JP2005344031A - Soil improving material - Google Patents

Soil improving material Download PDF

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JP2005344031A
JP2005344031A JP2004166537A JP2004166537A JP2005344031A JP 2005344031 A JP2005344031 A JP 2005344031A JP 2004166537 A JP2004166537 A JP 2004166537A JP 2004166537 A JP2004166537 A JP 2004166537A JP 2005344031 A JP2005344031 A JP 2005344031A
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soil
paper
sludge
cement
present
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JP4584630B2 (en
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Nobukazu Futado
信和 二戸
Kiyoshi Koibuchi
清 鯉渕
Shoichi Suzuki
章市 鈴木
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DC Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Treatment Of Sludge (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To more economically provide a soil improving material which is used in the field of recycling the soil produced in a construction side and sludge and exhibits a low strength and not too high a pH. <P>SOLUTION: The soil improving material comprises 15-60 wt.% paper sludge containing soluble silica and calcium or ashes made by burning a tree, charcoal, paper, straw, chaff or vegetation, 20-60 wt.% portland cement, 10-40 wt.% iron-blast-furnace slag fine powder, and 0-10 wt.% gypsum. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、建設発生土および汚泥の再利用の分野で使用される土質改良材に関するものである。   The present invention relates to a soil conditioner used in the field of construction generated soil and sludge recycling.

従来から軟弱地盤の改良としてセメントを主成分としてスラグ、フライアッシュ等のポラゾン材、アルミナセメント、ジェットセメント等の特殊な成分の強度増進材、石膏、硫酸ソーダ等のセメント水和の刺激材等で構成されるセメント系固化材が使用されている。 セメント系固化材は（イ）エトリンガイトの生成により結合水として取り込まれ土の含水比が低下する。（ロ）セメント系固化材から溶出したカルシウムイオンによって土粒子が凝集、団粒化され砂質土に近い性状となる。（ハ）セメントの水和によってケイ酸カルシウム水和物の生成により強度が上昇する。（ニ）長期材齢では土粒子とセメント水和によって生成した水酸化カルシウムとポラゾン反応で強度増進する。
特開２００２−２０５０４１ Conventional improvement of soft ground with cement as the main component, slag, fly ash and other porazone materials, alumina cement, strength enhancing materials such as jet cement, cement hydration stimulating materials such as gypsum and sodium sulfate, etc. Constructed cement-based solidification material is used. The cement-based solidified material is taken up as bound water by the formation of (i) ettringite, and the moisture content of the soil decreases. (B) The soil particles are aggregated and agglomerated by calcium ions eluted from the cement-based solidified material, resulting in properties close to sandy soil. (C) Strength increases due to the formation of calcium silicate hydrate by hydration of the cement. (D) In long-term ages, the strength is enhanced by the reaction of calcium hydroxide generated by hydration of soil particles and cement and the polazone.
JP2002-205041

近年、建設工事に伴って莫大な量の建設発生土および汚泥が搬出され、その処分地の確保が困難となりつつあり、建設発生土および汚泥の再利用が望まれている。しかし、建設発生土および汚泥の一部には含水比が高く汚泥状のものがあり、再利用のためにはダンプトラックに山積みが可能で、かつ人が歩行可能な程度の状態に改良する必要がある。また、改良した土は、圧密が可能で、かつ地下水を汚染することなく、植物が容易に育成できるように、できるだけＰＨが低いことが要求される。
一方、従来のセメント系固化材による改良では、ハンドリング性状が良好となる程度に改良すると上述した反応によって過剰な強度が発現するという問題があった。また、セメント系固化材で改良した土は添加量にもよるがＰＨが高くなり過ぎるという欠点があった。 In recent years, enormous amounts of construction-generated soil and sludge are carried out with construction work, and it is becoming difficult to secure the disposal site, and it is desired to reuse the construction-generated soil and sludge. However, some of the generated soil and sludge have a high water content and are sludge-like. For reuse, it is necessary to improve the dump truck so that it can be stacked and walked by people. There is. In addition, the improved soil is required to have as low a pH as possible so that it can be consolidated and plants can be easily grown without contaminating the groundwater.
On the other hand, in the improvement by the conventional cement-based solidifying material, there is a problem that if the handling property is improved to an extent that the handling property is good, the above-described reaction causes an excessive strength. In addition, the soil improved with the cement-based solidifying material has a drawback that the pH becomes too high depending on the amount of addition.

