JPH10273662A - Solidifying material for water-containing soil and solidification and improvement of water-containing soil - Google Patents
Solidifying material for water-containing soil and solidification and improvement of water-containing soilInfo
- Publication number
- JPH10273662A JPH10273662A JP7858097A JP7858097A JPH10273662A JP H10273662 A JPH10273662 A JP H10273662A JP 7858097 A JP7858097 A JP 7858097A JP 7858097 A JP7858097 A JP 7858097A JP H10273662 A JPH10273662 A JP H10273662A
- Authority
- JP
- Japan
- Prior art keywords
- soil
- water
- gypsum
- solidifying material
- cement
- 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
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、含水土壌の固化材
およびそれを使用する含水土壌の固化改良方法に関す
る。TECHNICAL FIELD The present invention relates to a solidifying material for hydrous soil and a method for improving solidification of hydrous soil using the same.
【０００２】[0002]
【従来の技術】軟弱土壌の土質改良には、固化材を使用
する固化処理が施される。また、軟弱土壌地域の改良利
用でなく、その地域の土木工事等に伴って発生する含水
残土を搬出する場合にも、流動性が高いことからそのま
までの搬送が困難であり、固化剤を使用して固化処理を
施した後、搬出する必要がある。何れの目的において
も、固化材には、固化後の土壌が目的に合った十分な強
度を有していること、適度の固化速度を有しているこ
と、固化材が化学的に安定であり有害物質が溶出しない
こと等の特性が要求されるが、これ等複数機能を要求さ
れる固化材として既に多くの技術が開示されている。こ
れ等は、含まれる水硬性成分の種によってセメント系と
石膏系に大別できるが、セメント系は強度は得られるも
のの、セメント自体が強アルカリであるため固化後土壌
の高ｐＨ値が問題となり、一方、石膏系は、中性である
ためｐＨ値的には問題ないものの、改良後土壌が十分な
強度を示さないと云う問題がある。2. Description of the Related Art To improve the soil quality of soft soil, a solidification treatment using a solidifying material is performed. In addition, it is difficult to transport hydrated residual soil generated due to civil engineering work in that area instead of improving it in soft soil areas because it is difficult to transport it as it is because of its high fluidity. After solidification treatment, it is necessary to carry it out. For any purpose, the solidified material must be such that the soil after solidification has sufficient strength for the purpose, has an appropriate solidification rate, and the solidified material is chemically stable. Although properties such as harmful substances are not required to be eluted, many techniques have already been disclosed as a solidifying material that requires a plurality of functions. These can be broadly classified into cement and gypsum based on the type of hydraulic component contained.However, although cement can provide strength, the cement itself is a strong alkali and the high pH value of the soil after solidification becomes a problem. On the other hand, although the gypsum system is neutral and has no problem in pH value, it has a problem that the soil after improvement does not show sufficient strength.
【０００３】この問題を解決するために、セメント、石
膏双方を成分とし、両系の長所を活かそうとする固化材
が幾つか提案されている。例えば、特開平８−３０２３
４６号および特開平８−３１１４４６号の各公報には、
半水石膏、セメントおよび石灰、高炉スラグ等の混合材
より成る固化材が開示され、特開平６−２２０４５１号
公報には、石膏、ポルトランドセメントおよび硫酸アル
ミニウムより成る固化材が開示されている。また、特開
平７−１７９８５４号公報には、無水または半水石膏、
セメントおよび硫酸基を有する無機塩よりなる固化材が
開示されている。これ等は、対象土壌、固化材添加量、
評価方法等が夫々異なるため、固化材としての比較評価
は出来ないが、固化材については更なる改良が要求され
ていることは事実であり、また、徒に強度向上を図るの
ではなく、改良後土壌の使用目的に応じて調製された固
化材が要求されている。[0003] In order to solve this problem, several solidifying materials have been proposed that use both cement and gypsum as components and try to take advantage of the advantages of both systems. For example, JP-A-8-3023
No. 46 and JP-A-8-31446,
A solidified material composed of a mixture of hemihydrate gypsum, cement, lime, blast furnace slag and the like is disclosed, and Japanese Patent Application Laid-Open No. Hei 6-220451 discloses a solidified material composed of gypsum, Portland cement and aluminum sulfate. Also, in Japanese Unexamined Patent Publication No. 7-179854, anhydrous or hemihydrate gypsum,
A solidifying material comprising cement and an inorganic salt having a sulfate group is disclosed. These include the target soil, the amount of solidifying material added,
Because the evaluation methods are different, it is not possible to make a comparative evaluation as a solidified material.However, it is true that further improvement is required for the solidified material. There is a demand for a solidified material prepared according to the purpose of use of the post soil.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、含水土壌の
固化改良に優れた性能を示す固化材を提供し、含水土壌
の固化改良を可能にする方法の提供を目的とする。具体
的には、固化改良後のｐＨ値が植裁に適した６〜９の範
囲にあり、且つ、一軸圧縮強度が、人が上を歩ける尺度
である０．５ｋｇｆ／ｃｍ2 以上である土壌を与える固
化材の提供および該固化材を使用する含水土壌の固化改
良方法の提供を目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a solidified material having excellent performance in improving the solidification of hydrous soil and to provide a method for improving the solidification of hydrous soil. Specifically, a soil whose pH value after solidification improvement is in the range of 6 to 9 suitable for planting, and whose uniaxial compressive strength is 0.5 kgf / cm 2 or more, which is a measure for walking on a person. And a method for improving solidification of hydrous soil using the solidified material.
