JP2003336066A - Injection material for improving ground - Google Patents
Injection material for improving groundInfo
- Publication number
- JP2003336066A JP2003336066A JP2002149651A JP2002149651A JP2003336066A JP 2003336066 A JP2003336066 A JP 2003336066A JP 2002149651 A JP2002149651 A JP 2002149651A JP 2002149651 A JP2002149651 A JP 2002149651A JP 2003336066 A JP2003336066 A JP 2003336066A
- Authority
- JP
- Japan
- Prior art keywords
- fine powder
- cement
- blast furnace
- furnace slag
- gypsum
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、地盤改良用注入
材、詳しくは凝集物の発生を抑制して、地盤への浸透性
を高めた地盤改良用注入材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement injection material, and more particularly to a ground improvement injection material that suppresses the generation of aggregates and enhances the penetration into the ground.
【０００２】[0002]
【従来技術】例えば、ダム建設では建設地の地盤が悪い
場合が多い。その際には地盤改良用注入材（以下、グラ
ウト材）による止水工事が行われる。従来のグラウト材
としては、普通ポルトランドセメント、高炉セメント、
コロイドセメント、超微粒子セメントなどがある。その
中でも、超微粒子セメント系のグラウト材が、最も浸透
性がよい。しかしながら、この超微粒子セメント系のグ
ラウト材でも充分な止水効果が得られない場合が多かっ
た。2. Description of the Related Art For example, in dam construction, the ground of the construction site is often poor. At that time, water stop work will be carried out using ground improvement injection material (hereinafter referred to as grout material). As conventional grout materials, ordinary Portland cement, blast furnace cement,
Examples include colloidal cement and ultrafine particle cement. Among them, the ultrafine cement-based grout material has the best permeability. However, there are many cases in which a sufficient water-blocking effect cannot be obtained even with this ultrafine particle cement-based grout material.
【０００３】そこで、原因を探究したところ、上記微粒
子を主体としたグラウト材では、製造の過程で超微粒子
が凝集し、粗大粒子を発生させていたことが判明した。
この事実に基づき、本願出願人は、特開平９−３２４１
７７号公報において、超微粒子セメントを主体とした超
微粉末と分散剤とからなる混練物を超音波処理した超微
粒子セメント系グラウト材を製造する方法、所定のｐＨ
値に調整した水とカオリンと分散剤からなる混練物を同
じく超音波処理により粒子を分散させたカオリン系グラ
ウト材を製造する方法、さらには上記製造方法で製造し
た超微粒子セメント系グラウト材とカオリン系グラウト
材とを混合するグラウト材の製造法を開示している。Then, as a result of investigating the cause, it was found that in the grout material mainly composed of the above-mentioned fine particles, the ultra-fine particles were agglomerated during the production process to generate coarse particles.
Based on this fact, the applicant of the present application has filed Japanese Patent Application Laid-Open No. 9-3241.
No. 77, a method for producing an ultrafine particle cement-based grout material obtained by ultrasonically treating a kneaded product composed of ultrafine powder mainly containing ultrafine particle cement and a dispersant, and a predetermined pH.
A method of producing a kaolin-based grout material in which particles are dispersed by ultrasonic treatment of a kneaded product of water, kaolin, and a dispersant adjusted to a value, and further, ultrafine particle cement-based grout material and kaolin produced by the above production method Disclosed is a method for producing a grout material by mixing with a grout material.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記特
開平９−３２４１７７号公報の製造方法のグラウト材に
よれば、いずれも砂・粘土層地盤に対しては良好な浸透
性を示すが、それよりさらに透水係数が小さなれき・粘
土層地盤では目標とする止水効果が得られなかった。そ
こで、発明者は、鋭意研究の結果、地盤改良用注入材の
組成中の高炉スラグ微粉末の含有量と、石膏微粉末を含
むセメント微粉末の含有量とをそれぞれ調整し、各微粉
末の最大粒径を１５μｍ以下、各微粉末のメジアン（中
央値）を２．０〜３．５μｍとすれば、これらの微粉末
の凝集を抑え、高い浸透性を有するグラウト材が得られ
ることを知見し、この発明を完成させた。However, according to the grout material of the manufacturing method of the above-mentioned Japanese Patent Application Laid-Open No. 9-324177, both show good permeability to the sand / clay layer ground. Furthermore, the desired water-stopping effect was not obtained on the gravel / clay layer ground with a low hydraulic conductivity. Therefore, the inventor, as a result of diligent research, the content of the blast furnace slag fine powder in the composition of the ground improvement injection material, and the content of the cement fine powder containing gypsum fine powder, respectively adjusted, It was found that when the maximum particle size is 15 μm or less and the median (median value) of each fine powder is 2.0 to 3.5 μm, the agglomeration of these fine powders is suppressed and a grout material having high permeability can be obtained. Then, this invention was completed.
