JPH05156251A - Improving agent for water-containing soil - Google Patents

Improving agent for water-containing soil

Info

Publication number
JPH05156251A
JPH05156251A JP3326172A JP32617291A JPH05156251A JP H05156251 A JPH05156251 A JP H05156251A JP 3326172 A JP3326172 A JP 3326172A JP 32617291 A JP32617291 A JP 32617291A JP H05156251 A JPH05156251 A JP H05156251A
Authority
JP
Japan
Prior art keywords
water
soil
improving agent
gypsum
lime
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP3326172A
Other languages
Japanese (ja)
Other versions
JP3243811B2 (en
Inventor
Kenji Mori
賢治 森
Mitsuaki Shiragami
光章 白神
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Kasei Corp
Original Assignee
Mitsubishi Kasei Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Kasei Corp filed Critical Mitsubishi Kasei Corp
Priority to JP32617291A priority Critical patent/JP3243811B2/en
Publication of JPH05156251A publication Critical patent/JPH05156251A/en
Application granted granted Critical
Publication of JP3243811B2 publication Critical patent/JP3243811B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Soil Conditioners And Soil-Stabilizing Materials (AREA)

Abstract

PURPOSE:To obtain the subject improving agent, composed of a fine aggregate, lime, gypsum and a water-soluble polymer and capable of improving the soil quality of construction residual soil at a high moisture content ratio, making the residual soil directly utilizable for plant refilling, etc., and preventing illegal dumping of the residual soil. CONSTITUTION:The objective improving agent is obtained by blending (A) a fine aggregate (preferably having 0.1-5mm grain diameter) with (B) lime (preferably quick lime) and/or gypsum (preferably anhydrous gypsum) and (C) a water- soluble polymer [preferably an acrylamide-based polymer containing (meth) acrylic acid or its salt]. The respective components are preferably used so as to provide 1:(2-100) weight ratio of the components (A):(B) and (1:2) to (1:250) weight ratio of the components (C):(B). For example, crushed concrete or crushed stone is preferably used as the component (A). Furthermore, the improving agent is preferably used in soil having a water content as high as 50-150%.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、含水土壌の改良剤に関
し、特に建設土木工事などに伴って発生する建設残土な
ど(以下、残土という)を土質改良し、資源として再利
用を図るのに適した含水土壌の改良剤に関するものであ
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-containing soil improving agent, and particularly for improving the soil of construction residual soil (hereinafter referred to as "remaining soil") generated by construction civil engineering work and the like, for reuse as a resource. The present invention relates to a suitable water-containing soil conditioner.

【0002】[0002]

【従来の技術】従来、各地で発生した残土の殆どは再利
用できず、埋立てしたり他の場所へ搬出したりしている
が、かなりの不法投棄があり、環境破壊の問題として重
要性が増してきている。これは残土の発生量が、活発な
再開発事業などで急増傾向にある半面、海面埋立て工事
が減少傾向であるため、残土受入場所の確保が難しくな
ってきていることに起因している。
2. Description of the Related Art Conventionally, most of the remaining soil generated in various places cannot be reused and is landfilled or carried out to other places, but there is considerable illegal dumping, which is an important issue for environmental destruction. Is increasing. This is because the amount of residual soil is increasing rapidly due to active redevelopment projects, while land reclamation work is decreasing, making it difficult to secure a place to receive residual soil.

【0003】また、道路工事の場合には掘り起こした現
場の埋め戻しに、法律上、砂を用いることと定められて
いる。従って、埋め戻しには一般に他の場所より山砂を
持ってこなければならず、こちらでも環境破壊の問題が
起こりつつある。このような情勢の中で発生した残土の
再利用に関して、生石灰を用いた残土処理のテストプラ
ントを稼働させている例がある。
In the case of road construction, it is legally required to use sand to backfill the dug up site. Therefore, in general, it is necessary to bring the sand and sand to the backfill from other places, and the problem of environmental destruction is also occurring here. Regarding the reuse of the residual soil generated in such a situation, there is an example of operating a test plant for the residual soil treatment using quicklime.