したがって、本発明の目的は、建設発生土および汚泥の再利用の分野で使用される低強度で、かつＰＨが高くなり過ぎない土質改良材をより経済的に提供することにある。   Accordingly, an object of the present invention is to more economically provide a soil improvement material which is used in the field of construction generated soil and sludge recycling and has a low strength and does not have an excessively high PH.

本発明者らは、これまで研究がなされてこなかったペーパスラッジ、木、木炭、紙、藁、籾殻及び草木の焼却灰からなる土質改良材に着目し、鋭意研究し、この土質改良材は建設発生土および汚泥の含水比の低下と低強度の改良に効果があることを見出し、本発明を完成するに至った。
すなわち、上記本発明の目的を達成するために、請求項１に記載の通り、ペーパスラッジ若しくは木、木炭、紙、藁、籾殻及び草木の焼却灰を１５重量％から６０重量％、ポルトランドセメントを２０重量％から６０重量％、高炉スラグ微粉末を１０重量％から４０重量％、石膏を０重量％から１０重量％からなることを特徴とするものである。
また、請求項２に記載の通り、上記ペーパスラッジ若しくは木、木炭、紙、藁、籾殻及び草木の焼却灰は８００℃における強熱減量が３％未満であることを特徴とするものである。 The inventors of the present invention have paid attention to a soil improvement material composed of incinerated ash, which has not been studied so far, such as paper sludge, wood, charcoal, paper, straw, rice husk and grass. It has been found that there is an effect in reducing the moisture content of the generated soil and sludge and improving the low strength, and the present invention has been completed.
That is, in order to achieve the object of the present invention, as described in claim 1, 15 to 60% by weight of paper sludge or incinerated ash of wood, charcoal, paper, straw, rice husk and vegetation, and Portland cement It consists of 20 to 60% by weight, blast furnace slag fine powder from 10 to 40% by weight, and gypsum from 0 to 10% by weight.
Further, as described in claim 2, the paper sludge or the incinerated ash of wood, charcoal, paper, firewood, rice husks and vegetation has an ignition loss at 800 ° C. of less than 3%.

本発明によれば、建設発生土および汚泥の含水比の低下と低強度の改良に効果があり、建設発生土および汚泥の再利用が可能となる。本発明はペーパスラッジ、木、木炭、紙、藁、籾殻及び草木の焼却灰が使用されていることから産業廃棄物の有効利用に貢献すると共に、これらの焼却灰は可溶性のシリカとカルシウムを含有しているため肥料としての効果も大いに期待できる。   ADVANTAGE OF THE INVENTION According to this invention, it is effective in the fall of the moisture content ratio of construction generation soil and sludge, and improvement of low intensity | strength, and reuse of construction generation soil and sludge is attained. The present invention contributes to the effective use of industrial waste because of the use of paper sludge, wood, charcoal, paper, firewood, rice husk and vegetation incineration ash, and these incineration ash contains soluble silica and calcium. Therefore, the effect as a fertilizer can be greatly expected.

本発明に使用するペーパスラッジ、木、木炭、紙、藁、籾殻及び草木の焼却灰は、８００℃における強熱減量が３％未満であることを特徴とする。３％以上ではペーパスラッジ、木、木炭、紙、藁、籾殻及び草木が不完全燃焼の恐れがあり使用できない。   The incinerated ash used in the present invention is characterized in that the loss on ignition at 800 ° C. is less than 3% in the incinerated ash of paper sludge, wood, charcoal, paper, straw, rice husk and vegetation. If it is 3% or more, paper sludge, wood, charcoal, paper, straw, rice husk and vegetation may be incompletely burned and cannot be used.

