JPH09125060A - Water-containing soil conditioner composed of gypsum hemihydrate - Google Patents

Water-containing soil conditioner composed of gypsum hemihydrate

Info

Publication number
JPH09125060A
JPH09125060A JP7308495A JP30849595A JPH09125060A JP H09125060 A JPH09125060 A JP H09125060A JP 7308495 A JP7308495 A JP 7308495A JP 30849595 A JP30849595 A JP 30849595A JP H09125060 A JPH09125060 A JP H09125060A
Authority
JP
Japan
Prior art keywords
soil
gypsum
water
sludge
soil conditioner
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.)
Pending
Application number
JP7308495A
Other languages
Japanese (ja)
Inventor
Masao Matsunaga
全央 松永
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.)
TERABONDO KK
Terabondo KK
Original Assignee
TERABONDO KK
Terabondo KK
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 TERABONDO KK, Terabondo KK filed Critical TERABONDO KK
Priority to JP7308495A priority Critical patent/JPH09125060A/en
Publication of JPH09125060A publication Critical patent/JPH09125060A/en
Pending legal-status Critical Current

Links

Landscapes

  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a water-containing soil conditioner having excellent safety and economic merits and effective for solidifying various sludge having high water content such as construction sludge to improve the soil by compounding gypsum hemihydrate produced by the heat-treatment of crystalline gypsum as a main component. SOLUTION: The objective water-containing soil conditioner for solidifying and improving soil having high water content is composed mainly of gypsum hemihydrate (CaSO4 .0.5H2 O) produced by heating crystalline gypsum dihydrate (CaSO4 .2H2 O) at 100-160 deg.C. A water-containing soil having a water content of 20-200%, e.g. various highly water-containing sludge such as construction sludge having a cone index of <2 can be solidified by the use of the objective new water-containing soil conditioner composed of gypsum hemihydrate, having excellent safety and economic merit and giving improved soil effective also for the cultivation of vegetables by the components N(nitrogen), P(phosphorus), K(potassium), Ca(calcium), Mg(magnesium), S(sulfur), etc., existing in the natural gypsum dihydrate.

Description

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

【0001】[0001]

【発明の属する技術分野】本発明は、含水土壌に対する
新規な土壌改良剤に関する。更に詳しくは、本発明は、
含水土壌を固化して土壌改良を図るために使用される半
水セッコウ(CaSO4 ・0.5H2 O )を主成分とした半水セ
ッコウ系の含水土壌改良剤に関するものである。
The present invention relates to a novel soil conditioner for hydrous soil. More specifically, the present invention provides:
The present invention relates to a semi-hydrated gypsum-based water-containing soil conditioner containing semi-hydrated gypsum (CaSO 4 .0.5H 2 O) as a main component, which is used for solidifying a hydrous soil to improve the soil.

【0002】[0002]

【従来の技術】昨今の厳しい公害規制を反映して、新た
な汚泥処理技術の確立がせまられている。その一例を建
設汚泥にみると、海洋投棄(不法投棄)の禁止はもとよ
り、建設工事主の完全処理が義務づけられようとしてい
る。前記した建設汚泥とは、コーン指数確認試験(JS
F T 716)において、コーン指数2.0未満のも
ので、やや正確性を欠くが人間が長靴をはいて歩くこと
が出来ないほど軟弱な汚泥のことである。一方、コーン
指数が2.0以上の土壌とは、人間が歩くことができる
硬さの土壌である。
2. Description of the Related Art A new sludge treatment technology has been established in light of recent severe pollution regulations. In the case of construction sludge, one example is the ban on marine dumping (illegal dumping), as well as the complete disposal of construction workers. The construction sludge mentioned above is a cone index confirmation test (JS
In F T 716), it is a sludge having a cone index of less than 2.0, which is slightly inaccurate but too soft to allow humans to walk with boots. On the other hand, the soil having a corn index of 2.0 or more is a soil having a hardness that allows humans to walk.

