JP7105595B2 - Method for producing additive material for soil granulation and method for modifying soil - Google Patents

Method for producing additive material for soil granulation and method for modifying soil Download PDF

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JP7105595B2
JP7105595B2 JP2018070427A JP2018070427A JP7105595B2 JP 7105595 B2 JP7105595 B2 JP 7105595B2 JP 2018070427 A JP2018070427 A JP 2018070427A JP 2018070427 A JP2018070427 A JP 2018070427A JP 7105595 B2 JP7105595 B2 JP 7105595B2
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soil
additive
granulation
polymer flocculant
nonionic polymer
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JP2019182884A (en
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喜彦 森
康秀 肥後
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Taiheiyo Cement Corp
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Description

本発明は、土壌造粒用添加材及びそれを用いた土壌の改質方法に関する。 TECHNICAL FIELD The present invention relates to an additive for soil granulation and a method for modifying soil using the same.

建設汚泥や軟弱土壌等の高含水土壌に対して、運搬や再利用等の際の取り扱いを容易にする目的で、固化材を用いて固化処理を行うことがある。
このような固化材として、例えば、特許文献1に、(A)合成水溶性高分子(例えば、アニオン性ポリアクリルアミド)と天然水溶性高分子との混合物が0.2~10重量部、(B)無機物粉末および/または有機物粉末が0.2~20重量部、および(C)無機系固化剤が10~200重量部、からなる残土固化処理剤が、記載されている。
Construction sludge, soft soil, and other highly water-containing soils are often solidified using a solidification agent for the purpose of facilitating handling during transportation and reuse.
As such a solidifying material, for example, in Patent Document 1, (A) a mixture of a synthetic water-soluble polymer (eg, anionic polyacrylamide) and a natural water-soluble polymer is 0.2 to 10 parts by weight, (B ) 0.2 to 20 parts by weight of inorganic powder and/or organic powder, and (C) 10 to 200 parts by weight of inorganic solidifying agent.

特開平8-333571号公報JP-A-8-333571

本発明の目的は、建設汚泥や軟弱土壌等の高含水土壌を造粒して、土壌造粒物を調製するための土壌造粒用添加材であって、土壌造粒物の運搬や再利用等の際の取り扱いが容易であり、かつ、土壌造粒物のpHを、環境基準値である5.8~8.6の範囲内に収めることのできる土壌造粒用添加材を提供することである。 The object of the present invention is to provide a soil granulation additive for preparing soil granules by granulating high water content soil such as construction sludge and soft soil, and transporting and reusing the soil granules. To provide an additive for soil granulation, which is easy to handle at the time of, etc., and can keep the pH of the soil granulation within the range of 5.8 to 8.6, which is the environmental standard value. is.

本発明者らは、上記課題を解決するために鋭意検討した結果、90%重量累積粒径が400μm以下であるノニオン性高分子凝集剤を含む土壌造粒用添加材によれば、上記目的を達成できることを見出し、本発明を完成した。
本発明は、以下の[1]~[5]を提供するものである。
[1] 90%重量累積粒径が400μm以下であるノニオン性高分子凝集剤を含むことを特徴とする土壌造粒用添加材。
[2] 上記ノニオン性高分子凝集剤が、ポリアクリルアミド系高分子凝集剤である、上記[1]に記載の土壌造粒用添加材。
[3] 上記[1]又は[2]に記載の土壌造粒用添加材を製造するための方法であって、90%重量累積粒径が400μmを超えるノニオン性高分子凝集剤を粉砕して、上記90%重量累積粒径が400μm以下であるノニオン性高分子凝集剤を得る粉砕工程を含むことを特徴とする土壌造粒用添加材の製造方法。
[4] 上記[1]又は[2]に記載の土壌造粒用添加材を、処理対象物である土壌に添加して混合し、上記土壌が造粒されてなる改質された土壌を得る添加材添加工程、を含むことを特徴とする土壌の改質方法。
[5] 上記添加材添加工程の後に、上記改質された土壌を、目開き寸法が8~60mmの篩を用いて、篩分けして、上記篩を通過する細粒分の割合を求める篩分け工程、及び、上記篩分け工程で得た細粒分の割合の適否を評価して、上記土壌造粒用添加材を構成する成分組成を調整する成分組成調整工程、を含む、上記[4]に記載の土壌の改質方法。
The present inventors have made intensive studies to solve the above problems, and as a result, according to a soil granulation additive containing a nonionic polymer flocculant having a 90% weight cumulative particle size of 400 μm or less, the above objects can be achieved. I found that it can be achieved, and completed the present invention.
The present invention provides the following [1] to [5].
[1] An additive for soil granulation, comprising a nonionic polymer flocculant having a 90% weight cumulative particle size of 400 µm or less.
[2] The additive for soil granulation according to [1] above, wherein the nonionic polymer flocculant is a polyacrylamide-based polymer flocculant.
[3] A method for producing the soil granulation additive according to [1] or [2] above, comprising pulverizing a nonionic polymer flocculant having a 90% weight cumulative particle size exceeding 400 μm A method for producing an additive for soil granulation, comprising a pulverization step of obtaining the nonionic polymer flocculant having a 90% weight cumulative particle size of 400 μm or less.
[4] The soil granulation additive according to [1] or [2] is added to and mixed with the soil to be treated, and the soil is granulated to obtain improved soil. A method for modifying soil, comprising: an additive addition step.
[5] After the additive addition step, the modified soil is sieved using a sieve with an opening size of 8 to 60 mm to determine the ratio of fine particles that pass through the sieve. The above [4 ] The soil improvement method as described in .

