JP3429899B2 - Silicate soil stabilization chemicals and ground stabilization method using the same - Google Patents
Silicate soil stabilization chemicals and ground stabilization method using the sameInfo
- Publication number
- JP3429899B2 JP3429899B2 JP10459995A JP10459995A JP3429899B2 JP 3429899 B2 JP3429899 B2 JP 3429899B2 JP 10459995 A JP10459995 A JP 10459995A JP 10459995 A JP10459995 A JP 10459995A JP 3429899 B2 JP3429899 B2 JP 3429899B2
- Authority
- JP
- Japan
- Prior art keywords
- silicate
- liquid
- chemical
- ground
- bicarbonate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、珪酸塩系土質安定用薬
液およびこれを用いた地盤安定化工法に関する。詳しく
は、アルカリ珪酸塩水溶液と重炭酸塩水溶液とを組み合
わせてなる、ゲルタイムが10数秒から数分の範囲である
緩結型土質安定用薬液、およびこれを用いた地盤安定化
工法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silicate-based soil stabilizing chemical and a ground stabilization method using the same. More specifically, the present invention relates to a slow-setting type soil stabilization chemical solution having a gel time in the range of 10 seconds to several minutes, which is obtained by combining an alkali silicate aqueous solution and a bicarbonate aqueous solution, and a ground stabilization method using the same.
【０００２】[0002]
【従来の技術】従来、軟弱地盤を強化したり、漏水地盤
を止水するために、種々の薬液を地盤内に注入して地盤
中で硬化させる地盤安定化工法が知られているが、特に
アルカリ珪酸塩水溶液を主剤液とし、これと硬化剤とを
組み合わせた薬液からなる、いわゆる珪酸塩系グラウト
は、安価であること、他のグラウトと比較して公害を起
こす恐れが小さいこと、などの特長があり、現在広く実
用化されている。そして、ゲルタイムが10数秒から数分
の範囲である、いわゆる緩結型に調整した薬液を用いた
地盤安定化工法では、薬液が地盤内の土壌粒子の間隙に
充分に浸透するので、薬液と土壌との混合状態が良く、
確実な地盤安定化処理が行えることが知られている。2. Description of the Related Art Conventionally, a ground stabilization method is known in which various chemicals are injected into the ground and hardened in the ground in order to strengthen the soft ground or stop water leakage. So-called silicate-based grout, which consists of an alkaline silicate aqueous solution as the main agent solution and a chemical solution in which it is combined with a curing agent, is inexpensive, and is less likely to cause pollution than other grouts. It has features and is now widely used. And the gel time is in the range of 10 seconds to several minutes, in the ground stabilization method using a so-called slow-setting type chemical solution, since the chemical solution sufficiently penetrates into the gap between the soil particles in the ground, the chemical solution and the soil Mixed well with
It is known that reliable ground stabilization treatment can be performed.
【０００３】一方、珪酸塩系グラウト用の硬化剤として
は、従来種々の物質が提案されているが、危険性が無く
て取扱いが容易なこと、その使用量を変えることで薬液
のゲルタイムを数秒から数分の範囲、いわゆる瞬結型か
ら緩結型まで幅広く調整できることなどの点から、重炭
酸塩からなる硬化剤が広く用いられている。On the other hand, various substances have been conventionally proposed as a curing agent for silicate grout, but they are easy to handle without danger, and the gel time of a chemical solution can be changed to several seconds by changing the amount used. The curing agent made of a bicarbonate is widely used because it can be adjusted in a wide range from a few minutes to a so-called instantaneous setting type to a slow setting type.