【0003】建設汚泥は、各地の建設現場で多量に発生
するものであり、その性状からしてそのままの状態では
再利用することが困難なものである。このため、今ま
で、建設汚泥は、独自の貯蔵ヤードを設けて脱水(乾
燥)処理したり、または独自の埋立て処理場で埋立て処
分したり、更には他の埋立て処分場に搬送して埋立て処
分して来た。なお、他の処分場への搬送過程において、
建設汚泥がこぼれ落ちるなどして二次公害を生んでい
る。しかしながら、前記した昨今の厳しい公害規制のも
のでは、前記したアプローチ(埋立て)ができず、その
早急な対策がせまられている。特に建設汚泥は、地下構
造物の工法としてシールド工法やベントナイト工法を採
用しているため、PH値の高い汚泥が多量に発生してい
るため、その対策が急がれている。
[0003] Construction sludge is generated in large quantities at construction sites in various places, and due to its properties, it is difficult to reuse it as it is. For this reason, construction sludge has been dewatered (dried) in its own storage yard, or landfilled in its own landfill, or transported to another landfill. And landfilled. In the process of transportation to another disposal site,
Secondary sludge is caused by construction sludge spilling over. However, the above-mentioned recent strict pollution control cannot perform the above-mentioned approach (landfill), and urgent countermeasures are required. Particularly for construction sludge, since the shield construction method and the bentonite construction method are adopted as the construction method of the underground structure, a large amount of sludge with a high PH value is generated, and therefore countermeasures are urgently needed.

【0004】当業界において、前記建設汚泥を固化し、
コーン指数を2.0以上の改良土とし、第3種もしくは
第4種の建設発生土と同じように埋立て用(埋め戻し
用)などに利用する建設汚泥の固化技術が提案されてい
る。前記した従来の建設汚泥の固化技術において、とく
にその中核となる固化剤をみると、(1) セメント系固化
剤、(2) 生石灰(CaO )系固化剤、(3) 合成高分子系固
化剤(例えば、特開平4−345685号には、カルボ
キシル基を含有する水溶性重合体と石灰(CaO ,CaC
O3 )とからなる固化剤が提案されている)、などが提
案されている。
In the industry, the construction sludge is solidified,
A solidification technique of construction sludge has been proposed in which an improved soil having a cone index of 2.0 or more is used for landfilling (for backfilling) and the like in the same manner as the third or fourth kind of construction-generated soil. Among the conventional solidification technologies for construction sludge, the solidifying agents at the core of the solidification technologies are as follows: (1) Cement-based solidifying agent, (2) Quick lime (CaO) -based solidifying agent, (3) Synthetic polymer solidifying agent (For example, in JP-A-4-345685, a water-soluble polymer containing a carboxyl group and lime (CaO, CaC
O 3 ) and a solidifying agent are proposed), and the like.

【0005】[0005]

【発明が解決しようとする課題】前記した従来の土壌改
良剤(固化剤)は、種々の欠点を有するものである。例
えば、前記(1) 〜(2) のセメント系固化剤及び生石灰系
固化剤においては、建設汚泥を固化することができるも
のの、固化速度が遅かったり、あるいは固化土壌のPH
値が問題になってくる。即ち、前記(1) 〜(2) の固化剤
はアルカリ性の強いものであり、固化土壌を埋立て用に
再利用した場合、生体系に多大の悪影響を与えてしま
う。
The above-mentioned conventional soil conditioners (solidifying agents) have various disadvantages. For example, in the cement-based solidifying agent and the quick-lime-based solidifying agent of the above (1) and (2), although the construction sludge can be solidified, the solidification rate is slow or the PH of the solidified soil is low.
The value becomes a problem. That is, the solidifying agents (1) and (2) have strong alkalinity, and when the solidified soil is reused for landfill, it has a great adverse effect on the biological system.

【0006】また、前記(3) の合成高分子系固化剤の場
合、高価なものであることから多量の建設汚泥を固化し
ようとする場合、経済性に問題がある。更には、前記
(3) の合成高分子系固化剤は、石灰(CaO ・CaCO 3 )を
必須成分としているため、前記したように固化土壌のア
ルカリ性の問題を本来的に内包しているものである。
Further, the synthetic polymer-based solidifying agent of the above (3) is expensive, so that there is a problem in economical efficiency when solidifying a large amount of construction sludge. Further, the above
Since the synthetic polymer solidifying agent (3) has lime (CaO.CaCO 3 ) as an essential component, it inherently includes the problem of alkalinity of solidified soil as described above.