【0004】一方、首都圏を中心とした都市の再開発計
画で既設のビルディングを取壊し、高層化を進めている
が、取壊したコンクリート建造物の廃棄が問題となって
いる。一部は粉砕して再利用を行なっているが、大部分
は産業廃棄物として埋立て処理に回され、残土と同様に
不法投棄も多い。
On the other hand, although the existing buildings are being demolished to raise the building in a redevelopment plan centered on the metropolitan area, disposal of the demolished concrete structures has become a problem. Some of them are crushed and reused, but most of them are sent to landfill as industrial waste and are often dumped illegally like residual soil.

【0005】[0005]

【発明が解決しようとする課題】前記テストプラントの
方法は、良質な残土のみを対象とし、敷地が広大なため
天日乾燥し含水比の低い残土を対象に改良しているもの
である。一方、通常の改良プラントを考える場合は敷地
が広く取れないので、現場で発生した含水比の高い残土
を天日乾燥せずにそのまま改良しなければならず、この
ようは含水比の高い土は粘着性が大であり、混合機など
に付着して操業が難しく処理できない。また、処理して
も土の強度の向上が望めないなどの問題があった。
The method of the test plant described above is intended to improve only the residual soil of good quality, and is intended for the residual soil that is sun-dried and has a low water content because the site is vast. On the other hand, when considering an ordinary improvement plant, the site cannot be taken large, so the residual soil with a high water content generated at the site must be improved as it is without drying in the sun. It is highly sticky and adheres to mixers, etc., making it difficult to operate and not processing. In addition, there is a problem in that the strength of soil cannot be expected to improve even if treated.

【0006】[0006]

【課題を解決するための手段】本発明者等は、従来技術
の課題を解決し、残土の再利用に関し優れた改良剤を得
るべく鋭意検討した結果、細骨材と特定の成分を併用す
ることにより、残土などの含水土壌を埋め戻しに再利用
できることを見出し、本発明に到達した。即ち、本発明
の要旨は、細骨材、石灰および/または石コウ、お
よび水溶性重合体、とから成る含水土壌の改良剤に存
する。
Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the problems of the prior art and obtain an excellent improving agent for reusing the residual soil, and as a result, use a fine aggregate together with a specific component. As a result, they have found that water-containing soil such as residual soil can be reused for backfilling, and have reached the present invention. That is, the gist of the present invention lies in a hydrated soil improver comprising fine aggregate, lime and / or gypsum, and a water-soluble polymer.

【0007】以下、本発明を詳細に説明する。本発明に
おける含水土壌の改良とは、軟弱または粘着性の高い含
水土壌を埋め戻しなどに再利用するため、強度の向上を
図るとともに砂の様に流動性を付与し、また水中で膨潤
しないよう固化処理することである。従って、本発明に
おける含水土壌の改良とは、含水土壌を単に塊状固化
し、流動性が失われた状態にするものではない。
The present invention will be described in detail below. The improvement of the water-containing soil in the present invention is to reuse the water-containing soil having high softness or high stickiness for backfilling and the like, so as to improve the strength and impart fluidity like sand, and to prevent swelling in water. It is to solidify. Therefore, the improvement of the water-containing soil in the present invention does not mean that the water-containing soil is simply solidified into a solid state to lose fluidity.

【0008】本発明に使用する細骨材は、平均粒径が、
通常0.02〜10mm、好ましくは0.1〜5mmの
骨材である。該範囲において残土の強度向上が顕著に認
められる。骨材としてはコンクリート破砕物、砂、砂
利、砕石などの粒状の材材が例示される。天然の骨材と
しては、深成岩のほか、安山岩、玄武岩、砂岩などから
得られたものが好ましい。これら細骨材は、比重が、通
常2.0〜3.0g/cm3、またJIS A1104
の標準試験による単位容積重量が、通常1500〜20
00kg/cm 3である。
The fine aggregate used in the present invention has an average particle size of
Usually 0.02 to 10 mm, preferably 0.1 to 5 mm
It is an aggregate. In the range, the strength of the residual soil is remarkably improved.
To be Aggregate concrete crushed material, sand, sand
Examples are granular materials such as stone and crushed stone. With natural aggregate
In addition to plutonic rock, andesite, basalt, sandstone, etc.
The obtained one is preferable. These fine aggregates have a specific gravity
Always 2.0-3.0 g / cm3, Again JIS A1104
Unit weight by standard test is usually 1500-20
00 kg / cm 3Is.