【０００５】[0005]
【課題を解決するための手段】本発明では、本質的に中
性である石膏に、強度付与材として特定量のセメントを
加えたものが上記課題を解決する固化材を与えることを
見出し、本発明を完成した。すなわち、本発明は、固化
材全体を１００重量部としたとき、２重量部より大で８
重量部以下のセメントと、残部が石膏よりなる含水土壌
用固化材及び該固化材を使用する含水土壌の固化改良方
法に関する。以下に本発明を説明する。According to the present invention, it has been found that gypsum, which is essentially neutral, to which a specific amount of cement has been added as a strength-imparting material, provides a solidifying material which solves the above-mentioned problems. Completed the invention. That is, according to the present invention, when the total amount of the solidified material is 100 parts by weight,
The present invention relates to a solidified material for hydrous soil, comprising cement of not more than part by weight and a balance of gypsum, and a method for improving solidification of hydrous soil using the solidified material. Hereinafter, the present invention will be described.
【０００６】[0006]
【発明の実施の形態】本発明の固化材は水硬性成分とし
て石膏を使用するものである。石膏は、それ自身が中性
であるだけでなく、金属イオンの溶出も極めて少なく、
固化後土壌が二次公害を引き起こす虞が全くないことか
ら化学的には望ましい材料であるが、強度的には石膏単
味では固化材としての十分な性能を示さず、固化材にお
ける水硬性成分として利用するには適当な固化助剤の存
在が必要である。一方、セメントは強度的には優れた改
良土壌を与え物理的には望ましい水硬性成分であるが、
本質的に強アルカリであるため、セメントを主成分とす
る固化材では、改良後土壌からのアルカリ公害を防止す
るために中和剤の存在が必要である。本発明者等は、石
膏に少量のセメントを添加したものが、ｐＨ値の大幅な
上昇を招くことなく固化後土壌の圧縮強度が石膏単味の
場合よりも改善された固化材となることを見出し、石膏
と少量のセメントより成る、本発明の含水土壌用固化材
の完成に至った。DESCRIPTION OF THE PREFERRED EMBODIMENTS The solidified material of the present invention uses gypsum as a hydraulic component. Gypsum is not only neutral in itself, but also has very little metal ion elution,
It is a chemically desirable material because the soil after solidification does not cause secondary pollution at all.However, in terms of strength, gypsum alone does not show sufficient performance as a solidified material, and hydraulic components in the solidified material Requires the presence of an appropriate solidification aid. On the other hand, cement is a hydraulic component that is physically desirable, giving an improved soil with excellent strength,
Since it is essentially a strong alkali, the cement-based solidifying material requires the presence of a neutralizing agent to prevent alkali pollution from the soil after improvement. The present inventors have found that the addition of a small amount of cement to gypsum is a solidified material in which the compressive strength of the soil after solidification is improved without a significant increase in pH value as compared with the case of gypsum alone. The present invention has led to the completion of the solidifying material for hydrous soil of the present invention, which comprises gypsum and a small amount of cement.
