JP7355358B2 - Consolidation material for ground injection and its manufacturing method - Google Patents
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- JP7355358B2 JP7355358B2 JP2017119795A JP2017119795A JP7355358B2 JP 7355358 B2 JP7355358 B2 JP 7355358B2 JP 2017119795 A JP2017119795 A JP 2017119795A JP 2017119795 A JP2017119795 A JP 2017119795A JP 7355358 B2 JP7355358 B2 JP 7355358B2
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- 239000000463 material Substances 0.000 title claims description 102
- 238000002347 injection Methods 0.000 title claims description 101
- 239000007924 injection Substances 0.000 title claims description 101
- 238000007596 consolidation process Methods 0.000 title claims description 76
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 239000007788 liquid Substances 0.000 claims description 63
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 61
- 239000004115 Sodium Silicate Substances 0.000 claims description 57
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 57
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 47
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 31
- 239000000347 magnesium hydroxide Substances 0.000 claims description 31
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 31
- 239000002253 acid Substances 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 229910001868 water Inorganic materials 0.000 claims description 25
- 238000001879 gelation Methods 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 10
- 239000011734 sodium Substances 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 239000000499 gel Substances 0.000 description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 25
- 230000000052 comparative effect Effects 0.000 description 18
- 239000000243 solution Substances 0.000 description 16
- 238000002360 preparation method Methods 0.000 description 13
- 239000000203 mixture Substances 0.000 description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 230000035699 permeability Effects 0.000 description 10
- 239000008119 colloidal silica Substances 0.000 description 9
- 239000002689 soil Substances 0.000 description 8
- 239000000377 silicon dioxide Substances 0.000 description 7
- 239000000654 additive Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 235000010724 Wisteria floribunda Nutrition 0.000 description 4
- 239000004927 clay Substances 0.000 description 4
- 235000019353 potassium silicate Nutrition 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010227 cup method (microbiological evaluation) Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 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、地盤注入用固結材に関し、特に地盤注入時に地盤への浸透性が良好であり、また固結後に高強度を発揮する地盤注入用固結材及びその製造方法に関する。 The present invention relates to a consolidating material for ground injection, and more particularly to a consolidating material for ground injection that has good permeability into the ground when poured into the ground and exhibits high strength after consolidation, and a method for manufacturing the same.
従来、地盤の液状化防止注入工事に有用な地盤注入用固結材としては、例えば、珪酸ソーダと酸成分を含有する地盤注入用固結材が知られている。珪酸ソーダ（水ガラス）としては、いわゆる５号珪酸ソーダ（ＳｉＯ２／Ｎａ２Ｏで表されるモル比が３．７程度）、３号珪酸ソーダ（ＳｉＯ２／Ｎａ２Ｏで表されるモル比が３．２程度）等が用いられている。また、地盤注入用固結材のＳｉＯ２含有量を増加して強度を向上させるべく、水ガラスにコロイダルシリカを配合したものも知られている。 Conventionally, as a consolidating material for ground injection useful for ground liquefaction prevention injection work, for example, a consolidating material for ground injection containing sodium silicate and an acid component is known. Sodium silicate (water glass) includes so-called No. 5 sodium silicate (molar ratio expressed as SiO 2 /Na 2 O of about 3.7), No. 3 sodium silicate (molar ratio expressed as SiO 2 /Na 2 O), ratio of about 3.2), etc. are used. Furthermore, in order to increase the SiO 2 content of a consolidation material for ground injection and improve its strength, it is also known that water glass is blended with colloidal silica.
具体的には、特許文献１には、コロイダルシリカと水ガラスの混合物（アルカリ性シリカ溶液）に反応剤として硫酸、リン酸、塩化アルミニウム等を添加することにより得られるグラウト（地盤注入用固結材）が記載されている。特に［0029］段落には、「例えば、アルカリ性シリカ溶液に酸性反応剤を添加して該溶液を酸性～中性領域に調整して所定のゲル化時間（ゲルタイム）を有するグラウトとすることができる。」と記載されている。 Specifically, Patent Document 1 describes grout (consolidation material for ground injection) obtained by adding sulfuric acid, phosphoric acid, aluminum chloride, etc. as a reactant to a mixture of colloidal silica and water glass (alkaline silica solution). ) are listed. In particular, paragraph [0029] states, ``For example, by adding an acidic reactant to an alkaline silica solution and adjusting the solution to an acidic to neutral range, a grout having a predetermined gel time can be obtained. .'' is stated.
しかしながら、上記従来の地盤注入用固結材には次のような問題がある。即ち、従来の地盤注入用固結材はＳｉＯ２含有量を増加するために水ガラスにコロイダルシリカを混合する場合があるが、コロイダルシリカが混合されることにより地盤注入時に地盤への浸透性が十分でない。特に密な地盤又は粘土質の地盤への浸透は困難である。 However, the above-mentioned conventional consolidation material for ground injection has the following problems. In other words, in conventional cementing materials for ground injection, colloidal silica is sometimes mixed with water glass to increase the SiO 2 content, but by mixing colloidal silica, the permeability into the ground is improved during ground injection. not enough. Penetration into dense or clayey ground is particularly difficult.
地盤への浸透性を向上させるには、例えば、コロイダルシリカを使用せず、珪酸ソーダの含有量を多くすることによりＳｉＯ２含有量を確保することが提案できるが、珪酸ソーダの含有量を多くするとゲル化時間が短くなるため、地盤注入用固結材の調製自体が困難であるという問題がある。 In order to improve the permeability into the ground, for example, it can be proposed to secure the SiO 2 content by increasing the content of sodium silicate without using colloidal silica. Since the gelation time is then shortened, there is a problem in that it is difficult to prepare the consolidation material for ground injection.
よって、これらの問題を改善した地盤注入用固結材の開発が望まれており、具体的には、ＳｉＯ２含有量が１１質量％以上と多いにもかかわらず、部分ゲルの発生が抑制されていて調製が容易であり、ゲル化時間が長く確保されており、しかも地盤への浸透性が良好な地盤注入用固結材の開発が望まれている。 Therefore, it is desired to develop a consolidating material for ground injection that improves these problems.Specifically, despite the high SiO2 content of 11% by mass or more, the generation of partial gels is suppressed. It is desired to develop a consolidation material for ground injection that is easy to prepare, has a long gelation time, and has good permeability into the ground.
