JP3536931B2 - Soft soil strength improving additive and method for improving soft soil strength - Google Patents
Soft soil strength improving additive and method for improving soft soil strengthInfo
- Publication number
- JP3536931B2 JP3536931B2 JP01950294A JP1950294A JP3536931B2 JP 3536931 B2 JP3536931 B2 JP 3536931B2 JP 01950294 A JP01950294 A JP 01950294A JP 1950294 A JP1950294 A JP 1950294A JP 3536931 B2 JP3536931 B2 JP 3536931B2
- Authority
- JP
- Japan
- Prior art keywords
- soft soil
- strength
- improving
- weight
- slag
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
- C04B28/14—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 calcium sulfate 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
Landscapes
- 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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、地盤を強化するためな
どに適用できる軟弱土強度改善添加材及び軟弱土の強度
改善方法に関し、特に経済的でしかも任意の強度を与え
る軟弱土強度改善添加材及び軟弱土の強度改善方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an additive for improving the strength of soft soil and a method for improving the strength of soft soil which can be used for strengthening the ground and the like. The present invention relates to a method for improving the strength of wood and soft soil.
【０００２】[0002]
【従来の技術】従来から、地盤を強化するためなどにお
ける軟弱土の改良方法に関しては、セメント系、石灰系
等の改良材料を用いた方法が知られている。この改良方
法は、無機質軟弱土の改良には簡便でしかも効果が大き
いとして最近普及している。また、有機質軟弱土にはこ
の改良方法では十分にその改良がなされないとして、酸
性であり、かつ有機質成分の含有量が高い有機質軟弱土
に適した方法が検討され、その１つとして、例えば、特
開昭５４−１３５４０９号公報には、高炉急冷スラグ微
粉末よりなる主材料（イ）と、ポルトランド・セメント
及び塩化カルシウムよりなる硬化促進材（ロ）とを含む
改良材料を有機質軟弱土と混合処理することにより有機
質軟弱土を改良する方法が提案されている。この方法
は、有機質軟弱土が酸性であるため、アルカリ性の物質
であり、かつそれ自体も硬化する高炉急冷スラグ微粉末
が有効である等の点から、改良効果が高いといわれてい
る。2. Description of the Related Art Heretofore, as a method for improving soft soil for strengthening the ground, a method using an improved material such as a cement type or a lime type is known. This improvement method has recently been widely used because it is simple and effective in improving inorganic soft soil. Further, it is considered that a method suitable for an organic soft soil which is acidic and has a high content of an organic component is studied as an organic soft soil which is not sufficiently improved by this improvement method. As one of the methods, for example, Japanese Patent Application Laid-Open No. 54-135409 discloses that an improved material containing a main material (a) made of blast-furnace quenched slag fine powder and a hardening accelerator made of portland cement and calcium chloride (b) is made of an organic soft soil. A method for improving an organic soft soil by performing a mixing treatment has been proposed. This method is said to have a high improvement effect in that the blast furnace quenched slag fine powder, which is an alkaline substance and hardens itself, is effective because the organic soft soil is acidic.
【０００３】さらに、含水軟弱土及び汚泥に対して早期
にその強度を増加する改良方法として、特開昭５７−３
０５９９号公報には、含水軟弱土又は汚泥に、２水石膏
と、半水石膏及び／又は可溶性無水石膏と、微細急冷高
炉滓と、ポルトランドセメントを添加混合することから
なり、それらの添加剤の乾燥重量割合は、２水石膏と半
水石膏及び／又は可溶性無水石膏の総和量５〜３５％
（石膏総和量に対する２水石膏含量は４０〜９５モル％
及び半水石膏及び／又は可溶性無水石膏含量は６０〜５
モル％である）、微細急冷高炉滓３０〜７０％及びポル
トランドセメント２５〜５０％である改良方法が提案さ
れている。この方法は、強度の改良が早期に得られるも
のである。Further, as an improved method for increasing the strength of a hydrated soft soil and sludge at an early stage, Japanese Patent Application Laid-Open No.
