JP6040424B2 - Chemical solution for ground injection and ground improvement method using it - Google Patents
Chemical solution for ground injection and ground improvement method using it Download PDFInfo
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- JP6040424B2 JP6040424B2 JP2012022453A JP2012022453A JP6040424B2 JP 6040424 B2 JP6040424 B2 JP 6040424B2 JP 2012022453 A JP2012022453 A JP 2012022453A JP 2012022453 A JP2012022453 A JP 2012022453A JP 6040424 B2 JP6040424 B2 JP 6040424B2
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- 238000002347 injection Methods 0.000 title claims description 53
- 239000007924 injection Substances 0.000 title claims description 53
- 239000000126 substance Substances 0.000 title claims description 46
- 239000000243 solution Substances 0.000 title claims description 29
- 230000006872 improvement Effects 0.000 title claims description 18
- 238000000034 method Methods 0.000 title claims description 15
- 239000004568 cement Substances 0.000 claims description 44
- 239000002893 slag Substances 0.000 claims description 32
- 239000000843 powder Substances 0.000 claims description 29
- 239000002270 dispersing agent Substances 0.000 claims description 20
- 229920002125 Sokalan® Polymers 0.000 claims description 18
- 239000004584 polyacrylic acid Substances 0.000 claims description 18
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims description 16
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 15
- 239000000920 calcium hydroxide Substances 0.000 claims description 15
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 15
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 15
- 238000010276 construction Methods 0.000 claims description 8
- 239000008155 medical solution Substances 0.000 claims description 8
- 125000004432 carbon atom Chemical group C* 0.000 claims description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 6
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 6
- 239000000178 monomer Substances 0.000 claims description 6
- 229920001577 copolymer Polymers 0.000 claims description 5
- 230000002265 prevention Effects 0.000 claims description 5
- 229910052783 alkali metal Inorganic materials 0.000 claims description 4
- 150000001340 alkali metals Chemical class 0.000 claims description 4
- 125000005702 oxyalkylene group Chemical group 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 239000000463 material Substances 0.000 description 23
- 239000007788 liquid Substances 0.000 description 22
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 20
- 230000035699 permeability Effects 0.000 description 18
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 12
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 239000011398 Portland cement Substances 0.000 description 6
- 239000004115 Sodium Silicate Substances 0.000 description 6
- 210000004556 brain Anatomy 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 230000007774 longterm Effects 0.000 description 6
- 229910052911 sodium silicate Inorganic materials 0.000 description 6
- 239000000725 suspension Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000001879 gelation Methods 0.000 description 4
- 235000019353 potassium silicate Nutrition 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000013065 commercial product Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 239000004908 Emulsion polymer Substances 0.000 description 1
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004111 Potassium silicate Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 235000019256 formaldehyde Nutrition 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000011396 hydraulic cement Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 description 1
- 229910052912 lithium silicate Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 125000006353 oxyethylene group Chemical group 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920001467 poly(styrenesulfonates) Polymers 0.000 description 1
- -1 polybutylene Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229940006186 sodium polystyrene sulfonate Drugs 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
本発明は地盤注入用薬液およびそれを用いた地盤改良工法に関する。 The present invention relates to a chemical solution for ground injection and a ground improvement method using the same.
地盤改良方法の一種として、軟弱な地盤を強固にするためにロッドを介して地中に硬化性を有する薬剤を注入する薬液注入工法があり、数多くの薬液注入材が知られている。例えば、水ガラス系注入材、特殊シリカ系注入材、高分子系注入材、並びに、セメント、粘土、及びスラグなどの懸濁型注入材等が挙げられる。上記薬液注入材を用いた薬液注入工法では、ジェットグラウト工法のような高圧の噴流によって地盤を乱しながら改良する工法と異なり、極力地盤を乱さないで改良できること、設備がコンパクトであることが特徴であることから多くの実績がある。 As one type of ground improvement method, there is a chemical solution injection method for injecting a curable drug into the ground through a rod in order to strengthen a soft ground, and many chemical solution injection materials are known. For example, water glass type injection material, special silica type injection material, polymer type injection material, and suspension type injection materials such as cement, clay, and slag can be used. The chemical injection method using the above chemical injection material is characterized in that it can be improved without disturbing the ground as much as possible, and the equipment is compact, unlike the method of improving the ground while disturbing the ground with a high-pressure jet like the jet grout method. So there are many achievements.
薬液注入材としては、溶液型と懸濁型があり、溶液型の薬液注入材は、浸透性は高いが、得られる硬化体自体の強度が小さく、硬化体の収縮も大きいことから長期的な耐久性に問題がある。一方、懸濁型の薬液注入材は、水硬性を示すセメントやスラグなどを成分とするものであり、比較的高い強度発現が期待でき、長期的な耐久性も確保しやすいという利点はあるが、浸透性が低いという問題がある。そのため、浸透性の高い懸濁型の開発が望まれている。 There are two types of chemical injection material: solution type and suspension type. Solution type chemical injection material has high permeability, but the strength of the resulting cured product itself is small, and the shrinkage of the cured product is large. There is a problem with durability. On the other hand, the suspension-type chemical solution injection material is composed of a cement or slag that exhibits hydraulic properties, and can be expected to exhibit relatively high strength, and has the advantage of ensuring long-term durability. There is a problem of low permeability. Therefore, development of a suspension type with high permeability is desired.
地盤を強化するための懸濁型注入材としては、例えば、特許文献１に、水ガラス及び石灰を含む地盤注入用薬液が記載されている。 As a suspension-type injection material for strengthening the ground, for example, Patent Document 1 describes a chemical solution for ground injection containing water glass and lime.