【0007】本発明は、前記した従来技術による土壌改
良剤(土壌固化剤)の欠点及び限界に鑑み創案されたも
のである。本発明者らは、従来より提案されている建設
汚泥用の土壌改良剤の改善について、鋭意検討を加え
た。前記検討過程において、本発明者らは、(i) セッコ
ウ(CaSO4 ・2H2 O )、より正しくは二水セッコウ(結
晶セッコウ)が天然の土壌系に存在し、無公害物質であ
ること、(ii)前記セッコウ(CaSO4 ・2H2 O )、より正
しくは、二水セッコウ(結晶セッコウ)を焼成して調製
した半水セッコウ(CaSO4 ・0.5H2 O )は、急速に吸水
して二水セッコウに変化すること。という化学上の知見
を土壌改良剤に生かすことを考え出した。
The present invention has been made in view of the above-mentioned drawbacks and limitations of the conventional soil conditioner (soil hardener). Means for Solving the Problems The present inventors have intensively studied the improvement of conventionally proposed soil conditioners for construction sludge. In the examination process, the present inventors have found that (i) gypsum (CaSO 4 .2H 2 O), more correctly dihydrate gypsum (crystalline gypsum) is present in a natural soil system and is a non-polluting substance, (ii) Gypsum (CaSO 4 .2H 2 O), or more correctly, semi-water gypsum (CaSO 4 .0.5H 2 O) prepared by firing dihydrate gypsum (crystalline gypsum) absorbs water rapidly. Change to gypsum. We devised to make use of this chemical knowledge as a soil conditioner.

【0008】その結果、本発明者らは、半水セッコウ
(CaSO4 ・0.5H2 O )を含水率の高い建設汚泥の固化剤
に使用した場合、固化速度が速く、かつ十分な固化強度
(十分なコーン指数)をもつ改良土が得られるという知
見を得た。また、前記改良土は、従来技術のように高い
アルカリ性のPH値を持たず、更に通気性や透水性に優
れているため、埋戻し用の土壌として利用することがで
きるという知見を得た。
As a result, the present inventors have found that when hemihydrate gypsum (CaSO 4 .0.5H 2 O) is used as a solidifying agent for construction sludge having a high water content, the solidifying rate is high and sufficient solidifying strength ( It was found that improved soil with a sufficient cone index) can be obtained. Further, it has been found that the improved soil can be used as a soil for backfilling because it does not have a high alkaline PH value as in the prior art and has excellent air permeability and water permeability.

【0009】更にまた、半水セッコウ(CaSO4 ・0.5H2
O )の出発材料である天然産の二水セッコウ(CaSO4
2H2 O )は、産出地の鉱石組成にもよるが、一般には植
物栽培に重要なN(窒素)、P(リン)、K(カリウ
ム)の化合物成分を含むとともに、((カルシウム)、
Mg(マグネシウム)、S(イオウ)などの化合物成分
を含んでいるため、前記半水セッコウで建設汚泥を固化
させて得られる改良土は、植栽用土壌として最適である
という知見を得た。
Furthermore, semi-water gypsum (CaSO 4 .0.5H 2
O) is the starting material for the natural dihydrate gypsum (CaSO 4 ·
2H 2 O) depends on the ore composition of the place of production, but generally contains the compound components of N (nitrogen), P (phosphorus), and K (potassium), which are important for plant cultivation, and ((calcium),
Since the compound components such as Mg (magnesium) and S (sulfur) are contained, it has been found that the improved soil obtained by solidifying the construction sludge with the semi-water gypsum is optimum as the soil for planting.

【0010】本発明は、前記知見をベースにして完成さ
れたものであり、本発明により、含水率の高い建設汚泥
はもとより各種の汚泥(河川・湖沼の汚泥、海洋汚泥、
屎尿汚泥など)を急速に固化することができるととも
に、経済的な半水セッコウ系の含水土壌改良剤(固化
剤)が提供される。
The present invention has been completed based on the above findings, and according to the present invention, not only construction sludge having a high water content but also various sludges (sludge from rivers and lakes, marine sludge,
Human waste sludge) can be rapidly solidified, and an economical semi-hydrated gypsum-based hydrous soil conditioner (solidifying agent) is provided.