【0009】本発明に使用する石灰は、好ましくは生石
灰であるが、消石灰を用いることもできる。生石灰は通
常市販されているものでよく、また、一般の食品工業や
家庭から発生した魚介類の骨殻、および発電所等の冷却
管に付着した貝殻などを焼いて粉砕して得たものを用い
ることもできる。
The lime used in the present invention is preferably quick lime, but slaked lime can also be used. The quicklime may be one that is usually sold on the market. It can also be used.

【0010】本発明に使用する石コウは、好ましくは無
水石コウであるが、半水石コウを用いることもできる。
石灰および/または石コウと、細骨材の重量比は、特に
制限があるものではないが、通常1:1〜250、好ま
しくは1:2〜100で使用される。
The gypsum used in the present invention is preferably anhydrous gypsum, but hemihydrate gypsum can also be used.
The weight ratio of lime and / or gypsum and fine aggregate is not particularly limited, but is usually 1: 1 to 250, preferably 1: 2 to 100.

【0011】本発明に使用する水溶性重合体とは、通
常、少なくとも1000mlの水に1g以上溶解する重
合体であって、一般には、(メタ)アクリルアミドの単
独重合体またはその共重合体が例示される。該共重合体
としては、好ましくは親水性基としてカルボキシル基を
有するものであり、特に重合体を構成する全単量体のう
ち、カルボキシル基を有する単量体が、通常1〜80モ
ル%、好ましくは5〜60モル%含まれるものである。
また、カルボキシル基は、遊離酸または塩の形のどちら
で存在していてもよい。
The water-soluble polymer used in the present invention is usually a polymer soluble in at least 1000 ml of water in an amount of 1 g or more, and is generally a (meth) acrylamide homopolymer or a copolymer thereof. To be done. The copolymer preferably has a carboxyl group as a hydrophilic group, and in particular, of all monomers constituting the polymer, the monomer having a carboxyl group is usually 1 to 80 mol%, It is preferably contained in an amount of 5 to 60 mol%.
In addition, the carboxyl group may be present in either free acid or salt form.

【0012】塩の種類としては、例えばナトリウム、カ
リウムなどのアルカリ金属の塩、カルシウム、マグネシ
ウムなどのアルカリ土類金属の塩、アンモニウム塩、炭
素数1〜18のアルキルアミン、アルカノールアミンな
どのアミン塩、およびこれら2種以上の混合物がある
が、好ましくはアルカリ金属の塩である。
Examples of the salt include alkali metal salts such as sodium and potassium, alkaline earth metal salts such as calcium and magnesium, ammonium salts, amine salts such as alkylamines having 1 to 18 carbon atoms and alkanolamines. , And a mixture of two or more of them, but an alkali metal salt is preferable.

【0013】かかるカルボキシル基を有する水溶性重合
体としては、(メタ)アクリル酸またはその塩を含有す
る(メタ)アクリルアミド系重合体、マレイン酸または
その塩と酢酸ビニルとの共重合体、イタコン酸またはそ
の塩と(メタ)アクリルアミドとの共重合体などがある
が、好ましくは(メタ)アクリル酸またはその塩を含有
するアクリルアミド系重合体である。(メタ)アクリル
酸またはその塩を含有するアクリルアミド系重合体とし
ては、(メタ)アクリル酸またはその塩と(メタ)アク
リルアミドを共重合したもののほか、(メタ)アクリル
アミドを部分加水分解したものでもよい。また、以上示
したような単量体を組合せて共重合したものでもよい。
As the water-soluble polymer having a carboxyl group, a (meth) acrylamide-based polymer containing (meth) acrylic acid or a salt thereof, a copolymer of maleic acid or a salt thereof with vinyl acetate, and itaconic acid. Alternatively, there are copolymers of salts thereof with (meth) acrylamide, and the like, and acrylamide polymers containing (meth) acrylic acid or salts thereof are preferable. The acrylamide polymer containing (meth) acrylic acid or a salt thereof may be a copolymer of (meth) acrylic acid or a salt thereof and (meth) acrylamide, or a partially hydrolyzed product of (meth) acrylamide. .. Further, a copolymer obtained by combining the above-mentioned monomers may be used.