しかしながら、特許文献１は、上記水ガラスのモル比が１．５〜２．２であって、長いゲル化時間（数十分〜数時間以上）を有し、かつ耐久性及び固結強度に優れた薬液を得ることを目的としている。したがって、上記注入材を港湾や沿岸部の地盤改良を目的として使用する場合、ゲル化時間が長いため、地下水や海水の動きのある現場では、注入材の逸流や希釈により、目的とする改良体を得ることができないという問題がある。そこで、注入に当たり、ゲルタイムが短く、充分な強度を発現させ、長期耐久性及び地盤への浸透性に優れ、さらに地下水や海水等による注入材の逸流が少なく、必要な箇所に限定的に注入することが可能である地盤注入用薬液が求められている。 However, in Patent Document 1, the water glass has a molar ratio of 1.5 to 2.2, has a long gelation time (several tens of minutes to several hours or more), and is durable and consolidated. The purpose is to obtain an excellent chemical solution. Therefore, when the above-mentioned injection material is used for the purpose of ground improvement in harbors and coastal areas, the gelation time is long. There is a problem that the body cannot be obtained. Therefore, when injecting, the gel time is short, sufficient strength is developed, long-term durability and permeability to the ground are excellent, and there is little escape of injected material due to groundwater, seawater, etc. There is a need for a ground-injection chemical that can be used.
本発明は、上記のような問題に鑑みなされたものであり、ゲルタイムが短く、充分な強度を発現させ、長期耐久性、地盤への浸透性に優れた地盤注入用薬液およびそれを用いた地盤改良工法を提供することを課題とする。 The present invention has been made in view of the above problems, and has a short gel time, expresses sufficient strength, and has excellent long-term durability and permeability to the ground, and a ground using the same. It is an object to provide an improved construction method.
本発明者は、上記目的を達成すべく鋭意研究を重ねた結果、地盤注入用薬液が、特定の成分を特定量含有する場合には、上記目的を達成できることを見出し、本発明を完成するに至った。 As a result of intensive studies to achieve the above object, the present inventor has found that the above object can be achieved when the chemical solution for ground injection contains a specific component in a specific amount, thereby completing the present invention. It came.
即ち、本発明は、下記の地盤注入用薬液に関する。
１． 高炉スラグ微粉末、分級セメント、ポリアクリル酸系分散剤、消石灰及びケイ酸アルカリ金属塩を含有する地盤注入用薬液であって、
（１）前記ポリアクリル酸系分散剤の含有量が、前記高炉スラグ微粉末及び前記分級セメントの合計１００質量部に対して０．１〜３質量部であり、
（２）前記消石灰の含有量が、前記高炉スラグ微粉末及び前記分級セメントの合計１００質量部に対して１５〜３５質量部であり、
（３）前記ケイ酸アルカリ金属塩は、下記の一般式（I）：
Ｒ２Ｏ・ｎＳｉＯ２（Ｒ：アルカリ金属） （I）
（式中、モル比ｎは２．５以上を示す）で表され、
礫質地盤又は粗砂地盤の地盤改良又は液状化防止のための地盤改良工法において地盤内に注入される、
地盤注入用薬液。
２． 前記ポリアクリル酸系分散剤が下記一般式（II）：
ＣＨ２＝Ｃ（Ｒ１）ＣＯＯ（Ｒ２Ｏ）ｍＲ３ （II）
（式中、Ｒ１は水素原子又はメチル基、Ｒ２Ｏは炭素数２〜４のオキシアルキレン基、ｍは５〜４０の整数、Ｒ３は水素原子又は炭素数１〜５のアルキル基を示す。）の単量体を含む共重合体である、上記項１に記載の地盤注入用薬液。
３． 前記高炉スラグ微粉末及び前記分級セメントは、いずれも、
ブレーン比表面積値が7,000〜16,000cm2/gであり、
メジアン径が１〜７μｍである、
上記項１又は２に記載の地盤注入用薬液。
４． 上記項１〜３のいずれか１項に記載の地盤注入用薬液を礫質地盤又は粗砂地盤の地盤改良又は液状化防止のために地盤内に注入する、地盤改良工法。
５． 前記分級セメントの割合が、前記高炉スラグ微粉末１００質量部に対して、５〜３０質量部である上記項４に記載の地盤改良工法。
６． 前記ケイ酸アルカリ金属塩の含有量が、前記高炉スラグ微粉末と前記分級セメントの合計１００質量部に対して固形分換算で１０〜４０質量部である上記項４又は５に記載の地盤改良工法。
That is, this invention relates to the following chemical | medical solution for ground injection.
1. A chemical for ground injection containing blast furnace slag fine powder, classified cement, polyacrylic acid dispersant, slaked lime and alkali metal silicate,
(1) The content of the polyacrylic acid-based dispersant is 0.1 to 3 parts by mass with respect to a total of 100 parts by mass of the blast furnace slag fine powder and the classified cement,
(2) The content of the slaked lime is 15 to 35 parts by mass with respect to a total of 100 parts by mass of the blast furnace slag fine powder and the classified cement,
(3) The alkali metal silicate has the following general formula (I):
R 2 O.nSiO 2 (R: alkali metal) (I)
(Wherein the molar ratio n is 2.5 or more) ,
Injected into the ground in the ground improvement method for ground improvement or prevention of liquefaction of gravel ground or coarse sand ground,
Chemical solution for ground injection.
2. The polyacrylic acid-based dispersant is represented by the following general formula (II):
CH 2 = C (R 1) COO (R 2 O) mR 3 (II)
(In the formula, R 1 represents a hydrogen atom or a methyl group, R 2 O represents an oxyalkylene group having 2 to 4 carbon atoms, m represents an integer of 5 to 40, and R 3 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. The chemical | medical solution for ground injection of the said claim | item 1 which is a copolymer containing the monomer of showing.
