JPH07116438B2 - Grout - Google Patents
GroutInfo
- Publication number
- JPH07116438B2 JPH07116438B2 JP1144577A JP14457789A JPH07116438B2 JP H07116438 B2 JPH07116438 B2 JP H07116438B2 JP 1144577 A JP1144577 A JP 1144577A JP 14457789 A JP14457789 A JP 14457789A JP H07116438 B2 JPH07116438 B2 JP H07116438B2
- Authority
- JP
- Japan
- Prior art keywords
- water glass
- cement
- molar ratio
- lime
- strength
- 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 - Fee Related
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はセメント−水ガラス系グラウトの改良に係り、
詳細には、数時間の凝固時間を持続して長時間後に地盤
中で確実に固結せしめ、かつ長期固結強度に優れたセメ
ント−水ガラス系グラウト材に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to improvement of a cement-water glass-based grout,
More specifically, the present invention relates to a cement-water glass-based grout material which can be solidified in the ground after a long time of solidification for several hours and which is excellent in long-term solidification strength.
セメント−水ガラス系グラウトとして従来、高モル比水
ガラス（モル比３前後の３号ガラス）を用い、凝固時間
が１〜数分のグラウトがLW工法として実用化されてい
る。このグラウトは凝固時間を数秒に短縮し、かつ長期
固結強度を増強するために、消石灰または生石灰の添加
がはかられている。Conventionally, a high molar ratio water glass (No. 3 glass with a molar ratio of about 3) is used as a cement-water glass grout, and a grout having a solidification time of 1 to several minutes has been put to practical use as an LW method. This grout is added with slaked lime or quick lime in order to shorten the solidification time to several seconds and enhance the long-term consolidation strength.
また、このグラウトは凝固時間を延長せしめるために
は、水ガラスやセメントの濃度を低下させるが、強度の
劣化が激しい。その改良法としてモル比1.4〜2.5、濃度
（SiO2＋Na2O重量％）33〜45％の水ガラスとセメント懸
濁液を合流混合して数分程度を要して凝固せしめる工法
が考案されている。Further, this grout lowers the concentration of water glass and cement in order to prolong the solidification time, but the strength is severely deteriorated. As an improved method, a method was devised in which a water glass with a molar ratio of 1.4 to 2.5 and a concentration (SiO 2 + Na 2 O weight%) of 33 to 45% was mixed and mixed to solidify in a few minutes. ing.
また、水ガラス−セメント系グラウトにおいて、低モル
比水ガラス水溶液とセメント懸濁液の未固結流動性ゲル
を粘性土に混合、またはこのグラウトに水酸化アルミニ
ウム膠状沈殿物等を添加して砂地地盤に混合する考案が
なされている。しかしこの工法は水ガラスの同一濃度に
対してモル比が低下するに従って強度劣化をきたしてい
る。Further, in the water glass-cement-based grout, a low molar ratio water glass aqueous solution and an unconsolidated fluid gel of a cement suspension are mixed with cohesive soil, or an aluminum hydroxide glue precipitate or the like is added to this grout. It has been devised to mix it with sandy ground. However, this method causes strength deterioration as the molar ratio decreases with respect to the same concentration of water glass.
水ガラスと硫酸を主とした酸性剤との強制混合によって
得た酸性シリカゾルとセメント懸濁液からなる系に溶解
性アルカリ剤を加えて凝固時間を数10秒から数分程度に
調整する工法も考案されている。There is also a method of adjusting the coagulation time to several tens of seconds to several minutes by adding a soluble alkaline agent to a system consisting of acidic silica sol and cement suspension obtained by forced mixing of water glass and an acidic agent mainly containing sulfuric acid. Invented.
この工法においても凝固時間を数時間持続せしめること
は不可能で、かつ好ましからざる硫酸イオン流出の懸念
を生ずる。Even with this method, it is impossible to maintain the coagulation time for several hours, and there is a fear of undesired outflow of sulfate ions.
凝固時間を数時間まで長びかせて均等混合による１ショ
ット注入を可能にし、しかもそれ自体で長期固結強度と
恒久性に優れた水ガラス−セメント系グラウトは現在の
ところ未だに開発されていない。A water glass-cement-based grout which has a long setting time up to several hours and enables one shot injection by uniform mixing, and which itself has excellent long-term consolidation strength and durability, has not yet been developed.