本発明の土壌造粒用添加材によれば、建設汚泥や軟弱土壌等の高含水土壌を造粒して、物理的及び化学的特性に優れた土壌造粒物を調製することができる。
調製された土壌造粒物は、互いに付着しにくく、かつ、硬さが大きいため、運搬や再利用等の際の取り扱いが容易である。
また、土壌造粒物は、そのpHが、環境基準値である5.8~8.6の範囲内に収まるものである。
According to the additive for soil granulation of the present invention, it is possible to granulate highly water-containing soil such as construction sludge and soft soil to prepare soil granules having excellent physical and chemical properties.
The prepared soil granules are less likely to adhere to each other and have high hardness, so that they are easy to handle during transportation, reuse, and the like.
Further, the soil granules have a pH within the environmental standard value range of 5.8 to 8.6.

本発明の土壌造粒用添加材は、90%重量累積粒径が400μm以下であるノニオン性高分子凝集剤を含むものである。
このノニオン性高分子凝集剤について、以下、詳しく説明する。
[ノニオン性高分子凝集剤]
ノニオン性高分子凝集剤の例としては、ポリアクリルアミド系の高分子凝集剤等が挙げられる。
ノニオン性高分子凝集剤は、ノニオン性モノマーを重合させることによって得ることができる。ノニオン性モノマーの例としては、(メタ)アクリルアミド、N,N-ジメチル(メタ)アクリルアミド等が挙げられる。これらのモノマーは、1種を単独でまたは2種以上を組み合わせて用いることができる。
The additive for soil granulation of the present invention contains a nonionic polymer flocculant having a 90% weight cumulative particle size of 400 μm or less.
This nonionic polymer flocculant will be described in detail below.
[Nonionic polymer flocculant]
Examples of nonionic polymer flocculants include polyacrylamide-based polymer flocculants.
A nonionic polymer flocculant can be obtained by polymerizing a nonionic monomer. Examples of nonionic monomers include (meth)acrylamide, N,N-dimethyl(meth)acrylamide and the like. These monomers can be used singly or in combination of two or more.

ノニオン性高分子凝集剤の90%重量累積粒径は、土壌造粒物同士の付着がなく、取り扱い易いこと(本明細書中、「造粒物の独立性」ともいう。)や、土壌造粒物の硬さの程度が大きく、再利用等においても取り扱い易いこと(本明細書中、「造粒物の硬さ特性」ともいう。)の観点から、400μm以下、好ましくは350μm以下、より好ましくは300μm以下、さらに好ましくは250μm以下、さらに好ましくは200μm以下、特に好ましくは180μm以下である。
該90%重量累積粒径の下限値は、特に限定されないが、粉砕に要する手間及び時間の観点から、好ましくは70μm以上、より好ましくは100μm以上である。
ここで、90%重量累積粒径とは、粒径の小さな粒子から順に累積させていった場合における、粒子全体の90質量%に達したときの粒径をいう。
The 90% weight cumulative particle size of the nonionic polymer flocculant is easy to handle without adhesion of soil granules (also referred to as “independence of granules” in this specification), and From the viewpoint that the granules have a high degree of hardness and are easy to handle even when reused (also referred to in this specification as "hardness characteristics of granules"), 400 μm or less, preferably 350 μm or less, and more It is preferably 300 μm or less, more preferably 250 μm or less, still more preferably 200 μm or less, and particularly preferably 180 μm or less.
Although the lower limit of the 90% weight cumulative particle size is not particularly limited, it is preferably 70 μm or more, more preferably 100 μm or more, from the viewpoint of the labor and time required for pulverization.
Here, the 90% weight cumulative particle size refers to the particle size when 90% by mass of the entire particles are accumulated when the particles are accumulated in order from the smallest particle size.

ノニオン性高分子凝集剤の50%重量累積粒径は、300μm以下、好ましくは250μm以下、より好ましくは200μm以下、さらに好ましくは150μm以下、特に好ましくは100μm以下である。
該50%重量累積粒径の下限値は、特に限定されないが、粉砕に要する手間及び時間の観点から、好ましくは40μm以上、より好ましくは70μm以上である。
ノニオン性高分子凝集剤のアニオン度は、好ましくは4以下、より好ましくは3以下、さらに好ましくは2以下、さらに好ましくは1以下、特に好ましくは0である。
The 50% weight cumulative particle size of the nonionic polymer flocculant is 300 μm or less, preferably 250 μm or less, more preferably 200 μm or less, even more preferably 150 μm or less, and particularly preferably 100 μm or less.
Although the lower limit of the 50% weight cumulative particle size is not particularly limited, it is preferably 40 μm or more, more preferably 70 μm or more, from the viewpoint of the labor and time required for pulverization.
The degree of anion of the nonionic polymer flocculant is preferably 4 or less, more preferably 3 or less, still more preferably 2 or less, still more preferably 1 or less, and particularly preferably 0.