【０００５】[0005]
【発明の目的】この発明は、凝集物の発生を抑制し、地
盤への浸透性を高めることができる地盤改良用注入材を
提供することを、その目的としている。OBJECTS OF THE INVENTION It is an object of the present invention to provide a ground improvement injecting material which can suppress the generation of aggregates and enhance the penetration into the ground.
【０００６】[0006]
【課題を解決するための手段】請求項１に記載の発明
は、高炉スラグ微粉末と、石膏微粉末を含むセメント微
粉末とを混合して得られる地盤改良用注入材であって、
前記地盤改良用注入材の組成中、高炉スラグ微粉末の含
有量が８６〜９８重量％、セメント微粉末の含有量が２
〜１４重量％、前記セメント微粉末中の石膏微粉末の含
有量が三酸化硫黄換算で１．０〜７．５重量％であり、
これらの高炉スラグ微粉末、セメント微粉末および石膏
微粉末は、それぞれの最大粒径が１５μｍ以下、それぞ
れのメジアンが２．０〜３．５μｍである地盤改良用注
入材である。The invention according to claim 1 is an injection material for ground improvement obtained by mixing blast furnace slag fine powder and cement fine powder containing gypsum fine powder,
In the composition of the ground improvement injection material, the content of blast furnace slag fine powder is 86 to 98% by weight, and the content of cement fine powder is 2
The content of the gypsum fine powder in the cement fine powder is 1.0 to 7.5 wt% in terms of sulfur trioxide,
These blast furnace slag fine powder, cement fine powder and gypsum fine powder are ground improvement injection materials having a maximum particle size of 15 μm or less and a median of 2.0 to 3.5 μm.
【０００７】この発明に使用する高炉スラグ微粉末は、
例えば刺激材の存在により水硬性を有する急冷高炉スラ
グ微粉末である。これは、溶鉱炉より排出される高温の
スラグ（高炉滓）を急冷したものであり、アルカリ性物
質などの刺激材により硬化する性質を有している。この
高炉スラグを粉砕装置と分級装置とにより粉砕・分級す
ることで、最大粒径１５μｍ以下の高炉スラグ微粉末が
製造される。使用する粉砕装置としては、例えばボール
ミル、ローラミル、インパクトミルなどが挙げられる。
高炉スラグ微粉末の最大粒径が１５μｍを超えると、例
えばれき・粘土層地盤などの透水係数が小さい地盤に対
しての浸透性が低下する。この最大粒径は１５μｍ以下
が好ましく、さらに好ましくは１２μｍ以下である。粒
度は、シーラス（株）製レーザ粒度分析装置ＨＲ８５０
型により測定した値である。The blast furnace slag fine powder used in the present invention is
For example, it is a quenched blast furnace slag fine powder having hydraulic properties due to the presence of a stimulant. This is a high temperature slag (blast furnace slag) discharged from a blast furnace, which is rapidly cooled and has a property of being hardened by a stimulant such as an alkaline substance. By crushing and classifying this blast furnace slag with a crushing device and a classifying device, blast furnace slag fine powder having a maximum particle size of 15 μm or less is manufactured. Examples of the crushing device used include a ball mill, a roller mill and an impact mill.