本発明は、ＳｉＯ２含有量が１１質量％以上と多いにもかかわらず、部分ゲルの発生が抑制されていて調製が容易であり、ゲル化時間が長く確保されており、しかも地盤への浸透性が良好な地盤注入用固結材を提供することを目的とする。 Although the present invention has a high SiO2 content of 11% by mass or more, the generation of partial gels is suppressed, it is easy to prepare, a long gelation time is ensured, and it does not penetrate into the ground. The purpose of the present invention is to provide a consolidation material for ground injection with good properties.
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、珪酸ソーダ、水酸化マグネシウム及び酸成分を含有する特定の組成物からなる地盤注入用固結材が、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 research to achieve the above object, the present inventor has found that a consolidation material for ground injection made of a specific composition containing sodium silicate, magnesium hydroxide, and an acid component can achieve the above object. This discovery led to the completion of the present invention.
即ち、本発明は、下記の地盤注入用固結材及びその製造方法に関する。
１．珪酸ソーダ、水酸化マグネシウム及び酸成分を含有する地盤注入用固結材であって、
（１）前記地盤注入用固結材は、ＳｉＯ２濃度が１１質量％以上であり、
（２）Ｓｉを含有する固形分の平均粒子径が０．８０ｎｍ以下であり、
（３）ゲル化時間が１時間以上である、
ことを特徴とする地盤注入用固結材。
２．粘度が３．５ｍＰａ・ｓ以下である、上記項１に記載の地盤注入用固結材。
３．上記項１又は２に記載する地盤注入用固結材の製造方法であって、
（１）前記地盤注入用固結材は、ＳｉＯ２濃度が１１質量％以上であり、
（２）（i）珪酸ソーダ、水酸化マグネシウム及び水を含有するＡ液と、（ii）酸成分及び水を含有し且つ珪酸ソーダを含有しないＢ液と、を混合してＣ液を得る工程を有し、前記Ａ液を調製する原料としての水酸化マグネシウムは実質的に針状結晶を含有しない、
ことを特徴とする製造方法。
４．前記Ａ液を調製する原料としての前記珪酸ソーダは、ＳｉＯ２／Ｎａ２Ｏで表されるモル比が３～５であり、且つ、ＳｉＯ２濃度が１０～３０質量％である、上記項３に記載の製造方法。
５．前記Ａ液を調製する原料としての前記珪酸ソーダは、ＳｉＯ２／Ｎａ２Ｏで表されるモル比が３．１～３．８であり、且つ、ＳｉＯ２濃度が２０～３０質量％である、上記項３又は４に記載の製造方法。
６．上記項３～５のいずれかに記載の製造方法において、前記Ｃ液を得る工程の後に、当該Ｃ液に珪酸ソーダ及び水を含有するＤ液を混合する工程を更に有する、中結型又は瞬結型の地盤注入用固結材の製造方法。
That is, the present invention relates to the following consolidation material for ground injection and its manufacturing method.
1. A consolidation material for ground injection containing sodium silicate, magnesium hydroxide, and an acid component,
(1) The consolidation material for ground injection has a SiO 2 concentration of 11% by mass or more,
(2) The average particle diameter of the solid content containing Si is 0.80 nm or less,
(3) The gelation time is 1 hour or more.
Consolidation material for ground injection characterized by:
2. The consolidation material for ground injection according to item 1 above, which has a viscosity of 3.5 mPa·s or less.
3. A method for manufacturing a consolidation material for ground injection according to item 1 or 2 above, comprising:
(1) The consolidation material for ground injection has a SiO 2 concentration of 11% by mass or more,
(2) A step of obtaining liquid C by mixing (i) liquid A containing sodium silicate, magnesium hydroxide, and water, and (ii) liquid B containing an acid component and water but not containing sodium silicate. and the magnesium hydroxide as a raw material for preparing the liquid A does not substantially contain needle crystals.
A manufacturing method characterized by:
4. Item 3 above, wherein the sodium silicate as a raw material for preparing the liquid A has a molar ratio of SiO 2 /Na 2 O of 3 to 5 and a SiO 2 concentration of 10 to 30% by mass. The manufacturing method described in.
5. The sodium silicate as a raw material for preparing the liquid A has a molar ratio of SiO 2 /Na 2 O of 3.1 to 3.8, and a SiO 2 concentration of 20 to 30% by mass. , the manufacturing method according to item 3 or 4 above.
6. In the manufacturing method according to any one of items 3 to 5 above, after the step of obtaining the C liquid, the method further comprises a step of mixing a D liquid containing sodium silicate and water with the C liquid. A method for producing a compacting material for ground injection.
本発明の地盤注入用固結材は、（i）珪酸ソーダ、水酸化マグネシウム及び水を含有するＡ液と、（ii）酸成分及び水を含有し且つ珪酸ソーダを含有しないＢ液とを混合してＣ液を得ることにより調製される。この調製方法は、添加剤である水酸化マグネシウムの作用によりＡ液とＢ液とを混合した際のゲル化時間が長く確保されており、最終的な固結材のＳｉＯ２濃度が１１質量％以上と高濃度であっても部分ゲルの発生が抑制されていて調製が容易であり、しかも地盤（特に密な地盤や粘土質の地盤）への浸透性が良好である。また、ＳｉＯ２濃度が１１質量％以上であるため固結後の強度も優れている。なお、部分ゲルの発生が抑制されていることは、地盤注入用固結材中のＳｉを含有する固形分の平均粒子径が０．８０ｎｍ以下であることから把握することができる。 The consolidation material for ground injection of the present invention is a mixture of (i) liquid A containing sodium silicate, magnesium hydroxide, and water, and (ii) liquid B containing an acid component and water but not containing sodium silicate. It is prepared by doing this to obtain Solution C. This preparation method ensures a long gelation time when liquids A and B are mixed due to the action of magnesium hydroxide, an additive, and the SiO 2 concentration of the final solidifying material is 11% by mass. Even at such high concentrations, the formation of partial gels is suppressed and preparation is easy, and moreover, it has good permeability into the ground (particularly dense ground or clay ground). Furthermore, since the SiO 2 concentration is 11% by mass or more, the strength after consolidation is also excellent. In addition, it can be understood that the generation of partial gel is suppressed from the fact that the average particle diameter of the solid content containing Si in the consolidation material for ground injection is 0.80 nm or less.