【０００７】本発明の固化材の主成分である石膏は、水
和反応による土壌中の水の固定化とその水硬性により、
含水土壌の固化を推進すると考えられ、二水物以外であ
れば履歴に関係なく使用することができる。例えば、半
水石膏、無水石膏またはこれ等の混合物を好適に用いる
事ができるが、中でも、二水石膏から比較的容易に得ら
れる半水石膏がコスト面で有利であり、且つ性能的にも
問題がないことから、最も好ましい材料である。[0007] Gypsum, which is the main component of the solidifying material of the present invention, is obtained by fixing water in soil by hydration and its hydraulic property.
It is considered to promote the solidification of the hydrated soil, and any material other than dihydrate can be used regardless of its history. For example, hemihydrate gypsum, anhydrous gypsum or a mixture thereof can be suitably used. Among them, hemihydrate gypsum relatively easily obtained from dihydrate gypsum is advantageous in terms of cost and performance. It is the most preferred material because it has no problems.
【０００８】一方、本発明の固化材のもう一つの成分で
あるセメントは、自身が水硬性であることと、石膏−セ
メント−アルミナ水和物であるエトリンガイトが生成す
る際に、土壌中の水分を吸収固定化することにより土壌
含水比が実質的に低下し、固化改良後土壌の強度が向上
すると考えられる。しかし、従来公知の様に、セメント
は強アルカリであるため、添加量が多すぎると固化改良
後土壌のｐＨ値が高くなりすぎ、また、少ないと添加効
果の発現が十分でないため強度的に十分な改良土壌を得
ることが出来ない。本発明においては、固化材中に占め
るセメントの割合を２〜８重量部の範囲とすることによ
り、ｐＨ値を９以下に維持したまま、固化後土壌の圧縮
強度を目標とする０．５ｋｇｆ／ｃｍ2 以上に向上する
ことが可能である。本発明で使用されるセメントとして
は、ポルトランドセメント、アルミナセメント、高炉セ
メント、フライアッシュセメント等を挙げることが出来
るが、中でも、アルミナセメントはアルカリ度が低く、
本発明の固化材用としては最も望ましい材料である。On the other hand, cement, which is another component of the solidifying material of the present invention, is itself hydraulic, and when ettringite, which is a gypsum-cement-alumina hydrate, is formed, the water content in the soil is reduced. It is considered that the soil moisture content is substantially reduced by immobilizing the soil, and the strength of the soil is improved after the solidification is improved. However, as is conventionally known, since cement is a strong alkali, if the amount of addition is too large, the pH value of the soil after solidification improvement becomes too high, and if the amount is too small, the effect of addition is not sufficient, so that the strength is not sufficient. It is not possible to obtain an improved soil. In the present invention, by setting the ratio of the cement in the solidified material to the range of 2 to 8 parts by weight, the compressive strength of the soil after solidification is set to 0.5 kgf / while maintaining the pH value at 9 or less. cm 2 or more. Examples of the cement used in the present invention include Portland cement, alumina cement, blast furnace cement, fly ash cement, etc., among which alumina cement has low alkalinity,
It is the most desirable material for the solidifying material of the present invention.
【０００９】本発明の固化材は、前述した組成を有する
石膏およびセメントの混合物が十分な性能を発揮する
が、更に成分としてカルボキシメチルセルロースを添加
することにより、更に性能の向上を計ることができる。
カルボキシメチルセルロースは、水の存在とＣａイオン
等の多価イオンの存在下では架橋して不溶性のゲルとな
るが、土壌−土壌、土壌−石膏、石膏−石膏粒子粒子間
に侵入した場合には、生成したゲルが土壌および石膏各
粒子を結合する作用を有するだけでなく、吸水により粘
着性が増すため、結果として石膏−セメント混合物の場
合よりも土壌強度が向上すると考えられる。しかし、粒
子間に過剰のゲルが介在するとそこが弱点となり逆に強
度は低下する。従って、カルボキシメチルセルロースの
添加量には最適値が存在するが、本発明の固化材におけ
るその値は、固化材全体の０．５〜１０重量部である。In the solidified material of the present invention, a mixture of gypsum and cement having the above-mentioned composition exhibits sufficient performance, but the performance can be further improved by adding carboxymethylcellulose as a component.
