JPH10273664A - 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
- JPH10273664A JPH10273664A JP9078582A JP7858297A JPH10273664A JP H10273664 A JPH10273664 A JP H10273664A JP 9078582 A JP9078582 A JP 9078582A JP 7858297 A JP7858297 A JP 7858297A JP H10273664 A JPH10273664 A JP H10273664A
- Authority
- JP
- Japan
- Prior art keywords
- soil
- water
- solidification
- solidifying material
- solidified material
- 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
- 239000000463 material Substances 0.000 title claims abstract description 71
- 239000002689 soil Substances 0.000 title claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000007711 solidification Methods 0.000 title claims description 25
- 230000008023 solidification Effects 0.000 title claims description 25
- 239000004568 cement Substances 0.000 claims abstract description 35
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 19
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims abstract description 19
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 16
- 229910000358 iron sulfate Inorganic materials 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 13
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 12
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 12
- 239000011358 absorbing material Substances 0.000 claims description 13
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical group [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 6
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 6
- 229920000620 organic polymer Polymers 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract 1
- 239000003513 alkali Substances 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 230000003472 neutralizing effect Effects 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000010440 gypsum Substances 0.000 description 3
- 229910052602 gypsum Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- XIXADJRWDQXREU-UHFFFAOYSA-M lithium acetate Chemical compound [Li+].CC([O-])=O XIXADJRWDQXREU-UHFFFAOYSA-M 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- XKPJKVVZOOEMPK-UHFFFAOYSA-M lithium;formate Chemical compound [Li+].[O-]C=O XKPJKVVZOOEMPK-UHFFFAOYSA-M 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000001139 pH measurement Methods 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- -1 polymethacrylamide Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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、石膏系はアルカリ溶出によるア
ルカリ公害を引き起こす可能性は低いものの、固化後土
壌に十分な強度を付与できるものが得られていない。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 are roughly classified into cement type and gypsum type according to the type of hydraulic component contained, but gypsum type is not likely to cause alkali pollution due to alkali elution, but can give sufficient strength to soil after solidification Is not obtained.
【０００３】一方、セメント系固化材は、セメントが強
アルカリであるためアルカリ公害を引き起こす可能性が
あるものの、固化後土壌は強度的に問題ないことから、
強度面を活かしつつアルカリ公害を抑制する試みが数多
く為されている。例えば、特開昭６１−２２７８９９号
公報には、セメントに中和剤としてアルミニウムまたは
鉄の硫酸塩を添加した固化材が開示され、特開平５−７
８６６４号公報には、セメントに中和剤として硫酸バン
ドを添加した固化材が開示されている。また、特公昭５
７−１９７１６号公報には、セメントに、硫酸アルミニ
ウム、アルカリ金属炭酸塩、アルカリ土類金属の酸化物
を添加した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] On the other hand, cement-based solidification materials may cause alkaline pollution because cement is a strong alkali, but the soil after solidification has no problem in strength.
Many attempts have been made to suppress alkali pollution while taking advantage of the strength. For example, Japanese Unexamined Patent Publication (Kokai) No. 61-227899 discloses a solidified material obtained by adding aluminum or iron sulfate as a neutralizing agent to cement.
No. 8664 discloses a solidified material obtained by adding a sulfuric acid band as a neutralizing agent to cement. In addition, Tokubo Sho 5
Japanese Patent Application Laid-Open No. 7-19716 discloses a solidified material obtained by adding aluminum sulfate, an alkali metal carbonate, and an oxide of an alkaline earth metal to cement. This is because the target soil, the amount of solidified material added, the evaluation method, etc. are different from each other, it is not possible to compare and evaluate as a solidified material, but it is true that further improvement is required for the solidified material, However, there is a demand for a solidified material prepared according to the purpose of use of the soil after the improvement, not to improve the strength.
【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、ｐＨ値が、土壌の緩衝能力によるｐＨ値降下が
速やかに起こり易い９．５以下の範囲であり、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, the pH value is in a range of 9.5 or less, where the pH value drop due to the buffer capacity of the soil is likely to occur quickly, and the uniaxial compressive strength is 0.5 kgf, which is a measure that allows a person to walk up.