【0011】[0011]

【課題を解決するための手段】本発明を概説すれば、本
発明は、含水土壌を固化して土壌改良を図るための含水
土壌改良剤において、前記含水土壌改良剤が、半水セッ
コウ(CaSO4 ・0.5H2O )を主成分として構成されるこ
とを特徴とする半水セッコウ系含水土壌改良剤に関する
ものである。
Means for Solving the Problems To outline the present invention, the present invention relates to a water-containing soil improving agent for solidifying water-containing soil for soil improvement, wherein the water-containing soil improving agent is a semi-water gypsum (CaSO 4 · 0.5H 2 O) be configured as a main component relates hemihydrate gypsum-based water soil improving agent characterized.

【0012】[0012]

【発明の実施の形態】以下、本発明の技術的構成を詳し
く説明する。本発明の含水土壌を固化して土壌改良を図
るための半水セッコウ系含水土壌改良剤は、半水セッコ
ウ(CaSO4 ・0.5H2 O )を主成分として構成されるもの
である。本発明において、前記半水セッコウ(CaSO4
0.5H2 O )は、出発材料である二水セッコウ(結晶石
膏)(CaSO4 ・2H2 O )を60℃〜160℃、好ましく
は100℃〜150℃に加熱処理することにより調製さ
れるものである。本発明において、前記半水セッコウ
(CaSO4 ・0.5H2 O )を調製するための出発材料である
二水セッコウ(結晶石膏)は、天然産のものであっても
よく、あるいは合成品であってもよい。更には、天然産
と合成品の混合物であってもよいものである。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical constitution of the present invention will be described below in detail. The semi-aqueous gypsum-based hydrous soil improving agent for solidifying the hydrous soil of the present invention to improve the soil comprises semi-aqueous gypsum (CaSO 4 · 0.5H 2 O) as a main component. In the present invention, the semi-water gypsum (CaSO 4 ·
0.5H 2 O) is prepared by heating dihydrate gypsum (crystal gypsum) (CaSO 4 · 2H 2 O) as a starting material to 60 ° C to 160 ° C, preferably 100 ° C to 150 ° C. Is. In the present invention, the dihydrate gypsum (crystal gypsum), which is the starting material for preparing the above-mentioned hemihydrate gypsum (CaSO 4 .0.5H 2 O), may be naturally occurring or synthetic. May be. Further, it may be a mixture of natural products and synthetic products.

【0013】一般に、天然産の二水セッコウ(CaSO4
2H2 O )は、産出地にもよるが、植物栽培に重要なN
(窒素)、P(リン)、K(カリウム)の化合物成分を
含むとともに、Ca(カルシウム)、Mg(マグネシウ
ム)、S(イオウ)などの化合物成分を含有するもので
ある。従って、天然産の二水セッコウから調製される半
水セッコウ系土壌改良剤は、前記植栽用の主要成分を含
有しているものである。このため、天然産の二水セッコ
ウから調製される半水セッコウ系土壌改良剤を使用して
建設汚泥などの高含水率土壌を固化させたあとの固化土
壌(改良土)は、植栽用土壌に有用なものとなる。
In general, naturally occurring gypsum (CaSO 4
2H 2 O) is important for plant cultivation, although it depends on the place of origin.
It contains compound components such as (nitrogen), P (phosphorus), and K (potassium), and also contains compound components such as Ca (calcium), Mg (magnesium), and S (sulfur). Therefore, the hemihydrate gypsum-based soil conditioner prepared from naturally produced dihydrate gypsum contains the main component for planting. For this reason, the solidified soil (improved soil) after solidifying high moisture content soil such as construction sludge using a semi-hydrated gypsum-based soil conditioner prepared from naturally produced dihydrate gypsum is converted into planting soil. Will be useful.