3. The blast furnace slag fine powder and the classification cement are both
Blaine specific surface area value is 7,000-16,000cm 2 / g,
The median diameter is 1-7 μm,
Item 3. The chemical solution for ground injection according to item 1 or 2.
4). The ground improvement construction method which inject | pours the chemical | medical solution for ground injection of any one of said claim | item 1-3 into the ground for the ground improvement or prevention of liquefaction of gravel ground or rough sand ground.
5. The ground improvement construction method according to Item 4, wherein a ratio of the classified cement is 5 to 30 parts by mass with respect to 100 parts by mass of the blast furnace slag fine powder.
6). The ground improvement method according to item 4 or 5, wherein the content of the alkali metal silicate is 10 to 40 parts by mass in terms of solid content with respect to a total of 100 parts by mass of the blast furnace slag fine powder and the classified cement. .
以下、本発明の地盤注入用薬液について詳細に説明する。なお、本明細書中の部や％は、特記しない限り、質量部や質量％をいう。
≪本発明の地盤注入用薬液≫
本発明の地盤注入用薬液は、高炉スラグ微粉末、分級セメント、ポリアクリル酸系分散剤、消石灰及びケイ酸アルカリ金属塩を含有する地盤注入用薬液であって、
（１）前記ポリアクリル酸系分散剤の含有量が、前記高炉スラグ微粉末及び前記分級セメントの合計１００質量部に対して０．１〜３質量部であり、
（２）前記消石灰の含有量が、前記高炉スラグ微粉末及び前記分級セメントの合計１００質量部に対して１５〜３５質量部であり、
（３）前記ケイ酸アルカリ金属塩は、下記の一般式（I）：
Ｒ２Ｏ・ｎＳｉＯ２（Ｒ：アルカリ金属） （I）
（式中、モル比ｎは２．５以上を示す）で表される。上記特徴を有する本発明の地盤注入用薬液は、ゲルタイムが短く（１分以下）、充分な強度を発現させ、長期耐久性、地盤への浸透性に優れる。
Hereinafter, the ground injection chemical solution of the present invention will be described in detail. In the present specification, “parts” and “%” mean “parts by mass” and “mass%” unless otherwise specified.
≪Chemical solution for ground injection of the present invention≫
The ground injection chemical of the present invention is a ground injection chemical containing blast furnace slag fine powder, classified cement, polyacrylic acid dispersant, slaked lime and alkali metal silicate,
(1) The content of the polyacrylic acid-based dispersant is 0.1 to 3 parts by mass with respect to a total of 100 parts by mass of the blast furnace slag fine powder and the classified cement,
(2) The content of the slaked lime is 15 to 35 parts by mass with respect to a total of 100 parts by mass of the blast furnace slag fine powder and the classified cement,
(3) The alkali metal silicate has the following general formula (I):
R 2 O.nSiO 2 (R: alkali metal) (I)
(Wherein the molar ratio n is 2.5 or more). The chemical solution for ground injection of the present invention having the above characteristics has a short gel time (1 minute or less), exhibits sufficient strength, and is excellent in long-term durability and permeability into the ground.
本発明において、ゲルタイムを１分以下としているのは、ゲルタイムが１分を超える場合、波の押し引きの激しい現場や湧水のある現場において、地盤注入用薬液が逸流あるいは希釈してしまい、充分な強度を発現させることができず、長期耐久性を付与することができないためである。 In the present invention, the gel time is set to 1 minute or less, when the gel time exceeds 1 minute, the chemical solution for ground injection is diverted or diluted in a site where the wave is pushed and pulled heavily or a site where there is spring water, This is because sufficient strength cannot be expressed and long-term durability cannot be imparted.
高炉スラグ微粉末
本発明では、高炉スラグ微粉末を使用する。高炉スラグ微粉末は、銑鉄を製造するときに発生する鉄鋼スラグを粉砕して製造される、一般的な高炉セメントやコンクリート用混和材として用いられているものである。
Blast Furnace Slag Fine Powder In the present invention, blast furnace slag fine powder is used. Blast furnace slag fine powder is used as a general blast furnace cement or concrete admixture produced by grinding steel slag generated when pig iron is produced.
高炉スラグ微粉末の粉末度はブレーン比表面積値（以下、ブレーン値という）で7,000cm2/g以上である場合、地盤に対して優れた浸透性が得られるので好ましい。ブレーン値は、7,000〜16,000cm2/gがより好ましく、9,000〜13,000cm2/gが最も好ましい。ブレーン値はJIS R 5201のブレーン空気透過装置で測定した値である。 The fineness of the blast furnace slag fine powder is preferably 7,000 cm 2 / g or more in terms of the Blaine specific surface area value (hereinafter referred to as “brain value”), since excellent permeability to the ground can be obtained. Blaine value is more preferably 7,000~16,000cm 2 / g, 9,000~13,000cm 2 / g being most preferred. The brain value is a value measured with a JIS R 5201 brain air permeation device.
高炉スラグ微粉末のメジアン径は、１〜７μｍである場合、地盤に対して優れた浸透性が得られるので好ましく、２〜５μｍがより好ましい。例えば、メジアン径はレーザー回折式粒度分布測定機により測定できる。 When the median diameter of the blast furnace slag fine powder is 1 to 7 μm, it is preferable because excellent permeability to the ground is obtained, and 2 to 5 μm is more preferable. For example, the median diameter can be measured with a laser diffraction particle size distribution measuring machine.