An object of the present invention is to provide a solidified material that gives soil having a density of not less than / cm 2 or more, and to provide 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、特定の割合
のアルミナセメント、硫酸アルミニウムまたは硫酸鉄、
およびリチウム塩より成る混合物が、上記課題を解決す
る優れた固化剤となることを見出し、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、１０〜３０重量部の硫酸アルミニウムまたは
硫酸鉄と、０．５〜５重量部のリチウム塩と、残部がア
ルミナセメント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, a specific proportion of alumina cement, aluminum sulfate or iron sulfate,
The present inventors have found that a mixture composed of a lithium salt and a lithium salt can be an excellent solidifying agent to solve the above-mentioned problems, and have completed the present invention. That is, the present invention relates to a hydrous soil comprising 10 to 30 parts by weight of aluminum sulfate or iron sulfate, 0.5 to 5 parts by weight of a lithium salt, and the balance being alumina cement, when the whole solidified material is 100 parts by weight. The present invention relates to a solidification material for use and a method for improving solidification of hydrous soil using the solidification 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
てアルミナセメントを使用するものである。セメントを
成分とする固化材は、強度面では優れた固化改良土壌を
与えるが、セメントはそれ自身が強アルカリであり、セ
メントを固化材の成分として使用するに当たっては、ア
ルカリ溶出の抑制に留意する必要がある。本発明者等
は、セメントの中でも比較的低アルカリのアルミナセメ
ントを主成分としたものに、中和剤として硫酸アルミニ
ウムまたは硫酸鉄等の金属硫酸塩、および、硬化促進材
としてリチウム塩を添加した組成物が優れた含水土壌用
固化材となることを見出し、本発明を完成した。DESCRIPTION OF THE PREFERRED EMBODIMENTS The solidified material of the present invention uses alumina cement as a hydraulic component. Solidified material containing cement gives solidified improved soil in terms of strength, but cement itself is a strong alkali, and when using cement as a component of solidified material, pay attention to suppressing alkali elution. There is a need. The present inventors have added a metal sulfate such as aluminum sulfate or iron sulfate as a neutralizing agent, and a lithium salt as a hardening accelerator to a cement mainly containing relatively low alkali alumina cement among cements. The present inventors have found that the composition is an excellent solidifying material for hydrous soil, and have completed the present invention.
【０００７】本発明において、水硬性成分として使用す
るセメントはアルミナセメントであるが、上述のよう
に、アルミナセメントは、セメントの中では比較的低ア
ルカリであり、セメントを添加した固化材としては、固
化改良後土壌のｐＨ値上昇抑制に好ましい効果を与える
だけでなく、耐酸性に優れているという長所も有してい
る。In the present invention, the cement used as the hydraulic component is alumina cement. As described above, alumina cement is relatively low alkali among cements, and as a solidifying material to which cement is added, Not only does it have a favorable effect on suppressing the increase in soil pH value after solidification improvement, but it also has the advantage of being excellent in acid resistance.
【０００８】しかし、セメントを使用する限り、固化後
土壌のｐＨ上昇は避けられない。本発明の固化材では、
硫酸アルミニウムまたは硫酸鉄を中和材として添加し、
セメントを使用することによるｐＨ上昇の抑制を図って
いる。本発明の固化材の主成分であるアルミナセメント
は、組成の相互に異なるものが数種市販されているが、
その何れもが何等の支障もなく使用可能である。一方、
中和剤として添加される硫酸アルミニウム、および、硫
酸第一鉄または硫酸第二鉄の形態の硫酸鉄は何れも、安
価で且つ入手が容易な材料であり、中和剤として性能的
に問題はないが、硫酸アルミニウムの使用が効果の点で
好ましい。However, as long as cement is used, an increase in soil pH after solidification cannot be avoided. In the solidified material of the present invention,
Add aluminum sulfate or iron sulfate as neutralizer,
The use of cement is intended to suppress an increase in pH. Alumina cement, which is a main component of the solidifying material of the present invention, is commercially available in several types having different compositions.
Any of them can be used without any trouble. on the other hand,
Aluminum sulfate added as a neutralizing agent, and iron sulfate in the form of ferrous sulfate or ferric sulfate are both inexpensive and easily available materials, and there is no problem in performance as a neutralizing agent. However, the use of aluminum sulfate is preferred in terms of effect.
【０００９】しかし、硫酸アルミニウムおよび硫酸鉄
は、アルミナセメントの硬化遅延材としても働くことか
ら、その添加量には限度があり、本発明の固化材中にお
ける硫酸アルミニウムまたは硫酸鉄の割合は、固化材全
体の１０〜３０重量部とすることにより、固化材として
好ましい結果を与える。However, since aluminum sulfate and iron sulfate also act as a retarder for setting alumina cement, the amount of aluminum sulfate and iron sulfate is limited, and the proportion of aluminum sulfate or iron sulfate in the solidified material of the present invention is limited. When the content is 10 to 30 parts by weight of the whole material, a preferable result as a solidifying material is obtained.