Carboxymethylcellulose crosslinks in the presence of water and the presence of polyvalent ions such as Ca ions to form an insoluble gel, but when infiltrated between soil-soil, soil-gypsum, gypsum-gypsum particles, It is considered that the formed gel not only has an action of binding soil and gypsum particles, but also has an increased tackiness due to water absorption, and as a result, soil strength is improved as compared with a gypsum-cement mixture. However, if an excessive amount of gel is interposed between the particles, it becomes a weak point and conversely decreases the strength. Therefore, there is an optimum value for the amount of carboxymethylcellulose to be added, but the value in the solidified material of the present invention is 0.5 to 10 parts by weight of the whole solidified material.
【００１０】本発明の固化材においては、成分として更
に無機多孔体吸水材または有機高分子吸水材を添加する
ことにより、固化材添加後土壌のｐＨ値をほとんど変動
させることなく、土壌の一軸圧縮強度を更に改善するこ
とが出来る。吸水材は、土壌中に存在する自由水と結合
・固定化して自由水量を減少させる働きを有しているこ
とから、吸水材を添加した固化材の使用は、含水比の低
い含水土壌の固化改良と同じになり、固化材添加後の一
軸圧縮強度が増加すると考えられる。従って、含水比の
高い土壌の固化改良においては、吸水材の添加は特に効
果的である。In the solidified material of the present invention, by adding an inorganic porous water absorbing material or an organic polymer water absorbing material as a component, the soil is uniaxially compressed without substantially changing the pH value of the soil after the solidifying material is added. Strength can be further improved. Since the water-absorbing material has the function of binding and fixing to the free water present in the soil and reducing the amount of free water, the use of the solidifying material to which the water-absorbing material is added is used to solidify the water-containing soil with a low water content. This is considered to be the same as the improvement, and the uniaxial compression strength after the addition of the solidifying material is considered to increase. Therefore, the addition of a water absorbing material is particularly effective in improving the solidification of soil having a high water content.
【００１１】本発明で使用可能な有機高分子吸水材の例
としては、ポリアクリルアミド、ポリメタクリルアミ
ド、ポリビニルアルコール、ポリアクリレート、澱粉グ
ラフト共重合体等が挙げられるが、中でも有機高分子吸
水材としては最もポピュラーなポリアクリルアミドおよ
びポリメタクリルアミドが、吸水性能の面で好ましい結
果を与える。一方、本発明で使用可能な無機多孔体吸水
材例としては、パーライト、ゼオライト、シリカ、ボト
ムアッシュ等を挙げることが出来るが、中でもパーライ
トが、吸水性能、化学的安定性、価格面で最も好ましい
材料である。Examples of the organic polymer water-absorbing material that can be used in the present invention include polyacrylamide, polymethacrylamide, polyvinyl alcohol, polyacrylate, starch graft copolymer and the like. The most popular polyacrylamide and polymethacrylamide give favorable results in terms of water absorption performance. On the other hand, examples of the inorganic porous water-absorbing material that can be used in the present invention include pearlite, zeolite, silica, and bottom ash. Among them, pearlite is the most preferable in terms of water absorption performance, chemical stability, and price Material.
【００１２】固化材全体を１００重量部とした吸水材の
添加量は、有機高分子系の場合には０．１〜５重量部、
無機質多孔体系の場合には１０〜４０重量部とするのが
良い。有機系、無機系何れにおいても、夫々の範囲より
少ないと添加効果が十分発現せず、逆に多いと経済的で
なくなるだけでなく、逆に固化改良後土壌の圧縮強度の
低下を招く場合がある。圧縮強度面での固化材の改良
は、固化改良に必要な固化材量の低減につながることか
ら、固化材への吸水材の添加量は、改良対象土の含水
比、および、目的強度を達成するのに必要な固化材の必
要量とを勘案して適宜決めることになる。The amount of the water-absorbing material added to the solidified material as 100 parts by weight is 0.1 to 5 parts by weight in the case of an organic polymer.
In the case of an inorganic porous system, the content is preferably 10 to 40 parts by weight. In both organic and inorganic systems, if the amount is less than the respective ranges, the effect of addition is not sufficiently exhibited, and if it is too large, not only is it not economical, but also the consolidation improvement may cause a decrease in the compressive strength of the soil. is there. Since the improvement of the solidified material in terms of compressive strength leads to a reduction in the amount of solidified material required for solidification improvement, the amount of water-absorbing material added to the solidified material achieves the water content ratio of the soil to be improved and the target strength It is determined appropriately in consideration of the necessary amount of the solidifying material necessary to perform the heat treatment.