本発明の土質改良材は、ペーパスラッジ、木、木炭、紙、藁、籾殻及び草木の焼却灰を１５重量％から６０重量％であることを特徴とする。これらの焼却灰自体に吸水効果があり、本発明の土質改良材の改良効果は固化改良だけではなく、前記吸水効果の物理的効果によることを特徴とする。従って、建設発生土および汚泥の含水比の低下に有効である。上述の焼却灰の割合が１５重量％を下回ると、その他の材料の割合が相対的に増加し、吸水効果による改良効果が小さくなる。また、上述の焼却灰の割合が６０重量％を上回ると強度発現効果が小さくなる。   The soil improvement material of the present invention is characterized by containing 15% to 60% by weight of incinerated ash of paper sludge, wood, charcoal, paper, straw, rice husk and vegetation. These incineration ash itself has a water absorption effect, and the improvement effect of the soil improvement material of the present invention is characterized by not only the solidification improvement but also the physical effect of the water absorption effect. Therefore, it is effective in reducing the moisture content of construction generated soil and sludge. When the ratio of the incinerated ash is less than 15% by weight, the ratio of other materials is relatively increased, and the improvement effect due to the water absorption effect is reduced. Moreover, when the ratio of the above-mentioned incineration ash exceeds 60% by weight, the strength development effect becomes small.

本発明の土質改良材は、セメントが２０重量％から６０重量％であることを特徴とする。６０重量％を超えると、強度発現が過剰になると共に改良土のＰＨが高くなり過ぎる。また、２０重量％下回ると強度発現効果が小さくなるので好ましくない。
ポルトランドセメントには早強、普通、中庸熱、低熱、エコセメントがあるが、本発明では何れのポルトランドセメントも使用することができる。 The soil improvement material of the present invention is characterized in that cement is 20 wt% to 60 wt%. When it exceeds 60% by weight, the strength expression becomes excessive and the pH of the improved soil becomes too high. On the other hand, if it is less than 20% by weight, the strength development effect becomes small, which is not preferable.
Portland cement includes early strength, normal, moderate heat, low heat, and eco-cement, but any Portland cement can be used in the present invention.

本発明の土質改良材は、高炉スラグ微粉末が１０重量％から４０重量％であることを特徴とする。高炉スラグ微粉末の重量％を１０重量％から４０重量％と限定した理由は、改良の対象となる土の種類によって改良効果が異なるためである。すなわち、有機質を含む腐植土の場合には高炉スラグ微粉末による改良効果が大きいが、シルト質や関東ロームには改良効果が小さいことによる。
本発明において、高炉スラグ微粉末の粉末度は特に限定しないが、ブレーン比表面積で４０００から６０００ｃｍ２／ｇが望ましい。 The soil improvement material of the present invention is characterized in that the blast furnace slag fine powder is 10 wt% to 40 wt%. The reason why the weight percent of the blast furnace slag fine powder is limited to 10 wt% to 40 wt% is that the improvement effect varies depending on the type of soil to be improved. That is, in the case of humus containing organic matter, the improvement effect by blast furnace slag fine powder is large, but the improvement effect is small in silty and Kanto loam.
In the present invention, the fineness of the blast furnace slag fine powder is not particularly limited, but is preferably 4000 to 6000 cm 2 / g in terms of Blaine specific surface area.

石膏には、天然無水石膏、フッ酸無水石膏、天然２水石膏や副産２水石膏あるいは廃石膏ボードから回収した２水石膏、また、これらの２水石膏を焼成して製造した無水石膏があるが、本発明では、ＳＯ３量が４０％以上含有している石膏であれば、すべて使用できる。また、その粉末度は特に限定しないが、ブレーン比表面積で３０００から８０００ｃｍ２／ｇ、好ましくは４０００から６０００ｃｍ２／ｇである。 Gypsum includes natural anhydrous gypsum, hydrofluoric acid anhydrous gypsum, natural dihydrate gypsum, byproduct dihydrate gypsum, dihydrate gypsum recovered from waste gypsum board, and anhydrous gypsum produced by firing these dihydrate gypsum. However, in the present invention, any gypsum containing 40% or more of SO3 can be used. Further, the fineness is not particularly limited, 8000 cm 2 / g, from 3000 Blaine specific surface area is preferably from 4000 6000cm 2 / g.