[無機系材料]
本発明の土壌造粒用添加材は、無機系材料を含むことができる。
無機系材料の例としては、炭酸カルシウム粉末(工業製品)、石灰石粉末、半水石膏、無水石膏、ゼオライト、活性白土、ベントナイト、珪石粉末、石炭灰、頁岩粉末、セピオライト、活性炭、珪藻土、ドロマイト等が挙げられる。
これらは、一種を単独でまたは二種以上を組み合わせて用いることができる。
無機系材料の配合量は、無機系材料の種類や造粒対象土壌の種類(性状)によっても異なるが、ノニオン性高分子凝集剤100質量部に対して、好ましくは50~30,000質量部、より好ましくは200~25,000質量部、特に好ましくは500~20,000質量部である。
該量が50質量部以上であると、無機系材料の種類に応じた各種の効果(例えば、pHの調整や、硬化時間の調整や、保水性の付与等)を十分に与えることができる。該量が30,000質量部以下であると、土壌造粒用添加材中のノニオン性高分子凝集剤の割合が小さいことによる本発明の効果(例えば、造粒物の独立性や硬さ特性の向上)の低下を避けることができる。
無機系材料のブレーン比表面積は、好ましくは2,000~10,000cm/g、より好ましくは3,000~9,000cm/gである。
本明細書中、ブレーン比表面積は、「JIS R 5201:2015」(セメントの物理試験方法)に準拠して測定された値である。
[Inorganic materials]
The soil granulation additive of the present invention can contain an inorganic material.
Examples of inorganic materials include calcium carbonate powder (industrial product), limestone powder, hemihydrate gypsum, anhydrite, zeolite, activated clay, bentonite, silica powder, coal ash, shale powder, sepiolite, activated carbon, diatomaceous earth, dolomite, etc. is mentioned.
These can be used individually by 1 type or in combination of 2 or more types.
The amount of the inorganic material to be blended varies depending on the type of inorganic material and the type (property) of the soil to be granulated, but is preferably 50 to 30,000 parts by mass with respect to 100 parts by mass of the nonionic polymer flocculant. , more preferably 200 to 25,000 parts by mass, particularly preferably 500 to 20,000 parts by mass.
When the amount is 50 parts by mass or more, various effects (for example, adjustment of pH, adjustment of curing time, provision of water retentivity, etc.) according to the type of inorganic material can be sufficiently imparted. When the amount is 30,000 parts by mass or less, the effects of the present invention due to the small proportion of the nonionic polymer flocculant in the soil granulation additive (for example, the independence and hardness characteristics of the granules improvement) can be avoided.
The Blaine specific surface area of the inorganic material is preferably 2,000 to 10,000 cm 2 /g, more preferably 3,000 to 9,000 cm 2 /g.
In the present specification, the Blaine specific surface area is a value measured according to "JIS R 5201:2015" (physical test method for cement).

[増粘用材料]
本発明の土壌造粒用添加材は、増粘用材料を含むことができる。
増粘用材料の例としては、天然材料に由来する増粘多糖類(例えば、グアガム等)や、セルロース系増粘剤(例えば、メチルセルロース)等が挙げられる。
これら(例えば、グアガム、メチルセルロース等)は、一種を単独でまたは二種以上を組み合わせて用いることができる。
増粘用材料の配合量は、増粘用材料の種類や造粒対象土壌の種類によっても異なるが、ノニオン性高分子凝集剤100質量部に対して、好ましくは1~3,000質量部、より好ましくは2~2,500質量部、特に好ましくは3~2,000質量部である。
該量が1質量部以上であると、増粘用材料による効果(土壌造粒用添加材を構成する各材料間の付着性の向上)を高めることができる。該量が3,000質量部以下であると、土壌造粒用添加材中のノニオン性高分子凝集剤の割合が小さいことによる本発明の効果(例えば、造粒物の独立性や硬さ特性の向上)の低下を避けることができる。
増粘用材料の粘度は、大きいことが望ましいが、市販品の入手容易性等の観点からは、好ましくは3,000~25,000mPa・s、より好ましくは5,000~20,000mPa・sである。
本明細書中、増粘用材料の粘度とは、増粘用材料を1質量%の濃度になるように液温20℃の水に溶解させて水溶液を調製した場合における、溶解から1時間経過時の粘度をいう。
[Thickening material]
The soil granulation additive of the present invention can contain a thickening material.
Examples of thickening materials include thickening polysaccharides derived from natural materials (eg, guar gum), cellulose-based thickeners (eg, methylcellulose), and the like.
These (eg, guar gum, methylcellulose, etc.) can be used singly or in combination of two or more.
Although the amount of the thickening material varies depending on the type of thickening material and the type of soil to be granulated, it is preferably 1 to 3,000 parts by mass with respect to 100 parts by mass of the nonionic polymer flocculant. More preferably 2 to 2,500 parts by mass, particularly preferably 3 to 2,000 parts by mass.
When the amount is 1 part by mass or more, the effect of the thickening material (improved adhesion between each material constituting the additive for soil granulation) can be enhanced. When the amount is 3,000 parts by mass or less, the effects of the present invention due to the small proportion of the nonionic polymer flocculant in the additive for soil granulation (e.g., independence and hardness characteristics of granules improvement) can be avoided.
The viscosity of the thickening material is desirably high, but from the viewpoint of availability of commercial products, it is preferably 3,000 to 25,000 mPa s, more preferably 5,000 to 20,000 mPa s. is.
In this specification, the viscosity of the thickening material refers to the case where an aqueous solution is prepared by dissolving the thickening material in water at a liquid temperature of 20 ° C. to a concentration of 1% by mass, and 1 hour after dissolution Viscosity at time.

