin is concentrated and then dehydrated by a dehydrator to obtain a solid dehydrated cake. Although this dehydrated cake is recycled to vegetation soil by granulating and solidifying, etc., most of it is currently landfilled as industrial waste.
浄水場汚泥には上記のように酸性の凝集剤が含まれることから、その脱水ケーキもｐＨ７付近の中性あるいはそれ以下の弱酸性を示す。そこで、この発明の発明者らは建設汚泥の改良土に浄水場脱水ケーキを加えて混合処理をしてみたところ、改良土のアルカリ度が大幅に改善されることを見出した。
Since the water purification plant sludge contains an acidic flocculant as described above, the dewatered cake also exhibits a weak acidity of neutral or lower than
この発明は上記のような知見に基づいてなされたものであって、次のような手段を採用している。 The present invention has been made on the basis of the above knowledge, and employs the following means.
すなわち、この発明は、建設工事に伴って発生する発生土を原材料とするアルカリ性リサイクル土に、浄水場で発生した脱水ケーキを加えて混合し、中和処理することを特徴とするアルカリ性リサイクル土の改質方法にある。 That is, the present invention is an alkaline recycle soil characterized by adding a dehydrated cake generated at a water purification plant to an alkaline recycle soil made from the generated soil generated by construction work and mixing and neutralizing it. It is in the reforming method.
前記リサイクル土とは、建設工事に伴って発生する発生土を原材料とし、リサイクル利用することができる土材料のことである。したがって、リサイクル土としては、建設汚泥を安定処理して得られた改良土、具体的には「建設汚泥リサイクル指針」で示される土質区分基準において第１〜第４種改良土に相当するものが挙げられる。 The recycled soil is a soil material that can be recycled by using the generated soil generated during construction as a raw material. Therefore, as the reclaimed soil, improved soil obtained by stably treating construction sludge, specifically, those corresponding to the 1st to 4th class improved soil in the soil classification criteria indicated in the “Construction Sludge Recycling Guidelines” Can be mentioned.
また、リサイクル土としては、何ら安定処理の必要のない建設発生土そのもの、具体的には同土質区分基準において第１〜第４種建設発生土に相当するものが挙げられる。このような建設発生土を挙げたのは、例えばセメント系や石灰系の固化材を用いて地盤改良した地盤などは、その掘削土がアルカリ性を示すからである。 In addition, as the recycled soil, construction generated soil which does not require any stable treatment, specifically, soil corresponding to the first to fourth type construction generated soil in the same soil classification standard can be cited. The reason why such construction-generated soil is cited is that, for example, ground that has been improved by using a cement-based or lime-based solidified material, etc., shows that the excavated soil is alkaline.
さらに、リサイクル土としては、建設発生土を安定処理して得られた改良土、具体的には浚渫泥土を安定処理した改良土、あるいは、例えば第４種建設発生土を安定処理して第３種改良土とするように、その性状を改良して上位の改良土としたものが挙げられる。 Furthermore, as the recycled soil, the improved soil obtained by stably treating the construction generated soil, specifically, the improved soil obtained by stably treating the dredged mud soil, or the third treated construction soil, for example, the third treated soil. As a seed-modified soil, there is one that has been improved as a top-level improved soil.
前記建設汚泥の改良土は、例えば、泥水からなる建設汚泥を砂分離し、砂分離後の泥水を脱水して得られた脱水ケーキと、泥土又はセメント混入汚泥からなる建設汚泥とに固化材を添加し、混合して生成される。アルカリ性リサイクル土と、浄水場脱水ケーキとを混合するに際し、改質リサイクル土の強度すなわちコーン指数を増大させるために、建設発生土としての砂を加えて混合するようにしてもよい。この場合、砂は泥水からなる建設汚泥を砂分離して得られたものを使用することができる。 The improved soil of the construction sludge is, for example, a solidified material in a dewatered cake obtained by separating sand from construction sludge made of muddy water and dewatering the muddy water after sand separation and construction sludge made of mud or cement-mixed sludge. It is produced by adding and mixing. When mixing the alkaline recycled soil and the water purification plant dewatered cake, in order to increase the strength of the modified recycled soil, that is, the corn index, sand as construction generated soil may be added and mixed. In this case, sand obtained by separating the construction sludge made of muddy water into sand can be used.
なお、この明細書でいう中和処理とは、アルカリ性リサイクル土のｐＨを低下させる処理のことであって、必ずしも、ｐＨが中性領域になるように処理することを意味するものではない。 The neutralization treatment referred to in this specification is a treatment for lowering the pH of the alkaline recycled soil, and does not necessarily mean that the treatment is performed so that the pH is in a neutral region.