【００１３】本発明の固化材の調製に必要な材料は何れ
も粉末状であることと、固化材がそれら材料の単なる混
合物であることから、その調製に当たっては特別な機
器、手段を必要とせず、ミキサー等公知の粉体混合用の
機器を使った、公知の粉体混合方法が適用できる。Since the materials required for preparing the solidified material of the present invention are all powders and the solidified material is merely a mixture of these materials, no special equipment or means is required for the preparation. A known powder mixing method using a known powder mixing device such as a mixer can be applied.
【００１４】本発明の固化材を使用して含水土壌の改良
を行なうに当たっては、水を加えたスラリー状として土
壌中に注入、散布する方法も適用できるが、土壌に余分
な水を加えない点で、粉末状態で混合するのが望まし
い。その際、一般に行なわれている、ミキサーで対象土
壌と混合するミキサー混合法や、スタビライザー用いる
浅層処理法が効果的に適用できる。また、含水土壌への
添加量は、含水土壌の特性、特に含水量によるが、含水
土壌１ｍ3 当たり５０〜４００ｋｇ添加することにより
目的とする０．５ｋｇｆ／ｃｍ2 以上の一軸圧縮強度を
有する改良土壌を得ることが出来る。もちろん、必要に
応じて固化材添加量を増やすことにより、ｐＨ値の上昇
を招くことなく土壌一軸圧縮強度を更に高める事も可能
であり、目的、経済性に合わせて適宜添加量を選択する
ことになる。以下に、具体的例を挙げて本発明を更に詳
しく説明する。In improving the water-containing soil by using the solidifying material of the present invention, a method of injecting and spraying into the soil in the form of a slurry containing water can be applied, but it does not add excess water to the soil. It is desirable to mix in a powder state. At this time, a mixer mixing method of mixing with a target soil by a mixer or a shallow layer treatment method using a stabilizer, which is generally performed, can be effectively applied. The amount of the water-containing soil, the characteristics of the water-containing soil, especially by water content, improved with 0.5 kgf / cm 2 or more uniaxial compressive strength of interest by adding 50~400kg per hydrous soil 1 m 3 You can get the soil. Of course, it is also possible to further increase the soil uniaxial compressive strength without increasing the pH value by increasing the amount of the solidifying material added as necessary, and appropriately selecting the amount to be added according to the purpose and economy. become. Hereinafter, the present invention will be described in more detail with reference to specific examples.
【００１５】[0015]
（１）固化材の調製 半水石膏粉末に所定量のセメント、カルボキシメチルセ
ルロース、吸水材を添加したものをホバート型ミキサー
で３分間混合して固化材を調製した。 （２）改良土壌の調製 上記（１）で調製した固化材の所定量を供試土壌に添加
した後、ホバート型ミキサーで３分間混合して改良土壌
を調製した。混合後の土壌を、直径５ｃｍ、高さ１０ｃ
ｍの鋼製の円筒型のモールドに充填し、温度２０℃、湿
度９６％の恒温恒湿槽内で７日間養生し、評価用の供試
体を得た。 （３）改良土壌の評価：一軸圧縮強度測定 上記（２）で得られた供試体について、ＪＩＳ Ａ１２
１６に則った方法でその一軸圧縮強さを測定した。尚、
一軸圧縮強度については、対象土壌１ｍ3 当たり１００
ｋｇ量の添加で、人がその上を歩く事が可能な強度であ
る０．５ｋｇｆ／ｃｍ2 以上の一軸圧縮強度を有する改
良土壌を与えるものを良とした。 （４）改良土壌の評価：ｐＨ測定 上記（２）で得られた成形前の土壌について、土質工学
会基準ＪＳＦＴ ２１１−１９９０に則り、改良土壌の
ｐＨを測定した。ｐＨ値については、９以下のものを良
とした。(1) Preparation of solidified material A predetermined amount of cement, carboxymethylcellulose, and a water-absorbing material added to hemihydrate gypsum powder were mixed with a Hobart mixer for 3 minutes to prepare a solidified material. (2) Preparation of Improved Soil After adding a predetermined amount of the solidified material prepared in the above (1) to the test soil, the mixture was mixed with a Hobart mixer for 3 minutes to prepare an improved soil. The mixed soil is 5cm in diameter and 10c in height.