【０００４】[0004]
【発明が解決しようとする課題】しかし、従来の重炭酸
塩からなる硬化剤を用いた珪酸塩系土質安定用薬液は、
アルカリ珪酸塩に対する硬化剤の使用量を変えて、薬液
のゲルタイムを10数秒から数分の範囲、いわゆる緩結型
に調整して用いた場合には、この薬液を用いて安定化処
理した地盤の強度が低くて処理された地盤を切削したと
きに該地盤が崩壊したり、形成された硬化体が水を分離
して収縮する離漿現象が著しくて硬化体に亀裂を生じる
などの問題点があった。However, the conventional silicate-based soil stabilization chemicals using a curing agent composed of bicarbonate are
When the amount of the curing agent used for the alkali silicate is changed to adjust the gel time of the chemical solution to a range of 10 seconds to several minutes, that is, a so-called slow-cure type, when using the chemical solution to stabilize the ground, When the ground treated with low strength is cut, the ground collapses, and the hardened body formed has a syneresis phenomenon in which water separates and contracts, resulting in cracks in the hardened body. there were.
【０００５】本発明の目的は、従来の重炭酸塩からなる
硬化剤を用いた珪酸塩系土質安定用薬液の上記問題点を
改善し、ゲルタイムが10数秒から数分の範囲、いわゆる
緩結型に調整され、形成される硬化体の強度の発現が良
好で、かつ、離漿現象が少ない、珪酸塩系土質安定用薬
液および地盤安定化工法を提供することにある。The object of the present invention is to improve the above-mentioned problems of conventional silicate-based soil stabilizing chemicals using a curing agent composed of bicarbonate, and to provide a so-called slow-setting type gel time in the range of 10 to several minutes. It is an object of the present invention to provide a silicate-based soil stabilization chemical solution and a ground stabilization method, in which the strength of a cured product formed by adjusting to the above is good and the syneresis phenomenon is small.
【０００６】本発明の珪酸塩系土質安定用薬液および地
盤安定化工法を見いだすにあたっての、目的とする薬液
の性能基準を次のとおりとし、これらの性能基準をいず
れも満たしたとき、本発明の目的が達成されたとした。
アルカリ珪酸塩として、日本工業規格(JIS K-1408)に規
定されている３号珪酸ソーダを用い、３号珪酸ソーダ80
リットルと水 120リットルの割合で混合して調製した水
溶液を主剤液 (Ａ液) としたとき、硬化剤を含む水溶液
をＢ液として、Ａ液とＢ液とを等量ずつ混合して得られ
た薬液が、温度20℃において;
(1) 混合された後、10秒以上の時間で硬化 (ゲル化) す
ること．
(2) ゲル化して１日間経過後における、形成された硬化
体 (ホモゲル体) の一軸圧縮強度値が、 0.10 kg／cm2
以上であること．
(3) ゲル化して１日間経過後における、離漿水 (硬化体
から分離して生成した水) の量が、前記薬液の15容量％
相当量以下であること．When the silicate-based soil stabilization chemicals and ground stabilization method of the present invention are to be found, the performance criteria of the intended chemicals are as follows, and when these performance criteria are satisfied, It was said that the purpose was achieved.
As the alkali silicate, No. 3 sodium silicate specified in Japanese Industrial Standards (JIS K-1408) is used, and No. 3 sodium silicate 80
When an aqueous solution prepared by mixing liters and water at a ratio of 120 liters is used as a main agent liquid (liquid A), an aqueous solution containing a curing agent is used as liquid B, and liquids A and B are mixed in equal amounts. The chemical solution at a temperature of 20 ℃; (1) After being mixed, it should cure (gel) for 10 seconds or longer. (2) The uniaxial compressive strength value of the formed cured product (homogel product) after 1 day from gelation is 0.10 kg / cm 2
That is all. (3) The amount of syneresis water (water separated from the cured product) after 1 day from gelation is 15% by volume of the above-mentioned chemical solution.