No. 0599 discloses a method of adding and mixing dihydrate gypsum, hemihydrate gypsum and / or soluble anhydrous gypsum, fine quenched blast furnace slag, and Portland cement to hydrous soft soil or sludge. The dry weight ratio is 5 to 35% of the total amount of gypsum dihydrate, gypsum hemihydrate and / or soluble anhydrite.
(The content of gypsum dihydrate with respect to the total amount of gypsum is 40 to 95 mol%
Gypsum and / or soluble anhydrite content is 60-5
Mol%), 30-70% finely quenched blast furnace slag and 25-50% Portland cement. In this method, improvement in strength is obtained at an early stage.
【０００４】[0004]
【発明が解決しようとする課題】これらの方法は、軟弱
土を改良する上で有効であるが、まだ技術的にもまたコ
スト的にも不十分なものである。例えば、前記の特開昭
５４−１３５４０９号公報の方法は、改良材料の主成分
である高炉急冷スラグ微粉末が、アルカリ又は硫酸塩な
どの刺激作用によって、ガラス成分の水への溶解が進
み、この際に高炉急冷スラグ中の可溶性成分が溶出し、
結晶水を多量に取り込むカルシウム・シリケート、エト
リンガイド、石膏等の水和物を生成し、強度を発揮する
関係などから、その反応を十分行わせるためには、その
粒度がなるべく小さい方がよいということで、通常塊状
で得られる高炉急冷スラグを微細に粉砕しなければなら
ない。このことは、その粉砕工程にかなりのコストを要
することになる。このようなコストの上昇は、多量に使
用され、なるべく低いコストに抑えなければならない改
良工事には重大な問題である。Although these methods are effective in improving soft soil, they are still insufficient in technical and cost aspects. For example, in the method disclosed in Japanese Patent Application Laid-Open No. 54-135409, the blast furnace quenched slag fine powder, which is a main component of the improved material, dissolves the glass component in water by stimulating action such as alkali or sulfate. At this time, the soluble components in the blast furnace quenched slag elute,
In order to produce hydrates such as calcium silicate, ethrin guide, and gypsum that take in a large amount of water of crystallization and exhibit strength, the particle size should be as small as possible to perform the reaction sufficiently. Therefore, the blast furnace quenched slag which is usually obtained in a lump must be finely pulverized. This results in a considerable cost for the grinding process. Such an increase in cost is a serious problem for improvement works that are used in large quantities and must be kept at the lowest possible cost.
【０００５】また、もう１つの特開昭５７−３０５９９
号公報の改良方法においても、微細急冷高炉滓を使用
し、これが前記の方法と同様な作用を利用する関係で、
やはり急冷高炉滓の粉砕工程によりコストが上昇する問
題があり、しかもこの方法では目的とする強度の増大に
ついて、一軸圧縮強さが十分に高くならないという問題
がある。例えば、２水石膏と半水石膏のモル比が４０／
６０の場合において、２４時間後の一軸圧縮強さが０．
９７ｋｇ／ｃｍ2 と、約１ｋｇ／ｃｍ2 程度であって、
改良の効果が十分高いものではない。本発明は、このよ
うな問題を解決し、経済的でしかも任意の強度を有する
軟弱土強度改善添加材及び軟弱土の強度改善方法を得る
ことを目的とするものである。さらに、本発明は、強度
を十分与えることができる軟弱土強度改善添加材及び軟
弱土の強度改善方法を得ることを目的とするものであ
る。[0005] Another Japanese Patent Application Laid-Open No. Sho 57-30599.
In the improvement method of the publication, also using a fine quenched blast furnace slag, because this utilizes the same action as the above method,
Again, there is a problem that the cost increases due to the step of pulverizing the rapidly cooled blast furnace slag, and furthermore, this method has a problem that the uniaxial compressive strength is not sufficiently increased with respect to the intended increase in strength. For example, the molar ratio of gypsum dihydrate and gypsum hemihydrate is 40 /
In the case of No. 60, the uniaxial compressive strength after 24 hours was 0.1.