石膏を０重量％から１０重量％に限定した理由は、石膏が多いとエトリンガイドの生成量が増加し、初期の強度発現が過剰になるからである。また、砂質土のように改良の対象となる土の種類によっては、石膏による改良効果があまり無い場合があるからである。   The reason for limiting the amount of gypsum to 0 to 10% by weight is that if there is a large amount of gypsum, the amount of ethrin guide produced increases and the initial strength expression becomes excessive. Further, depending on the type of soil to be improved, such as sandy soil, there is a case where there is not much improvement effect by gypsum.

以下から実施例の説明入るが、本発明の土質改良材とセメント系固化材の配合を図１の表１に示す。実施例に用いた高炉スラグ微粉末および天然無水石膏の粉末度は、ブレーン比表面積で４５００および４２００ｃｍ２／ｇである。また、セメントは普通ポルトランドセメントである。この表１中の記号Ｃ、Ｄ、Ｅに示す改良材は市販のセメント系固化材に相当する配合である。 Examples will be described below. Table 1 in FIG. 1 shows the composition of the soil conditioner and cement-based solidifying material of the present invention. The fineness of the blast furnace slag fine powder and natural anhydrous gypsum used in the examples is 4500 and 4200 cm 2 / g in terms of Blaine specific surface area. The cement is usually Portland cement. The improved materials indicated by symbols C, D, and E in Table 1 are blends corresponding to commercially available cementitious solidifying materials.

ペーパスラッジ焼却灰の化学成分を図２の表２で示す。この表２の結果によりペーパスラッジ焼却灰の８００℃における強熱減量は１．５％であった。すなわち、本発明の請求項２を満たす焼却灰である。   The chemical composition of the paper sludge incineration ash is shown in Table 2 of FIG. As a result of Table 2, the loss on ignition of the paper sludge incinerated ash at 800 ° C. was 1.5%. That is, the incinerated ash satisfies claim 2 of the present invention.

本発明の土質改良材とセメント系固化材による改良土の一軸圧縮強度の結果を図３の表３に示す。実施した試料土の種類、湿潤密度、含水比を合わせて表３に記載した。   Table 3 in FIG. 3 shows the results of the uniaxial compressive strength of the improved soil by the soil improvement material and the cement-based solidifying material of the present invention. The type of sample soil, the wet density, and the water content ratio are shown in Table 3.

この表３の結果により、本発明の土質改良材はセメント系固化材と比較して試料土の種類にかかわらず強度発現が抑えられた。   As a result of Table 3, the soil quality improving material of the present invention was suppressed in strength development regardless of the type of the sample soil as compared with the cement-based solidified material.

細骨材の製造時に発生した脱水ケーキを本発明の土質改良材で改良した例を図４の表４に示す。   Table 4 in FIG. 4 shows an example in which the dewatered cake generated during the production of fine aggregate is improved with the soil improvement material of the present invention.

この表４の結果により、本発明の土質改良材の添加量が５％を超えると強度が過剰となり、５％程度が適切であった。また、ペーパスラッジ焼却灰のみの改良では、含水比が減少したが強度発現はしなかった。   From the results shown in Table 4, when the amount of the soil improvement material of the present invention exceeds 5%, the strength becomes excessive and about 5% is appropriate. In addition, improvement with only paper sludge incineration ash reduced the water content but did not develop strength.

本発明の土質改良材とセメントによる改良土のＰＨの結果を図５の表５に示す。この実施例に用いた試料土は、火山灰質粘性土、湿潤密度１４６４Ｋｇ／ｍ３、含水比９１．８％である。 Table 5 in FIG. 5 shows the PH results of the improved soil and the soil improved material according to the present invention. The sample soil used in this example is a volcanic ash clay, a wet density of 1464 Kg / m 3 , and a water content ratio of 91.8%.

この表５の結果により、本発明の土質改良材による改良土のＰＨは普通ポルトランドセメントによる改良土のＰＨと比較して１程度減少した。   As a result of Table 5, the pH of the improved soil by the soil improvement material of the present invention was reduced by about 1 compared with the PH of the improved soil by ordinary Portland cement.

尚、上記実施形態ではペーパスラッジ焼却灰で説明したが、ペーパスラッジ焼却灰に代えて木、木炭、紙、藁、籾殻及び草木の焼却灰を使用しても本発明の目的を達成することができる。   Although the paper sludge incineration ash has been described in the above embodiment, the object of the present invention can be achieved even by using wood, charcoal, paper, straw, rice husk, and plant incineration ash instead of paper sludge incineration ash. it can.