m, and cured in a constant temperature and humidity chamber at a temperature of 20 ° C. and a humidity of 96% for 7 days to obtain a test specimen for evaluation. (3) Evaluation of Improved Soil: Measurement of Uniaxial Compressive Strength The specimen obtained in (2) above was subjected to JIS A12
The uniaxial compressive strength was measured by a method according to No. 16. still,
For uniaxial compressive strength, the target soil 1m 3 per 100
The addition of the amount of kg gave an improved soil having a uniaxial compressive strength of 0.5 kgf / cm 2 or more, which is a strength at which a person can walk on it. (4) Evaluation of Improved Soil: pH Measurement The soil before molding obtained in (2) above was measured for the pH of the improved soil in accordance with the Japan Society of Geotechnical Engineers Standard JSFT 211-1990. Regarding the pH value, those having a pH of 9 or less were regarded as good.
【００１６】実施例１〜６および比較例１〜５ 表１には、半水石膏と、アルミナセメントまたはポルト
ランドセメントの混合物を固化材とし、含水比４５％の
粘性土を対象土壌とした場合の例を示す。実施例におけ
る改良後土壌のｐＨ値は何れも９以下であり、且つ、一
軸圧縮強度も０．５ｋｇｆ／ｃｍ2 以上であり、目標と
する値を満足する改良土壌を与えた。しかし、本発明の
範囲を外れた組成の固化材では、固化改良後土壌のｐＨ
値および／または一軸圧縮強度が目標値に達せず、固化
材としては不適であった。Examples 1 to 6 and Comparative Examples 1 to 5 Table 1 shows that a mixture of hemihydrate gypsum and alumina cement or Portland cement was used as a solidifying material, and cohesive soil having a water content of 45% was used as a target soil. Here is an example. The pH value of the soil after improvement in each of the examples was 9 or less, and the unconfined compressive strength was 0.5 kgf / cm 2 or more, and an improved soil satisfying the target value was provided. However, in the case of a solidified material having a composition outside the scope of the present invention, the pH of the soil after solidification has been improved.
The value and / or the unconfined compressive strength did not reach the target value, and it was not suitable as a solidified material.
【００１７】[0017]
【表１】 [Table 1]
【００１８】実施例７〜１１ ここでは、半水石膏とアルミナセメントの混合物に、更
なる成分としてカルボキシメチルセルロースを添加した
場合の結果を表２示す。固化対象土壌は、実施例１〜６
と同じ、含水比４５％の粘性土である。この結果から、
カルボキシメチルセルロースを添加しても、固化改良後
土壌のｐＨ値の変動は少なく、一軸圧縮強度が向上する
ことが分かる。Examples 7 to 11 Here, Table 2 shows the results when carboxymethylcellulose was added as a further component to a mixture of hemihydrate gypsum and alumina cement. The soil to be solidified was obtained in Examples 1 to 6.
It is the same cohesive soil with a water content of 45%. from this result,
Even if carboxymethylcellulose is added, the change in pH value of the soil after solidification improvement is small, and it can be seen that the uniaxial compressive strength is improved.
【００１９】[0019]
【表２】 [Table 2]
【００２０】実施例１２〜１８ 表３には、半水石膏とアルミナセメントの混合物に更
に、有機系、無機系二種の吸水材を添加した固化材の例
を示す。この場合には、吸水材無添加の場合と比べて固
化改良後土壌のｐＨ値は若干上昇するが８以内に維持さ
れており、一軸圧縮強度が向上する。Examples 12 to 18 Table 3 shows examples of solidified materials obtained by adding two organic and inorganic water absorbing materials to a mixture of hemihydrate gypsum and alumina cement. In this case, the pH value of the soil after solidification improvement slightly increases as compared with the case where no water absorbing material is added, but is maintained within 8 and the uniaxial compressive strength is improved.