以下、本発明の地盤注入用固結材について詳細に説明する。 Hereinafter, the consolidation material for ground injection of the present invention will be explained in detail.
本発明の地盤注入用固結材
本発明の地盤注入用固結材は、珪酸ソーダ、水酸化マグネシウム及び酸成分を含有する地盤注入用固結材であって、
（１）前記地盤注入用固結材は、ＳｉＯ２濃度が１１質量％以上であり、
（２）Ｓｉを含有する固形分の平均粒子径が０．８０ｎｍ以下であり、
（３）ゲル化時間が１時間以上である、
ことを特徴とする。
Consolidation material for ground injection of the present invention The consolidation material for ground injection of the present invention is a consolidation material for ground injection containing sodium silicate, magnesium hydroxide, and an acid component,
(1) The consolidation material for ground injection has a SiO 2 concentration of 11% by mass or more,
(2) The average particle diameter of the solid content containing Si is 0.80 nm or less,
(3) The gelation time is 1 hour or more.
It is characterized by
上記特徴を有する本発明の地盤注入用固結材は、（i）珪酸ソーダ、水酸化マグネシウム及び水を含有するＡ液と、（ii）酸成分及び水を含有し且つ珪酸ソーダを含有しないＢ液とを混合してＣ液を得ることにより調製される。 The consolidating material for ground injection of the present invention having the above-mentioned characteristics includes (i) liquid A containing sodium silicate, magnesium hydroxide, and water, and (ii) liquid B containing an acid component and water but not containing sodium silicate. It is prepared by mixing with liquid to obtain liquid C.
この調製方法は、添加剤である水酸化マグネシウムの作用によりＡ液とＢ液とを混合した際のゲル化時間が長く確保されており、最終的な固結材のＳｉＯ２濃度が１１質量％以上と高濃度であっても部分ゲルの発生が抑制されていて調製が容易であり、しかも地盤（特に密な地盤や粘土質の地盤）への浸透性が良好である。また、ＳｉＯ２濃度が１１質量％以上であるため固結後の強度も優れている。 This preparation method ensures a long gelation time when liquids A and B are mixed due to the action of magnesium hydroxide, an additive, and the SiO 2 concentration of the final solidifying material is 11% by mass. Even at such high concentrations, the formation of partial gels is suppressed and preparation is easy, and moreover, it has good permeability into the ground (particularly dense ground or clay ground). Furthermore, since the SiO 2 concentration is 11% by mass or more, the strength after consolidation is also excellent.
本発明の地盤注入用固結材は、（i）珪酸ソーダ、水酸化マグネシウム及び水を含有するＡ液と、（ii）酸成分及び水を含有し且つ珪酸ソーダを含有しないＢ液とを混合してＣ液を得ることにより調製される。 The consolidation material for ground injection of the present invention is a mixture of (i) liquid A containing sodium silicate, magnesium hydroxide, and water, and (ii) liquid B containing an acid component and water but not containing sodium silicate. It is prepared by doing this to obtain Solution C.
Ａ液を調製する原料としての珪酸ソーダとしては限定されず、市販品やそれに水を加えて希釈した希釈溶液を使用できる。 Sodium silicate as a raw material for preparing liquid A is not limited, and a commercially available product or a diluted solution obtained by adding water to it can be used.
珪酸ソーダのモル比（ＳｉＯ２／Ｎａ２Ｏ）は限定されないが、３～５程度が好ましく、汎用の珪酸ソーダが使えるため、３．１～３．８程度がより好ましい。 The molar ratio of sodium silicate (SiO 2 /Na 2 O) is not limited, but is preferably about 3 to 5, and more preferably about 3.1 to 3.8 since general-purpose sodium silicate can be used.
珪酸ソーダに含まれるシリカ濃度（ＳｉＯ２濃度）としては、１０～３０質量％程度が好ましく、２０～３０質量％程度がより好ましい。 The silica concentration (SiO 2 concentration) contained in the sodium silicate is preferably about 10 to 30% by mass, more preferably about 20 to 30% by mass.
珪酸ソーダとしては、一般に１号珪酸ソーダ～５号珪酸ソーダが知られているが、その中でも３号珪酸ソーダ～５号珪酸ソーダが好ましく、特に５号珪酸ソーダが好ましい。５号珪酸ソーダを用いることにより、部分ゲルの発生をより抑制することができ、得られる地盤注入用固結材の固結後の強度向上及び収縮抑制の効果が得られ易い。５号珪酸ソーダは、モル比が３．７、ＳｉＯ２濃度が２５．６質量％であり、モル比が３．５～３．８、ＳｉＯ２濃度が２４～３０質量％の珪酸ソーダを用いる場合には、５号珪酸ソーダと同様の良好な効果が得られ易い。 As sodium silicate, sodium silicate No. 1 to sodium silicate No. 5 are generally known, but among these, sodium silicate No. 3 to sodium silicate No. 5 are preferred, and sodium silicate No. 5 is particularly preferred. By using No. 5 sodium silicate, the generation of partial gel can be further suppressed, and the effect of improving the strength and suppressing shrinkage after consolidation of the resulting consolidation material for ground injection can be easily obtained. No. 5 sodium silicate has a molar ratio of 3.7 and an SiO 2 concentration of 25.6% by mass, and sodium silicate with a molar ratio of 3.5 to 3.8 and an SiO 2 concentration of 24 to 30% by mass is used. In some cases, the same good effects as with No. 5 sodium silicate are likely to be obtained.