【0014】例えば、オーストラリア産の天然二水セッ
コウから調製した半水セッコウ系土壌改良剤は、以下の
元素組成を有するものである(単位は%で表示する)。 N ……… 0.040 (%) S ……… 16.500 P ……… 0.011 Mg ……… 0.055 Ca ……… 22.500 K ……… 0.066 Al ……… 0.079 Fe ……… 0.140
For example, a hemihydrate gypsum-based soil conditioner prepared from natural dihydrate gypsum produced in Australia has the following elemental composition (units are expressed in%). N ... 0.040 (%) S ... 16.500 P ... 0.011 Mg ... 0.055 Ca ... 22.500 K ... 0.066 Al ... 0.079 Fe ... 0.140

【0015】更に、前記した半水セッコウ系土壌改良剤
は、他の微量成分として、以下の元素組成を有するもの
である(単位mg/1000gで表示する)。 Se ……… <4 (mg/1000g) Mo ……… <2 Ni ……… <2 Cu ……… 1.8 Mn ……… 6.0 B ……… 5.0 前記したように、本発明の天然産の二水セッコウから調
製した半水セッコウ系土壌改良剤は、植栽用の重要成分
を含有しているため、改良上の植栽用土壌としての有効
利用という観点からみると、付加価値の高い固化剤とい
うことができる。
Furthermore, the above-mentioned hemihydrate gypsum-based soil conditioner has the following elemental composition as other trace components (expressed in mg / 1000 g). Se ... <4 (mg / 1000g) Mo ... <2 Ni ... <2 Cu ... 1.8 Mn ... 6.0 B ... 5.0 As described above, the book The semi-hydrated gypsum-based soil improver prepared from the naturally produced dihydrate gypsum of the present invention contains an important component for planting, and from the viewpoint of effective use as soil for planting on improvement, It can be called a high value-added solidifying agent.

【0016】本発明の半水セッコウ系土壌改良剤が適用
される含水土壌は、一般には、20〜200%の含水率
を有するものであるが、これに限定されない。前記高含
水率の土壌の典型例は、建設汚泥である。この種の建設
汚泥の固化目標は、公害規制の観点からコーン指数確認
試験(JSF T 716)において、コーン指数=
2.0以上のものが重要な意味を持っている。前記コー
ン指数が2.0未満のものが公害規制の対象となってお
り、建設工事主の責任において完全処理の義務が課せら
れているものである。一方、コーン指数が2.0以上の
ものは、建設現場での埋め戻し用や他の場所へ搬送して
埋立て用などに再利用できるものである。
The hydrated soil to which the semi-aqueous gypsum-based soil improving agent of the present invention is applied generally has a moisture content of 20 to 200%, but is not limited thereto. A typical example of the high water content soil is construction sludge. The solidification target of this type of construction sludge is determined by the cone index confirmation test (JSF T 716) from the viewpoint of pollution control.
Anything above 2.0 is important. Those with a cone index of less than 2.0 are subject to pollution control, and the duty of complete disposal is imposed on the responsibility of the construction work owner. On the other hand, those having a cone index of 2.0 or more can be reused for backfilling at a construction site or for transporting to another place for landfilling.

【0017】前記したように、本発明の半水セッコウ系
土壌改良剤は、高含水率(コーン指数が2.0未満)の
建設汚泥の固化処理に応用されるが、これに限定されな
いものである。例えば、本発明の半水セッコウ系土壌改
良剤は、高含水率の各種の汚泥、より具体的には、河川
や湖沼の汚泥、海洋汚泥、屎尿汚泥などの処理に適用す
ることができるものである。
As described above, the hemihydrate gypsum-based soil improving agent of the present invention is applied to the solidification treatment of construction sludge having a high water content (cone index is less than 2.0), but is not limited thereto. is there. For example, the semi-hydrated gypsum-based soil conditioner of the present invention can be applied to the treatment of various sludges having a high water content, more specifically, sludge of rivers and lakes, marine sludge, and human waste sludge. is there.