【００２１】[0021]
【表３】 [Table 3]
【００２２】[0022]
【発明の効果】本発明の固化材は石膏に少量のセメント
を添加した簡単な組成よりなるものであるが、それを使
用した改良後土壌はほヾ中性であり、アルカリ溶出によ
る問題は生じない。また、改良後土壌の一軸圧縮強度は
０．５ｋｇｆ／ｃｍ2 以上と歩行可能な強度を有してい
ることから、その上での作業が可能になるだけでなく、
植物が根を張るのに適した強度に収まっているため、植
裁に適した土壌を得ることが可能となる。The solidified material of the present invention has a simple composition in which a small amount of cement is added to gypsum, but the soil after improvement using the same is almost neutral, and the problem of alkali elution occurs. Absent. In addition, since the soil after the improvement has a uniaxial compressive strength of 0.5 kgf / cm 2 or more and can walk, not only can work on the soil be possible,
Since the plant has a strength suitable for rooting, soil suitable for planting can be obtained.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｅ０２Ｄ 3/12 １０２ Ｅ０２Ｄ 3/12 １０２ // Ｃ０９Ｋ 103:00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI E02D 3/12 102 E02D 3/12 102 // C09K 103: 00
Claims (6)
重量部より大で８重量部以下のセメントと、残部が石膏
よりなる含水土壌用固化材。(1) When the whole solidified material is 100 parts by weight,
A solidifying material for hydrous soil comprising cement in an amount greater than 8 parts by weight and not more than 8 parts by weight, and the balance being gypsum.
ルボキシメチルセルロースを含む、請求項１に記載の含
水土壌用固化材。2. The solidified material for hydrous soil according to claim 1, further comprising 0.5 to 10 parts by weight of carboxymethyl cellulose as a component.
多孔体吸水材を含む、請求項１または２に記載の含水土
壌用固化材。3. The solidified material for hydrous soil according to claim 1, further comprising 5 to 40 parts by weight of an inorganic porous material water-absorbing material as a component.
高分子吸水材を含む、請求項１または２に記載の含水土
壌用固化材。4. The solidified material for hydrous soil according to claim 1, further comprising 0.1 to 5 parts by weight of an organic polymer water-absorbing material as a component.
での何れかに記載の含水土壌用固化材。5. The solidifying material for hydrous soil according to claim 1, wherein the gypsum is hemihydrate gypsum.
土壌用固化材を、含水土壌１ｍ3 当たり５０〜４００ｋ
ｇ添加する、含水土壌の固化改良方法。6. The solidifying material for hydrous soil according to any one of claims 1 to 5, wherein the solidified material for hydrous soil is 50 to 400 k / m 3 of hydrous soil.
g, a method for improving solidification of hydrous soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7858097A JPH10273662A (en) | 1997-03-28 | 1997-03-28 | Solidifying material for water-containing soil and solidification and improvement of water-containing soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7858097A JPH10273662A (en) | 1997-03-28 | 1997-03-28 | Solidifying material for water-containing soil and solidification and improvement of water-containing soil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10273662A true JPH10273662A (en) | 1998-10-13 |
Family
ID=13665855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7858097A Pending JPH10273662A (en) | 1997-03-28 | 1997-03-28 | Solidifying material for water-containing soil and solidification and improvement of water-containing soil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10273662A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006225475A (en) * | 2005-02-16 | 2006-08-31 | Komurisu:Kk | Solidifier and method for improving solidification of soil by using the solidifier |
| CN102020990A (en) * | 2009-09-22 | 2011-04-20 | 山东宏艺科技股份有限公司 | Novel high-strength waterproof composite solid curing agent |
| JP2012235711A (en) * | 2011-05-10 | 2012-12-06 | Moss World Inc | Block for growing moss, and rooftop-greening structure using the same |
| CN103555339A (en) * | 2013-10-09 | 2014-02-05 | 李庆辉 | Soil solidifying agent with high water-resistance and application thereof |
| CN110865172A (en) * | 2019-10-23 | 2020-03-06 | 长沙理工大学 | Geotechnical test method for determining emergency construction parameters of soft plastic modified soil foundation |
-
1997
- 1997-03-28 JP JP7858097A patent/JPH10273662A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006225475A (en) * | 2005-02-16 | 2006-08-31 | Komurisu:Kk | Solidifier and method for improving solidification of soil by using the solidifier |
| CN102020990A (en) * | 2009-09-22 | 2011-04-20 | 山东宏艺科技股份有限公司 | Novel high-strength waterproof composite solid curing agent |
| JP2012235711A (en) * | 2011-05-10 | 2012-12-06 | Moss World Inc | Block for growing moss, and rooftop-greening structure using the same |
| CN103555339A (en) * | 2013-10-09 | 2014-02-05 | 李庆辉 | Soil solidifying agent with high water-resistance and application thereof |
| CN110865172A (en) * | 2019-10-23 | 2020-03-06 | 长沙理工大学 | Geotechnical test method for determining emergency construction parameters of soft plastic modified soil foundation |
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