この発明によれば、建設工事に伴って発生する発生土を原材料とするアルカリ性リサイクル土を中和処理するに際し、その多くが産業廃棄物として処分されている浄水場脱水ケーキを中和材料として用いるので、産業廃棄物全般の低減に大きく寄与することができる。 According to the present invention, when neutralizing alkaline recycled soil using raw soil generated from construction work as a raw material, water purification plant dewatered cake, most of which is disposed of as industrial waste, is used as a neutralizing material. Therefore, it can greatly contribute to the reduction of industrial waste in general.
この発明の実施形態を図面を参照しながら以下に説明する。図２は建設汚泥を安定処理して改良土（リサイクル土）を得る工程、及びその改良土を中和処理する工程を示す図である。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a process of obtaining a modified soil (recycled soil) by stably treating construction sludge and a process of neutralizing the modified soil.
建設汚泥は建設現場よりダンプトラックにより処理場に搬入される。その際、建設汚泥は泥水（泥水状汚泥）と、泥土（泥土状汚泥）と、セメント混入汚泥とに分別して搬入される。泥水は、地中連続壁工法や泥水式シールド工法等によって発生する含水比が高い建設汚泥である。泥土は、泥土圧シールド工法等によって発生する含水比が比較的低い建設汚泥である。また、セメント混入汚泥は、セメントミルクを用いた地盤改良工法等によって発生するセメント成分を含有した建設汚泥である。 Construction sludge is carried to the treatment plant by a dump truck from the construction site. At that time, construction sludge is separated into mud (muddy sludge), mud (mud sludge), and cement-mixed sludge. The muddy water is a construction sludge having a high moisture content generated by the underground continuous wall method or the muddy water type shield method. Mud is construction sludge with a relatively low water content generated by the mud pressure shield method. Cement-mixed sludge is construction sludge containing a cement component generated by a ground improvement method using cement milk or the like.
泥水はサンドフィルタ１によって砂分が分離され、砂分離された泥水は遠心脱水機２により脱水される。一方、泥土及びセメント混入汚泥はいったん貯留槽３に貯溜される。そして、その上水が砂分離された泥水とともに遠心脱水機２により脱水され、固形状の脱水ケーキとされる。貯留槽３に溜まった泥土は、脱水ケーキとともにセメント系や石灰系などの固化材が添加されて、固化脱水機４で混合され、改良土（リサイクル土）とされる。
The muddy water is separated from the sand by the sand filter 1, and the muddy water separated from the sand is dehydrated by the
以上のようなプロセスで得られた改良土は、１日残置後のコーン指数が 200KN/m2 以上となり、10 日養生後では 400 〜 500KN/m2 程度の強度を示す。また、改良土は、アルカリ性の固化材によって安定処理されていることから、ｐＨは９〜１１とアルカリ性を示す。 The improved soil obtained by the process as described above has a corn index of 200 KN / m 2 or more after 1 day of retention, and a strength of 400 to 500 KN / m 2 after 10 days of curing. Moreover, since the improved soil is stably treated with an alkaline solidifying material, the pH is 9 to 11 and alkaline.
この改良土は１日残置されたのち、浄水場より搬入される脱水ケーキと改質混合機５により混合される。脱水ケーキは、一般に、砂分を含まない細粒土（シルト、粘性土）からなり、含水率が 50% 程度、コーン指数が 400 〜 500KN/m2 程度、ｐＨが６〜７程度の性状のものである。この脱水ケーキと改良土を混合することにより、改質リサイクル土が得られる。改質リサイクル土は、１０日間養生され、その結果、コーン指数 400KN/m2 以上 の強度を示し、ｐＨは７〜９に低下する。この改質リサイクル土は、宅地造成、農地造成、園芸用土、農業用土、その他広範の用途に使用することができる。
This improved soil is left for one day, and then mixed with the dewatered cake carried from the water purification plant by the reforming
改良土と脱水ケーキとの混合比は、改質リサイクル土の用途に応じて適宜決定され、重量比で改良土１に対し、脱水ケーキが１〜５の比率とされる。また、改質リサイクル土の強度を大きくする場合は、建設現場で発生した砂を混合する。砂としては、サンドフィルタ１により泥水から分離したものを使用することができる。砂を混合する場合も、その混合比は改質リサイクル土の用途に応じて適宜決定される。 The mixing ratio of the improved soil and the dewatered cake is appropriately determined according to the use of the modified recycled soil, and the weight ratio of the dewatered cake to the improved soil 1 is 1 to 5. Also, when increasing the strength of the modified recycled soil, sand generated at the construction site is mixed. As the sand, sand separated from the muddy water by the sand filter 1 can be used. Also when sand is mixed, the mixing ratio is appropriately determined according to the use of the modified recycled soil.