【0018】本発明の半水セッコウ系土壌改良剤は、半
水セッコウ(CaSO4 ・0.5H2 O )を主成分として構成さ
れるものである。その他の成分としては、半水セッコウ
を前記したように天然産の二水セッコウ(CaSO4 ・2H2
O )を加熱処理して調製した場合、それに含有される
N,P,Kなどの植栽用に重要な成分であってもよい。
また、生体系への高いPH値による悪影響がでない範囲
において、従来公知のセメント系、石灰系、あるいは合
成高分子系の固化剤を適宜、配合することができるもの
である。また、各種の汚泥への均一分散のために、界面
活性剤を適宜、配合することができるものである。
The semi-aqueous gypsum-based soil improving agent of the present invention comprises semi-aqueous gypsum (CaSO 4 .0.5H 2 O) as a main component. As other ingredients, as described above, the semi-aqueous gypsum is naturally occurring dihydric gypsum (CaSO 4 .2H 2
When O) is prepared by heating, it may be an important component for planting such as N, P, K contained in it.
Further, conventionally known cement-based, lime-based, or synthetic polymer-based solidifying agents can be appropriately blended as long as the biological system is not adversely affected by the high PH value. Further, a surfactant can be appropriately blended for uniform dispersion in various sludges.

【0019】[0019]

【実施例】二水セッコウ(CaSO4 ・2H2 O )を100〜
160℃で加熱処理した半水セッコウ(CaSO4 ・0.5H2
O )を主成分とした半水セッコウ系含水土壌改良剤(粒
径10μm、比重2.59)(以下、固化剤という。)を利
用して、建設汚泥の固化能力を試験した。 (i) <建設汚泥>の性状 建設現場から採集した建設汚泥の性状は以下の通りであ
る。 ・ 含水率(JSF T 121):60% ・ PH値(JSF T 21に準拠)(注1):8.
2〜8.6 ・ コーン指数確認試験(JSF T 716)(注
2):ランマーによる突き固めが不可能。 (注1)建設汚泥はシールド工法を採用している建設現
場より採取されたものであるため、PH値が高いもので
ある。 (注2)10cm×12.7cmモールド、ランマー
2.5kgにて一層当たり10回の突き固めにより3層
を形成し、測定する。
[Example] 100 g of dihydrate gypsum (CaSO 4 .2H 2 O)
Semi-water gypsum (CaSO 4・ 0.5H 2) heat-treated at 160 ℃
The solidifying ability of construction sludge was tested using a semi-hydrated gypsum-based hydrous soil conditioner (particle size 10 μm, specific gravity 2.59) (hereinafter referred to as a solidifying agent) containing O 2 as a main component. (i) Properties of construction sludge The properties of construction sludge collected from the construction site are as follows.・ Moisture content (JSF T121): 60% ・ PH value (based on JSF T21) (Note 1): 8.
2-8.6 ・ Cone index confirmation test (JSF T 716) (Note 2): Compaction with a rammer is not possible. (Note 1) Construction sludge has a high PH value because it is collected from construction sites that employ the shield method. (Note 2) Three layers are formed by tamping 10 times per layer with a 10 cm × 12.7 cm mold and a 2.5 kg rammer to measure.

【0020】(ii)<改良土>の性状、 建設汚泥と固化剤を3分間攪拌し、改良土の性状を調べ
た。なお、固化剤の均一混合のために、以下の実験では
100gの添加水を用いた。 (1) 実験例1 建設汚泥1927.6gに、固化剤202.9 g及び添加水100 g
を添加し、攪拌混合(3分間)し、改良上の性状を調べ
た。なお、固化剤の建設汚泥と添加水の合計量に対する
使用割合は10%である。改良土は、コーン指数2.
0、PH値7.5〜7.8を示した。また、ビーカに水
及び前記改良土を入れ、目視により再泥化を評価したと
ころ再泥化の現象はみられなかった。 (2) 実験例2 建設汚泥2009.1gに、固化剤304.1 g及び添加水100 g
を添加し、攪拌混合(3分間)し、改良上の性上を調べ
た。なお、固化剤の建設汚泥と添加水の合計量に対する
使用割合は15%である。改良上は、コーン指数3.
7、PH値7.5〜7.8を示した。また、両泥化評価
においても再泥化の現象はみられなかった。
(Ii) Properties of <improved soil> The construction sludge and the solidifying agent were stirred for 3 minutes, and the properties of the improved soil were investigated. In order to uniformly mix the solidifying agent, 100 g of added water was used in the following experiments. (1) Experimental Example 1 1927.6 g of construction sludge, 202.9 g of a solidifying agent and 100 g of added water
Was added and mixed with stirring (3 minutes), and the properties for improvement were examined. The use ratio of the solidifying agent to the total amount of the construction sludge and the added water is 10%. The improved soil has a cone index of 2.
0 and a PH value of 7.5 to 7.8 were shown. When water and the improved soil were put in a beaker and re-mudification was visually evaluated, no re-mudification phenomenon was observed. (2) Experimental Example 2 309.1 g of construction sludge, 304.1 g of a solidifying agent and 100 g of added water
Was added, and the mixture was stirred and mixed (3 minutes) and examined for improvement. The use ratio of the solidifying agent to the total amount of the construction sludge and the added water is 15%. For improvement, the cone index is 3.
7, the PH value was 7.5 to 7.8. No re-mudification phenomenon was observed in both mud evaluations.