【0014】更に、上記の重合体には、親水性基として
スルホン酸基を含む単量体、例えばビニルスルホン酸、
アリルスルホン酸、2−アクリルアミド−2−メチルプ
ロパンスルホン酸及びこれらの塩などを含めて共重合し
たものでももい。また、水溶性を阻害しない程度の量で
あれば、オレフィン、アクリル酸エステル、ビニルエス
テルのような疎水性単量体を含んでいてもよい。
Further, in the above polymer, a monomer containing a sulfonic acid group as a hydrophilic group, such as vinyl sulfonic acid,
It may be a copolymer containing allyl sulfonic acid, 2-acrylamido-2-methylpropane sulfonic acid and salts thereof. Further, a hydrophobic monomer such as an olefin, an acrylic ester, or a vinyl ester may be contained as long as it does not impair the water solubility.

【0015】本発明で使用される水溶性重合体の分子量
は、通常100万以上、好ましくは500万以上であ
る。製法は特に限定されないが、一般にラジカル重合法
であり、水または低級アルコールなどを溶媒とした溶液
重合が採用される。単量体の濃度は、通常10重量%以
上、好ましくは15〜60重量%である。
The molecular weight of the water-soluble polymer used in the present invention is usually 1,000,000 or more, preferably 5,000,000 or more. Although the production method is not particularly limited, it is generally a radical polymerization method, and solution polymerization using water or a lower alcohol as a solvent is adopted. The concentration of the monomer is usually 10% by weight or more, preferably 15 to 60% by weight.

【0016】重合開始剤は水溶媒で重合する場合、過硫
酸カリウム、過硫酸アンモニウムなどの過酸化物、およ
びそれらを用いたレドックス系開始材、N、N’−アゾ
ビス−(2−アミジノプロパン)・2塩酸塩、4、4’
−アゾビス−(4−シアノ吉草酸)−2−ナトリウムな
どの水溶性ラジカル重合開始剤が好ましい。ラジカル重
合開始剤の使用量は、共重合可能な単量体の混合物の重
量に対して通常0.005〜5重量%、好ましくは0.
05〜0.5重量%である。
When a polymerization initiator is polymerized in an aqueous solvent, peroxides such as potassium persulfate and ammonium persulfate, and redox type initiators using them, N, N'-azobis- (2-amidinopropane). Dihydrochloride, 4,4 '
A water-soluble radical polymerization initiator such as -azobis- (4-cyanovaleric acid) -2-sodium is preferable. The amount of the radical polymerization initiator used is usually 0.005 to 5% by weight, preferably 0.1% to the weight of the copolymerizable monomer mixture.
It is from 05 to 0.5% by weight.

【0017】重合方法は、特に制限されないが、水溶液
重合を例示するならば、撹拌下重合する方法、容器中で
静置し断熱状態で重合する方法、シート状で除熱しつつ
重合する方法、油中水型エマルジョンまたは分散状態で
重合する方法が例示される。静置して重合する方法とし
ては、所定の単量体水溶液に窒素ガスを通じて酸素を除
いた後、所定温度とし、ラジカル重合開始剤を添加し均
一に混合後、窒素ガス気流化、所定温度に保持する方法
が例示される。重合温度は、通常10〜150℃、好ま
しくは40〜80℃の範囲で目的の重合物の分子量に応
じて選択される。
The polymerization method is not particularly limited, but if an aqueous solution polymerization is exemplified, a method of polymerization with stirring, a method of polymerization in an adiabatic state by standing in a container, a method of polymerization while removing heat in a sheet form, an oil A method of polymerizing in a water-in-water emulsion or dispersion state is exemplified. As a method of polymerizing by standing, after removing oxygen through a predetermined monomer aqueous solution through nitrogen gas, the mixture is brought to a predetermined temperature, and a radical polymerization initiator is added and uniformly mixed, and then a nitrogen gas stream is formed and a predetermined temperature is obtained. A holding method is exemplified. The polymerization temperature is usually selected in the range of 10 to 150 ° C, preferably 40 to 80 ° C, depending on the molecular weight of the target polymer.