分級セメント
分級セメントは、セメントを分級設備を用いて粒度調整したものである。分級するセメントとしては、普通ポルトランドセメント、早強ポルトランドセメント、低熱ポルトランドセメント、中庸熱ポルトランドセメント、耐硫酸塩セメントなどのポルトランドセメントいずれも使用可能であり、また、フライアッシュセメントやシリカセメントなどの混合セメントも同様であり、アルミナセメントなどの耐火セメントも同様である。当該セメントは、１種又は２種以上を組み合わせて使用することができる。
Classification cement Classification cement is obtained by adjusting the particle size of cement using classification equipment. As the cement to be classified, portland cement such as ordinary portland cement, early-strength portland cement, low heat portland cement, medium heat portland cement and sulfate resistant cement can be used. The same applies to cement, and the same applies to refractory cements such as alumina cement. The said cement can be used 1 type or in combination of 2 or more types.
分級セメントには、セメント成分以外にセメントの製造工程で加えられる二水セッコウや炭酸カルシウムを含有するものも含まれる。分級によって細かい粒子の炭酸カルシウムを含むものは強度発現性の点で有利となる。 The classified cement includes dihydrate gypsum and calcium carbonate added in the cement manufacturing process in addition to the cement component. Those containing fine particles of calcium carbonate by classification are advantageous in terms of strength development.
分級セメントの粉末度は、高炉スラグ微粉末と同様にブレーン値7,000cm2/g以上である場合、地盤に対して優れた浸透性が得られるので好ましい。ブレーン値は7,000〜16,000cm2/gがより好ましく、9,000〜13,000cm2/gが最も好ましい。ブレーン値はJIS R 5201のブレーン空気透過装置で測定した値である。 The fineness of the classified cement is preferably a brane value of 7,000 cm 2 / g or more, as in the case of the blast furnace slag fine powder, because excellent permeability to the ground can be obtained. Blaine value is more preferably 7,000~16,000cm 2 / g, 9,000~13,000cm 2 / g being most preferred. The brain value is a value measured with a JIS R 5201 brain air permeation device.
分級セメントのメジアン径は、１〜７μｍである場合、地盤に対して充分な浸透性が得られるので好ましく、２〜５μｍがより好ましい。例えば、メジアン径はレーザー回折式粒度分布測定機により測定できる。 When the median diameter of the classified cement is 1 to 7 μm, sufficient permeability to the ground can be obtained, and 2 to 5 μm is more preferable. For example, the median diameter can be measured with a laser diffraction particle size distribution measuring machine.
分級セメントの割合は、高炉スラグ微粉末100質量部に対して、5〜30質量部である場合、浸透性を阻害することなく優れた強度発現性が得られるので好ましい。高炉スラグ微粉末100質量部に対して10〜25質量部がより好ましい。 When the proportion of the classified cement is 5 to 30 parts by mass with respect to 100 parts by mass of the blast furnace slag fine powder, it is preferable because excellent strength development can be obtained without inhibiting the permeability. 10-25 mass parts is more preferable with respect to 100 mass parts of blast furnace slag fine powder.
ポリアクリル酸系分散剤
本発明では、ポリアクリル酸系分散剤を使用する。ポリアクリル酸系分散剤は、懸濁溶液としたときの粒子の沈降を抑制する効果と、浸透性を付与する。例えば、ポリアクリル酸系分散剤として、下記一般式（II）：
ＣＨ２＝Ｃ（Ｒ１）ＣＯＯ（Ｒ２Ｏ）ｍＲ３ （II）
の単量体を含む共重合体であるものを使用することができる。
Polyacrylic acid-based dispersant In the present invention, a polyacrylic acid-based dispersant is used. The polyacrylic acid-based dispersant imparts the effect of suppressing the sedimentation of particles when made into a suspension solution and the permeability. For example, as a polyacrylic acid-based dispersant, the following general formula (II):
CH 2 = C (R 1) COO (R 2 O) m R 3 (II)
What is a copolymer containing the monomer of this can be used.
ここで、式（II）中、Ｒ１は水素原子又はメチル基を示し、Ｒ２Ｏは炭素数２〜４のオキシアルキレン基、例えば、−ＣＨ２ＣＨ２Ｏ−、−ＣＨ２ＣＨ２ＣＨ２Ｏ−、−ＣＨ２ＣＨ（ＣＨ３）Ｏ−、−ＣＨ２ＣＨ（ＣＨ２ＣＨ３）Ｏ−、及び−ＣＨ２ＣＨ２ＣＨ２ＣＨ２Ｏ−などが挙げられる。ｍはオキシアルキレン基の付加モル数を示し、５〜40の整数である。ｍが上記範囲である場合、充分な分散力を有し、ハンドリング性にも優れる。 Here, in formula (II), R 1 represents a hydrogen atom or a methyl group, and R 2 O is an oxyalkylene group having 2 to 4 carbon atoms, such as —CH 2 CH 2 O—, —CH 2 CH 2 CH. 2 O -, - CH 2 CH (CH 3) O -, - CH 2 CH (CH 2 CH 3) O-, and -CH 2 CH 2 CH 2 CH 2 O- and the like. m shows the addition mole number of an oxyalkylene group, and is an integer of 5-40. When m is in the above range, it has a sufficient dispersion force and is excellent in handling properties.
また、Ｒ３は水素原子又は炭素数１〜５のアルキル基を示し、例えばメチル基、エチル基、プロピル基、及びブチル基等が挙げられる。 R 3 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group, and a butyl group.