Ａ液を調製する原料としての水酸化マグネシウムとしては限定的ではないが、地盤注入用固結材の製品品質の観点からは平均粒子径が３００～１０００μｍのものが好ましく、特に５００～８５０μｍのものがより好ましい。なお、本明細書における水酸化マグネシウムの平均粒子径は、光学顕微鏡を用いた２点間距離測定により測定した値である。 The magnesium hydroxide used as a raw material for preparing liquid A is not limited, but from the viewpoint of product quality of the consolidating material for ground injection, those with an average particle size of 300 to 1000 μm are preferable, particularly those of 500 to 850 μm. is more preferable. In addition, the average particle diameter of magnesium hydroxide in this specification is a value measured by two-point distance measurement using an optical microscope.
Ａ液を調製する原料としての水酸化マグネシウムは市販品を用いることができる。なお、本発明では、水酸化マグネシウムは球状結晶から構成されていることが好ましく、針状結晶は含まれていないことが好ましい。針状結晶が含まれる場合には、水酸化マグネシウムのＡ液中での溶解性に影響を及ぼす可能性がある。よって、針状結晶が含まれる場合には、光学顕微鏡で水酸化マグネシウム粒子２００個を観察した際に針状結晶の個数は１０個以下であることが好ましい。 A commercially available magnesium hydroxide can be used as a raw material for preparing liquid A. In the present invention, the magnesium hydroxide is preferably composed of spherical crystals, and preferably does not contain needle-shaped crystals. If needle-like crystals are included, the solubility of magnesium hydroxide in Solution A may be affected. Therefore, when needle-like crystals are included, it is preferable that the number of needle-like crystals is 10 or less when 200 magnesium hydroxide particles are observed with an optical microscope.
水酸化マグネシウムはＡ液とＢ液とを混合した際のゲル化時間の短縮を抑制することができるため、水酸化マグネシウムの添加により、部分ゲルの発生を抑制し、ＳｉＯ２濃度が１１質量％以上である、ゲル化時間が１時間以上の地盤注入用固結材が得られる。 Magnesium hydroxide can suppress the shortening of the gelation time when liquid A and liquid B are mixed, so by adding magnesium hydroxide, the generation of partial gel can be suppressed, and the SiO 2 concentration can be reduced to 11% by mass. As described above, a consolidation material for ground injection having a gelation time of 1 hour or more can be obtained.
Ａ液に含まれる珪酸ソーダの含有量は限定的ではないが、Ａ液中のＳｉＯ２濃度は１１～１５質量％程度が好ましく、１２～１４質量％程度がより好ましい。 Although the content of sodium silicate contained in liquid A is not limited, the SiO 2 concentration in liquid A is preferably about 11 to 15% by mass, more preferably about 12 to 14% by mass.
また、Ａ液に含まれる水酸化マグネシウムの含有量は限定的ではないが、Ａ液中の濃度は０．７質量％程度以上が好ましく、０．７～１．０質量％程度がより好ましい。 Further, the content of magnesium hydroxide contained in liquid A is not limited, but the concentration in liquid A is preferably about 0.7% by mass or more, more preferably about 0.7 to 1.0% by mass.
Ａ液は、珪酸ソーダ、上記水酸化マグネシウム及び水を含有すれば良いが、実質的には当該３成分のみから構成されていることが好ましい。その他、本発明の効果を損なわない範囲で従来から地盤注入用固結材の分野で公知の添加剤を添加することは可能である。 Liquid A may contain sodium silicate, the above-mentioned magnesium hydroxide, and water, but it is preferable that it is substantially composed only of these three components. In addition, it is possible to add additives conventionally known in the field of soil injection consolidation materials within a range that does not impair the effects of the present invention.
Ｂ液に含まれる酸成分としては、限定されないが、硫酸及び／又はリン酸が好ましい。これらの酸は複数種類を混合して使用することもできる。これらの酸は、酸濃度が５０～８０質量％の市販の酸溶液がそのまま使用できる。また、Ｂ液中の酸濃度としては、４０質量％程度以上が好ましく、４０～８０質量％程度がより好ましい。 The acid component contained in liquid B is not limited, but sulfuric acid and/or phosphoric acid are preferable. These acids can also be used in combination. As these acids, commercially available acid solutions having an acid concentration of 50 to 80% by mass can be used as they are. Further, the acid concentration in liquid B is preferably about 40% by mass or more, more preferably about 40 to 80% by mass.
Ｂ液には珪酸ソーダは含有されず、Ｂ液は実質的には酸成分及び水の２成分から構成されていることが好ましい。その他、本発明の効果を損なわない範囲で従来から地盤注入用固結材の分野で公知の添加剤を添加することは可能である。 It is preferable that the B solution does not contain sodium silicate and that the B solution is substantially composed of two components: an acid component and water. In addition, it is possible to add additives conventionally known in the field of soil injection consolidation materials within a range that does not impair the effects of the present invention.
Ａ液とＢ液とを混合することにより得られる本発明の地盤注入用固結材（Ｃ液）における酸成分及び水の含有量は、地盤注入用固結材の所望のＳｉＯ２含有量、ｐＨ及びゲルタイムに応じて適宜設定することができる。 The content of the acid component and water in the consolidation material for ground injection (Liquid C) of the present invention obtained by mixing Solution A and Solution B is the desired SiO 2 content of the consolidation material for ground injection, It can be set appropriately depending on the pH and gel time.
本発明の地盤注入用固結材のＳｉＯ２含有量は１１質量％以上であり、１２質量％以上が好ましく、上限値は１３質量％程度である。また、ｐＨとゲル化時間は関連しており、本発明の地盤注入用固結材は、ゲル化時間が１時間以上（緩結型）であって、ｐＨは４～８程度であることが好ましい。なお、緩結型の固結材のゲル化時間の上限値としては２４時間程度である。よって、地盤注入用固結材における水の含有量はＳｉＯ２含有量の調整の点で設定し、酸成分の含有量はｐＨ及びゲルタイムの調整の点で設定すればよい。 The SiO 2 content of the consolidation material for ground injection of the present invention is 11% by mass or more, preferably 12% by mass or more, and the upper limit is about 13% by mass. In addition, pH and gelation time are related, and the consolidation material for ground injection of the present invention should have a gelation time of 1 hour or more (slow setting type) and a pH of about 4 to 8. preferable. Note that the upper limit of the gelation time of the slow-setting material is about 24 hours. Therefore, the content of water in the consolidation material for ground injection may be set by adjusting the SiO 2 content, and the content of the acid component may be set by adjusting the pH and gel time.