If the maximum particle size of the blast furnace slag fine powder exceeds 15 μm, the permeability to the ground having a low hydraulic conductivity, such as the gravel / clay layer ground, decreases. The maximum particle size is preferably 15 μm or less, more preferably 12 μm or less. The particle size is a laser particle size analyzer HR850 manufactured by Cirrus Co., Ltd.
It is the value measured by the mold.
【０００８】高炉スラグ微粉末のメジアンは２．０〜
３．５μｍ、好ましくは２．０〜３．０μｍである。
２．０μｍ未満では粒子が細かすぎて凝集を起こしやす
い。また、３．５μｍを超えると粒子が粗大になり、地
盤に対しての浸透性が低下する。地盤改良用注入材を１
００重量％としたときの高炉スラグ微粉末の含有量は８
６〜９８重量％、好ましくは９０〜９８重量％である。
８６重量％未満ではセメントが多すぎて凝集しやすい。
また、９８重量％を超えるとセメントが少なすぎて均一
に混ざりにくい。さらに強度の発現性も低下する。The median of blast furnace slag fine powder is 2.0 to
It is 3.5 μm, preferably 2.0 to 3.0 μm.
If it is less than 2.0 μm, the particles are too fine and aggregation is likely to occur. Further, if it exceeds 3.5 μm, the particles become coarse, and the permeability to the ground decreases. 1 injection material for ground improvement
The content of blast furnace slag fine powder is 8 when the weight is set to 00% by weight.
It is 6 to 98% by weight, preferably 90 to 98% by weight.
If it is less than 86% by weight, the amount of cement is too much and the aggregate tends to aggregate.
Further, if it exceeds 98% by weight, the amount of cement is too small and it is difficult to mix it uniformly. Further, the developability of strength is also reduced.
【０００９】この発明に使用するセメント微粉末として
は、例えば普通ポルトランドセメント、早強ポルトラン
ドセメント、超早強ポルトランドセメント、中庸熱ポル
トランドセメント、耐硫酸塩ポルトランドセメントのほ
か、そのクリンカーや高炉セメントなどの混合セメント
などが挙げられる。使用するセメント微粉末は、ポルト
ランドセメントを分級し、石膏量を調整したもので、Ｓ
Ｏ3値はＪＩＳ規格から外れる。セメント微粉末の好ま
しい含有量は２〜９重量％である。２重量％未満では初
期の強度発現性が著しく低下する。また、１４重量％を
超えるとセメント微粉末が凝集して地盤への浸透性が低
下する。石膏微粉末を含むセメント微粉末の最大粒径は
１５μｍ以下で、好ましくは１２μｍ以下である。セメ
ント微粉末の最大粒径が１５μｍを超えると、例えばれ
き・粘土層地盤などの透水係数が小さい地盤に対して浸
透性が低下する。セメント微粉末のメジアンは２．０〜
３．５μｍ、好ましくは２．０〜３．０μｍである。
２．０μｍ未満では粒子が細かすぎて再凝集しやすく、
かさ密度も増えるので輸送コストが高騰する。また、
３．５μｍを超えると、粒子の粗大化により地盤への浸
透性が低下する。The fine cement powder used in the present invention includes, for example, ordinary Portland cement, early-strength Portland cement, super-early-strength Portland cement, moderate heat Portland cement, sulfate-resistant Portland cement, its clinker and blast furnace cement. Examples include mixed cement. The cement fine powder used is one obtained by classifying Portland cement and adjusting the amount of gypsum.
The O 3 value deviates from the JIS standard. The preferred content of cement fine powder is 2 to 9% by weight. If it is less than 2% by weight, the initial strength development property is significantly reduced. On the other hand, if it exceeds 14% by weight, the cement fine powder agglomerates to lower the permeability to the ground. The maximum particle size of cement fine powder including gypsum fine powder is 15 μm or less, preferably 12 μm or less. If the maximum particle size of the cement fine powder exceeds 15 μm, the permeability of the ground having a low hydraulic conductivity, such as the gravel and clay layer ground, decreases. The median of cement fine powder is 2.0-
It is 3.5 μm, preferably 2.0 to 3.0 μm.