そこで、本発明の目的は数時間の凝固時間を持続し、し
かも均一な固結体と強固な固結強度を示す水ガラス−セ
メント系グラウト材を提供するものである。Therefore, an object of the present invention is to provide a water glass-cement-based grout material which continues a coagulation time of several hours and shows a uniform solidified body and a strong solidified strength.
前述の目的を達成するため、本発明によれば、モル比1.
0〜約2.0の水ガラスと、セメントと、石灰とを有効成分
としてなることを特徴とする。According to the invention, the molar ratio of 1.
It is characterized by comprising 0 to about 2.0 water glass, cement, and lime as active ingredients.
前述の石灰とは消石灰および／または生石灰であり、こ
の配合量は消石灰換算で２〜10重量部／容量％（生石灰
として1.5〜８重量／容量％）である。また、セメント
の配合量は15〜40重量部／容量％である。The above-mentioned lime is slaked lime and / or quick lime, and the blending amount thereof is 2 to 10 parts by weight / volume% in terms of slaked lime (1.5 to 8 weight / volume% as quick lime). The cement content is 15 to 40 parts by weight / volume%.
水ガラス−セメント系グラウトにおいて、使用する水ガ
ラスのモル比を低下せしめると、モル比が２近辺以下で
急に凝固することなく流動性の状態を長時間持続し、こ
の混合液をそのまま放置しておくと離漿現象を起こして
上澄液を生じて沈殿し、その沈殿物は強度的にも軟弱で
ある。In the water glass-cement-based grout, when the molar ratio of the water glass used is lowered, the liquid state is maintained for a long time without sudden solidification at a molar ratio of about 2 or less, and this mixed solution is left as it is. If left undisturbed, a syneresis phenomenon will occur and a supernatant liquid will be produced and it will precipitate, and the precipitate is also weak in strength.
このような混合物は明白なゲル化時点がみられず、注入
範囲外へ逸脱してしまい、また強度並びに水密性も不充
分で注入材としては不適当である。Such a mixture is not suitable as an injection material because no obvious gelation point is observed, it deviates from the injection range, and the strength and watertightness are insufficient.
本発明は約2.0以下の低いモル比の水ガラスにセメント
および消石灰又は生石灰を加えると、一変して揺変現象
を呈し、粘性を増すが、凝固に至らず流動性の状態を数
時間持続したのちに流動性を失ってゲル化し、しかも石
灰無添加の場合に比べて固結体の離漿水はほとんどな
く、均一な状態の固結体を得ることができ、水中養生に
より著しく強度の増加がみられた。The present invention, when cement and slaked lime or quick lime are added to water glass having a low molar ratio of about 2.0 or less, it undergoes a thixotropic phenomenon by changing completely and the viscosity is increased, but the liquid state is maintained for several hours without solidification. After that, it loses fluidity and gels, and there is almost no syneresis water of the solidified body as compared with the case where lime is not added, a solidified body in a uniform state can be obtained, and the strength is remarkably increased by underwater curing. Was seen.
従って約2.0以下の低モル比の水ガラス水溶液−セメン
ト−石灰系からなるグラウト材は、従来のセメント−水
ガラス系グラウト材では不可能な１ショット注入を可能
にし、しかも長期固結強度の増強と優れた恒久性が期待
できる。特に水ガラスとしてモル比が1.0〜約2.0、石灰
２〜10重量部／容量％（消石灰換算）およびセメント15
〜40重量部／容量％の範囲にあるものは数時間後には確
実にゲル化し強度的にも優れている。Therefore, a grout material composed of a water glass aqueous solution having a low molar ratio of about 2.0 or less-cement-lime system enables one shot injection, which is impossible with the conventional cement-water glass-based grout material, and enhances long-term consolidation strength. And excellent durability can be expected. Especially as water glass, the molar ratio is 1.0 to about 2.0, lime 2 to 10 parts by weight / volume% (calculated as slaked lime) and cement 15
Those in the range of up to 40 parts by weight / volume% will surely gel after several hours and have excellent strength.
以下実施例により具体的に詳述する。 Specific examples will be described in detail below.
実施例 1.使用水ガラス モル比の異なる表−１に示す５種類の水ガラスを使用す
る。Example 1. Water glass used Five kinds of water glass shown in Table 1 having different molar ratios are used.