Ａ液とＢ液との混合方法は限定されないが、例えば、調製用容器にＢ液を入れておき、当該Ｂ液を撹拌しながらＡ液を滴下することにより各成分を混合することが好ましい。このような混合方法を採用することにより、部分ゲルの発生を抑制しながら本発明の地盤注入用固結材を効率的に調製することができるとともに、酸成分の供給による調製用容器の腐食等の発生を効果的に抑制することができる。 Although the method of mixing the A liquid and the B liquid is not limited, it is preferable, for example, to place the B liquid in a preparation container and drop the A liquid while stirring the B liquid to mix each component. By adopting such a mixing method, it is possible to efficiently prepare the consolidation material for ground injection of the present invention while suppressing the generation of partial gel, and it is also possible to prevent corrosion of the preparation container due to the supply of acid components. The occurrence of can be effectively suppressed.
本発明の地盤注入用固結材は、原料としてコロイダルシリカを用いる必要がない。通常、地盤注入用固結材に用いられるコロイダルシリカに含まれるシリカ（ＳｉＯ２）の平均粒子径は５～３０ｎｍであり、従来この大きな平均粒子径が地盤への浸透性を不十分とする原因になっていたが、本発明ではコロイダルシリカを用いる必要がないため地盤注入時に地盤への浸透性が良好である。このような本発明の地盤注入用固結材の粘度は限定的ではないが、３．５ｍＰａ・ｓ以下が好ましい。 The consolidation material for ground injection of the present invention does not require the use of colloidal silica as a raw material. Usually, the average particle size of silica (SiO 2 ) contained in colloidal silica used as a consolidation material for ground injection is 5 to 30 nm, and in the past, this large average particle size was the cause of insufficient penetration into the ground. However, in the present invention, since there is no need to use colloidal silica, the permeability into the ground is good when it is poured into the ground. Although the viscosity of such a consolidation material for ground injection of the present invention is not limited, it is preferably 3.5 mPa·s or less.
上記工程により得られる本発明の地盤注入用固結材は、珪酸ソーダ、水酸化マグネシウム及び酸成分を含有する地盤注入用固結材であって、
（１）前記地盤注入用固結材は、ＳｉＯ２濃度が１１質量％以上であり、
（２）Ｓｉを含有する固形分の平均粒子径が０．８０ｎｍ以下であり、
（３）ゲル化時間が１時間以上である。
The consolidation material for ground injection of the present invention obtained by the above steps is a consolidation material for ground injection containing sodium silicate, magnesium hydroxide, and an acid component,
(1) The consolidation material for ground injection has a SiO 2 concentration of 11% by mass or more,
(2) The average particle diameter of the solid content containing Si is 0.80 nm or less,
(3) Gelation time is 1 hour or more.
ここで、地盤注入用固結材に含まれるＳｉを含有する固形分の平均粒子径が０．８０ｎｍ以下であることは部分ゲルの発生が抑制（許容範囲の少量のゲルの発生が認められても地盤注入用固結材の実用性に影響はない）されていることを意味し、これは調製の容易性と地盤（特に密な地盤や粘土質の地盤）への良好な浸透性の効果をもたらす。 Here, if the average particle size of the Si-containing solid content contained in the soil injection consolidation material is 0.80 nm or less, the generation of partial gel is suppressed (the generation of a small amount of gel within the acceptable range is observed). This means that the practicality of the consolidation material for ground injection is not affected), which has the effect of ease of preparation and good permeability into the ground (especially dense ground or clay ground). bring about.
本発明では、Ｓｉを含有する固形分の平均粒子径は、全自動水平型多目的Ｘ線回折装置（株式会社リガク製、製品名SmartLab）を用いて小角散乱を行い、次いで粒径・空孔径解析ソフトウェア（株式会社リガク製、製品名NANO-Solver）で球形解析することにより得られる値である。この平均粒子径は０．８０ｎｍ以下であればゲルが実質的に認められず清澄であるか又は許容範囲の少量のゲルの発生が認められても地盤注入用固結材の実用性に影響はないことを意味する。この平均粒子径は０．８０ｎｍ以下であればよいが、地盤への浸透性を考慮すると平均粒子径は小さい方が好ましく、測定可能な下限値としては０．１０ｎｍ程度である。 In the present invention, the average particle diameter of the solid content containing Si is determined by small-angle scattering using a fully automatic horizontal multipurpose X-ray diffraction device (manufactured by Rigaku Co., Ltd., product name: SmartLab), followed by particle and pore size analysis. This value is obtained by performing spherical analysis using software (manufactured by Rigaku Corporation, product name NANO-Solver). If the average particle size is 0.80 nm or less, it is clear and no gel is substantially observed, or even if a small amount of gel is observed within the acceptable range, it will not affect the practicality of the consolidation material for ground injection. It means no. The average particle diameter may be 0.80 nm or less, but in consideration of permeability into the ground, the smaller the average particle diameter is, the better, and the measurable lower limit is about 0.10 nm.
本発明では、地盤注入用固結材のゲル化時間は、室温下、５００ｍｌビーカーに地盤注入用固結材１５０ｍｌ及び３８．４ｍｍ×φ８ｍｍ回転子を入れて、初速４０ｒｐｍで回転させ、回転が停止した時間をゲル化時間とした。本発明では、ゲル化時間は１時間以上であればよいが、その中でも２～３０時間が好ましく、３～２０時間がより好ましい。 In the present invention, the gelation time of the consolidating material for ground injection is determined by placing 150 ml of the consolidating material for ground injecting and a 38.4 mm x φ8 mm rotor in a 500 ml beaker at room temperature, rotating at an initial speed of 40 rpm, and then stopping the rotation. This time was defined as the gelation time. In the present invention, the gelation time may be at least 1 hour, but preferably 2 to 30 hours, more preferably 3 to 20 hours.