なお、建設発生土を安定化処理する場合は、図２の固化脱水機４で処理して改良土を得ることができる。また、安定処理を要しないアルカリ性を示す建設発生土については、直接、改質混合機５で浄水場からの脱水ケーキと混合する。
In addition, when carrying out the stabilization process of construction generation | occurrence | production soil, it can process with the
＜実施例１＞建設汚泥の改良土(ｐＨ 9.1 )と、甲浄水場脱水ケーキ（ｐＨ 6.0 )とを混合し中和処理する実験を行った。混合比を重量比で１：１とした改良土（ 1,000g ）及び脱水ケーキ（ 1,000g ）をミキサーで十分混合した（Ａ，Ｂの２サンプル）。混合土（改質リサイクル土）のｐＨを測定したところ、表２に示すように、混合Ａ及び混合ＢともにｐＨが 7.2 と低下し、ほぼ中性となった。なお、ｐＨの測定は、以下の各実施例も含めて、土質工学会基準「土のｐＨ試験方法（JSF T 211-1990）」にしたがって行った。 <Example 1> An experiment was conducted in which the improved soil of construction sludge (pH 9.1) and the water purification plant dehydrated cake (pH 6.0) were mixed and neutralized. Improved soil (1,000 g) with a mixing ratio of 1: 1 by weight and dehydrated cake (1,000 g) were sufficiently mixed with a mixer (two samples A and B). When the pH of the mixed soil (modified recycled soil) was measured, as shown in Table 2, the pH of both the mixed A and the mixed B decreased to 7.2 and became almost neutral. In addition, the measurement of pH was performed according to the soil engineering society standard “Soil pH test method (JSF T 211-1990)” including the following examples.
＜実施例２＞建設汚泥の改良土(ｐＨ 10.33 )と、乙浄水場脱水ケーキ（ｐＨ 7.04 )とを混合し中和処理する実験を行った。この実験では、建設現場より発生した砂（ｐＨ 10.19 ）を加えた。そして、改良土と砂との混合比を１：１と固定し（いずれも重量 1,000g ）、脱水ケーキの混合比を改良土に対して１〜４と変化させ、混合土のｐＨの時間的な変化を測定した。その結果を表３及び図３に示す。混合土のｐＨは脱水ケーキの量を増減することにより調整可能であり、また、７日経過した後でもアルカリ性の戻り現象が見られないことが分かる。 <Example 2> An experiment was carried out in which the improved soil of construction sludge (pH 10.33) and the dewatered cake (pH 7.04) of Oto Purification Plant were mixed and neutralized. In this experiment, sand (pH 10.19) generated from the construction site was added. Then, the mixing ratio of the improved soil and sand was fixed to 1: 1 (both weighed 1,000 g), and the mixing ratio of the dehydrated cake was changed to 1 to 4 with respect to the improved soil, and the pH of the mixed soil was changed over time Changes were measured. The results are shown in Table 3 and FIG. It can be seen that the pH of the mixed soil can be adjusted by increasing / decreasing the amount of dehydrated cake, and no alkaline return phenomenon is observed even after 7 days.
＜実施例３＞建設汚泥の改良土(ｐＨ 10.33 )と、丙浄水場脱水ケーキ（ｐＨ 7.01 )とを混合し中和処理する実験を行った。実験内容は、脱水ケーキの発生浄水場が異なるだけで、その他は実施例２と同じである。実験結果を表４及び図４に示す。この実験によっても、混合土のｐＨは脱水ケーキの量に応じて変化し、また、７日経過した後でもアルカリ性の戻り現象が見られなかった。 <Example 3> An experiment was conducted in which the soil for improving construction sludge (pH 10.33) and a dewatered cake (pH 7.01) in a water purification plant were mixed and neutralized. The contents of the experiment are the same as in Example 2 except that the water purification plant for generating dehydrated cake is different. The experimental results are shown in Table 4 and FIG. Also in this experiment, the pH of the mixed soil changed according to the amount of dehydrated cake, and no alkaline return phenomenon was observed even after 7 days.
表５は、実施例２で得られた混合土のコーン指数を示している。これらの数値は、上記土質区分基準の第２種改良土に相当し、したがって改質リサイクル土は強度の点からも河川堤防等の盛土等に有効利用することが可能である。 Table 5 shows the cone index of the mixed soil obtained in Example 2. These numerical values correspond to the second type improved soil according to the above soil classification criteria, and therefore, the modified recycled soil can be effectively used for embankments such as river embankments in terms of strength.
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| JPH11343633A (en) * | 1998-02-13 | 1999-12-14 | Mitsubishi Heavy Ind Ltd | Produced soil processing device, construction material forming method, construction material, and granulation agent |
| JPH11315554A (en) * | 1998-03-02 | 1999-11-16 | Mitsubishi Heavy Ind Ltd | Device and method of treating generated soil |
| JP2001182095A (en) * | 1999-12-28 | 2001-07-03 | Nittodaito Construction Co Ltd | Flowability improved soil, and method and device for producing the improved soil |
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