【００１０】本発明の固化材は、アルミナセメントと、
硫酸アルミニウムまたは硫酸鉄等の金属硫酸塩よりなる
成分に加えて更にリチウム塩を添加して、硬化速度を高
くすることを図っている。リチウムイオンがアルミナセ
メントの硬化促進材として働くことは公知であり、リチ
ウム塩の添加により、中和剤としての硫酸アルミニウム
または硫酸鉄添加によるアルミナセメントの硬化遅延が
補償され、固化材として十分な性能を有する固化材を得
ることが出来る。本発明の固化材で使用されるリチウム
塩の例としては、炭酸リチウム、塩化リチウム、硝酸リ
チウム等の無機塩、または、酢酸リチウム、ぎ酸リチウ
ム等の有機塩を挙げることができるが、価格および入手
の容易さで炭酸リチウムの使用が最も好ましい。[0010] The solidifying material of the present invention comprises alumina cement,
In order to increase the curing rate, a lithium salt is further added in addition to a component comprising a metal sulfate such as aluminum sulfate or iron sulfate. It is known that lithium ions act as a hardening accelerator for alumina cement, and the addition of lithium salt compensates for the delay in hardening of alumina cement due to the addition of aluminum sulfate or iron sulfate as a neutralizing agent, and provides sufficient performance as a solidifying material. Can be obtained. Examples of the lithium salt used in the solidifying material of the present invention include inorganic salts such as lithium carbonate, lithium chloride and lithium nitrate, or organic salts such as lithium acetate and lithium formate. The use of lithium carbonate is most preferred because of its availability.
【００１１】リチウム塩の添加量は、固化材全体の０．
５〜５重量部とするのが良い。この範囲より少ないと添
加効果が十分に発現せず、多すぎると不経済であるだけ
でなく、固化後土壌のｐＨ上昇を招くことがあり好まし
くない。[0011] The addition amount of the lithium salt is 0.1% of the entire solidified material.
The content is preferably 5 to 5 parts by weight. If the amount is less than this range, the effect of addition is not sufficiently exhibited, and if the amount is too large, it is not only uneconomical, but also undesirably increases the pH of the soil after solidification.
【００１２】本発明の固化材は、前述した様に、アルミ
ナセメント、硫酸アルミニウムまたは硫酸鉄、リチウム
塩を適量混合することにより十分その性能を発揮する
が、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値はほとん
ど変動させることなく、固化改良後土壌の一軸圧縮強度
を更に改善することができる。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。As described above, the solidified material of the present invention can sufficiently exhibit its performance by mixing an appropriate amount of alumina cement, aluminum sulfate or iron sulfate, and a lithium salt. By adding the water absorbing material, the uniaxial compressive strength of the soil after solidification improvement can be further improved without substantially changing the pH value of the soil after addition of the solidification material. Since the water-absorbing material has the function of binding and fixing to the free water existing in the soil to reduce 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. Same as improvement,
It is considered that the uniaxial compressive strength after the addition of the solidifying material is increased.
Therefore, the addition of a water absorbing material is particularly effective in improving the solidification of soil having a high water content.
【００１３】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系吸
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 usable 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, bottom ash and the like. Among them, pearlite is the most preferable in terms of water absorption performance, chemical stability, and price. Material.
【００１４】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５〜４０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 5 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. Improvement of solidified material in terms of compressive strength
Because it leads to a reduction in the amount of solidified material required for solidification improvement,
The amount of the water-absorbing material to be added to the solidified material is appropriately determined in consideration of the water content of the soil to be improved and the required amount of the solidified material necessary to achieve the target strength.
【００１５】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 necessary for preparing the solidified material of the present invention are all powdery 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.
【００１６】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、対象土壌とミキサ
ーを用いて混合するミキサー混合法やスタビライザーを
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、ｐ
Ｈ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. It is desirable to mix in a powder state. At that time, a mixer mixing method of mixing the target soil with a mixer and a shallow layer treatment method using a stabilizer, which are 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, by increasing the amount of the solidifying material added as necessary, p
It is possible to further increase the unconfined soil compressive strength without increasing the H value, and the amount to be added is appropriately selected according to the purpose and economy. Hereinafter, the present invention will be described in more detail with reference to specific examples.
【００１７】[0017]
（１）固化材の調製 所定量のアルミナセメント、硫酸アルミニウムおよび炭
酸リチウム、更に必要に応じて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０．５ｋｇ／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、９．５以下のもの
を良とした。(1) Preparation of solidified material A predetermined amount of alumina cement, aluminum sulfate, lithium carbonate and, if necessary, a water-absorbing material added thereto 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 kg amount gave an improved soil having a uniaxial compressive strength of 0.5 kg / cm 2 or more, which is a strength that allows a person to walk on the soil. (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 9.5 or less were regarded as good.