If it is less than 2.0 μm, the particles are too fine to easily re-aggregate,
Since the bulk density also increases, the transportation cost rises. Also,
When it exceeds 3.5 μm, the permeability of the ground is lowered due to the coarsening of the particles.
【００１０】この発明に使用するセメント微粉末中の石
膏微粉末としては、例えば二水石膏、半水石膏、無水石
膏を採用することができる。石膏微粉末の好ましい含有
量は、セメント微粉末に対して三酸化硫黄（ＳＯ3）換
算で１．０〜７．５重量％、好ましくは２〜７重量％で
ある。１．０重量％未満では強度の発現性が悪く、収縮
も大きくなる。また、７．５重量％を超えるとエトリン
ガイトを多く生成しすぎるので、将来的な耐久性が弱く
なるおそれがある。石膏微粉末のメジアンは２．０〜
３．５μｍ、好ましくは２．０〜３．０μｍである。
２．０μｍ未満では再凝集しやすい。また、３．５μｍ
を超えると粒子の粗大化により地盤への浸透性が低下す
る。As the gypsum fine powder in the cement fine powder used in the present invention, for example, gypsum dihydrate, gypsum hemihydrate, and anhydrous gypsum can be adopted. The preferable content of the gypsum fine powder is 1.0 to 7.5% by weight, preferably 2 to 7% by weight, in terms of sulfur trioxide (SO 3 ) based on the cement fine powder. If it is less than 1.0% by weight, the strength is poorly expressed and the shrinkage is increased. On the other hand, if it exceeds 7.5% by weight, too much ettringite is produced, which may reduce the durability in the future. The median of gypsum fine powder is 2.0-
It is 3.5 μm, preferably 2.0 to 3.0 μm.
If it is less than 2.0 μm, re-aggregation tends to occur. Also, 3.5 μm
If it exceeds, the permeability of the ground will be reduced due to the coarsening of the particles.
【００１１】これらの高炉スラグ微粉末、セメント微粉
末および石膏微粉末の混練時には、分散剤を添加しても
よい。分散剤の種類は限定されない。例えば、市販され
ているリグニン系スルホン酸塩、多環アロマ系スルホン
酸塩、メラミン系スルホン酸塩、ポリオキシエチレンエ
ーテルなどの高性能分散剤を採用することができる。添
加量は、例えば液状の分散剤である花王株式会社製の商
品名マイテイ１５０（ナフタレンスルホン酸塩）の場
合、上記高炉スラグ微粉末およびセメント微粉末に対し
て０．５〜４％である。ただし、この数値は、市販され
ている分散剤の種類によっても変化する。そのため、使
用する分散剤に応じて決定される。また、マイティ１０
０（マイティ１５０の粉末タイプ）のような微粉末タイ
プの分散剤を使用すれば、高炉スラグ微粉末とセメント
微粉末の混合物にあらかじめプレミックスすることがで
き、しかもその添加量は液状のマイティ１５０の場合の
約半分となる。また、高炉スラグ微粉末、石膏微粉末を
含むセメント微粉末は、それぞれ個別に粉砕（分離粉
砕）してもよい。さらに、混練物中の粒子を超音波処理
してより細かく分散させてもよい。すなわち、例えば分
散剤だけでは完全に分散できない場合には、超音波処理
を施し、混練物中の粒子を再分散させ、グラウト材の性
能を向上させてもよい。グラウト材では、水／粉体比が
その性能に大きく影響をおよぼす。例えば、この水／粉
体比は２〜２０、好ましくは３〜１６とすることができ
る。When kneading these blast furnace slag fine powder, cement fine powder and gypsum fine powder, a dispersant may be added. The type of dispersant is not limited. For example, commercially available high-performance dispersants such as lignin-based sulfonates, polycyclic aroma-based sulfonates, melamine-based sulfonates, and polyoxyethylene ethers can be used. For example, in the case of Mighty 150 (naphthalene sulfonate) manufactured by Kao Corporation, which is a liquid dispersant, the addition amount is 0.5 to 4% with respect to the blast furnace slag fine powder and the cement fine powder. However, this numerical value also changes depending on the type of dispersant that is commercially available. Therefore, it is determined according to the dispersant used. Also, Mighty 10