【0018】かくして得られた重合体はそのまま乾燥器
で乾燥、または脱水剤で処理した後、乾燥し粉砕して試
料に供される。水溶性重合体と石灰および/または石コ
ウの混合重量比は、特に制限はないが、通常1:1〜5
00、好ましくは1:2〜1:250の範囲で用いられ
る。
The polymer thus obtained is directly dried in a drier or treated with a dehydrating agent, dried and pulverized before being used as a sample. The mixing weight ratio of the water-soluble polymer and lime and / or gypsum is not particularly limited, but is usually 1: 1 to 5
00, preferably in the range of 1: 2 to 1: 250.

【0019】本発明の改良剤の添加量は、被処理土壌の
含水比により異なるため特に限定されないが、前述した
各成分の重量比の範囲において、石灰および/または石
コウの添加量は、残土に対して、通常0.2〜20重量
%、好ましくは0.5〜10重量%であり、細骨材の添
加量は、通常0.5〜50重量%、好ましくは1〜30
重要%の範囲であり、水溶性重合体の添加量は、通常
0.001〜1重量%、好ましくは0.01〜0.5重
量%の範囲である。
The addition amount of the improving agent of the present invention is not particularly limited because it varies depending on the water content of the treated soil, but the addition amount of lime and / or gypsum is the same as the amount of residual soil within the range of the weight ratio of each component described above. On the other hand, it is usually 0.2 to 20% by weight, preferably 0.5 to 10% by weight, and the amount of fine aggregate added is usually 0.5 to 50% by weight, preferably 1 to 30%.
The range is important%, and the amount of the water-soluble polymer added is usually 0.001 to 1% by weight, preferably 0.01 to 0.5% by weight.

【0020】本発明の含水土壌の改良剤では、石灰また
は石コウによる土壌の改良効果が、水溶性重合体を添加
することによってより促進される。それは、水溶性重合
体の添加により土壌を造粒する際の粒子間の付着が防止
され流動性が保持されるためと推定される。そして、更
に細骨材を併用することにより、土の強度、もしくは地
盤支持力が相重的に改善されるものである。
In the water-containing soil improving agent of the present invention, the soil improving effect of lime or gypsum is further promoted by adding a water-soluble polymer. It is presumed that this is because the addition of the water-soluble polymer prevents the particles from adhering to each other when the soil is granulated and maintains the fluidity. Further, by further using fine aggregate together, the strength of soil or the ground supporting force is reciprocally improved.

【0021】次に、本発明の対象となる土壌は、通常、
含水比20以上の土壌である。特に本発明の改良剤の使
用が期待できるのは、含水比40〜200%、さらには
含水比50〜150%程度の含水比の高い土壌であり、
具体的には上下水道工事、道路工事、宅地造成工事など
一般の土木・建設工事にともなって発生する残土であ
る。なお、含水比とは、110℃の炉乾燥によって失わ
れる土水の質量の、土の炉乾燥質量に対する比を百分率
で表した値であり、JIS A1203(含水比試験方
法)によって測定される値である。
Next, the soil to which the present invention is applied is usually
It is a soil with a water content ratio of 20 or more. In particular, the use of the improving agent of the present invention can be expected in soil having a high water content ratio of 40 to 200%, further 50 to 150%.
Specifically, it is the residual soil generated by general civil engineering and construction work such as water supply and sewerage construction, road construction, and residential land development. The water content ratio is a value representing the ratio of the mass of soil water lost by oven drying at 110 ° C to the oven dry mass of soil in percentage, and the value measured by JIS A1203 (water content test method). Is.

【0022】土質には関東ローム層、砂礫、土砂などが
あり、通常はこれらの混合物であるが、発生現場によっ
てはコンクリート片などが混入している場合もある。含
水比は土質により異なるため、発生する現場によるとこ
ろが大きい。含水比の高いものには例えば関東ローム層
があり、通常80〜130%前後の含水比を示し、粘着
性が大きいが、本発明の改良剤を使用することにより固
化および造粒されるため流動性が付与され、粘着性およ
び水中での膨潤性が無くなり、地盤支持力が向上し埋め
戻し再利用可能とすることができる。
The soil includes Kanto loam layer, gravel, sand and the like, which is usually a mixture of these, but concrete fragments may be mixed depending on the site of occurrence. Since the water content depends on the soil type, it depends largely on the site where the water is generated. The one having a high water content ratio is, for example, the Kanto loam layer, which usually has a water content ratio of about 80 to 130% and has a large tackiness, but it is solidified and granulated by using the improving agent of the present invention so that it is fluidized. Property is imparted, the adhesiveness and the swelling property in water are eliminated, and the ground supporting force is improved, and the backfilling can be reused.