【００１８】実施例１〜７および比較例１〜４ アルミナセメント、硫酸アルミニウムまたは硫酸第二
鉄、炭酸リチウムの混合比を種々変えた固化材を調製
し、含水比４５％の粘性土を対象土壌とした場合の結果
を表１に示す。本発明の範囲に含まれる組成を有する固
化材を用いた場合、固化改良後土壌のｐＨ値は何れも
９．５以下であり、且つ、一軸圧縮強度は０．５ｋｇｆ
／ｃｍ2以上であり、目的とする基準をクリアしてい
た。それに対して、本発明の範囲を外れる組成を有する
固化材では、固化改良後土壌のｐＨ値または一軸圧縮強
度が目標とした基準に達せず、固化材としては不適であ
ることが分かる。Examples 1 to 7 and Comparative Examples 1 to 4 A solidified material was prepared by varying the mixing ratio of alumina cement, aluminum sulfate or ferric sulfate, and lithium carbonate. Table 1 shows the results in the case where. When a solidified material having a composition falling within the range of the present invention is used, the pH value of the soil after solidification improvement is 9.5 or less, and the uniaxial compressive strength is 0.5 kgf.
/ Cm 2 or more, meeting the target standard. On the other hand, in the case of a solidified material having a composition outside the range of the present invention, the pH value or the unconfined compressive strength of the soil after solidification improvement does not reach the target standard, indicating that it is unsuitable as a solidified material.
【００１９】[0019]
【表１】 [Table 1]
【００２０】実施例８、９ 表１には、アルミナセメント、硫酸アルミニウムおよび
炭酸リチウムからなる成分に、更に有機系または無機系
吸水材を加えた固化材についての結果を合わせて示され
ている。無機系、有機系を問わず、吸水材の添加によ
り、改良後土壌のｐＨ値を中性付近に保持したまま一軸
圧縮強度が向上することが分かる。Examples 8 and 9 Table 1 also shows the results of a solidified material obtained by adding an organic or inorganic water absorbing material to a component composed of alumina cement, aluminum sulfate and lithium carbonate. It can be seen that the addition of a water-absorbing material, whether inorganic or organic, improves the uniaxial compressive strength while maintaining the pH value of the soil after improvement near neutrality.
【００２１】[0021]
【発明の効果】本発明の固化材は、石膏、アルミナセメ
ント、ポルトランドセメン、および硫酸アルミニウムま
たは硫酸鉄を成分とするものであるが、それを使用した
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、ｐＨ値も、土壌の緩衝能力に
よるｐＨ値降下が速やかに起こり易い値である９．５以
下に収まっており、アルカリ公害を引き起こす可能性も
低い。The solidified material of the present invention contains gypsum, alumina cement, portland cement, and aluminum sulfate or iron sulfate, and the unconfined compressive strength of the soil after improvement using the same is 0.5 kgf. / Cm 2 or more, so that it is possible to work on it because it has a walking strength and the pH value is a value at which the pH value drop due to the buffer capacity of the soil easily occurs. 0.5 or less, and is unlikely to cause alkaline pollution.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｅ０２Ｄ 3/12 １０１ Ｅ０２Ｄ 3/12 １０１ // Ｃ０９Ｋ 103:00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI E02D 3/12 101 E02D 3/12 101 // C09K 103: 00
Claims (5)
０重量部の硫酸アルミニウムまたは硫酸鉄と、０．５〜
５重量部のリチウム塩と、残部がアルミナセメントより
なる含水土壌用固化材(1) When the whole is 100 parts by weight, 10 to 3 parts
0 parts by weight of aluminum sulfate or iron sulfate and 0.5 to
Solidifying material for hydrous soil consisting of 5 parts by weight of lithium salt and balance of alumina cement
多孔体吸水材を含む、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 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に記載の含水土壌用固化
材。3. The solidifying 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.
から３までの何れかに記載の含水土壌用固化材。4. The method according to claim 1, wherein the lithium salt is lithium carbonate.
4. The solidifying material for hydrous soil according to any one of items 1 to 3.
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。5. The water-containing soil solidifying material according to claim 1, wherein the solidified material for water-containing soil is 50 to 400 k / m 3 of water-containing soil.
g, a method for improving solidification of hydrous soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9078582A JPH10273664A (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 |
|---|---|---|---|
| JP9078582A JPH10273664A (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 |
|---|---|
| JPH10273664A true JPH10273664A (en) | 1998-10-13 |
Family
ID=13665911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9078582A Pending JPH10273664A (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) | JPH10273664A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000109831A (en) * | 1998-10-01 | 2000-04-18 | Ube Ind Ltd | Solidifying material for moisture-containing soil and improvement of solidification of moisture-containing soil |
-
1997
- 1997-03-28 JP JP9078582A patent/JPH10273664A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000109831A (en) * | 1998-10-01 | 2000-04-18 | Ube Ind Ltd | Solidifying material for moisture-containing soil and improvement of solidification of moisture-containing soil |
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