If a fine powder type dispersant such as 0 (powder type of Mighty 150) is used, it can be premixed with a mixture of blast furnace slag fine powder and cement fine powder in advance, and the addition amount thereof is liquid Mighty 150. It will be about half that of. The cement fine powder containing the blast furnace slag fine powder and the gypsum fine powder may be individually pulverized (separated and pulverized). Further, the particles in the kneaded product may be subjected to ultrasonic treatment to be finely dispersed. That is, for example, when the dispersant alone cannot completely disperse the particles, ultrasonic treatment may be performed to redisperse the particles in the kneaded product to improve the performance of the grout material. In grout materials, the water / powder ratio has a large effect on its performance. For example, this water / powder ratio can be 2 to 20, preferably 3 to 16.
【００１２】請求項２に記載の発明は、前記高炉スラグ
微粉末、前記石膏微粉末を含むセメント微粉末が、それ
ぞれ分離粉砕されている請求項１に記載の地盤改良用注
入材である。これらの高炉スラグ微粉末、石膏微粉末を
含むセメント微粉末はそれぞれ個別に粉砕され、その
後、混合される。The invention according to claim 2 is the injection material for ground improvement according to claim 1, wherein the blast furnace slag fine powder and the cement fine powder containing the gypsum fine powder are separated and pulverized respectively. These blast furnace slag fine powder and cement fine powder containing gypsum fine powder are individually pulverized and then mixed.
【００１３】[0013]
【発明の実施の態様】以下、この発明の実施例を詳細に
説明する。ただし、この実施例に限定されるものではな
い。図１は、この発明の一実施例に係る地盤改良用注入
材の浸透試験の結果を示すグラフである。図２は、この
発明の一実施例に係る経過時間と曲げ強度との関係を示
すグラフである（ＪＩＳモルタル）。図３は、この発明
の一実施例に係る経過時間と圧縮強度を示すグラフであ
る（ＪＩＳモルタル）。工場に入荷した高炉水砕スラ
グ、市販の早強ポルトランドセメントを粉砕装置により
それぞれ分離粉砕し、その後、分級機によってそれぞれ
分級することで、表１に示す水準の高炉スラグ微粉末、
石膏微粉末を含んだセメント微粉末を製造する。これら
の微粉末の粒度分布は、シーラス（株）製レーザ粒度分
析装置ＨＲ８５０型を用い、溶媒をエタノールとして測
定した。また、浸透性の試験は、内径５０ｍｍ×高さ５
００ｍｍのモールド管に豊浦標準砂５００ｇを詰め、上
から水／粉体比３のセメントミルクを浸透させてモール
ド管を通過する時間を測定した。なお、５分経過しても
セメントミルクが通過しない場合には浸透せずと見な
し、その時点で試験を終了する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. However, it is not limited to this embodiment. FIG. 1 is a graph showing the results of a penetration test of a ground improvement casting material according to an embodiment of the present invention. FIG. 2 is a graph showing the relationship between elapsed time and bending strength according to an example of the present invention (JIS mortar). FIG. 3 is a graph showing elapsed time and compressive strength according to one embodiment of the present invention (JIS mortar). Granulated blast furnace slag that arrived at the factory and commercially available early-strength Portland cement were separated and pulverized by a pulverizer, respectively, and then classified by a classifier.