97 kg / cm 2 and about 1 kg / cm 2 ,
The effect of the improvement is not high enough. An object of the present invention is to solve such a problem and to obtain a soft soil strength improving additive which is economical and has arbitrary strength and a method for improving the strength of soft soil. Further, another object of the present invention is to provide a soft soil strength improving additive and a soft soil strength improving method which can provide sufficient strength.
【０００６】[0006]
【課題を解決するための手段】本発明は、優れた軟弱土
の強度改善方法について研究した結果、下記の手段によ
って前記の目的を達成することができた。
（１）塩基度［（ＣａＯ＋Ａｌ２Ｏ３）／ＳｉＯ２］が
０．６未満であるフェロニッケルスラグが５０〜８０重
量％、消石灰又は生石灰が１４〜３５重量％、及び焼石
膏６〜１５重量％よりなり、合計で１００％となるを特
徴とする軟弱土強度改善添加材。
（２）塩基度［（ＣａＯ＋Ａｌ ２Ｏ ３）／ＳｉＯ ２］が
０．６未満であるフェロニッケルスラグが５０〜８０重
量％、消石灰又は生石灰が１４〜３５重量％、及び焼石
膏６〜１５重量％よりなり、合計で１００％よりなる軟
弱土強度改善添加材を軟弱土と混合処理することを特徴
とする軟弱土の強度改善方法。 According to the present invention, as a result of research on an excellent method of improving the strength of a soft soil, the above-mentioned object has been achieved by the following means. (1) basicity ferronickel slag [(CaO + Al 2 O 3 ) / SiO 2] is less than 0.6 50-80 fold
%, Slaked lime or quicklime is 14 to 35% by weight, and calcined stone
A soft soil strength improving additive comprising 6 to 15% by weight of plaster and a total of 100% . (2) Basicity [(CaO + Al 2 O 3 ) / SiO 2 ]
Ferronickel slag less than 0.6 is 50-80 weight
%, Slaked lime or quicklime is 14 to 35% by weight, and calcined stone
6 to 15% by weight of plaster, soft total of 100%
Characterized by mixing weak soil strength improvement additive with soft soil
To improve the strength of soft soil.
【０００７】本発明においては、フェロニッケルスラ
グ、消石灰又は生石灰、及び焼石膏の混合物を軟弱土の
ための強度改善添加材とする。この「フェロニッケルス
ラグ」とは、Ｎｉ鉱石を粉砕し、ペレット状とした後、
半溶融状態で還元材（例えば炭材）によってＮｉ酸化物
からフェロニッケルを製造するとき副生されるスラグを
いうものである。その成分範囲を第１表に示す。In the present invention, a mixture of ferronickel slag, slaked lime or quicklime, and calcined gypsum is used as a strength improving additive for soft soil. This "ferronickel slag" refers to the pulverization of Ni ore into pellets,
It refers to slag that is by-produced when ferro-nickel is produced from Ni oxide by a reducing material (for example, a carbon material) in a semi-molten state. The component ranges are shown in Table 1.
【０００８】[0008]
【表１】 [Table 1]
【０００９】フェロニッケルスラグは、粉砕された状態
で本発明に用いられるが、その粒度は細かい方が好まし
い。何故ならば、このフェロニッケルスラグが水硬性組
成物の結合を促進するためには、より高い表面エネルギ
ーを有する微細粒が多い方が好ましい。本発明において
は、粒度０．２５０ｍｍ以下のものが１００％のとき、
その効果を良く発揮する。このフェロニッケルスラグ
は、本発明においては次のような作用をもつ。すなわ
ち、軟弱土の改良材として用いるには、水硬特性を有す
ることが必要であり、それは塩基度と強い相関関係があ
る。塩基度〔（ＣａＯ＋ＭｇＯ＋Ａｌ2 Ｏ3 ）／ＳｉＯ
2 〕が３以上の製鋼スラグが優れているとされている。
しかし、フェロニッケルスラグの成分では、塩基度はせ
いぜい０．６止まりであって、これ単独では十分な水硬
性を与えることはできない。The ferronickel slag is used in the present invention in a pulverized state, and it is preferable that its particle size is fine. This is because, in order for the ferronickel slag to promote the bonding of the hydraulic composition, it is preferable that the number of fine particles having a higher surface energy is large. In the present invention, when the particle size of 0.250 mm or less is 100%,
We show the effect well. This ferronickel slag has the following effects in the present invention. That is, in order to use as a soft soil improving material, it is necessary to have hydraulic properties, which have a strong correlation with basicity. Basicity [(CaO + MgO + Al 2 O 3 ) / SiO
2 ] is said to be excellent in steelmaking slag of 3 or more.