単量体の例としては、アルキレンオキサイドの付加モル数ｍが５〜40モルのポリエチレングリコールモノ（メタ）アクリレート、ポリプロピレングリコールモノ（メタ）アクリレート、ポリブチレングリコールモノ（メタ）アクリレート、メトキシポリエチレングリコール（メタ）アクリレート、メトキシポリプロピレングリコール（メタ）アクリレート、メトキシポリブチレングリコール（メタ）アクリレート、エトキシポリエチレングリコール（メタ）アクリレート、エトキシポリプロピレングリコール（メタ）アクリレート、エトキシポリブチレングリコール（メタ）アクリレート、プロポキシポリエチレングリコール（メタ）アクリレートなどが挙げられ、これらの一種を単独で又は二種以上を組み合わせて用いることができる。一般式（II）で示される単量体が含まれていれば、他の化学構造を有する単量体成分と組み合わせた共重合体を使用してもよい。 Examples of monomers include polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, polybutylene glycol mono (meth) acrylate, methoxypolyethylene glycol (methylene oxide addition mole number 5-40 mol) (Meth) acrylate, methoxypolypropylene glycol (meth) acrylate, methoxypolybutylene glycol (meth) acrylate, ethoxypolyethylene glycol (meth) acrylate, ethoxypolypropylene glycol (meth) acrylate, ethoxypolybutylene glycol (meth) acrylate, propoxypolyethylene glycol ( (Meth) acrylate etc. are mentioned, These 1 type can be used individually or in combination of 2 or more types. As long as the monomer represented by the general formula (II) is contained, a copolymer combined with a monomer component having another chemical structure may be used.
これらの中では、沈降防止性能や浸透性能の面で、メトキシポリエチレングリコール（メタ）アクリレートやメトキシポリプロピレングリコール（メタ）アクリレートを含む共重合体等が好ましい。 Among these, a copolymer containing methoxypolyethylene glycol (meth) acrylate or methoxypolypropylene glycol (meth) acrylate is preferable in terms of anti-settling performance and penetration performance.
ポリアクリル酸系分散剤の質量平均分子量は、5,000〜100,000が好ましく、20,000〜80,000がより好ましい。 The weight average molecular weight of the polyacrylic dispersant is preferably 5,000 to 100,000, more preferably 20,000 to 80,000.
ポリアクリル酸系分散剤の使用量は、高炉スラグ微粉末と分級セメントの合計100質量部に対して、０．１〜３質量部であり、０．３〜２質量部が好ましい。０．１質量部未満であると十分な分散性と浸透性が得られず、３質量部を超えても効果に影響がない。 The usage-amount of a polyacrylic acid type dispersing agent is 0.1-3 mass parts with respect to a total of 100 mass parts of blast furnace slag fine powder and a classification cement, and 0.3-2 mass parts is preferable. If the amount is less than 0.1 parts by mass, sufficient dispersibility and permeability cannot be obtained, and if it exceeds 3 parts by mass, the effect is not affected.
本発明においては、本発明の効果に悪影響を与えない範囲でメラミン系分散剤を本発明のポリアクリル酸系分散剤に併用して使用してもよい。 In the present invention, a melamine dispersant may be used in combination with the polyacrylic acid dispersant of the present invention as long as the effects of the present invention are not adversely affected.
消石灰
本発明では、消石灰（水酸化カルシウム）を使用する。消石灰は、ゲルタイムの調整と初期強度発現を付与するものである。
Slaked lime In the present invention, slaked lime (calcium hydroxide) is used. Slaked lime imparts gel time adjustment and initial strength development.
消石灰の含有量は、前記高炉スラグ微粉末及び前記分級セメントの合計100質量部に対して１５〜３５質量部であり、ゲルタイムと強度の観点から２０〜３５質量部が好ましい。 The content of slaked lime is 15 to 35 parts by mass with respect to a total of 100 parts by mass of the blast furnace slag fine powder and the classified cement, and is preferably 20 to 35 parts by mass from the viewpoint of gel time and strength.
消石灰のメジアン径は、１〜７μｍが好ましく、２〜５μｍがより好ましい。例えば、メジアン径はレーザー回折式粒度分布測定機により測定できる。消石灰は、例えば市販品を使用することができる。 The median diameter of slaked lime is preferably 1 to 7 μm, and more preferably 2 to 5 μm. For example, the median diameter can be measured with a laser diffraction particle size distribution measuring machine. As the slaked lime, for example, a commercially available product can be used.
ケイ酸アルカリ金属塩
本発明では、ケイ酸アルカリ金属塩を使用する。ケイ酸アルカリ金属塩は、ゲルタイムの調整と初期強度発現を付与するものである。
In the present invention, an alkali metal silicate is used. The alkali metal silicate imparts adjustment of gel time and expression of initial strength.
本発明の地盤注入用水硬性セメント組成物において、ケイ酸アルカリ金属塩は、下記の一般式（I）におけるモル比ｎが２．５以上のケイ酸アルカリ金属塩である。 In the hydraulic cement composition for ground injection according to the present invention, the alkali metal silicate is an alkali metal silicate having a molar ratio n of 2.5 or more in the following general formula (I).
Ｒ２Ｏ・ｎＳｉＯ２（Ｒ：アルカリ金属） （I）
ケイ酸アルカリ金属塩としては、ケイ酸ナトリウム、ケイ酸カリウム、ケイ酸リチウムなどがある。この中でもケイ酸ナトリウムが供給の安定性および価格の面から最も好適である。また、ケイ酸アルカリ金属塩の形態としては、水溶液と粉末があるが、水溶液の方が市販品の種類も多く、作業性が良い理由から、薬液注入材に使用する場合は水溶液が主流である。
R 2 O.nSiO 2 (R: alkali metal) (I)
Examples of the alkali metal silicate include sodium silicate, potassium silicate, and lithium silicate. Of these, sodium silicate is most preferable in terms of supply stability and price. In addition, there are aqueous solutions and powders in the form of alkali metal silicates. However, aqueous solutions are the mainstream when used as chemical injection materials because there are more types of commercial products and workability is better. .