A cement fine powder containing gypsum fine powder is produced. The particle size distribution of these fine powders was measured by using a laser particle size analyzer HR850 type manufactured by Cirrus Co., Ltd. with ethanol as a solvent. In addition, the permeability test is performed with an inner diameter of 50 mm and a height of 5
A 00 mm mold tube was filled with 500 g of Toyoura standard sand, and cement milk having a water / powder ratio of 3 was permeated from above to measure the time for passing through the mold tube. If the cement milk does not pass after 5 minutes, it is considered that it has not penetrated, and the test is terminated at that point.
【００１４】[0014]
【表１】 [Table 1]
【００１５】一実施例に使用するグラウト材は、ハンド
ミキサー（マキタ製カクハン器ＵＴ１３０１型）に水と
分散剤（花王株式会社製のマイティ１５０）をグラウト
材に対して２％だけ投入してから１０秒間だけ攪拌し、
引き続き攪拌（混合）しながら所定量の高炉スラグ微粉
末と、石膏微粉末を含むセメント微粉末を振とう混合さ
せたものを供給した後、さらに２分間混合して混練物
（ペースト）を作成する。このように、地盤改良用注入
材の組成中、高炉スラグ微粉末の含有量を８６〜９８重
量％、セメント微粉末の含有量を２〜１４重量％、石膏
微粉末の含有量を三酸化硫黄換算で１．０〜７．５重量
％とし、さらに高炉スラグ微粉末、石膏微粉末を含むセ
メント微粉末は、それぞれの最大粒径が１５μｍ以下、
それぞれのメジアンが２．０〜３．５μｍとしたので、
凝集物の発生を抑制し、地盤への浸透性を高めることが
できる。比較例６は、三酸化硫黄が１．０重量％未満で
ありながら浸透性は良好である。ただし、凝結が短くて
収縮が大きくなる。また、比較例７は、三酸化硫黄が
７．５重量％を超過するものの浸透性は良好である。し
かしながら、凝結が長くなり、強度発現性が劣る。しか
も、エトリンガイト（針状結晶）が多すぎて、耐久性に
問題がある。The grout material used in one example was prepared by adding water and a dispersant (Mighty 150 manufactured by Kao Co., Ltd.) to a hand mixer (Kakuhan UT1301 manufactured by Makita Co., Ltd.) in an amount of 2% based on the grout material. Stir for 10 seconds,
After continuously stirring (mixing), a predetermined amount of blast furnace slag fine powder and cement fine powder containing gypsum fine powder were mixed by shaking, and then the mixture was further mixed for 2 minutes to prepare a kneaded product (paste). . Thus, in the composition of the ground improvement injection material, the content of blast furnace slag fine powder is 86 to 98% by weight, the content of cement fine powder is 2 to 14% by weight, and the content of gypsum fine powder is sulfur trioxide. The maximum particle size of each of the cement fine powders containing the blast furnace slag fine powder and the gypsum fine powder is 15 μm or less.
Since each median was 2.0 to 3.5 μm,
It is possible to suppress the generation of aggregates and enhance the permeability to the ground. Comparative Example 6 has good permeability even though sulfur trioxide is less than 1.0% by weight. However, the condensation is short and the shrinkage is large. Further, in Comparative Example 7, although the sulfur trioxide exceeds 7.5% by weight, the permeability is good. However, the setting is long and the strength development is poor. Moreover, there are too many ettringites (needle-shaped crystals), which causes a problem in durability.