[強度促進材]
本発明の土壌造粒用添加材は、強度促進材を含むことができる。
強度促進材の例としては、各種のセメント(例えば、普通ポルトランドセメント、早強ポルトランドセメント等)、生石灰、消石灰、酸化マグネシウム粉末、高炉スラグ粉末等が挙げられる。
これらは、一種を単独でまたは二種以上を組み合わせて用いることができる。
強度促進材の配合量は、強度促進材の種類や造粒対象土壌の種類によっても異なるが、ノニオン性高分子凝集剤100質量部に対して、好ましくは10~3,000質量部、より好ましくは30~2,000質量部、特に好ましくは50~1,500質量部である。
該量が10質量部以上であると、土壌造粒物の強度(例えば、一軸圧縮強さ)を高めることができる。該量が3,000質量部以下であると、土壌造粒用添加材中のノニオン性高分子凝集剤の割合が小さいことによる本発明の効果(例えば、造粒物の独立性や硬さ特性の向上)の低下を避けることができる。
強度促進材のブレーン比表面積は、好ましくは2,000~10,000cm/g、より好ましくは3,000~9,000cm/gである。
[Strength promoting material]
The soil granulation additive of the present invention can contain a strength enhancer.
Examples of strength accelerators include various cements (eg, ordinary Portland cement, high-early-strength Portland cement, etc.), quicklime, slaked lime, magnesium oxide powder, blast furnace slag powder, and the like.
These can be used individually by 1 type or in combination of 2 or more types.
Although the amount of the strength-enhancing agent to be blended varies depending on the type of strength-enhancing agent and the type of soil to be granulated, it is preferably 10 to 3,000 parts by mass, more preferably 10 to 3,000 parts by mass with respect to 100 parts by mass of the nonionic polymer flocculant. is 30 to 2,000 parts by weight, particularly preferably 50 to 1,500 parts by weight.
When the amount is 10 parts by mass or more, the strength (for example, unconfined compression strength) of the soil granules can be increased. When the amount is 3,000 parts by mass or less, the effects of the present invention due to the small proportion of the nonionic polymer flocculant in the additive for soil granulation (e.g., independence and hardness characteristics of granules improvement) can be avoided.
The Blaine specific surface area of the strength enhancer is preferably 2,000 to 10,000 cm 2 /g, more preferably 3,000 to 9,000 cm 2 /g.

[土壌造粒用添加材]
本発明の土壌造粒用添加材の好ましい実施形態例の一つとして、上述のノニオン性高分子凝集剤のみからなるものが挙げられる。
また、本発明の土壌造粒用添加材の好ましい実施形態例の他の例として、上述のノニオン性高分子凝集剤に加えて、上述の無機系材料、増粘用材料、及び強度促進材の中から選ばれる一種または二種以上を含むものが挙げられる。
土壌造粒用添加材の製造方法の一例として、90%重量累積粒径が400μmを超えるノニオン性高分子凝集剤を粉砕して、90%重量累積粒径が400μm以下であるノニオン性高分子凝集剤を得る粉砕工程を含むものが挙げられる。
ここで、90%重量累積粒径が400μmを超えるノニオン性高分子凝集剤の市販品の例としては、90%重量累積粒径が800~1,200μmであるノニオン性高分子凝集剤が挙げられる。
ノニオン性高分子凝集剤の粉砕方法の例としては、ノニオン性高分子凝集剤を冷凍乾燥させた後に粉砕する方法や、ノニオン性高分子凝集剤をジェット気流乾燥させた後に、ジェットミルで粉砕する方法等が挙げられる。
本発明の土壌造粒用添加材の製造方法は、上述の粉砕工程の後、粉砕で得られた粉砕物(ノニオン性高分子凝集剤の粉末)を分級する分級工程を含むことができる。
[Additive for soil granulation]
One preferred embodiment of the additive for soil granulation of the present invention is one that is composed only of the nonionic polymer flocculant described above.
Further, as another preferred embodiment of the additive for soil granulation of the present invention, in addition to the above-mentioned nonionic polymer flocculant, the above-mentioned inorganic material, thickening material, and strength-enhancing agent Examples include one selected from among or two or more selected from among them.
As an example of a method for producing an additive for soil granulation, a nonionic polymer flocculant having a 90% weight cumulative particle size exceeding 400 μm is pulverized to obtain a nonionic polymer flocculant having a 90% weight cumulative particle size of 400 μm or less. Examples include those including a pulverization step to obtain an agent.
Examples of commercially available nonionic polymer flocculants having a 90% weight cumulative particle size of more than 400 μm include nonionic polymer flocculants having a 90% weight cumulative particle size of 800 to 1,200 μm. .
Examples of the method of pulverizing the nonionic polymer flocculant include a method of freeze-drying the nonionic polymer flocculant and then pulverizing it, and a method of jet stream drying the nonionic polymer flocculant and then pulverizing it with a jet mill. methods and the like.
The method for producing the additive for soil granulation of the present invention can include a classification step of classifying the pulverized material (nonionic polymer flocculant powder) obtained by the pulverization after the above pulverization step.