Must be below a considerable amount.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、前記問題
点を改善し課題を解決すべく鋭意検討した結果、珪酸塩
系土質安定用薬液において、アルカリ珪酸塩水溶液と組
み合わせる硬化剤として、重炭酸ナトリウムと重炭酸カ
リウムとを特定範囲の量比で配合してなる混合物を、薬
液中の珪酸分に対して特定範囲の量比で用いることによ
り、意外にも、前記の性能基準をいずれも満たすことを
知り、本発明を完成した。Means for Solving the Problems As a result of intensive studies to improve the above problems and solve the problems, the present inventors have found that in a silicate-based soil stabilizing chemical solution, as a curing agent to be combined with an aqueous alkali silicate solution, Surprisingly, by using a mixture prepared by mixing sodium bicarbonate and potassium bicarbonate in a specific ratio in a specific range with a specific ratio in the specific range with respect to the silicic acid content in the chemical solution, any of the above performance criteria can be satisfied. The inventors have completed the present invention knowing that they also satisfy.
【０００８】本発明の第一の発明は「アルカリ珪酸塩水
溶液と重炭酸塩水溶液とを組み合わせてなる、ゲルタイ
ムが10数秒から数分の範囲である緩結型土質安定用薬液
であって、前記重炭酸塩がナトリウム塩とカリウム塩と
の混合物であり、その量比が重量比で重炭酸ナトリウ
ム：重炭酸カリウム＝56：44〜75：25の範囲であって、
かつ、薬液中のSiＯ2 分 100重量部あたり重炭酸塩40〜
60重量部の範囲で組み合わせてなることを特徴とする珪
酸塩系土質安定用薬液。」を要旨とする。A first invention of the present invention is a slow-moving type soil stabilizing chemical solution which comprises a combination of an aqueous solution of alkali silicate and an aqueous solution of bicarbonate and has a gel time of 10 seconds to several minutes. The bicarbonate salt is a mixture of sodium salt and potassium salt, and the weight ratio thereof is in the range of sodium bicarbonate: potassium bicarbonate = 56: 44 to 75:25 by weight.
And, 40 parts of bicarbonate per 100 parts by weight of SiO 2 in the chemical solution
A silicate-based soil stabilizing chemical characterized by being combined in an amount of 60 parts by weight. Is the gist.
【０００９】また、第二の発明は「珪酸塩系土質安定用
薬液を地盤内に注入し、地盤内で硬化させて地盤を安定
化させるにあたり、前記薬液として請求項１記載の珪酸
塩系土質安定用薬液を用いることを特徴とする地盤安定
化工法。」を要旨とする。A second aspect of the present invention is the "silicate-based soil material according to claim 1, which is used as the chemical solution for injecting a silicate-based soil stabilizing chemical solution into the ground and hardening it to stabilize the ground. The ground stabilization method is characterized by using a stabilizing chemical. "
【００１０】以下、本発明について説明する。本発明の
珪酸塩系土質安定用薬液の主剤としてのアルカリ珪酸塩
は、従来から珪酸塩系グラウトに用いられているもの、
たとえば、日本工業規格(JIS K-1408)に規定されている
１〜３号珪酸ソーダ、または SiO2 ／Na2 Ｏ (モル比)
が４〜100 の範囲であるシリカゾルなどを用いることが
できる。また、商品名「ニトロック」 (日東化学工業社
製) を用いることもできる。The present invention will be described below. The alkali silicate as the main ingredient of the silicate-based soil stabilizing chemical of the present invention is one that has been conventionally used for silicate-based grout,
For example, No. 1 to 3 sodium silicate specified in Japanese Industrial Standards (JIS K-1408), or SiO 2 / Na 2 O (molar ratio)
Silica sol having a ratio of 4 to 100 can be used. Further, the trade name “Nitroc” (manufactured by Nitto Kagaku Kogyo Co., Ltd.) can also be used.