本発明の地盤注入用固結材は、地盤の液状化防止注入工事、地盤補強工事等に広く利用することができる。特にコロイダルシリカを含有しない点で密な地盤及び粘土質地盤への浸透性も良好である上、ＳｉＯ２含有量は１１質量％以上であり固結強度も優れている。 The consolidating material for ground injection of the present invention can be widely used for ground liquefaction prevention injection work, ground reinforcement work, etc. In particular, since it does not contain colloidal silica, it has good permeability into dense ground and clay ground, and also has an SiO 2 content of 11% by mass or more and excellent consolidation strength.
中結型又は瞬結型の地盤注入用固結材
上記Ａ液とＢ液とを混合することにより得られる本発明の地盤注入用固結材（Ｃ液）は、ゲル化時間が１時間以上の緩結型である。当該Ｃ液に、更に珪酸ソーダ及び水を含有するＤ液を添加することにより、部分ゲルの発生を抑制しながら中結型（６０秒以上１時間未満）又は瞬結型（６０秒未満）の地盤注入用固結材をそれぞれ調製することができる。
Medium setting type or instant setting type consolidation material for ground injection The consolidation material for ground injection (C liquid) of the present invention obtained by mixing the above-mentioned liquids A and B has a gelation time of 1 hour or more. It is a slow-setting type. By further adding a D solution containing sodium silicate and water to the C solution, it is possible to suppress the formation of partial gels while producing a medium-setting type (60 seconds or more and less than 1 hour) or an instant-setting type (less than 60 seconds). Consolidation materials for ground injection can be prepared respectively.
なお、Ｄ液は珪酸ソーダ及び水の２成分からなる混合物を基本組成とし、中結型の地盤注入用固結材を調製する際は、必要に応じて、基本組成に更に酸成分を含有して３成分からなる混合物を用いてもよい。瞬結型の地盤注入用固結材を調製する場合は、酸成分は含まずに２成分からなる基本組成を使用する。酸成分の有無及びその含有量は、中結型又は瞬結型の地盤注入用固結材のゲル化時間及びシリカ濃度に応じて調整することができる。なお、珪酸ソーダ及び酸成分の説明は、上記と同じである。 The basic composition of liquid D is a mixture consisting of two components: sodium silicate and water, and when preparing a medium-setting type of consolidation material for ground injection, an acid component may be added to the basic composition as necessary. A mixture of three components may also be used. When preparing an instant setting type cementing material for ground injection, a basic composition consisting of two components without containing an acid component is used. The presence or absence of an acid component and its content can be adjusted depending on the gelation time and silica concentration of the intermediate setting type or instant setting type of soil injection consolidation material. Note that the description of sodium silicate and acid components is the same as above.
具体的には、最終的に中結型の地盤注入用固結材を得る場合には、Ｄ液中の珪酸ソーダ含有量は、ＳｉＯ２濃度として４～７質量％程度が好ましく、５～６質量％程度がより好ましい。Ｄ液中の酸濃度としては、０～２質量％程度の中で調整できる。また、最終的に得られる中結型の地盤注入用固結材としては、ＳｉＯ２濃度は６～１０質量％程度）が好ましく、ｐＨは３．４～５程度である。 Specifically, in the case of finally obtaining a medium-consolidated type of consolidating material for ground injection, the sodium silicate content in the D solution is preferably about 4 to 7 mass% as SiO 2 concentration, and 5 to 6% by mass. It is more preferably about % by mass. The acid concentration in liquid D can be adjusted within a range of about 0 to 2% by mass. Furthermore, the final intermediate solidification material for ground injection preferably has a SiO 2 concentration of about 6 to 10% by mass) and a pH of about 3.4 to 5.
また、最終的に瞬結型の地盤注入用固結材を得る場合には、Ｄ液中の珪酸ソーダ含有量は、ＳｉＯ２濃度として２～５質量％程度が好ましく、３～４質量％程度がより好ましい。また、最終的に得られる瞬結型の地盤注入用固結材としては、ＳｉＯ２濃度は６～１０質量％程度）が好ましく、ｐＨは５～８程度である。 In addition, in the case of finally obtaining an instant setting type cementing material for ground injection, the sodium silicate content in the D solution is preferably about 2 to 5% by mass as SiO 2 concentration, and about 3 to 4% by mass. is more preferable. Furthermore, the final instant-setting type cementing material for ground injection preferably has a SiO 2 concentration of about 6 to 10% by mass) and a pH of about 5 to 8.
上記の通り、一旦ＳｉＯ２含有量が１１質量％以上の地盤注入用固結材（Ｃ液）を調製した後、そこに珪酸ソーダ及び水を含有し、必要に応じて更に酸成分を含有するＤ液を添加して中結型又は瞬結型の地盤注入用固結材を調製することにより、必要成分を一度に混合して同組成の中結型又は瞬結型の地盤注入用固結材を調製する場合と比較して部分ゲルの発生を抑制しながら各地盤注入用固結材を調製することができる。 As mentioned above, once a consolidation material for ground injection (liquid C) with a SiO 2 content of 11% by mass or more is prepared, it contains sodium silicate and water, and further contains an acid component as necessary. By adding liquid D to prepare a medium-setting type or instant-setting type of soil injection consolidation material, the necessary components can be mixed at once to create a medium-setting type or instant-setting type of soil injection consolidation of the same composition. It is possible to prepare a consolidating material for each ground injection while suppressing the generation of partial gels compared to the case of preparing a solid material.
以下に実施例、比較例及び試験例を示して本発明を具体的に説明する。但し、本発明は実施例に限定されない。 The present invention will be specifically explained below by showing Examples, Comparative Examples, and Test Examples. However, the present invention is not limited to the examples.