[土壌の改質方法]
本発明の土壌の改質方法は、土壌造粒用添加材を、処理対象物である土壌に添加して混合し、土壌が造粒されてなる改質された土壌(土壌造粒物の集合体)を得る添加材添加工程、を含むものである。
本発明の土壌造粒用添加材の適用の対象となる土壌としては、運搬や再利用の際に取り扱い難く、本発明の土壌造粒用添加材を必要とするものであればよく、例えば、粘性土、有機質土、火山灰質粘性土等が挙げられる。
該土壌としては、本発明の土壌造粒用添加材の適用の必要性の観点から、コーン指数が400kN/m以下のもの(特に、350kN/m以下のもの)が好ましい。
本明細書中、改質前の土壌におけるコーン指数とは、「JIS A 1228:2009」(締固めた土のコーン指数試験方法)に準拠した方法で測定される値をいう。
[Soil improvement method]
In the soil modification method of the present invention, a soil granulation additive is added to and mixed with soil to be treated, and the soil is granulated to obtain modified soil (a collection of soil granules and an additive addition step for obtaining a body).
The soil to which the additive for soil granulation of the present invention is applied may be any soil that is difficult to handle during transportation or reuse and requires the additive for soil granulation of the present invention. Examples include cohesive soil, organic soil, and volcanic cohesive soil.
The soil preferably has a cone index of 400 kN/m 2 or less (especially 350 kN/m 2 or less) from the viewpoint of the necessity of applying the additive for soil granulation of the present invention.
In the present specification, the cone index in soil before modification refers to a value measured by a method conforming to "JIS A 1228:2009" (cone index test method for compacted soil).

本発明の土壌の改質方法は、添加材添加工程の後に、改質された土壌を、目開き寸法が8~60mmの篩を用いて、篩分けして、篩を通過する細粒分の割合を求める篩分け工程、及び、篩分け工程で得た細粒分の割合の適否を評価して、本発明の土壌造粒用添加材を構成する成分組成を調整する成分組成調整工程、を含むことができる。
篩の目開き寸法は、8~60mm、好ましくは8~50mm、より好ましくは8~40mm、特に好ましくは8~30mmである。
該目開き寸法が8mm以上であると、細粒分の割合が過少になり該割合の適否の評価が困難になるのを、避けることができる。該目開き寸法が60mm以下であると、細粒分の割合が過大になり該割合の適否の評価が困難になるのを、避けることができる。
細粒分の割合の適否の評価の結果、「不適」と評価された場合、例えば、上述のノニオン性高分子凝集剤、無機系材料、増粘用材料、及び、強度促進材の中から選ばれる一つ以上について、その種類や量を変更すればよい。
In the soil modification method of the present invention, after the additive addition step, the modified soil is sieved using a sieve with an opening size of 8 to 60 mm, and fine particles passing through the sieve. A sieving step for obtaining the ratio, and a component composition adjusting step for evaluating the appropriateness of the ratio of the fine particles obtained in the sieving step and adjusting the component composition constituting the additive for soil granulation of the present invention. can contain.
The mesh size of the sieve is 8 to 60 mm, preferably 8 to 50 mm, more preferably 8 to 40 mm, particularly preferably 8 to 30 mm.
If the opening size is 8 mm or more, it is possible to avoid the difficulty in evaluating whether the ratio is appropriate due to an excessively small proportion of fine particles. If the opening dimension is 60 mm or less, it is possible to avoid the difficulty in evaluating the adequacy of the proportion due to an excessive proportion of fine particles.
As a result of evaluating the appropriateness of the proportion of fine particles, if it is evaluated as "unsuitable", for example, choose from the above-mentioned nonionic polymer flocculants, inorganic materials, thickening materials, and strength accelerators It is sufficient to change the type and amount of one or more of the

改質された土壌(土壌造粒物の集合体;以下、「改質土壌」ともいう。)の物性は、以下のとおりである。
9.5mm篩通過率は、好ましくは85質量%以上、より好ましくは90質量%以上、特に好ましくは95質量%以上である。
本明細書中、9.5mm篩通過率とは、改質土壌の全量中、目開き寸法が9.5mmである篩を通過する改質土壌の質量割合をいう。
コーン指数は、好ましくは400kN/m以上、より好ましくは450kN/m以上、さらに好ましくは500kN/m以上、特に好ましくは600kN/m以上である。
ここで、改質後の土壌におけるコーン指数とは、改質前の土壌1mに対して土壌造粒用添加材を所定の量(例えば、5kg)添加して混合してなる改質後の土壌について、「JIS A 1228:2009」(締固めた土のコーン指数試験方法)に準拠した方法で測定される値をいう。
このコーン指数は、改質対象土壌の硬さ特性に与える土壌造粒用添加材の効果を評価するために用いることができる。
pHは、好ましくは5.8~8.6、より好ましくは6.0~8.4、特に好ましくは6.2~8.2である。
本明細書中、pHとは、「JGS 0211-2009(土懸濁液のpH試験方法)」に準拠した、土懸濁液のpHをいう。
The physical properties of the modified soil (aggregate of soil granules; hereinafter also referred to as "improved soil") are as follows.
The 9.5 mm sieve passage rate is preferably 85% by mass or more, more preferably 90% by mass or more, and particularly preferably 95% by mass or more.
In the present specification, the 9.5 mm sieve passage rate refers to the mass ratio of the modified soil that passes through a sieve with an opening size of 9.5 mm in the total amount of the modified soil.
The cone index is preferably 400 kN/m 2 or higher, more preferably 450 kN/m 2 or higher, even more preferably 500 kN/m 2 or higher, and particularly preferably 600 kN/m 2 or higher.
Here, the cone index in the soil after modification refers to the soil after modification obtained by adding a predetermined amount (for example, 5 kg) of the additive for soil granulation to 1 m 3 of soil before modification and mixing. For soil, it refers to a value measured by a method conforming to "JIS A 1228:2009" (cone index test method for compacted soil).
This cone index can be used to evaluate the effect of the soil granulation additive on the hardness characteristics of the soil to be improved.
The pH is preferably 5.8-8.6, more preferably 6.0-8.4, particularly preferably 6.2-8.2.
As used herein, pH refers to the pH of a soil suspension in accordance with "JGS 0211-2009 (pH test method for soil suspension)".