【0023】本発明の改良剤の添加方法は特に限定され
ないが、好ましくは細骨材および水溶性重合体を添加混
合後に石灰および/または石コウを添加する方法である
が、同時に添加混合またはプレミックスして使用しても
何等差しつかえない。また、土壌との混合か通常の方
法、例えばベルトコンベヤ上の含水℃場に改良剤を散布
し、バックホウにより混合する方法などが用いられる。
細骨材、石灰、石コウは、通常いずれも粉末のまま添加
されるが、水溶性重合体は粉末状の他、水溶液として添
加してもよい。
The method of adding the improving agent of the present invention is not particularly limited, but it is preferably a method of adding lime and / or gypsum after adding and mixing the fine aggregate and the water-soluble polymer. It doesn't matter what you mix and use. In addition, a method of mixing with soil or an ordinary method, for example, a method of spraying an improving agent in a hydrous temperature field on a belt conveyor and mixing with a backhoe is used.
Fine aggregate, lime, and gypsum are usually added as powders, but the water-soluble polymer may be added as an aqueous solution in addition to a powder.

【0024】本発明の改良剤中には、その他、高吸水性
重合体、セメントなどを任意の割合で加えることがで
き、また、これらを別個に土壌混合時に加えてもよい。
In the improver of the present invention, a super absorbent polymer, cement and the like can be added in an optional ratio, or these may be added separately at the time of soil mixing.

【0025】[0025]

【実施例】以下、本発明を実施例により更に具体的に説
明するが、本発明はその要旨を越えない限り、以下の実
施例に限定されるものではない。
EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded.

【0026】実施例1〜3および比較例1〜9 含水土壌のうちで処理の困難な、含水比130%の関東
ローム層を原料土として用い、改良試験を行なった。細
骨材として平均粒径約1.7mmのリサイクルコンクリ
ート(コンクリートの粉砕品で以下「RC」と略す)を
使用した。
Examples 1 to 3 and Comparative Examples 1 to 9 Improvement tests were carried out using a Kanto loam layer having a water content of 130%, which is difficult to treat among the water-containing soils, as a raw material soil. As fine aggregate, recycled concrete having an average particle size of about 1.7 mm (a crushed concrete product and abbreviated as “RC” below) was used.

【0027】原料土とRCを所定の割合で混合し、夫々
7kgずつポリエチレン袋に小分けし、改良処理を行な
った。改良処理は、各袋中に水溶性重合体粉末を7gず
る降り掛けながら混合した後、210gの生石灰の粉末
を加えてかき混ぜた。更に水分が飛ばないように直ちに
密封した。6日間密閉養生後、JIS A1210(突
き固めによる土の締め固め試験方法)に従い、内径15
cmのモールドに改良土を3層に分けて夫々、4.5k
gのランマーで92回突き固めて、突き固め試験を行な
った。
The raw material soil and RC were mixed at a predetermined ratio, and each 7 kg was subdivided into a polyethylene bag for improvement treatment. In the improvement treatment, 7 g of the water-soluble polymer powder was slid down into each bag and mixed, and 210 g of quicklime powder was added and stirred. Further, the container was immediately sealed so that the water content would not fly off. After sealed and cured for 6 days, an inner diameter of 15 according to JIS A1210 (test method for soil compaction by tamping)
The improved soil is divided into 3 layers in a cm mold and 4.5k each
A tamping test was performed by tamping with a grammer 92 times.

【0028】次に、JISA1211(CBR試験方
法)に従い、浸水膨張試験の準備を行ない、4日間水槽
に浸漬して膨張量を追跡した。更に、水槽より取り出し
て水を取り除き、15分後に所定の測定を行なった後、
CBR(CaliforniaBearing Rat
io)試験器により荷重一貫入量曲線を求めた。
Next, according to JISA1211 (CBR test method), preparation for a water immersion expansion test was carried out, and the amount of expansion was traced by immersing in a water tank for 4 days. Furthermore, after taking out from the water tank to remove water and performing a predetermined measurement after 15 minutes,
CBR (California Bearing Rat)
io) A load consistent entry curve was determined by a tester.