【００１１】これらは、使用時に更に水で希釈して、地
盤安定化用薬液に適した適宜の濃度とし、主剤液 (Ａ
液) とする。たとえば、３号珪酸ソーダを用いた場合に
は、Ａ液と硬化剤水溶液 (Ｂ液) とを適宜の量比で混合
して得られた薬液 400リットルあたり、珪酸ソーダ70〜
120 リットル、好ましくは80〜100 リットルの割合とな
るように調整して用いる。薬液 400リットルあたりの珪
酸ソーダの量が、70リットルより少ないか、または 120
リットルよりも多いときには、いずれも、形成される硬
化体の圧縮強度が低くて地盤安定化が不充分となる。本
発明の珪酸塩系土質安定用薬液において、固結強度の良
好な発現性を得るためには、Ａ液 100重量部あたりに含
まれるSiＯ2 分は、８〜24重量部、好ましくは10〜20重
量部の範囲とすることがよい。These are further diluted with water at the time of use to have an appropriate concentration suitable for the ground stabilization chemical solution, and the main solution (A
Liquid). For example, when No. 3 sodium silicate is used, 70 parts of sodium silicate per 400 liters of the chemical liquid obtained by mixing the liquid A and the curing agent aqueous solution (liquid B) in an appropriate amount ratio.
It is adjusted to a ratio of 120 liters, preferably 80-100 liters. Amount of sodium silicate per 400 liters of chemical solution is less than 70 liters or 120
When the amount is larger than liter, the compression strength of the cured product formed is low and the ground stabilization becomes insufficient. In the silicate-based soil stabilizing chemical of the present invention, in order to obtain a good solidifying strength, the SiO 2 content in 100 parts by weight of solution A is 8 to 24 parts by weight, preferably 10 to 20 parts by weight. It is preferable to set the range to 20 parts by weight.
【００１２】本発明の珪酸塩系土質安定用薬液における
硬化剤は、重炭酸ナトリウムと重炭酸カリウムとの二種
類からなり、その量比は、重炭酸ナトリウム：重炭酸カ
リウム（重量比）＝56：44〜75：25の範囲である。硬化
剤組成として規定した上記範囲に対して、硬化剤 100重
量部あたりの重炭酸ナトリウムが、56重量部よりも少な
いとき、または75重量部よりも多いときには、いずれも
形成された硬化体の強度や離漿水に関して前記の性能基
準を満たさず、本発明の目的を達成することができな
い。本発明の珪酸塩系土質安定用薬液における硬化剤と
しての重炭酸ナトリウムと重炭酸カリウムとは、一般に
市販されているものを用いることができる。The hardener in the silicate-based soil stabilizing chemical of the present invention comprises two kinds of sodium bicarbonate and potassium bicarbonate, and the amount ratio thereof is sodium bicarbonate: potassium bicarbonate (weight ratio) = 56. : 44 to 75:25. When the amount of sodium bicarbonate per 100 parts by weight of the curing agent is less than 56 parts by weight or more than 75 parts by weight relative to the above range specified as the curing agent composition, the strength of the formed cured product is The above-mentioned performance criteria are not satisfied with respect to syneresis and syneresis water, and the object of the present invention cannot be achieved. As the sodium bicarbonate and potassium bicarbonate as the curing agents in the silicate-based soil stabilization chemicals of the present invention, commercially available products can be used.
【００１３】本発明の珪酸塩系土質安定用薬液におい
て、硬化剤としての重炭酸塩の使用量は、薬液中のSiＯ
2 分 100重量部あたり重炭酸塩40〜60重量部の範囲で組
み合わせることがよい。本発明の珪酸塩系土質安定用薬
液における硬化剤組成物の水溶液 (Ｂ液) は、Ａ液とＢ
液とを適宜の量比で混合して得られた薬液 400リットル
あたり、たとえば、３号珪酸ソーダ80リットルを含む場
合には、硬化剤組成物の重量が13kg以上ないし20kg未満
の範囲となるように調製する。上記範囲内で、硬化剤組
成物の使用量を多くすると薬液のゲルタイムを短く、一
方、少なくすると薬液のゲルタイムを長く調整すること
ができる。硬化剤の使用量が、規定した範囲を外れて、
少ないときには形成された硬化体の強度に関して、一
方、多いときには薬液のゲルタイムに関して、それぞれ
前記の性能基準を満たさず、いずれも本発明の目的を達
成することができない。In the silicate-based soil stabilizing chemical of the present invention, the amount of bicarbonate used as the curing agent is determined by the amount of SiO 2 in the chemical.