【0021】[0021]

【発明の効果】本発明の半水セッコウ系含水土壌改良剤
は、従来のセメント系、石灰系、及び合成高分子系の土
壌改良剤(固化剤)に比較して、改良上を調製するため
に要する時間が極めて短く、かつ低価格のため経済的で
ある。また、本発明の半水セッコウ系含水土壌改良剤に
より改良される改良土は、従来のように高いPH値に由
来する生体系への悪影響はなく、安全性の高いものであ
る。更にまた、本発明の半水セッコウ系含水土壌改良剤
により改良される改良土は、通気性、透水性に優れてお
り、かつ、植物の生育において重要な元素を含有したも
のであるため、付加価値の高い植栽用土壌となるもので
ある。
The semi-hydrated gypsum-based hydrous soil conditioner of the present invention is prepared for improvement in comparison with conventional cement-based, lime-based and synthetic polymer-based soil conditioners (solidifying agents). It is economical because the time required for it is extremely short and the price is low. Further, the improved soil improved by the semi-hydrated gypsum-based hydrous soil improving agent of the present invention does not have a bad effect on the biological system due to a high PH value as in the conventional case and is highly safe. Furthermore, the improved soil improved by the semi-hydrated gypsum-based hydrous soil improver of the present invention is excellent in air permeability and water permeability, and contains an important element in plant growth. It will be a valuable planting soil.

【0022】前記したように、本発明の半水セッコウ系
含水土壌改良剤は、昨今における建設汚泥などの高含水
率の各種の汚泥に対する厳しい公害規制をクリアーする
ことが出来るものであり、安全性が高く、かつ経済性に
優れたものである。
As described above, the semi-hydrated gypsum-based hydrous soil conditioner of the present invention is capable of clearing strict pollution regulations for various sludges having a high water content such as construction sludge in recent years and is safe. It has a high price and is highly economical.

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 含水土壌を固化して土壌改良を図るため
の含水土壌改良剤において、前記含水土壌改良剤が、半
水セッコウ(CaSO4 ・0.5H2 O )を主成分として構成さ
れることを特徴とする半水セッコウ系含水土壌改良剤。
1. A hydrated soil improving agent for solidifying hydrated soil for soil improvement, wherein the hydrated soil improving agent is composed mainly of hemihydrate gypsum (CaSO 4 .0.5H 2 O). A semi-hydrated gypsum-based hydrous soil conditioner characterized by:
【請求項2】 半水セッコウ系含水土壌改良剤の主成分
である半水セッコウ(CaSO4 ・0.5H2 O )が、結晶セッ
コウ(CaSO4 ・2H2 O )を100℃〜160℃で熱処理
して調製されたものである請求項1に記載の半水セッコ
ウ系含水土壌改良剤。
2. The semi-hydrated gypsum (CaSO 4 .0.5H 2 O), which is the main component of the semi-hydrated gypsum-based hydrous soil conditioner, heats the crystalline gypsum (CaSO 4 .2H 2 O) at 100 ° C. to 160 ° C. The hemihydrate gypsum-based hydrous soil conditioner according to claim 1, which is prepared by
【請求項3】 含水土壌が、20〜200%の含水率を
有するものである請求項1に記載の半水セッコウ系含水
土壌改良剤。
3. The hemihydrate gypsum-based water-containing soil conditioner according to claim 1, wherein the water-containing soil has a water content of 20 to 200%.
【請求項4】 含水土壌が、建設汚泥である請求項1に
記載の半水セッコウ系含水土壌改良剤。
4. The semi-hydrated gypsum-based hydrous soil conditioner according to claim 1, wherein the hydrous soil is construction sludge.
【請求項5】 建設汚泥のコーン指数が、2未満のもの
である請求項4に記載の半水セッコウ系含水土壌改良
剤。
5. The hemihydrate gypsum-based hydrous soil conditioner according to claim 4, wherein the corn index of the construction sludge is less than 2.
JP7308495A 1995-11-02 1995-11-02 Water-containing soil conditioner composed of gypsum hemihydrate Pending JPH09125060A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7308495A JPH09125060A (en) 1995-11-02 1995-11-02 Water-containing soil conditioner composed of gypsum hemihydrate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7308495A JPH09125060A (en) 1995-11-02 1995-11-02 Water-containing soil conditioner composed of gypsum hemihydrate