【0029】貫入量2.5mmに於ける荷重(以下、貫
入強度と略す)を読取り次の式によりCBRを計算す
る。式中の標準荷重はJISで定めらられている2.5
mm貫入時の標準荷重、1,370kgを用いた。CB
R値は大きいほど強度が高いことを示す。
The load (hereinafter, abbreviated as penetration strength) at a penetration amount of 2.5 mm is read and CBR is calculated by the following formula. The standard load in the formula is 2.5 specified by JIS.
A standard load of 1,370 kg at the time of mm penetration was used. CB
The larger the R value, the higher the strength.

【0030】 CBR=(貫入強度/標準荷重)×100(%) また、改良土の状態を目視観察した。以上の試験の結果
を表−1に示す。
CBR = (penetration strength / standard load) × 100 (%) Further, the state of the improved soil was visually observed. The results of the above tests are shown in Table-1.

【0031】また、同時に測定した水浸4日後の膨張量
より求めた膨張比はいずれも1%以下で良好であった。
なお、使用した水溶性重合体Aはアクリルアミド:アク
リル酸ナトリム=85:15モル比の共重合体で極限粘
度[η]は22.3であり、Bはアクリルアミド:アク
リル酸ナトリム=70:30モル比の共重合体で極限粘
度[η]は15.3である。いずれも土に対して、0.
1重量%併用した。
The expansion ratios obtained from the simultaneously measured expansion amounts after 4 days of water immersion were good at 1% or less.
The water-soluble polymer A used was a copolymer having an acrylamide: sodium acrylate = 85: 15 molar ratio and an intrinsic viscosity [η] of 22.3, and B was acrylamide: sodium acrylate = 70: 30 mol. The intrinsic viscosity [η] of the copolymer is 15.3. Both are 0.
1% by weight was used together.

【0032】比較例1〜4はRCを使用しなかった場
合、比較例5、6はRCのみ混合した場合、比較例7、
8はRCと生石灰を使用した場合、比較例9、11はR
Cと水溶性重合体を併用した場合、および比較例10は
RC単独の場合の試験結果である。なお、比較例1、
2、5は、粘着性が大きいため突き固め試験機に掛から
なかったので、手で突き固めたときの参考値である。
In Comparative Examples 1 to 4, no RC was used, in Comparative Examples 5 and 6, only RC was mixed, Comparative Example 7,
8 is RC and quicklime is used, Comparative Examples 9 and 11 are R
C is the test result when the water-soluble polymer is used in combination, and Comparative Example 10 is the test result when RC is used alone. In addition, Comparative Example 1,
Nos. 2 and 5 were reference values when tamped by hand, because they did not hang on the tamping tester due to their high tackiness.

【0033】[0033]

【表1】 A:アクリルアミド:アクリル酸ナトリウム=85:1
5モル比 B:アクリルアミド:アクリル酸ナトリウム=70:3
0モル比
[Table 1] A: Acrylamide: Sodium acrylate = 85: 1
5 molar ratio B: acrylamide: sodium acrylate = 70: 3
0 molar ratio

【0034】実施例7〜9および比較例12〜17 リサイクルコンクリートの代りに平均粒径0.15mm
の山砂を使う以外は、実施例1と同様に処理して、試験
を行ない、結果を表−2に示す。なお、比較例12は山
砂を60重量%添加した場合、比較例13は山砂60重
量%と改質剤として水溶性重合体Aを残土および山砂に
対して0.1重量%併用使用した場合、比較例14〜1
6は山砂と生石灰で処理した場合、および比較例17は
山砂単独場合である。なお、比較例12は、手で突き固
めたときの参考値である。
Examples 7-9 and Comparative Examples 12-17 Instead of recycled concrete, the average particle size is 0.15 mm.
The same treatment as in Example 1 was carried out except that the above-mentioned sand was used, and the test was conducted. The results are shown in Table-2. In Comparative Example 12, when 60% by weight of sand is added, Comparative Example 13 uses 60% by weight of sand and 0.1% by weight of the water-soluble polymer A as a modifier for the residual soil and sand. When done, Comparative Examples 14 to 1
No. 6 is a case of treating with sand sand and quick lime, and Comparative Example 17 is a case of sole sand. In addition, Comparative Example 12 is a reference value when tamped with a hand.