【００１６】次に、試験例２のグラウト材を使用し、グ
ラウト材中の早強ポルトランドセメント微粉末（ＨＰ
Ｈ）の添加量と浸透性との関係を調べる試験を行った。
その結果を、図１のグラフに示す。図中、注入材は高炉
スラグ微粉末（ＭＭＨ）と早強ポルトランドセメント微
粉末で構成され、図中のパーセントは早強ポルトランド
セメント微粉末の内割添加量である。図１から明らかな
ように、早強ポルトランドセメント微粉末２％のものが
最も浸透性が良好であった。次に、グラウト材の添加量
のちがいによるＪＩＳモルタル強さ試験の結果を、図２
および図３に示す。図３に示すように、早強ポルトラン
ドセメント微粉末を内割で２％添加したものが、低熱ポ
ルトランドセメントの材齢２８日圧縮強度のＪＩＳ規格
（ＪＩＳＲ ５２０１）における最小値の２２．５Ｎ／
ｍｍ2 であった。ＪＩＳ Ｒ ５２０１において、各試
料につき、水／粉体比０．５、砂／粉体比３のモルタル
供試体を作成し、材齢３日と７日と２８日の強さ試験を
行うものである。また、図２に示すように、材齢２８日
の曲げ強度も内割で２％添加したものが最小値の４．６
Ｎ／ｍｍ2 であった。早強ポルトランドセメント微粉末
が内割で１％の場合には、この早強ポルトランドセメン
ト微粉末を高炉スラグ微粉末中に均一に混合するのがむ
ずかしい。しかも、この１％では、圧縮強度が低熱ポル
トランドセメントの下限値まで達しない。以上の結果か
ら、２％の早強ポルトランドセメント微粉末を含有した
ものが、ＪＩＳ規格の強度の基準値を満たした中で、最
も浸透性が良いものであった。Next, using the grout material of Test Example 2, the early-strength Portland cement fine powder (HP) in the grout material was used.
A test was conducted to examine the relationship between the amount of H) added and the permeability.
The results are shown in the graph of FIG. In the figure, the injection material is composed of blast furnace slag fine powder (MMH) and early-strength Portland cement fine powder, and the percentage in the figure is the proportion of the early-strength Portland cement fine powder added. As is clear from FIG. 1, the one having 2% of early strength Portland cement fine powder had the best permeability. Next, the results of the JIS mortar strength test depending on the difference in the amount of the grout material added are shown in FIG.
And shown in FIG. As shown in FIG. 3, the addition of 2% of early-strength Portland cement fine powder was 22.5 N / the minimum value in JIS standard (JISR 5201) of 28-day compressive strength of low heat Portland cement.
It was mm 2 . According to JIS R5201, a mortar specimen with a water / powder ratio of 0.5 and a sand / powder ratio of 3 is prepared for each sample, and a strength test is conducted for 3 days, 7 days, and 28 days. is there. In addition, as shown in FIG. 2, the bending strength of 28 days old, which is 2% as a percentage, is the minimum value of 4.6.
It was N / mm 2 . When the early-strength Portland cement fine powder is 1%, it is difficult to uniformly mix the early-strength Portland cement fine powder with the blast furnace slag fine powder. Moreover, at this 1%, the compressive strength does not reach the lower limit of the low heat Portland cement. From the above results, the one containing 2% of early-strength Portland cement fine powder had the best permeability among the strength standards of JIS standard.
【００１７】[0017]
【発明の効果】本発明の地盤改良用注入材は、凝集物の
発生を抑制し、地盤への浸透性を高めることができる。
これにより、従来では注入が困難とされたれき・粘土層
地盤にも注入することができる。その結果、例えば従来
まではダム建設が不可能とされた地点でも、ダムの建設
が可能になる。INDUSTRIAL APPLICABILITY The ground improvement casting material of the present invention can suppress the generation of aggregates and enhance the permeability to the ground.
As a result, it is possible to inject into the gravel / clay layer ground, which was conventionally difficult to inject. As a result, for example, it is possible to construct a dam even at a place where the dam could not be constructed until now.
【図１】この発明の一実施例に係る地盤改良用注入材の
浸透試験の結果を示すグラフである。FIG. 1 is a graph showing the results of a penetration test of a ground improvement casting material according to an embodiment of the present invention.
【図２】この発明の一実施例に係る経過時間と曲げ強度
との関係を示すグラフである。FIG. 2 is a graph showing the relationship between elapsed time and bending strength according to an example of the present invention.