2 minutes 100 parts by weight of bicarbonate may be combined in the range of 40 to 60 parts by weight. The aqueous solution (B liquid) of the curing agent composition in the silicate-based soil stabilizing chemicals of the present invention comprises A liquid and B liquid.
For example, in the case of containing 80 liters of No. 3 sodium silicate per 400 liters of the chemical liquid obtained by mixing the liquid with an appropriate amount ratio, the weight of the curing agent composition should be in the range of 13 kg or more and less than 20 kg. To prepare. Within the above range, the gel time of the chemical liquid can be shortened by increasing the amount of the curing agent composition used, while the gel time of the chemical liquid can be adjusted by increasing the amount of the curing agent composition. The amount of curing agent used is outside the specified range,
When the amount is small, the strength of the formed cured product is not satisfied, and when the amount is large, the above-mentioned performance criteria are not satisfied with respect to the gel time of the chemical liquid, and neither of them can achieve the object of the present invention.
【００１４】本発明の地盤安定化工法は、主剤としての
アルカリ珪酸塩と水とを混合してＡ液を、また、本発明
で規定した硬化剤組成物と水とを混合してＢ液を、それ
ぞれ調製し、調製されたＡ液とＢ液とを適宜の比率で混
合して得られた薬液を地盤内に注入して硬化させ、地盤
を安定化させる方法を例示することができる。薬液の地
盤内注入に際しては、単管式、二重管式、多重管式など
の各種注入管を用いることができ、また、Ａ液とＢ液と
を予め混合して注入管に導く方法、Ａ液とＢ液とを注入
管の基部に設けた混合部- たとえば、Ｙ字管において混
合して注入管に導く方法、Ａ液とＢ液とをそれぞれ独立
に注入管に導いて注入管内で混合する方法、あるいは、
Ａ液とＢ液とをそれぞれ独立に注入管に導いて、注入管
から地盤内に注入しながら地盤内において合流・混合さ
せる等、適宜の方法を、薬液のゲルタイムや施工性に応
じて採用することができる。In the ground stabilization method of the present invention, an alkali silicate as a main component and water are mixed to obtain a liquid A, and a curing agent composition defined in the present invention is mixed with water to obtain a liquid B. A method of stabilizing the ground by injecting into the ground a liquid medicine prepared by mixing the prepared liquid A and liquid B at an appropriate ratio to cure the liquid can be exemplified. When injecting the chemical liquid into the ground, various injection pipes such as a single pipe type, a double pipe type, and a multi-pipe type can be used, and a method in which the A liquid and the B liquid are mixed in advance and introduced into the injection pipe, Mixing part in which liquid A and liquid B are provided at the base of the injection pipe-for example, a method of mixing in a Y-shaped tube to guide the liquid into the injection pipe, or a method in which liquid A and liquid B are separately introduced into the injection pipe and Method of mixing, or
Appropriate methods are adopted depending on the gel time of the chemical solution and the workability, such as introducing the liquid A and the liquid B to the injection pipes independently, and merging and mixing in the ground while injecting the liquids from the injection pipes into the ground. be able to.
【００１５】[0015]
【実施例】次に、実施例および比較例によって、本発明
を具体的に説明する。本発明は、これら実施例に限定さ
れるものではない。
実施例および比較例
・Ａ液… JIS３号珪酸ソーダ80リットルに水 120リット
ルを加えて調製した。
・Ｂ液…重炭酸ナトリウムと重炭酸カリウム (いずれも
試薬１級を用いた) とを種々の配合比で組み合わせ、容
量が 200リットルとなるように水を加えて溶解し、Ｂ液
とした。
上記のようにして調製したＡ液とＢ液の各50リットルず
つを、温度20℃において混合し、硬化させてホモゲル体
を得た。EXAMPLES Next, the present invention will be specifically described with reference to Examples and Comparative Examples. The present invention is not limited to these examples. Examples and Comparative Examples Liquid A ... Prepared by adding 120 liters of water to 80 liters of JIS No. 3 sodium silicate. Solution B: Sodium bicarbonate and potassium bicarbonate (both using the reagent first grade) were combined at various mixing ratios, and water was added to dissolve the solution to a volume of 200 liters to prepare solution B. 50 liters of each of solution A and solution B prepared as described above were mixed at a temperature of 20 ° C. and cured to obtain a homogel body.