【0035】[0035]

【表2】 [Table 2]

【0036】実施例10、11および比較例18、19 生石灰の代りに石コウを用いた以外は実施例7と同様に
処理して試験を行なった。結果を表−3に示す。なお、
比較例18、19は重合体を併用しなかった場合の試験
結果である。
Examples 10 and 11 and Comparative Examples 18 and 19 Tests were carried out in the same manner as in Example 7 except that gypsum was used instead of quicklime. The results are shown in Table-3. In addition,
Comparative Examples 18 and 19 are the test results when the polymer was not used in combination.

【0037】[0037]

【表3】 [Table 3]

【0038】[0038]

【発明の効果】従来に技術では、利用困難で不法投棄の
対象となっていた高含水比の残土が、本発明の含水土壌
の改良剤を用いることにより、そのまま天日乾燥せずに
プラントで改良可能となり、資源としてそのまま埋め戻
し等に再利用することができるのみならず、現在、処理
に困っているコンクリート廃材や、陶器、コンクリート
片の混入した残土も資源として利用できる。
EFFECTS OF THE INVENTION In the prior art, the residual soil with a high water content ratio, which was difficult to use and was subject to illegal dumping, can be used in a plant without being dried in the sun without using the water-containing soil improving agent of the present invention. Not only can it be improved, it can be reused as a resource for backfilling as it is, and now it can be used as a resource, such as concrete waste materials that are currently in trouble, and residual soil mixed with pottery and concrete pieces.

【0039】かくして残土や今後増大するコンクリート
廃棄物の不法投棄を防止するとともに、埋め戻し用砂な
どの採取による環境破壊を防止できるため、地域社会に
貢献するところが大である。
Thus, it is possible to prevent the illegal dumping of the residual soil and the concrete waste which will increase in the future, and also to prevent the environmental destruction due to the extraction of the sand for backfilling.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 細骨材、石灰および/または石コ
ウ、および水溶性重合体、とから成る含水土壌の改良
剤。
1. A hydrated soil conditioner comprising fine aggregate, lime and / or gypsum, and a water-soluble polymer.
JP32617291A 1991-12-10 1991-12-10 Aqueous soil conditioner Expired - Fee Related JP3243811B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32617291A JP3243811B2 (en) 1991-12-10 1991-12-10 Aqueous soil conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32617291A JP3243811B2 (en) 1991-12-10 1991-12-10 Aqueous soil conditioner

Publications (2)

Publication Number Publication Date
JPH05156251A true JPH05156251A (en) 1993-06-22
JP3243811B2 JP3243811B2 (en) 2002-01-07

Family

ID=18184851

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32617291A Expired - Fee Related JP3243811B2 (en) 1991-12-10 1991-12-10 Aqueous soil conditioner

Country Status (1)

Country Link
JP (1) JP3243811B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2722522A1 (en) * 1994-07-12 1996-01-19 Malliard Hugues De Stabilising soil against erosion
CN103688621A (en) * 2013-12-17 2014-04-02 中国农业科学院烟草研究所 Tobacco field soil improving method
JP2016069444A (en) * 2014-09-29 2016-05-09 アイシン高丘株式会社 Soil modifier for wet soil and recovery method of soil
JP2018030958A (en) * 2016-08-25 2018-03-01 日鉄住金セメント株式会社 Modifier for soft soil or the like and solidification treatment method of remaining soil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2722522A1 (en) * 1994-07-12 1996-01-19 Malliard Hugues De Stabilising soil against erosion
CN103688621A (en) * 2013-12-17 2014-04-02 中国农业科学院烟草研究所 Tobacco field soil improving method
JP2016069444A (en) * 2014-09-29 2016-05-09 アイシン高丘株式会社 Soil modifier for wet soil and recovery method of soil
JP2018030958A (en) * 2016-08-25 2018-03-01 日鉄住金セメント株式会社 Modifier for soft soil or the like and solidification treatment method of remaining soil

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