以下、本発明を実施例により具体的に説明するが、本発明はこれらの実施例に限定されるものではない。
[実施例1~15、比較例1~11]
[1.使用材料]
(A)改質の対象である土壌
土壌として、表1に示す土壌を用いた。
EXAMPLES The present invention will be specifically described below by way of examples, but the present invention is not limited to these examples.
[Examples 1 to 15, Comparative Examples 1 to 11]
[1. Materials used]
(A) Soil to be Modified As the soil, the soil shown in Table 1 was used.

Figure 0007105595000001
Figure 0007105595000001

(B)高分子凝集剤
高分子凝集剤として、以下のものを用いた。
(1)ノニオン性高分子凝集剤A(ポリアクリルアミド系高分子凝集剤;三洋化成工業社製の「サンフロック N-500P」(商品名)の粉砕物;アニオン度:0(ゼロ);50%重量累積粒径:86μm;90%重量累積粒径:149μm)
(2)ノニオン性高分子凝集剤B(粉砕の程度が異なる以外はノニオン性高分子凝集剤Aと同じもの;50%重量累積粒径:135μm;90%重量累積粒径:244μm)
(3)ノニオン性高分子凝集剤C(粉砕を行わない以外はノニオン性高分子凝集剤Aと同じもの;50%重量累積粒径:779μm;90%重量累積粒径:982μm)
(4)アニオン性高分子凝集剤A(ポリアクリルアミド・アクリル酸系高分子凝集剤;三菱ケミカル社製の「ダイヤフロック AP120CH」(商品名)の粉砕物;50%重量累積粒径:78μm;90%重量累積粒径:139μm)
(5)アニオン性高分子凝集剤B(粉砕を行わない以外はアニオン性高分子凝集剤Aと同じもの;50%重量累積粒径:694μm;90%重量累積粒径:868μm)
(B) Polymer flocculant As the polymer flocculant, the following were used.
(1) Nonionic polymer flocculant A (polyacrylamide-based polymer flocculant; pulverized product of Sanyo Chemical Industries, Ltd. "Sunflock N-500P" (trade name); anion degree: 0 (zero); 50% Weight cumulative particle size: 86 μm; 90% weight cumulative particle size: 149 μm)
(2) Nonionic polymer flocculant B (same as nonionic polymer flocculant A except for a different degree of pulverization; 50% weight cumulative particle size: 135 μm; 90% weight cumulative particle size: 244 μm)
(3) Nonionic polymer flocculant C (same as nonionic polymer flocculant A except that pulverization is not performed; 50% weight cumulative particle size: 779 μm; 90% weight cumulative particle size: 982 μm)
(4) Anionic polymer flocculant A (polyacrylamide/acrylic acid-based polymer flocculant; pulverized product of “Diaflock AP120CH” (trade name) manufactured by Mitsubishi Chemical Corporation; 50% weight cumulative particle size: 78 μm; 90 % weight cumulative particle size: 139 μm)
(5) Anionic polymer flocculant B (same as anionic polymer flocculant A except that pulverization is not performed; 50% weight cumulative particle size: 694 μm; 90% weight cumulative particle size: 868 μm)