However, in the component of ferronickel slag, the basicity is at most 0.6, and this alone cannot provide sufficient hydraulic property.
【００１０】本発明において、前記強度改善添加材に添
加される消石灰又は生石灰は、この不十分なフェロニッ
ケルスラグの塩基度を向上させることができると共に、
これらから形成される組成物の水硬性を促進する作用を
有する。すなわち、その作用は、ＣａＯ及びＳｉＯ2 の
複合鉱物相、いわゆるカルシウムシリケート（ＣａＳｉ
Ｏ3 ）の水和反応が促進させるものである。また、前記
強度改善添加材に添加される焼石膏は、水と混練すると
速やかに凝結硬化し、その際僅かに膨張する特徴を有す
る。その膨張は、いずれの方向にも等しく膨張するが、
ある方向に抵抗があればその方向の膨張は小さくなり、
その分だけ他の方向に膨張するようなことはない。それ
故、荷重を掛ける効果は、膨張を抑制し、圧縮強度は大
となる。さらに、焼石膏中の酸イオン（ＳＯ4 -2）は、
強度促進剤としての効果が大である。In the present invention, slaked lime or quick lime added to the strength improving additive can improve the basicity of the insufficient ferronickel slag,
It has the effect of promoting the hydraulic properties of the composition formed therefrom. That is, its action is a composite mineral phase of CaO and SiO 2 , so-called calcium silicate (CaSi
O 3 ) promotes the hydration reaction. Further, the calcined gypsum added to the strength improving additive has a feature that when it is kneaded with water, it quickly sets and hardens, and then slightly expands. The expansion expands equally in any direction,
If there is resistance in a certain direction, the expansion in that direction will be small,
There is no expansion in the other direction. Therefore, the effect of applying a load suppresses expansion and increases the compressive strength. Further, the acid ion (SO 4 -2 ) in the plaster of Paris is
The effect as a strength promoter is great.
【００１１】前記の各成分の好ましい割合としては、フ
ェロニッケルスラグが５０〜８０重量％、消石灰又は生
石灰が１４〜３５重量％、及び焼石膏６〜１５重量％よ
りなり、合計で１００％となるものである。この強度改
善添加材におけるフェロニッケルスラグの割合が少ない
と、供試体の一軸圧縮強度は、養生日数の増加に伴い著
しく増加するが、強度改善添加材としてのコストが増す
という問題があり、またその割合が多いと、強度改善添
加材としてのコストが低減するという効果に結びつく
が、供試体の一軸圧縮強度は、養生日数の増加に伴い増
加するものの、その増加率が低下してくるという問題が
ある。一方、消石灰又は生石灰の割合が少ないと、フェ
ロニッケルスラグの水硬特性が十分引き出せないという
問題があり、また多いと未反応の消石灰又は生石灰が水
硬性組成物中に残存するという問題がある。[0011] Preferred ratios of the components of the are off
50 to 80% by weight of ferro-nickel slag, slaked lime or raw
Lime is 14-35% by weight and calcined gypsum 6-15% by weight
Thus, the total is 100% . When the proportion of ferronickel slag in the strength improving additive is small, the uniaxial compressive strength of the test specimen increases remarkably with the number of curing days, but there is a problem that the cost as the strength improving additive increases. If the ratio is high, the cost as a strength improving additive is reduced, but the uniaxial compressive strength of the specimen increases with the number of curing days, but the rate of increase decreases. is there. On the other hand, if the proportion of slaked lime or quick lime is small, there is a problem that the hydraulic characteristics of ferronickel slag cannot be sufficiently drawn out, and if it is too large, there is a problem that unreacted slaked lime or quick lime remains in the hydraulic composition.