実施例及び比較例では、下記材料を２０℃の条件で使用した。
・５号珪酸ソーダ（富士化学株式会社製）
（SiO2：25.6質量%, Na2O：7.1質量%, モル比：3.7, 富士化学（株）製）
・３号珪酸ソーダ（富士化学株式会社製）
（SiO2：29.0質量%, Na2O：9.3質量%, モル比：3.2, 富士化学（株）製）
・７８％硫酸（工業用）
・水酸化マグネシウム（和光純薬工業株式会社製）
但し、水酸化マグネシウムの平均粒子径は６９．３０ｎｍであり、水酸化マグネシウムには実質的に針状結晶は含まれていなかった。
・水（工業用）
実施例１～２及び比較例１～３（地盤注入用固結材の調製）
下記表１に示すＡ液及びＢ液を用意し、Ｂ液を１３０ｒｐｍで撹拌しながらＡ液をポンプ流量９．０５ｍＬ／ｓｅｃで滴下することにより混合し、実施例１～２及び比較例１～３の地盤注入用固結材を調製した。
In Examples and Comparative Examples, the following materials were used at 20°C.
・No. 5 Sodium Silicate (manufactured by Fuji Chemical Co., Ltd.)
(SiO 2 : 25.6% by mass, Na 2 O: 7.1% by mass, molar ratio: 3.7, manufactured by Fuji Chemical Co., Ltd.)
・No. 3 Sodium Silicate (manufactured by Fuji Chemical Co., Ltd.)
(SiO 2 : 29.0 mass%, Na 2 O: 9.3 mass%, molar ratio: 3.2, manufactured by Fuji Chemical Co., Ltd.)
・78% sulfuric acid (industrial use)
・Magnesium hydroxide (manufactured by Wako Pure Chemical Industries, Ltd.)
However, the average particle diameter of the magnesium hydroxide was 69.30 nm, and the magnesium hydroxide did not substantially contain needle-shaped crystals.
・Water (industrial)
Examples 1 to 2 and Comparative Examples 1 to 3 (preparation of consolidation material for ground injection)
Prepare liquids A and B shown in Table 1 below, and mix liquid A by dropping liquid A at a pump flow rate of 9.05 mL/sec while stirring liquid B at 130 rpm. Examples 1-2 and Comparative Examples 1- 3. Consolidation material for ground injection was prepared.
各地盤注入用固結材の特徴を表１に併せて示す。なお、ゲルタイムはカップ倒立法により測定した。本明細書における地盤注入用固結材の性状の評価基準は下記の通りである。 Table 1 also shows the characteristics of each solidifying material for ground injection. The gel time was measured using an inverted cup method. The evaluation criteria for the properties of the cementing material for ground injection in this specification are as follows.
○：ゲルが実質的に認められず清澄である
△：許容範囲の少量のゲルの発生が認められる（実用性あり）
×：多量のゲルの発生が認められる（実用性なし）
○: Clear with virtually no gel observed △: A small amount of gel within an acceptable range is observed (practical)
×: Generation of a large amount of gel is observed (not practical)
表１の結果によれば、所定のＡ液とＢ液とを混合して得られる実施例１～２の地盤注入用固結材は、いずれもＳｉＯ２濃度が１１質量％以上であるが、ゲルの発生が認められないか又は許容範囲内のゲルの発生に留まっており、実用性がある。 According to the results in Table 1, the consolidation materials for ground injection of Examples 1 and 2 obtained by mixing predetermined liquids A and B all have a SiO 2 concentration of 11% by mass or more, but No gel formation was observed, or the gel formation remained within an acceptable range, so it is practical.
これに対して、水酸化マグネシウムを使用しない比較例２の地盤注入用固結材は、ＳｉＯ２濃度が１２質量％では許容範囲を超える多量のゲルが生じたため、実用性がない。 On the other hand, the consolidation material for ground injection of Comparative Example 2, which does not use magnesium hydroxide, is not practical because a large amount of gel exceeding the allowable range was produced when the SiO 2 concentration was 12% by mass.
比較例３の地盤注入用固結材は、Ａ液に水酸化マグネシウムを使用せず、且つ、５号珪酸ナトリウムをＡ液及びＢ液の両方に配合して調製したものであり、許容範囲を超える多量のゲルが生じたため、実用性がない。 The consolidating material for ground injection in Comparative Example 3 was prepared without using magnesium hydroxide in liquid A, and by blending No. 5 sodium silicate into both liquids A and B, and within the allowable range. Since a large amount of gel was generated, it is not practical.
実施例３（瞬結型の地盤注入用固結材の調製）
実施例１で調製した地盤注入用固結材を２００ｇ用意し、そこに５号珪酸ナトリウム１３．２ｇ及び水９０．０ｇからなる希釈５号珪酸ナトリウムを添加することにより瞬結型の地盤注入用固結材を調製した。
Example 3 (Preparation of instant setting type cementing material for ground injection)
Prepare 200g of the consolidation material for ground injection prepared in Example 1, and add thereto a diluted No. 5 sodium silicate consisting of 13.2g of No. 5 sodium silicate and 90.0g of water to create an instant-setting type ground injection consolidator. A consolidation material was prepared.
得られた地盤注入用固結材の特徴は下記表２に示す通りである。 The characteristics of the obtained solidifying material for ground injection are shown in Table 2 below.
実施例４（中結型の地盤注入用固結材の調製）
実施例１で調製した地盤注入用固結材を１９７．４ｇ用意し、そこに７８％硫酸２．６ｇを添加し、更にそこに５号珪酸ナトリウム２５．９ｇ及び水８０．４ｇからなる希釈５号珪酸ナトリウムを添加することにより中結型の地盤注入用固結材を調製した。
Example 4 (Preparation of medium-consolidation type consolidation material for ground injection)
197.4 g of the ground injection consolidation material prepared in Example 1 was prepared, 2.6 g of 78% sulfuric acid was added thereto, and dilution 5 consisting of 25.9 g of No. 5 sodium silicate and 80.4 g of water was added. A medium-consolidation material for ground injection was prepared by adding sodium silicate.
得られた地盤注入用固結材の特徴は下記表２に示す通りである。 The characteristics of the obtained solidifying material for ground injection are shown in Table 2 below.