2.水ガラス−セメント系グラウト 表−１の各種モル比の水ガラス水溶液をＡ液とし、Ｂ液
としてセメントの水懸濁液を用い、Ａ液とＢ液の混合に
よる結果を表−２に示す表−２から次のことがわかる。 2. Water glass-cement-based grout Table-2 shows the results obtained by mixing the solutions A and B with water glass aqueous solutions having various molar ratios shown in Table 1 as solution A, and an aqueous suspension of cement as solution B. The following can be seen from Table 2 shown.
（１）使用水ガラスのモル比が3.1から1.97と低下する
に従って凝固時間は長くなり、強度は低下していく。 (1) As the molar ratio of the water glass used decreases from 3.1 to 1.97, the coagulation time increases and the strength decreases.
（２）使用水ガラスのモル比がさらに低下するとゲル化
することなく上澄液を生じて沈殿する。沈殿物の強度は
モル比３付近の水ガラスの場合に比べて著しく弱く、ま
た固結体自体の離漿水も多い。(2) When the molar ratio of the water glass used further decreases, a supernatant is produced and precipitates without gelation. The strength of the precipitate is significantly weaker than that of water glass having a molar ratio of about 3, and the amount of syneresis water of the solidified body itself is large.
3.水ガラス−セメント−消石灰（または生石灰）系グラ
ウト表−１の各種モル比の水ガラス水溶液をＡ液とし、
Ｂ液としてセメント・消石灰（または生石灰）の水懸濁
液を用い、Ａ液とＢ液の混合による結果を表−３に示
す。3. Water glass-cement-slaked lime (or quick lime) -based grout A water glass aqueous solution having various molar ratios shown in Table 1 is used as solution A,
Table 3 shows the results obtained by mixing the liquids A and B using a water suspension of cement / slaked lime (or quick lime) as the liquid B.
表−３から次のことがわかる。 The following can be seen from Table-3.
（１）モル比3.1と2.5の水ガラスを使用の場合は表−２
のそれに相当する系よりも凝固時間は短縮し、強度的に
も優れた固結体を得た。従って短時間凝固としては優れ
たグラウトである。(1) When using water glass with molar ratios of 3.1 and 2.5, see Table-2.
The solidification time was shorter than that of the system corresponding to that, and a solid body excellent in strength was obtained. Therefore, it is an excellent grout for short-time solidification.
（２）モル比1.97の水ガラスを使用の場合、表−２のそ
れに相当する系では３〜５分の凝固時間であったもの
が、一変して揺変現象を呈し、粘性を増すが流動性を数
時間持続しながら明白なゲル化状態となり流動性を失い
凝固に至る。(2) When water glass with a molar ratio of 1.97 is used, the system corresponding to that in Table-2, which had a solidification time of 3 to 5 minutes, changed completely and exhibited a rocking phenomenon, increasing the viscosity but flowing. While maintaining the sex for several hours, it becomes a clear gelled state and loses fluidity and solidifies.
しかも強度は表−２の石灰類無添加の場合より増加、特
に水中養生30日目の増加は著しい。Moreover, the strength is increased as compared with the case of no addition of limes in Table 2, especially the increase on the 30th day in water is remarkable.
（３）モル比1.51、1.04の水ガラスを使用の場合でもモ
ル比1.97の場合と同じ傾向を示す。(3) The same tendency as in the case where the molar ratio is 1.97 is exhibited even when water glass having a molar ratio of 1.51 and 1.04 is used.
モル比1.04となると揺変現象によって粘性の増加が著し
く、半凝固状態に近い状態になるためモル比1.0以上の
水ガラスを併用することが好ましい。When the molar ratio is 1.04, the viscosity increases remarkably due to the thixotropic phenomenon, and it becomes a state close to a semi-solidified state. Therefore, it is preferable to use water glass having a molar ratio of 1.0 or more together.
（４）消石灰または生石灰の使用量は多い程離漿水は少
なく、固結強度も優れ、消石灰は２重量部／容量％以
上、生石灰は1.5重量／容量％以上の添加が望ましい。
しかし、消石灰は10重量／容量％以上、生石灰は８重量
／容量％以上の多量添加は粘性の増加で混合系の初期か
ら流動性に欠けゲル化時が不明瞭となる。(4) The greater the amount of slaked lime or quick lime used, the less syneresis water and the better the caking strength. It is desirable to add slaked lime in an amount of 2 parts by weight / volume% or more, and quick lime in an amount of 1.5 weight / volume% or more.