(C)無機系材料
無機系材料として、以下のものを用いた。
(1)炭酸カルシウム粉末(ブレーン比表面積:7,500cm/g;秩父太平洋セメント社製)
(2)半水石膏(ブレーン比表面積:4,100cm/g;チヨダウーテ社製)
(3)ゼオライト(ブレーン比表面積:5,500cm/g;日東粉化工業社製の「#70」(商品名)の粉砕物)
(4)活性白土(ブレーン比表面積:3,500cm/g;東新化成社製の「ニッカナイト S-200」(商品名))
(5)ベントナイト(ブレーン比表面積:5,300cm/g;クニミネ工業社製の「クニゲルV1」(商品名)の粉砕物)
(6)珪石粉末(ブレーン比表面積:3,800cm/g;秩父鉱業社製)
(7)珪藻土(ブレーン比表面積:4,400cm/g;稚内グリーンファクトリー社製)
(8)無水石膏(ブレーン比表面積:4,000cm/g;太平洋セメント社製)
(C) Inorganic Materials The following materials were used as inorganic materials.
(1) Calcium carbonate powder (Blane specific surface area: 7,500 cm 2 /g; manufactured by Chichibu Taiheiyo Cement Co., Ltd.)
(2) Hemihydrate gypsum (Blaine specific surface area: 4,100 cm 2 /g; manufactured by Chiyodaute Co., Ltd.)
(3) Zeolite (Blaine specific surface area: 5,500 cm 2 /g; pulverized “#70” (trade name) manufactured by Nitto Funka Kogyo Co., Ltd.)
(4) Activated clay (Blaine specific surface area: 3,500 cm 2 /g; “Nikka Night S-200” (trade name) manufactured by Toshin Kasei Co., Ltd.)
(5) Bentonite (Blaine specific surface area: 5,300 cm 2 /g; pulverized product of “Kunigel V1” (trade name) manufactured by Kunimine Industries)
(6) Silica stone powder (Blane specific surface area: 3,800 cm 2 /g; manufactured by Chichibu Mining Co., Ltd.)
(7) Diatomaceous earth (Blaine specific surface area: 4,400 cm 2 /g; manufactured by Wakkanai Green Factory)
(8) Anhydrous gypsum (Blaine specific surface area: 4,000 cm 2 /g; manufactured by Taiheiyo Cement Co., Ltd.)

(D)増粘用材料
増粘用材料として、以下のものを用いた。
(1)メチルセルロース(松本油脂社製の「マーポローズ ME-350TS」(商品名);粘度:17,700mPa・s)
(2)グアガム(三晶社製の「スーパーゲル200」(商品名);粘度:5,600mPa・s)
粘度の測定は、ブルックフィールド社製のB型粘度計(HBF)を用いて行なった。
(D) Thickening material The following materials were used as the thickening material.
(1) Methyl cellulose (“Marpolose ME-350TS” (trade name) manufactured by Matsumoto Yushi Co., Ltd.; viscosity: 17,700 mPa s)
(2) Guar gum (“Super Gel 200” (trade name) manufactured by Sansho; viscosity: 5,600 mPa s)
The viscosity was measured using a Brookfield viscometer (HBF).

(E)強度促進材
強度促進材として、以下のものを用いた。
(1)セメント(ブレーン比表面積:3,400cm/g;太平洋セメント社製の普通ポルトランドセメント)
(2)酸化マグネシウム粉末(ブレーン比表面積:6,100cm/g;太平洋セメント社製)
(3)生石灰(ブレーン比表面積:6,800cm/g;山陽太平洋ライム社製)
(4)高炉スラグ微粉末(ブレーン比表面積:4,100cm/g;デイシイ社製の「セラメントCR」(商品名))
(E) Strength Enhancer As the strength enhancer, the following were used.
(1) Cement (Blaine specific surface area: 3,400 cm 2 /g; ordinary Portland cement manufactured by Taiheiyo Cement Co., Ltd.)
(2) Magnesium oxide powder (Blaine specific surface area: 6,100 cm 2 /g; manufactured by Taiheiyo Cement Co., Ltd.)
(3) Quicklime (Blaine specific surface area: 6,800 cm 2 /g; manufactured by Sanyo Taiheiyo Lime Co., Ltd.)
(4) Ground granulated blast furnace slag (Blaine specific surface area: 4,100 cm 2 /g; “Cerament CR” (trade name) manufactured by Daisy Corporation)

[2.模擬粘土の固化処理]
表1の模擬粘土に対して、表2~表4に示す材料からなる土壌造粒用添加材を、表2~表4に示す添加量で添加し混合して、改質された模擬粘土(実施例1~11、比較例1~7)を得た。
これら改質された模擬粘土(実施例1~11、比較例1~7)について、9.5mm篩通過率、コーン指数、及び、pHを測定した。
結果を表2~表4に示す。
[2. Solidification treatment of simulated clay]
To the simulated clay in Table 1, soil granulation additives made of the materials shown in Tables 2 to 4 are added and mixed in the amounts shown in Tables 2 to 4, and the modified simulated clay ( Examples 1 to 11 and Comparative Examples 1 to 7) were obtained.
These modified simulated clays (Examples 1-11, Comparative Examples 1-7) were measured for 9.5 mm sieve throughput, cone index, and pH.
The results are shown in Tables 2-4.

[3.黒ボク土の固化処理]
表1の黒ボク土(入間産)に対して、表5に示す材料からなる土壌造粒用添加材を、表5に示す添加量で添加し混合して、改質された黒ボク土(実施例12~15、比較例8~11)を得た。
これら改質された模擬粘土(実施例12~15、比較例8~11)について、9.5mm篩通過率、コーン指数、及び、pHを測定した。
結果を表5に示す。
なお、表2~表5中、「ノニオン性高分子A」、「ノニオン性高分子B」、「ノニオン性高分子C」、「アニオン性高分子A」、「アニオン性高分子B」は、各々、「ノニオン性高分子凝集剤A」、「ノニオン性高分子凝集剤B」、「ノニオン性高分子凝集剤C」、「アニオン性高分子凝集剤A」、「アニオン性高分子凝集剤B」を意味する。
[3. Solidification treatment of black soil]
Addition materials for soil granulation consisting of the materials shown in Table 5 are added to the black soil (produced in Iruma) in Table 1 in the amount shown in Table 5 and mixed to improve the black soil (produced in Iruma). Examples 12-15 and Comparative Examples 8-11) were obtained.
These modified simulated clays (Examples 12-15, Comparative Examples 8-11) were measured for 9.5 mm sieve throughput, cone index, and pH.
Table 5 shows the results.
In Tables 2 to 5, "nonionic polymer A", "nonionic polymer B", "nonionic polymer C", "anionic polymer A", and "anionic polymer B" are respectively, "nonionic polymer flocculant A", "nonionic polymer flocculant B", "nonionic polymer flocculant C", "anionic polymer flocculant A", "anionic polymer flocculant B ” means.