【００１６】各試験における、硬化剤組成物の重炭酸ナ
トリウムと重炭酸カリウムとの重量比、Ｂ液中ならびに
Ａ液とＢ液との混合液（薬液) 中の硬化剤組成物の配合
処方と、薬液の性能評価項目として、Ａ液とＢ液との混
合液の硬化時間（薬液のゲルタイム）、ゲル化して１日
間経過後における、形成された硬化体 (ホモゲル体)の
一軸圧縮強度と離漿水の生成率 (Ａ液とＢ液との混合液
に対する容積比, ％)の、それぞれについての測定結果
と評価および総合評価を、表１に示した。In each test, the weight ratio of sodium bicarbonate and potassium bicarbonate in the curing agent composition, the compounding formulation of the curing agent composition in the liquid B and the mixed liquid (chemical liquid) of the liquids A and B, and As the performance evaluation items of the chemical solution, the curing time of the mixed solution of the solution A and the solution B (gel time of the chemical solution), the uniaxial compressive strength of the formed cured body (homogel body) and the separation after 1 day from gelation Table 1 shows the measurement results, the evaluation, and the comprehensive evaluation of the production rate of serous water (volume ratio to the mixed solution of solution A and solution B,%).
【００１７】薬液性能の各評価項目の試験方法と判断基
準は、次のとおりである。・薬液の硬化時間… 液温20
℃において、等容量のＡ液とＢ液とをよく混合して容器
内に静置し、混合液の流動性がなくなるまでの所要時間
を薬液の硬化時間とした。 評価 ○… 硬化時間
が、10秒以上であった。
×… 硬化時間が、10秒未満であった。The test methods and judgment criteria for each evaluation item of chemical performance are as follows.・ Curing liquid curing time ... Liquid temperature 20
At C, liquids A and B of equal volume were thoroughly mixed and allowed to stand in a container, and the time required until the fluidity of the liquid mixture disappeared was defined as the curing time of the chemical liquid. Evaluation: The curing time was 10 seconds or more. X: The curing time was less than 10 seconds.
【００１８】・硬化体の一軸圧縮強度… 温度20℃にお
いて、Ａ液とＢ液の等容量の混合液を円柱型の型枠 (径
５cm×高さ10cm) 内に流し込み、形成された硬化体の材
令１日の一軸圧縮強度値を測定した。
評価 ○… 一軸圧縮強度の値が、 0.10 kg／cm2 以上
であった。
×… 一軸圧縮強度の値が、 0.10 kg／cm2 未満であっ
た。Uniaxial compressive strength of a cured product: A cured product formed by pouring a mixed liquid of an equal volume of liquid A and liquid B into a cylindrical mold (diameter 5 cm x height 10 cm) at a temperature of 20 ° C. The uniaxial compressive strength value of the material for 1 day was measured. Evaluation ○: The value of uniaxial compressive strength was 0.10 kg / cm 2 or more. × ... The value of uniaxial compressive strength was less than 0.10 kg / cm 2 .
【００１９】・離漿水… 温度20℃において、Ａ液とＢ
液との等容量の混合液 100mlをメスシリンダー (容量 1
00ml) 内に入れて静置し、１日間経過後において生成し
た離漿水の容量を測定し、Ａ液とＢ液との混合液の容量
に対する容積比 (％) を離漿水の生成率として評価し
た。
評価 ○… 離漿水の生成率が、15容量％以下であっ
た。
×… 離漿水の生成率が、15容量％量を超えた。・ Synergized water: A liquid and B liquid at a temperature of 20 ° C.