モル比ｎについて、２．５未満では1分以上ゲル化しない。よってモル比ｎは、２．５以上である必要があり、２．５〜４．２が好ましく、ゲルタイムと強度の観点から３．０〜４．２がより好ましい。また、モル比ｎが３．５以上になるとケイ酸アルカリ金属塩中のアルカリ量が減少し環境への負荷も低減される。 When the molar ratio n is less than 2.5, gelation does not occur for 1 minute or longer. Therefore, the molar ratio n needs to be 2.5 or more, preferably 2.5 to 4.2, and more preferably 3.0 to 4.2 from the viewpoint of gel time and strength. In addition, when the molar ratio n is 3.5 or more, the amount of alkali in the alkali metal silicate salt is reduced and the burden on the environment is also reduced.
また、ケイ酸アルカリ金属塩の含有量は、浸透性の観点から、高炉スラグ微粉末と分級セメントの合計100質量部に対して固形分換算で１０〜４０質量部が好ましく、固形分換算で１２〜３５質量部がより好ましい。 In addition, from the viewpoint of permeability, the content of alkali metal silicate is preferably 10 to 40 parts by mass in terms of solid content and 12 in terms of solid content with respect to a total of 100 parts by mass of blast furnace slag fine powder and classified cement. -35 mass parts is more preferable.
その他の成分
なお、本発明の地盤注入用薬液には、公知のセメント混和剤（材）を本来の性能に悪影響を与えない範囲で併用することができる。公知のセメント混和剤（材）としては、例えば、ＡＥ剤、ＡＥ減水剤、高性能減水剤、高性能ＡＥ減水剤、流動化剤、凝結遅延剤、早強剤、消泡剤、増粘剤、防水剤（材）、膨張剤（材）、急硬材、収縮低減剤（材）、防錆剤、セメント混和用ポリマーエマルジョン、及び粘土鉱物等が挙げられる。
Other Components In addition, a known cement admixture (material) can be used in combination with the chemical solution for ground injection according to the present invention as long as the original performance is not adversely affected. Known cement admixtures (materials) include, for example, AE agents, AE water reducing agents, high performance water reducing agents, high performance AE water reducing agents, fluidizing agents, setting retarders, early strengthening agents, antifoaming agents, thickeners. , Waterproofing agent (material), swelling agent (material), rapid hardening material, shrinkage reducing agent (material), rust preventive agent, cement emulsion polymer emulsion, clay mineral, and the like.
本発明の地盤注入用薬液は、水を加えてミルク状にして施工する。 The chemical solution for ground injection of the present invention is applied in the form of milk by adding water.
加える水の量が多くなるほど浸透性が良くなるが材料分離が助長され、圧送ホース内で閉塞するおそれがあり、少なければ、セメントミルクの粘度が大きくなりすぎて浸透性を阻害するおそれがある。使用する水の最適範囲は、高炉スラグ微粉末、分級セメント、及びポリアクリル酸系分散剤の合計100質量部に対して、400〜1,500質量部が好ましく、400〜1,200質量部がより好ましい。
≪本発明の地盤注入用薬液を地盤内に注入する地盤改良方法≫
本発明の地盤改良工法は、注入箇所としては、軟弱な地盤の改良であれば特に限定されるものではなく、例えば、港湾、護岸、空港等の構造物、地盤の悪い都市部や山間部等の各種構造物が立地している地盤に適用でき、止水や遮水グラウト、ヒービング防止グラウト、沈下防止グラウト、ブロー防止グラウト、土圧軽減グラウト、支持力増加グラウト、吸出し防止グラウトなどを目的として使用できる。浸透性が良好であるため、礫を含むような砂質土地盤への適用も可能であり、液状化防止対策としても有効に機能する。特に、礫質地盤又は粗砂地盤に注入する場合、地下水や海水の動きがあっても薬液の逸流や希釈を防止しつつ注入することができるので、上記現場での使用が好ましい。また、本発明の地盤注入用薬液は、パッカー材として地盤に注入することでパッカーを形成することも可能である。この場合、さらに緩結性地盤注入用薬液（本液）を地盤に注入する際に注入範囲以外への逸脱を防ぐことができる。
The greater the amount of water added, the better the permeability, but the material separation is encouraged and there is a risk of clogging in the pumping hose, otherwise there is a risk that the viscosity of the cement milk will become too high and impede permeability. The optimum range of water to be used is preferably 400 to 1,500 parts by mass, more preferably 400 to 1,200 parts by mass with respect to 100 parts by mass in total of the blast furnace slag fine powder, classified cement, and polyacrylic acid dispersant.
≪Ground improvement method for injecting the chemical for ground injection of the present invention into the ground≫
The ground improvement method of the present invention is not particularly limited as an injection site as long as the soft ground is improved. For example, a structure such as a port, a seawall, an airport, a badly urban area, a mountainous area, etc. It can be applied to the ground where various types of structures are located. Can be used. Since it has good permeability, it can be applied to sandy ground including gravel, and effectively functions as a liquefaction prevention measure. In particular, when injecting into gravelly ground or coarse sandy ground, it is possible to inject while preventing the escape or dilution of the chemical solution even if there is movement of groundwater or seawater, so that it is preferably used in the above-mentioned field. Moreover, the chemical | medical solution for ground injection | pouring of this invention can also form a packer by inject | pouring into the ground as a packer material. In this case, it is possible to prevent deviation from the range other than the injection range when the chemical solution for slow-injection ground injection (main liquid) is injected into the ground.