【００１２】焼石膏の割合が少ないと、供試体の一軸圧
縮強度の増加率は、低下してくるという問題があり、ま
た多いと一定割合以上では一軸圧縮強度は変化しなくな
るという問題がある。そして、これらの混合物を強度改
善添加材として軟弱土に添加・混合する際においては、
それの軟弱土に対する添加割合は、強度改善添加材が全
体の１〜９５重量％の割合とすることが好ましい。強度
改善添加材の割合が少ないと、供試体の一軸圧縮強度は
低下し、また多いと、供試体の一軸圧縮強度は増大する
が、対象土の体積増加という問題がある。If the ratio of calcined gypsum is small, there is a problem that the rate of increase in the uniaxial compressive strength of the specimen decreases, and if it is too large, there is a problem that the uniaxial compressive strength does not change at a certain ratio or more. And when adding and mixing these mixtures to soft soil as strength improving additives,
It is preferable that the ratio of the strength improving additive to the soft soil is 1 to 95% by weight of the whole. If the proportion of the strength improving additive is small, the uniaxial compressive strength of the specimen decreases, and if it is large, the uniaxial compressive strength of the specimen increases, but there is a problem that the volume of the target soil increases.
【００１３】[0013]
【作用】本発明においては、フェロニッケルスラグ、消
石灰又は生石灰、及び焼石膏よりなる強度改善添加材を
軟弱土に添加・混合することにより軟弱土の強度が改善
される。このフェロニッケルスラグは、消石灰又は生石
灰の添加により塩基度が向上して、その水硬性が促進さ
れる。フェロニッケルスラグは、その水硬性を大きくす
る上で、その粒度が細かい方がよい。粒度０．２５０ｍ
ｍ以下のものが１００％のとき、その効果を良く発揮す
る。また、焼石膏の添加は、それが軟弱土の水分により
速やかに凝結硬化する際に僅かに膨張し、圧縮強度を大
にする作用を伴う。In the present invention, the strength of the soft soil is improved by adding and mixing a strength improving additive consisting of ferronickel slag, slaked lime or quick lime, and calcined gypsum to the soft soil. The basicity of this ferronickel slag is improved by the addition of slaked lime or quick lime, and its hydraulic property is promoted. The ferro-nickel slag preferably has a small particle size in order to increase the hydraulic property. Particle size 0.250m
When the ratio is 100% or less, the effect is well exhibited. Further, the addition of calcined gypsum is accompanied by the action of slightly expanding when it rapidly sets and hardens due to the moisture of the soft soil, thereby increasing the compressive strength.
【００１４】[0014]
【実施例】以下、実施例により本発明を具体的に説明す
る。ただし、本発明はこの実施例のみに限定されるもの
ではない。
実施例１
フェロニッケルスラグ、消石灰又は生石灰、及び焼石膏
を混合して強度改善添加材を構成した。この場合、本発
明について、消石灰又は生石灰、及び焼石膏の混合割合
に関しては、（消石灰又は生石灰：焼石膏）＝７：３と
固定したものを用い、これに対するフェロニッケルスラ
グの混合割合を変えたものとした。また、比較例とし
て、その混合割合を変えたものを構成した。これらの混
合割合を第２表に示す。なお、ここで用いたフェロニッ
ケルスラグの粒度は、０．２５０ｍｍ以下のものであ
る。The present invention will be described below in detail with reference to examples. However, the present invention is not limited to only this embodiment. Example 1 Ferronickel slag, slaked lime or quicklime, and calcined gypsum were mixed to form a strength improving additive. In this case, in the present invention, with respect to the mixing ratio of slaked lime or quick lime and calcined gypsum, a mixture fixed with (slaked lime or quick lime: calcined gypsum) = 7: 3 was used, and the mixing ratio of ferronickel slag was changed. It was taken. Further, as a comparative example, one in which the mixing ratio was changed was configured. Table 2 shows these mixing ratios. The particle size of the ferronickel slag used here is 0.250 mm or less.