表2~表5から、本発明の土壌造粒用添加材を用いた場合(実施例1~15)には、9.5mm篩通過率が85質量%以上であり、コーン指数が400kN/m以上であり、pHが5.8~8.6の範囲内(環境基準値)に収まることがわかる。
一方、本発明に該当しない土壌造粒用添加材を用いた場合(比較例1~11)には、「9.5mm篩通過率が85質量%以上」と「コーン指数が400kN/m以上」を共に満たすことができないことがわかる。
From Tables 2 to 5, when the soil granulation additive of the present invention was used (Examples 1 to 15), the 9.5 mm sieve passage rate was 85% by mass or more, and the cone index was 400 kN / m 2 or more, and the pH falls within the range of 5.8 to 8.6 (environmental standard value).
On the other hand, when using soil granulation additives that do not correspond to the present invention (Comparative Examples 1 to 11), "9.5 mm sieve passage rate is 85% by mass or more" and "Cone index is 400 kN/m 2 or more ” cannot be satisfied together.

Figure 0007105595000002
Figure 0007105595000002

Figure 0007105595000003
Figure 0007105595000003

Figure 0007105595000004
Figure 0007105595000004

Figure 0007105595000005
Figure 0007105595000005

Claims (5)

90%重量累積粒径が100~300μmであるノニオン性高分子凝集剤を含む 土壌造粒用添加材を製造するための方法であって、
90%重量累積粒径が800~1,200μmであるノニオン性高分子凝集剤を粉砕して、上記90%重量累積粒径が100~300μmであるノニオン性高分子凝集剤を得る粉砕工程を含み、
上記ノニオン性高分子凝集剤が、ポリアクリルアミド系高分子凝集剤である ことを特徴とする土壌造粒用添加材の製造方法
90% weight cumulative particle size100-300 μmContains a nonionic polymer flocculant that is A method for producing a soil granulation additive, comprising:
A pulverizing step of pulverizing a nonionic polymer flocculant having a 90% weight cumulative particle size of 800 to 1,200 μm to obtain a nonionic polymer flocculant having a 90% weight cumulative particle size of 100 to 300 μm. ,
The nonionic polymer flocculant is a polyacrylamide-based polymer flocculant Soil granulation additive characterized bymanufacturing method.
上記90%重量累積粒径が100~300μmであるノニオン性高分子凝集剤は、50%重量累積粒径が40~200μmのものである請求項1に記載の土壌造粒用添加材の製造方法。 The method for producing an additive for soil granulation according to claim 1, wherein the nonionic polymer flocculant having a 90% weight cumulative particle size of 100 to 300 µm has a 50% weight cumulative particle size of 40 to 200 µm. . 請求項1又は2に記載の土壌造粒用添加材の製造方法によって、上記土壌造粒用添加材を得た後、上記土壌造粒用添加材を、処理対象物である土壌に添加して混合し、上記土壌が造粒されてなる改質された土壌を得る添加材添加工程、を含むことを特徴とする土壌の改質方法。 After obtaining the additive for soil granulation by the method for producing an additive for soil granulation according to claim 1 or 2, the additive for soil granulation is added to the soil to be treated. A method for modifying soil, comprising a step of adding additives to obtain modified soil obtained by mixing and granulating the soil. 上記添加材添加工程の後に、上記改質された土壌を、目開き寸法が8~60mmの篩を用いて、篩分けして、上記篩を通過する細粒分の割合を求める篩分け工程、及び、上記篩分け工程で得た細粒分の割合の適否を評価して、上記土壌造粒用添加材を構成する成分組成を調整する成分組成調整工程、を含む請求項に記載の土壌の改質方法。 After the additive addition step, the modified soil is sieved using a sieve with an opening size of 8 to 60 mm, and the sieving step of determining the proportion of fine particles that pass through the sieve. And, the soil according to claim 3 , comprising a component composition adjustment step of evaluating the appropriateness of the proportion of fine particles obtained in the sieving step and adjusting the component composition constituting the additive for soil granulation. modification method. 上記土壌造粒用添加材が、上記90%重量累積粒径が100~300μmであるノニオン性高分子凝集剤のみからなり、かつ、上記添加材添加工程において、上記土壌造粒用添加材のみを、上記処理対象物である土壌に添加して混合する請求項3又は4に記載の土壌の改質方法。 The soil granulation additive consists only of a nonionic polymer flocculant having a 90% weight cumulative particle size of 100 to 300 μm, and in the additive addition step, only the soil granulation additive is added. 5. The method for modifying soil according to claim 3 or 4, wherein the soil is added to and mixed with the soil to be treated.
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