本発明において、施工方法は特に限定されるものではなく、通常の薬液注入で使用している施工設備を用いることができ、通常実施している注入設計と施工方法に準拠すればよい。例えば、ミキサーで調製した懸濁溶液をポンプでホースを介して圧送し、地中に配置したロッドを介して注入材を注入する方法が挙げられる。その際に使用するロッドは特に限定されるものではないが、単管ロッド、単管ストレーナロッド、二重管ロッド、二重管のダブルパッカー方式ロッドなどが使用できる。 In the present invention, the construction method is not particularly limited, and construction equipment used in normal chemical solution injection can be used, and it is only necessary to comply with the injection design and construction method that are normally performed. For example, the suspension solution prepared with the mixer is pumped through a hose with a pump, and the injection | pouring material is inject | poured through the rod arrange | positioned in the ground. The rod used in this case is not particularly limited, but a single tube rod, a single tube strainer rod, a double tube rod, a double tube double packer rod, and the like can be used.
本発明の地盤注入用薬液は、基本的には２ショットで注入を行なうが、地盤の状態や目的に応じて、１．５ショット方式で施工することもできる。 The ground injection chemical solution of the present invention is basically injected in 2 shots, but can also be applied by a 1.5 shot system depending on the state and purpose of the ground.
本発明の地盤注入用薬液は、特定の成分を特定量含有するため、ゲルタイムが短く（１分以下）、充分な強度を発現させ、長期耐久性、地盤への浸透性に優れた地盤注入用薬液を提供することができる。 Since the chemical solution for ground injection of the present invention contains a specific amount of a specific component, the gel time is short (1 minute or less), sufficient strength is expressed, long-term durability, and excellent ground permeability. A chemical solution can be provided.
以下に実施例及び比較例を示し、本発明をより具体的に説明する。但し、本発明は実施例に限定されない。 Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. However, the present invention is not limited to the examples.
実施例１〜１９及び比較例１〜１２
高炉スラグ微粉末、分級セメント、ポリアクリル酸系分散剤および消石灰を水に懸濁させた液をＡ液(500L)とし、珪酸ソーダ及び水を含有する液をＢ液(500L)とした。
Examples 1-19 and Comparative Examples 1-12
A liquid in which blast furnace slag fine powder, classified cement, polyacrylic acid dispersant and slaked lime were suspended in water was designated as liquid A (500 L), and a liquid containing sodium silicate and water was designated as liquid B (500 L).
上記Ａ液中の高炉スラグ微粉末は、ブレーン値10,500cm2/g、メジアン径3.6μｍの市販品を使用した。分級セメントは、普通ポルトランドセメントを分級した分級セメント（ブレーン値9,700cm2/g、メジアン径4.1μｍ、炭酸カルシウム含有量11.3質量％）を使用した。ポリアクリル酸系分散剤は、市販のポリアクリル酸系分散剤（メトキシポリエチレングリコールメタアクリレート系、一般式（II）において、Ｒ１はメチル基、Ｒ２Ｏは炭素数２のオキシエチレン基、Ｒ３はメチル基、ｍ＝23、質量平均分子量は42,000。質量平均分子量はＧＰＣ法（標準物質：ポリスチレンスルホン酸ナトリウム／水系）により測定した。）を使用した。消石灰は，メジアン径3.4μｍの市販品を使用した。 As the blast furnace slag fine powder in the liquid A, a commercial product having a brain value of 10,500 cm 2 / g and a median diameter of 3.6 μm was used. As the classified cement, a classified cement obtained by classifying ordinary Portland cement (brane value 9,700 cm 2 / g, median diameter 4.1 μm, calcium carbonate content 11.3 mass%) was used. The polyacrylic acid-based dispersant is a commercially available polyacrylic acid-based dispersant (methoxypolyethylene glycol methacrylate-based, general formula (II), wherein R 1 is a methyl group, R 2 O is a C 2 oxyethylene group, R 3 is a methyl group, m = 23, and the mass average molecular weight is 42,000. The mass average molecular weight was measured by GPC method (standard substance: sodium polystyrene sulfonate / water system). The slaked lime used a commercial product with a median diameter of 3.4 μm.
また、上記Ｂ液中の珪酸ソーダにおけるモル比、ＳｉＯ２（質量％）、Ｎａ２Ｏ（質量％）及び比重については、以下の表１に示す。 The molar ratio, SiO 2 (mass%), Na 2 O (mass%) and specific gravity of sodium silicate in the B liquid are shown in Table 1 below.
Ａ液(500L)及びＢ液(500L)の各成分の質量又は体積、並びに使用した珪酸ソーダのモル比を以下の表２に示す。 Table 2 below shows the mass or volume of each component of Liquid A (500 L) and Liquid B (500 L), and the molar ratio of sodium silicate used.
評価試験（ゲルタイム測定）
液温を２０℃に調整したＡ、Ｂ両液の混合物（本発明の地盤注入用薬液）についてゲルタイムを測定した。
Evaluation test (gel time measurement)
The gel time was measured for a mixture of both liquids A and B adjusted to 20 ° C. (chemical solution for ground injection of the present invention).
ゲルタイムについては、以下のようにカップ倒立法を用いて測定した。
［１］ まず、Ａ液（セメント懸濁液）２５０ｍｌ、及びＢ液（珪酸ソーダ液）２５０ｍｌをそれぞれ別のビーカーに秤取る。
［２］ Ａ液をＢ液に速やかに流し入れる。直ちに空いたＡ液のビーカーに全量を速やかに入れ、次に空いたＢ液のビーカーに全量を流し入れる。
［３］ 上記［２］の操作を速やかに繰り返し、Ａ液をＢ液に全量投入した時点から、液が流動しなくなった時点までをゲルタイムとする。
About gel time, it measured using the cup inversion method as follows.