本発明の土質改良材とセメント系固化材の配合を示す図表Chart showing the composition of soil improvement material and cement-based solidification material of the present invention ペーパスラッジ焼却灰の化学成分を示す図表Chart showing chemical composition of paper sludge incineration ash 土質改良材とセメント系固化材による改良土の一軸圧縮強度の結果を示す図表Chart showing the results of uniaxial compressive strength of soil improved by soil improvement material and cement-based solidification material 細骨材の製造時に発生した脱水ケーキを本発明の土質改良材で改良した例を示す図表Chart showing examples of dewatering cake generated during the production of fine aggregates improved with the soil conditioner of the present invention 本発明の土質改良材とセメントによる改良土のＰＨの結果を示す図表The chart which shows the result of PH of the improvement soil with the soil improvement material and cement of this invention

Claims (2)

ペーパスラッジ若しくは木、木炭、紙、藁、籾殻及び草木の焼却灰を１５重量％から６０重量％、ポルトランドセメントを２０重量％から６０重量％、高炉スラグ微粉末を１０重量％から４０重量％、石膏を０重量％から１０重量％からなることを特徴とする土質改良材。   15 to 60% by weight of paper sludge or wood, charcoal, paper, firewood, chaff and vegetation incineration ash, 20 to 60% by weight of Portland cement, 10 to 40% by weight of blast furnace slag fine powder, A soil improvement material comprising 0 to 10% by weight of gypsum. ペーパスラッジ若しくは木、木炭、紙、藁、籾殻及び草木の焼却灰は８００℃における強熱減量が３％未満であることを特徴とする請求項１に記載の土質改良材。   2. The soil improvement material according to claim 1, wherein the incinerated ash of paper sludge or wood, charcoal, paper, straw, rice husk and vegetation has an ignition loss at 800 ° C. of less than 3%.
JP2004166537A 2004-06-04 2004-06-04 Soil improvement material Expired - Lifetime JP4584630B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007314661A (en) * 2006-05-25 2007-12-06 Ube Ind Ltd Cement-based setting material and setting treatment method
JP2013064052A (en) * 2011-09-16 2013-04-11 Dc Co Ltd Soil conditioner
JP2018024767A (en) * 2016-08-10 2018-02-15 株式会社ダイセキ環境ソリューション Waste composition for soil modification and ground improving material using the same
CN115124382A (en) * 2022-06-17 2022-09-30 山东省葡萄研究院 Preparation method and application of inorganic fertilizer for grape planting

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11319894A (en) * 1998-05-18 1999-11-24 Denki Kagaku Kogyo Kk Solidifier for sludge, molded part using this and solidification process thereof
JP2002088362A (en) * 2000-09-14 2002-03-27 Sueo Wada Setting agent for soil
JP2004067399A (en) * 2002-08-01 2004-03-04 Kochi Recycle Center:Kk Method of producing regenerated sand from construction sludge
JP2005336232A (en) * 2004-05-24 2005-12-08 Shokudai Hanbai Kk Soil solidification agent

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11319894A (en) * 1998-05-18 1999-11-24 Denki Kagaku Kogyo Kk Solidifier for sludge, molded part using this and solidification process thereof
JP2002088362A (en) * 2000-09-14 2002-03-27 Sueo Wada Setting agent for soil
JP2004067399A (en) * 2002-08-01 2004-03-04 Kochi Recycle Center:Kk Method of producing regenerated sand from construction sludge
JP2005336232A (en) * 2004-05-24 2005-12-08 Shokudai Hanbai Kk Soil solidification agent

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007314661A (en) * 2006-05-25 2007-12-06 Ube Ind Ltd Cement-based setting material and setting treatment method
JP2013064052A (en) * 2011-09-16 2013-04-11 Dc Co Ltd Soil conditioner
JP2018024767A (en) * 2016-08-10 2018-02-15 株式会社ダイセキ環境ソリューション Waste composition for soil modification and ground improving material using the same
CN115124382A (en) * 2022-06-17 2022-09-30 山东省葡萄研究院 Preparation method and application of inorganic fertilizer for grape planting

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