However, when a large amount of slaked lime is added at 10% by weight or more and quicklime is added at 8% by weight or more, the fluidity is insufficient from the beginning of the mixing system due to an increase in viscosity, and the gelation becomes unclear.
本発明は水ガラス、セメント、石灰類の量を変えること
により、また塩化カルシウムその他の塩類を併用するこ
とによりゲル化時間を調整できるのは勿論である。In the present invention, it is needless to say that the gelation time can be adjusted by changing the amounts of water glass, cement and lime, and by using calcium chloride and other salts together.
セメント−水ガラス（高モル比）の系、またはセメント
−水ガラス（高モル比）−石灰類からなる系では、数分
から数10秒程度の凝固時間で固結せしめるのに適してい
るが数時間の凝固時間で固結し、しかも強固な固結をう
ることは不可能とされていた。本発明は、モル比1.0〜
約2.0の低モル比の水ガラスと、セメントと、消石灰
（または生石灰）であって、セメントが15〜40重量部／
容量％、石灰が２〜10重量部／容量％である系において
起る揺変現象と所定時間後に明白なゲル化が生じて流動
性がなくなることに着目して、数時間の長時間を要して
凝固せしめ、しかも生成した固結体は強度特に長期強度
に極めてすぐれた均一な固結体をうることができる。A cement-water glass (high molar ratio) system or a cement-water glass (high molar ratio) -lime system is suitable for solidification in a solidification time of several minutes to several tens of seconds, but It was considered impossible to obtain solidification by solidifying within a solidification time of time. The present invention has a molar ratio of 1.0 to
Water glass with a low molar ratio of about 2.0, cement, and slaked lime (or quick lime), 15 to 40 parts by weight of cement /
It takes a long time of several hours, paying attention to the thixotropic phenomenon that occurs in a system with a volume% and lime of 2 to 10 parts by weight / volume% and the fact that clear gelation occurs after a predetermined time and the fluidity disappears. The resulting solidified body can be obtained as a uniform solidified body having extremely high strength, particularly long-term strength.
Claims (1)
分としてなるグラウト材において、前記水ガラスはSiO2
／Na2Oのモル比が1.0〜約2.0の低モル比水ガラスであ
り、前記セメント配合量は前記グラウト材100ml当り、1
5〜40gであり、前記石灰配合量は消石灰換算で前記グロ
ウト材100ml当り、２〜10gであるグラウト材。1. A grout material containing water glass, cement and lime as active ingredients, wherein the water glass is SiO 2
/ Na 2 O is a low molar ratio water glass having a molar ratio of 1.0 to about 2.0, and the cement content is 1 per 100 ml of the grout material.
The grout material is 5 to 40 g, and the lime content is 2 to 10 g per 100 ml of the grout material in terms of slaked lime.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1144577A JPH07116438B2 (en) | 1989-06-07 | 1989-06-07 | Grout |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1144577A JPH07116438B2 (en) | 1989-06-07 | 1989-06-07 | Grout |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH039987A JPH039987A (en) | 1991-01-17 |
| JPH07116438B2 true JPH07116438B2 (en) | 1995-12-13 |
Family
ID=15365400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1144577A Expired - Fee Related JPH07116438B2 (en) | 1989-06-07 | 1989-06-07 | Grout |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07116438B2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5914513B2 (en) * | 1978-06-13 | 1984-04-04 | 三洋化成工業株式会社 | Soil stabilization method using chemical solutions |
| JPS57131279A (en) * | 1981-02-06 | 1982-08-14 | Nippon Synthetic Chem Ind Co Ltd:The | Grouting |
| JPS57139174A (en) * | 1981-02-23 | 1982-08-27 | Toagosei Chem Ind Co Ltd | Ground stabilizer |
| JPS60124689A (en) * | 1983-12-09 | 1985-07-03 | Raito Kogyo Kk | Conditioning of ground |
-
1989
- 1989-06-07 JP JP1144577A patent/JPH07116438B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH039987A (en) | 1991-01-17 |
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