Equilibrate 100 ml of the mixed solution with a measuring cylinder (volume 1
(00 ml) and leave it still for 1 day, and measure the volume of the syneresis water generated after 1 day. Determine the volume ratio (%) to the volume of the mixture of A and B solutions. Evaluated as. Evaluation ○ ... The production rate of the syneresis water was 15% by volume or less. × ... The production rate of syneresis exceeds 15% by volume.
【００２０】・総合評価
○… 硬化時間、一軸圧縮強度、離漿水の評価が、全て
○であった。
×… 評価項目の少なくとも一つが、×であった。-Comprehensive evaluation: The curing time, uniaxial compressive strength, and syneresis water were all evaluated as ◯. X: At least one of the evaluation items was x.
【００２１】[0021]
【表１】 [Table 1]
【００２２】実験１〜８は、硬化剤組成物における重炭
酸ナトリウムと重炭酸カリウムの重量比の、薬液の性能
への影響を示す。硬化剤組成物における重炭酸ナトリウ
ムの量比が、本発明の規定範囲よりも少ないとき (実験
１〜３) 、一方、規定範囲よりも多いとき (実験７およ
び８) には、形成された硬化体の一軸圧縮強度や離漿水
の生成率に関して、それぞれ前記の薬液の性能基準を満
たさず、いずれも本発明の目的を達成することができな
かった。Experiments 1 to 8 show the effect of the weight ratio of sodium bicarbonate and potassium bicarbonate in the hardener composition on the performance of the chemical solution. When the amount ratio of sodium bicarbonate in the curing agent composition was less than the specified range of the present invention (Experiments 1-3), while it was more than the specified range (Experiments 7 and 8), the formed curing Regarding the uniaxial compressive strength and the syneresis rate of the body, the performance criteria of the above-mentioned chemicals were not satisfied, respectively, and none of them could achieve the object of the present invention.
【００２３】実験９〜13は、Ａ液とＢ液とを混合して得
た薬液中の硬化剤量の、薬液の性能への影響を示す。Ａ
液とＢ液とを混合して得た薬液中のSiＯ2 分 100重量部
あたりの硬化剤の量が、本発明の規定範囲の下限値- 40
重量部よりも少ないときには(実験９) 、形成された硬
化体の一軸圧縮強度に関して、一方、本発明の規定範囲
の上限値- 60重量部を超えるときには (実験13) 薬液の
硬化時間に関して、それぞれ前記の薬液の性能基準を満
たさず、いずれも本発明の目的を達成することができな
かった。Experiments 9 to 13 show the influence of the amount of the curing agent in the chemical liquid obtained by mixing the liquid A and the liquid B on the performance of the chemical liquid. A
The amount of the curing agent per 100 parts by weight of SiO 2 in the chemical liquid obtained by mixing the liquid B and the liquid B is the lower limit of the specified range of the present invention.
When the amount is less than the weight part (Experiment 9), the uniaxial compressive strength of the formed cured product is exceeded. On the other hand, when the amount exceeds the upper limit value of the present invention −60 parts by weight (Experiment 13) The performance criteria of the above chemicals were not satisfied, and none of them could achieve the object of the present invention.
【００２４】これに対して、本発明の要件を満たした場
合には (実験４〜６，10〜12) 、Ａ液とＢ液とを混合し
て得た薬液は、硬化時間が10秒以上であり、ゲル化して
１日間経過後における、形成された硬化体の一軸圧縮強
度値が 0.10 kg／cm2 以上であり、かつ、離漿水の生成
率が15容量％以下であって、いずれも前記の薬液の性能
基準を満たし本発明の目的を達成することができた。On the other hand, when the requirements of the present invention are satisfied (Experiments 4 to 6, 10 to 12), the chemical liquid obtained by mixing the liquids A and B has a curing time of 10 seconds or more. The uniaxial compressive strength value of the formed cured product after one day from gelation is 0.10 kg / cm 2 or more, and the syneresis rate is 15% by volume or less. Also satisfied the above-mentioned performance criteria of the chemical solution and was able to achieve the object of the present invention.