【図３】この発明の一実施例に係る経過時間と圧縮強度
を示すグラフである。FIG. 3 is a graph showing elapsed time and compressive strength according to an example of the present invention.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） // Ｃ０９Ｋ 103:00 Ｃ０９Ｋ 103:00 (72)発明者 小松 茂 福岡県北九州市八幡西区洞南町１−１ 株 式会社宇部三菱セメント研究所黒崎センタ ー内 (72)発明者 小幡 浩司 福岡県北九州市八幡西区洞南町１−１ 株 式会社宇部三菱セメント研究所黒崎センタ ー内 (72)発明者 西田 光彦 福岡県北九州市八幡西区洞南町１−１ 株 式会社宇部三菱セメント研究所黒崎センタ ー内 Ｆターム(参考） 2D040 AB01 CA01 CA03 CA04 4H026 CA01 CA04 CA05 CC04 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) // C09K 103: 00 C09K 103: 00 (72) Inventor Shigeru Komatsu 1-Donan-cho, Hachimansai-ku, Kitakyushu, Fukuoka 1 Incorporated company Ube Mitsubishi Cement Research Laboratories Kurosaki Center (72) Inventor Koji Obata 1-1 Konami-cho, Hachiman Nishi-ku, Kitakyushu City, Fukuoka Prefecture Incorporated Ube Mitsubishi Cement Research Laboratories Kurosaki Center (72) Inventor Mitsuhiko Nishida 1-1, Konan-cho, Hachimansai-ku, Kitakyushu City, Fukuoka Prefecture F-term in Kurosaki Center, Ube Mitsubishi Cement Research Institute (Reference) 2D040 AB01 CA01 CA03 CA04 4H026 CA01 CA04 CA05 CC04
Claims (2)
セメント微粉末とを混合して得られる地盤改良用注入材
であって、 前記地盤改良用注入材の組成中、高炉スラグ微粉末の含
有量が８６〜９８重量％、セメント微粉末の含有量が２
〜１４重量％、前記セメント微粉末中の石膏微粉末の含
有量が三酸化硫黄換算で１．０〜７．５重量％であり、 これらの高炉スラグ微粉末、セメント微粉末および石膏
微粉末は、それぞれの最大粒径が１５μｍ以下、それぞ
れのメジアンが２．０〜３．５μｍである地盤改良用注
入材。1. A ground improvement injection material obtained by mixing blast furnace slag fine powder and cement fine powder containing gypsum fine powder, wherein the blast furnace slag fine powder is contained in the composition of the ground improvement injection material. The content is 86-98% by weight, the content of cement fine powder is 2
The content of gypsum fine powder in the cement fine powder is 1.0 to 7.5 wt% in terms of sulfur trioxide, and these blast furnace slag fine powder, cement fine powder and gypsum fine powder are , The maximum particle diameter of each is 15 μm or less, and the median of each is 2.0 to 3.5 μm.
を含むセメント微粉末が、それぞれ分離粉砕されている
請求項１に記載の地盤改良用注入材。2. The ground improvement injection material according to claim 1, wherein the blast furnace slag fine powder and the cement fine powder containing the gypsum fine powder are separated and pulverized, respectively.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008138056A (en) * | 2006-11-30 | 2008-06-19 | Taiheiyo Material Kk | Water stop material |
| JP2019119647A (en) * | 2018-01-05 | 2019-07-22 | 株式会社デイ・シイ | Hydraulic composition |
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|---|---|---|---|---|
| JP5861830B2 (en) * | 2012-03-09 | 2016-02-16 | 三菱マテリアル株式会社 | Method for preventing radioactive material from being scattered on the surface of soil |
| JP6305872B2 (en) * | 2013-08-25 | 2018-04-04 | 株式会社 エコ・ライズ | Radiation dose reduction method for radiation contaminated soil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008138056A (en) * | 2006-11-30 | 2008-06-19 | Taiheiyo Material Kk | Water stop material |
| JP2019119647A (en) * | 2018-01-05 | 2019-07-22 | 株式会社デイ・シイ | Hydraulic composition |
| JP7090978B2 (en) | 2018-01-05 | 2022-06-27 | 株式会社デイ・シイ | Hydraulic composition |
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