[1] First, 250 ml of liquid A (cement suspension) and 250 ml of liquid B (sodium silicate liquid) are weighed in separate beakers.
[2] Pour A liquid into B liquid immediately. Immediately put the entire amount into an empty liquid A beaker, and then pour the entire amount into an empty liquid B beaker.
[3] The operation of [2] above is repeated rapidly, and the gel time is defined as the time from when the entire amount of liquid A is added to liquid B until the liquid stops flowing.
なお各材料の温度は、恒温槽などで一定温度(今回試験は２０℃)に調整し、取り出し後速やかに試験を行う。屋外等で温度調整ができない場合は、測定時の温度を記録する。実施例１〜１９及び比較例１〜１２の地盤注入用薬液の上記試験によって測定されたゲルタイムについて、以下の表２に示す。
評価試験（圧縮強度測定）
液温を２０℃に調整した実施例９〜１２及び比較例１１〜１２のＡ、Ｂ両液の混合物をゲル化前に、直径５０ｍｍ、高さ１００ｍｍの一端を密閉したアクリルパイプモールドの中に流し入れ、速やかにもう一端を密閉した。作製した供試体を恒温に保たれた室内に７日間養生後、モールドから取り出し、一軸圧縮強度試験機を用いて圧縮強度を測定した。
In addition, the temperature of each material is adjusted to a constant temperature (this test is 20 ° C.) in a thermostatic bath or the like, and the test is performed immediately after removal. If the temperature cannot be adjusted outdoors, record the temperature at the time of measurement. About the gel time measured by the said test of the chemical | medical solution for ground injection of Examples 1-19 and Comparative Examples 1-12, it shows in the following Table 2.
Evaluation test (compressive strength measurement)
The mixture of both A and B liquids of Examples 9-12 and Comparative Examples 11-12, whose liquid temperatures were adjusted to 20 ° C., was placed in an acrylic pipe mold with one end having a diameter of 50 mm and a height of 100 mm sealed before gelation. The other end was immediately sealed. The prepared specimen was cured in a room kept at a constant temperature for 7 days, then removed from the mold, and the compressive strength was measured using a uniaxial compressive strength tester.
実施例９〜１２及び比較例１１〜１２の地盤注入用薬液の上記試験によって測定されたゲルタイム及び圧縮強度について、以下の表２に示す。 Table 2 below shows the gel time and compressive strength measured by the above test of the chemical solutions for ground injection in Examples 9 to 12 and Comparative Examples 11 to 12.
Claims (6)
（１）前記ポリアクリル酸系分散剤の含有量が、前記高炉スラグ微粉末及び前記分級セメントの合計１００質量部に対して０．１〜３質量部であり、
（２）前記消石灰の含有量が、前記高炉スラグ微粉末及び前記分級セメントの合計１００質量部に対して１５〜３５質量部であり、
（３）前記ケイ酸アルカリ金属塩は、下記の一般式（I）：
Ｒ２Ｏ・ｎＳｉＯ２（Ｒ：アルカリ金属） （I）
（式中、モル比ｎは２．５以上を示す）で表され、
礫質地盤又は粗砂地盤の地盤改良又は液状化防止のための地盤改良工法において地盤内に注入される、
地盤注入用薬液。 A chemical for ground injection containing blast furnace slag fine powder, classified cement, polyacrylic acid dispersant, slaked lime and alkali metal silicate,
(1) The content of the polyacrylic acid-based dispersant is 0.1 to 3 parts by mass with respect to a total of 100 parts by mass of the blast furnace slag fine powder and the classified cement,
(2) The content of the slaked lime is 15 to 35 parts by mass with respect to a total of 100 parts by mass of the blast furnace slag fine powder and the classified cement,
(3) The alkali metal silicate has the following general formula (I):
R 2 O.nSiO 2 (R: alkali metal) (I)
(Wherein the molar ratio n is 2.5 or more) ,
Injected into the ground in the ground improvement method for ground improvement or prevention of liquefaction of gravel ground or coarse sand ground,
Chemical solution for ground injection.
ＣＨ２＝Ｃ（Ｒ１）ＣＯＯ（Ｒ２Ｏ）ｍＲ３ （II）
（式中、Ｒ１は水素原子又はメチル基、Ｒ２Ｏは炭素数２〜４のオキシアルキレン基、ｍは５〜４０の整数、Ｒ３は水素原子又は炭素数１〜５のアルキル基を示す。）
の単量体を含む共重合体である、請求項１に記載の地盤注入用薬液。 The polyacrylic acid-based dispersant is represented by the following general formula (II):
CH 2 = C (R 1) COO (R 2 O) m R 3 (II)
(In the formula, R 1 represents a hydrogen atom or a methyl group, R 2 O represents an oxyalkylene group having 2 to 4 carbon atoms, m represents an integer of 5 to 40, and R 3 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. Show.)
The chemical | medical solution for ground injection | pouring of Claim 1 which is a copolymer containing the monomer of.
ブレーン比表面積値が7,000〜16,000cm2/gであり、
メジアン径が１〜７μｍである、
請求項１又は２に記載の地盤注入用薬液。 The blast furnace slag fine powder and the classification cement are both
Blaine specific surface area value is 7,000-16,000cm 2 / g,
The median diameter is 1-7 μm,
The chemical | medical solution for ground injection of Claim 1 or 2.
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