【００２５】[0025]
【発明の効果】本発明の珪酸塩系土質安定用薬液および
地盤安定化工法により、薬液のゲルタイムを10数秒から
数分の範囲、いわゆる緩結型に調整したとき、従来の重
炭酸塩を硬化剤成分として用いた薬液では得られなかっ
た性能- 形成される硬化体の強度の発現が良好であり、
かつ、離漿現象が少なく硬化体からの離漿水の生成量が
少ない、という性能が同時に得られ、より安全・確実に
地盤を安定化できる。[Effects of the Invention] With the silicate-based soil stabilizing chemical solution and ground stabilization method of the present invention, when the gel time of the chemical solution is adjusted to a range of 10 to several minutes, that is, a so-called slow-cure type, the conventional bicarbonate is hardened. Performance that could not be obtained with the chemical solution used as the agent component-The strength of the cured product formed is good.
At the same time, the performance that the syneresis phenomenon is small and the syneresis water generated from the cured body is small can be obtained at the same time, and the ground can be stabilized more safely and reliably.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平５−320643（ＪＰ，Ａ) 特開 昭59−45386（ＪＰ，Ａ) 特開 平７−166163（ＪＰ，Ａ) 特開 昭53−103611（ＪＰ，Ａ) 特開 昭56−74181（ＪＰ，Ａ) 特開 昭57−21478（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) E02D 3/12 101 C09K 17/02 C09K 17/12 C09K 103:00 ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-5-320643 (JP, A) JP-A-59-45386 (JP, A) JP-A-7-166163 (JP, A) JP-A 53- 103611 (JP, A) JP-A-56-74181 (JP, A) JP-A-57-21478 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) E02D 3/12 101 C09K 17/02 C09K 17/12 C09K 103: 00
Claims (2)
とを組み合わせてなる、ゲルタイムが10数秒から数分の
範囲である緩結型土質安定用薬液であって、前記重炭酸
塩がナトリウム塩とカリウム塩との混合物であり、その
量比が重量比で重炭酸ナトリウム：重炭酸カリウム＝5
6：44〜75：25の範囲であって、かつ、薬液中のSiＯ2
分 100重量部あたり重炭酸塩40〜60重量部の範囲で組み
合わせてなることを特徴とする珪酸塩系土質安定用薬
液。1. A slow-moving soil stabilizing chemical solution having a gel time in the range of 10 seconds to several minutes, which is obtained by combining an alkaline silicate aqueous solution and a bicarbonate aqueous solution, wherein the bicarbonate is a sodium salt. It is a mixture with potassium salt, and its weight ratio is sodium bicarbonate: potassium bicarbonate = 5 by weight ratio.
It is in the range of 6:44 to 75:25 and SiO 2 in the chemical solution is
A silicate-based soil stabilization chemical characterized by being combined in the range of 40 to 60 parts by weight of bicarbonate per 100 parts by weight of min.
し、地盤内で硬化させて地盤を安定化させるにあたり、
前記薬液として請求項１記載の珪酸塩系土質安定用薬液
を用いることを特徴とする地盤安定化工法。2. A method of injecting a silicate-based soil stabilization chemical into the ground and hardening the same to stabilize the ground,
A ground stabilization method, wherein the silicate-based soil stabilizing chemical according to claim 1 is used as the chemical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10459995A JP3429899B2 (en) | 1995-04-06 | 1995-04-06 | Silicate soil stabilization chemicals and ground stabilization method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10459995A JP3429899B2 (en) | 1995-04-06 | 1995-04-06 | Silicate soil stabilization chemicals and ground stabilization method using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08277524A JPH08277524A (en) | 1996-10-22 |
| JP3429899B2 true JP3429899B2 (en) | 2003-07-28 |
Family
ID=14384895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10459995A Expired - Lifetime JP3429899B2 (en) | 1995-04-06 | 1995-04-06 | Silicate soil stabilization chemicals and ground stabilization method using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3429899B2 (en) |
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1995
- 1995-04-06 JP JP10459995A patent/JP3429899B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08277524A (en) | 1996-10-22 |
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