Publications (1)

Publication Number Publication Date
JPH09125060A true JPH09125060A (en) 1997-05-13

Family

ID=17981707

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7308495A Pending JPH09125060A (en) 1995-11-02 1995-11-02 Water-containing soil conditioner composed of gypsum hemihydrate

Country Status (1)

Country Link
JP (1) JPH09125060A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005232285A (en) * 2004-02-19 2005-09-02 Ishihara Sangyo Kaisha Ltd Soil modifying material
JP2006249374A (en) * 2005-03-14 2006-09-21 Denki Kagaku Kogyo Kk Solidifying material, solidified article using the same, and soil improving method
JP2009214083A (en) * 2008-03-13 2009-09-24 Institute Of National Colleges Of Technology Japan Soil solidifying agent and solidifying method of soil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005232285A (en) * 2004-02-19 2005-09-02 Ishihara Sangyo Kaisha Ltd Soil modifying material
JP2006249374A (en) * 2005-03-14 2006-09-21 Denki Kagaku Kogyo Kk Solidifying material, solidified article using the same, and soil improving method
JP4619837B2 (en) * 2005-03-14 2011-01-26 電気化学工業株式会社 Solidified material, solidified body using the same, and soil improvement method
JP2009214083A (en) * 2008-03-13 2009-09-24 Institute Of National Colleges Of Technology Japan Soil solidifying agent and solidifying method of soil

Similar Documents

Publication Publication Date Title
US4443260A (en) Method for strengthening soft soil
US4124405A (en) Process for solidifying aqueous wastes and products thereof
US4028130A (en) Disposal method and use of sewage sludge
US4375986A (en) Process for treating liquids wastes possessing a strong acidity
US4518508A (en) Method for treating wastes by solidification
US20070272609A1 (en) Reuse of waste materials via manure additive
JPH08333571A (en) Surplus soil solidification agent and solidification method
Ooi et al. Treated effluent in concrete technology
JP2002088362A (en) Setting agent for soil
JP3824844B2 (en) Improving material for solidifying / neutralizing mud substances and method for solidifying / neutralizing mud substances
US4504321A (en) Process for treating and stabilizing chromium ore waste
JP2000176493A (en) Sludge solidifying material and solidifying treatment
JP4663999B2 (en) Soil neutral solidification material and soil neutral solidification improvement method
JPH09125060A (en) Water-containing soil conditioner composed of gypsum hemihydrate
JP2008255171A (en) Fixing agent for inorganic harmful component
JPH101667A (en) Semihydrated gypsum agent for improving water-containing soil
JP4380154B2 (en) Solidification method of mud
JP3877583B2 (en) Hexavalent chromium reducing material
JP2736097B2 (en) Detoxification method of industrial waste containing hazardous heavy metals
JP2897476B2 (en) Aqueous soil conditioner
RU2807336C1 (en) Method for producing inert soil
JPH07179854A (en) Solidifying agent for soft ground and method of stabilizing soft ground
JPH02245088A (en) Material for foundation strengthening and soil conditioning
JP4174818B2 (en) Granulated soil
JPH0217228B2 (en)

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20040319

A131 Notification of reasons for refusal

Effective date: 20040427

Free format text: JAPANESE INTERMEDIATE CODE: A131

A601 Written request for extension of time

Effective date: 20040727

Free format text: JAPANESE INTERMEDIATE CODE: A601

A602 Written permission of extension of time

Effective date: 20040803

Free format text: JAPANESE INTERMEDIATE CODE: A602

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20041221