【００１５】[0015]
【表２】 [Table 2]
【００１６】第２表に示すＡ〜Ｋの強度改善添加材を軟
弱土とを第３表に示す割合で混合した。この混合物につ
いて強度を測定したが、その測定は７日目の強度につい
て行った（７日強度）。７日強度の試験方法は次のとお
りである。
（１）先ず自然含水比の状態の軟弱土に対し、粉体のフ
ェロニッケルスラグ、消石灰及び焼石膏がそのままの状
態のものを加えて練り混ぜ、次いでこの混練物を直径５
０ｍｍ、高さ１００ｍｍの鋳物製のモールド内に気泡を
巻き込まないように充填して固め、その後、２０℃、湿
度９５％以上の飽和湿潤状態である養生室内で２４時間
養生してから、端面を整形し、脱型して、供試体を作成
し、（２）得られた供試体の脱型直後の直径と高さ及び
重量を測定し、その後、２０℃、飽和湿潤状態にて所要
期間養生し、（３）そして、この養生後に供試体の一軸
圧縮強度を測定した。
なお、一軸圧縮強度試験は、ＪＩＳ Ａ１２１６に準拠
して実施した。その試験結果を第３表に示す。The strength improving additives A to K shown in Table 2 were mixed with soft soil in the proportions shown in Table 3. The strength was measured for this mixture, and the measurement was performed for the strength on day 7 (7-day strength). The 7-day strength test method is as follows. (1) First, powdered ferronickel slag, slaked lime and calcined gypsum are added to a soft soil in a state of a natural water content, and the mixture is kneaded.
0 mm, a mold made of casting having a height of 100 mm is filled with air bubbles so as not to be caught therein, and is hardened. After curing in a curing room at 20 ° C. and a humidity of 95% or more in a saturated wet state, the end face is removed. After shaping and demolding, a specimen is prepared. (2) The diameter, height and weight of the obtained specimen immediately after demolding are measured, and then cured at 20 ° C. in a saturated wet state for a required period of time. (3) And after this curing, the uniaxial compressive strength of the test specimen was measured. The uniaxial compression strength test was performed according to JIS A1216. Table 3 shows the test results.
【００１７】[0017]
【表３】 [Table 3]
【００１８】また、図１には、（消石灰又は生石灰）：
焼石膏＝７：３の割合とし、フェロニッケルスラグとの
割合を種々変化させた強度改善添加材を、軟弱土：強度
改善添加材＝９：１の割合で混合したときの圧縮強度の
変化（７日強度）を示す。これによれば、フェロニッケ
ルスラグと（消石灰又は生石灰、焼石膏）の割合を変化
させることにより、所望の強度を得ることが可能にな
る。FIG. 1 shows (slaked lime or quick lime):
Change in compressive strength when a calcined gypsum = 7: 3 ratio and a strength improving additive with various ratios to ferronickel slag mixed at a ratio of soft earth: strength improving additive = 9: 1 ( 7 days intensity). According to this, a desired strength can be obtained by changing the ratio of ferronickel slag and (slaked lime or quicklime, calcined gypsum).
【発明の効果】本発明によれば、従来利用価値のなかっ
たフェロニッケルスラグを用い、かつ安価な消石灰や焼
石膏を使用しているため、経済的に軟弱土の強度を改善
することができ、しかもその際任意の強度を有するよう
にすることができる。According to the present invention, the strength of soft soil can be improved economically because ferronickel slag, which had no utility value, and inexpensive slaked lime or calcined gypsum are used. In addition, at that time, it is possible to have an arbitrary strength.