比較例４（中結型の地盤注入用固結材の調製）
５号珪酸ナトリウム１１９．８４ｇ及び水８０．１６ｇからなるＡ液と、７８％硫酸１６．２ｇ及び水９０．４７ｇからなるＢ液とを混合する従来法（Ｂ液にＡ液を混合）によって、ＳｉＯ２濃度が１０質量％の中結型の地盤注入用固結材を調製した。
Comparative Example 4 (Preparation of medium-consolidation type consolidating material for ground injection)
By the conventional method of mixing liquid A consisting of 119.84 g of No. 5 sodium silicate and 80.16 g of water and liquid B consisting of 16.2 g of 78% sulfuric acid and 90.47 g of water (mixing liquid A with liquid B), A medium-set type solidifying material for ground injection having a SiO 2 concentration of 10% by mass was prepared.
得られた地盤注入用固結材の特徴は下記表２に示す通りである。 The characteristics of the obtained solidifying material for ground injection are shown in Table 2 below.
比較例４は従来法で調製した中結型の地盤注入用固結材であり、ＳｉＯ２濃度が１０質量％，ゲルタイム２０分の条件で性状が×であることが分かる。従来法で調製する限り、ＳｉＯ２濃度が１０質量％においてゲルタイムが２０分以下の条件はいずれも性状が×になることが分かっている。 It can be seen that Comparative Example 4 is a medium-set type solidifying material for ground injection prepared by a conventional method, and its properties are poor under the conditions of a SiO 2 concentration of 10% by mass and a gel time of 20 minutes. It is known that as long as the conventional method is used for preparation, the properties will be poor under any conditions where the SiO 2 concentration is 10% by mass and the gel time is 20 minutes or less.
試験例１（固結体の作製及び一軸圧縮強さの測定）
実施例１、比較例１～２で作製した３種の地盤注入用固結材を用いて固結体（供試体）を作製し、一軸圧縮強度を測定した。具体的には、豊浦硅砂を用いてＤｒ＝５０、φ＝５０ｍｍ、ｈ＝１００ｍｍで水中落下法により固結体を作製し、材令７日及び２８日で一軸圧縮強さを測定した。
Test example 1 (preparation of solidified body and measurement of unconfined compressive strength)
Consolidated bodies (specimens) were produced using the three types of consolidating materials for ground injection produced in Example 1 and Comparative Examples 1 and 2, and the unconfined compressive strength was measured. Specifically, a consolidated body was prepared by an underwater drop method using Toyoura silica sand with Dr=50, φ=50 mm, and h=100 mm, and the uniaxial compressive strength was measured at 7 days and 28 days.
結果を図２に示す。図２によれば、実施例１の地盤注入用固結材を用いて作製した固結体（以下、「実施例１の固結体」という。他も同様。）は、材令２８日で目標値の８００ｋＮ／ｍ２を達成した。この数値は、比較例１の固結体と比べて、材令７日では約４２％、材令２８日では約３４％高い強度であった。 The results are shown in Figure 2. According to FIG. 2, the consolidated body produced using the consolidation material for ground injection of Example 1 (hereinafter referred to as "the consolidated body of Example 1". The same applies to the others) was aged 28 days. The target value of 800kN/ m2 was achieved. This numerical value was about 42% higher in strength at 7 days old and about 34% higher at 28 days old than the consolidated body of Comparative Example 1.
なお、同じＳｉＯ２濃度で比較すると、水酸化マグネシウムに含まれる添加物の影響と推測されるが、実施例１の固結体は比較例２の固結体と比べて強度はやや劣るが、材令７日では約１６％低かった強度が、材令２８日では約６％の低下に留まった。これは、水酸化マグネシウムを添加した実施例１の地盤注入用固結材のゲルタイムが長く、硬化までに時間を要するためと推測される。実施例１と比較例２の固結体を比較すると、材令２８日以降ではほぼ遜色ない強度が得られている。 In addition, when compared at the same SiO 2 concentration, the strength of the solidified body of Example 1 is slightly inferior to that of Comparative Example 2, although it is presumed that this is due to the influence of additives contained in magnesium hydroxide. The strength was about 16% lower when the wood was 7 days old, but it was only about 6% lower when the wood was 28 days old. This is presumed to be because the gel time of the soil injection consolidation material of Example 1 to which magnesium hydroxide was added is long, and it takes time to harden. Comparing the consolidated bodies of Example 1 and Comparative Example 2, almost comparable strength was obtained after the age of 28 days.
Claims (6)
（１）前記地盤注入用固結材は、ＳｉＯ２濃度が１１質量％以上であり、
（２）Ｓｉを含有する固形分の平均粒子径が０．８０ｎｍ以下であり、
（３）ゲル化時間が１時間以上である、
ことを特徴とする地盤注入用固結材。 A consolidation material for ground injection containing sodium silicate, magnesium hydroxide, and an acid component,
(1) The consolidation material for ground injection has a SiO 2 concentration of 11% by mass or more,
(2) The average particle diameter of the solid content containing Si is 0.80 nm or less,
(3) The gelation time is 1 hour or more.
Consolidation material for ground injection characterized by:
（１）前記地盤注入用固結材は、ＳｉＯ２濃度が１１質量％以上であり、
（２）（i）珪酸ソーダ、水酸化マグネシウム及び水を含有するＡ液と、（ii）酸成分及び水を含有し且つ珪酸ソーダを含有しないＢ液と、を混合してＣ液を得る工程を有し、前記Ａ液を調製する原料としての水酸化マグネシウムは実質的に針状結晶を含有しない、
ことを特徴とする製造方法。 A method for manufacturing a consolidation material for ground injection according to claim 1 or 2, comprising:
(1) The consolidation material for ground injection has a SiO 2 concentration of 11% by mass or more,
(2) A step of obtaining liquid C by mixing (i) liquid A containing sodium silicate, magnesium hydroxide, and water, and (ii) liquid B containing an acid component and water but not containing sodium silicate. and the magnesium hydroxide as a raw material for preparing the liquid A does not substantially contain needle crystals.
A manufacturing method characterized by:
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