【図１】軟弱土に対する本発明の強度改善添加材の添加
率による強度変化（７日強度）を表わすグラフを示す。FIG. 1 is a graph showing a change in strength (7-day strength) according to the addition ratio of a strength improving additive of the present invention to soft soil.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭54−112507（ＪＰ，Ａ) 特開 平６−1975（ＪＰ，Ａ) 特開 昭52−151212（ＪＰ，Ａ) 特開 昭60−69185（ＪＰ，Ａ) 特開 昭54−18113（ＪＰ，Ａ) 特開 昭55−155086（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C09K 17/00 - 17/52 E02D 3/12 C09K 103:00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-112507 (JP, A) JP-A-6-1975 (JP, A) JP-A-52-151212 (JP, A) JP-A-60-1985 69185 (JP, A) JP-A-54-18113 (JP, A) JP-A-55-155086 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C09K 17/00-17 / 52 E02D 3/12 C09K 103: 00
Claims (2)
Ｏ２］が０．６未満であるフェロニッケルスラグが５０
〜８０重量％、消石灰又は生石灰が１４〜３５重量％、
及び焼石膏６〜１５重量％よりなり、合計で１００％と
なるを特徴とする軟弱土強度改善添加材。1. Basicity [(CaO + Al 2 O 3 ) / Si
Ferronickel slag O 2] is less than 0.6 50
-80% by weight, slaked lime or quicklime is 14-35% by weight,
And 6-15% by weight of plaster of Paris, totaling 100%
Soft soil strength improving additive characterized by becoming .
Ｏ ２］が０．６未満であるフェロニッケルスラグが５０
〜８０重量％、消石灰又は生石灰が１４〜３５重量％、
及び焼石膏６〜１５重量％よりなり、合計で１００％よ
りなる軟弱土強度改善添加材を軟弱土と混合処理するこ
とを特徴とする軟弱土の強度改善方法。 2. Basicity [(CaO + Al 2 O 3 ) / Si
O 2 ] is less than 0.6.
-80% by weight, slaked lime or quicklime is 14-35% by weight,
And 6-15% by weight of plaster of Paris, 100% in total
Mixed with the soft soil
And a method for improving the strength of soft soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01950294A JP3536931B2 (en) | 1994-02-16 | 1994-02-16 | Soft soil strength improving additive and method for improving soft soil strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01950294A JP3536931B2 (en) | 1994-02-16 | 1994-02-16 | Soft soil strength improving additive and method for improving soft soil strength |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07228869A JPH07228869A (en) | 1995-08-29 |
| JP3536931B2 true JP3536931B2 (en) | 2004-06-14 |
Family
ID=12001156
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01950294A Expired - Fee Related JP3536931B2 (en) | 1994-02-16 | 1994-02-16 | Soft soil strength improving additive and method for improving soft soil strength |
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| Country | Link |
|---|---|
| JP (1) | JP3536931B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4730689B2 (en) * | 2006-09-19 | 2011-07-20 | 日本国土開発株式会社 | Waste landfill structure, slag sand for fine-grained layer of waste landfill structure, and production method thereof |
| KR101108336B1 (en) * | 2009-06-18 | 2012-01-25 | 주식회사 효석 | A process of an improved soil fertilizer which use ferronickel slag |
| CN115572129A (en) * | 2022-10-14 | 2023-01-06 | 福建省交通规划设计院有限公司 | Low-cost cement soil material with high impact resistance and preparation method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52151212A (en) * | 1976-06-11 | 1977-12-15 | Kobe Steel Ltd | Improving and reinforcing method of poor subsoil with burnt lime and burnt gypsum |
| JPS5418113A (en) * | 1977-07-12 | 1979-02-09 | Sumitomo Metal Ind | Material of improving ground |
| JPS54112507A (en) * | 1978-02-22 | 1979-09-03 | Nippon Hodo | Method of soil stabilizing construction |
| JPS55155086A (en) * | 1979-05-24 | 1980-12-03 | Sumitomo Metal Ind Ltd | Ground conditioner |
| JPS6069185A (en) * | 1983-09-27 | 1985-04-19 | Toagosei Chem Ind Co Ltd | Grout for stabilization of ground |
| JPH061975A (en) * | 1992-06-22 | 1994-01-11 | Daido Gakuen | Hydraulic composition for improving soil property |
-
1994
- 1994-02-16 JP JP01950294A patent/JP3536931B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07228869A (en) | 1995-08-29 |
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