JP4217456B2 - Curing material composition - Google Patents
Curing material composition Download PDFInfo
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- JP4217456B2 JP4217456B2 JP2002301510A JP2002301510A JP4217456B2 JP 4217456 B2 JP4217456 B2 JP 4217456B2 JP 2002301510 A JP2002301510 A JP 2002301510A JP 2002301510 A JP2002301510 A JP 2002301510A JP 4217456 B2 JP4217456 B2 JP 4217456B2
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- Prior art keywords
- hardener
- soil
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- 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
Description
【0001】
【発明の属する技術分野】
本発明は、軟弱地盤改良硬化材であって、砂又は砂質土を対象土壌とし、対象土壌と混合することにより地盤を改良する硬化材に関する。
【0002】
【従来の技術】
セメントは硬化する性質があるため、セメント単味あるいはセメントをベース材料とした硬化材が、地盤・土壌・ヘドロ等の硬化材として広く使用されている。この硬化材の土壌などへの添加方法としては、粉体のまま混合する方法、又は硬化材に予め水を加え混練しミルク状に調整したものを混入或いは注入する方法が用いられている。
【0003】
該硬化材には、一般的に目的に応じてセメント以外に他の材料が配合される。高炉スラグ微粉末は潜在水硬性があるためセメントに添加して硬化材の配合材として用いることは既によく知られている。また、石灰石微粉末には潜在水硬性はないが、これを一配合材として用いるセメント系地盤改良材の従来技術としては、裏込めや根固めあるいは止水等を目的とし地盤に注入する、セメントを含む硬化性液に及び炭酸カルシウムなどの増粘剤を添加した硬化性液(例えば特許文献1参照)、セメントクリンカ、石膏、水冷スラグ及び石灰石からなるグラウト材(例えば特許文献2参照)などが挙げられる。
【0004】
一方、土壌と硬化材を混合する方法において、表層地盤改良では、粉体のまま混合する方法がよく行われているが、粉体のままでは混練が困難な場合はミルク状に調整したものを混入する方法が用いられている。深層混合処理工法の場合は、機械攪拌工法、高圧噴射攪拌工法の何れの場合においても、ミルク状に調整したものを混入する方法が広く用いられている。
【0005】
土壌への硬化材混入方法としてミルク状に調整した硬化材を混入する場合は、粉体混入の場合に比べて水量として土中水も含めた水/硬化材比(W/C)は高くなり、コンクリートの場合と同様W/Cの値が高くなるにつれて強度の発現性は小さくなる傾向にある。よってミルク混入の場合、高い強度を得ようとするとミルク混入量を多くしなければならなくなり、従って混入する硬化材の量も多くならざるを得なってくる。混入するミルク量が多くなればそれだけ作業量が増大し、使用固化材量も多くなり不経済となってくる。またミルク量が多くなればスライム即ち排泥量も多くなり排泥の捨て場の確保やその為の余分の経費が必要になる等の問題が生ずる。よって硬化材ミルクを混入して軟弱地盤改良する場合、特に高い改良強度が必要な場合は強度発現性の高い硬化材が必要である。このような高い強度発現性を有する硬化材配合としてはセメント−高炉スラグ−石膏の3成分系のものが知られている(例えば特許文献3、4など参照)。
【0006】
【特許文献1】
特開昭57−100180号公報(請求項1)
【特許文献2】
特開平5−208853号公報(請求項1)
【特許文献3】
特開昭54−113911号公報(請求項1)
【特許文献4】
特開昭60−137496号公報(請求項1)
【0007】
【発明が解決しようとする課題】
しかしながら、この系のものはヘドロや有機質粘性土に対してはセメントやセメント−スラグの2成分系に比較して高い強度を発現するものの、砂や砂質土に対しては、セメントやセメント−高炉スラグ系に比して必ずしも高い強度を発現しないことが本発明者らの実験の結果明らかとなった。
【0008】
従って対象土壌として砂や砂質土の場合の軟弱地盤改良に適した強度の発現性の高い硬化材の開発が課題となっていた。
【0009】
【課題を解決するための手段】
上記課題を解決するため、本発明者らが研究を重ねた結果、セメントをベース材料としこれに特定ブレーン比表面積の高炉スラグ微粉末および特定ブレーン比表面積の石灰石微粉末を、それぞれ特定量配合することにより、砂や砂質土に対してミルク状に調整したものを混入した場合においても高い強度発現性を示す硬化材組成物を見出し、本発明を発明するに至った。
【0010】
すなわち、本発明は、砂又は砂質土である軟弱地盤を対象土壌とする硬化材であって、普通ポルトランドセメント100重量部に対しブレーン比表面積が3000〜8000cm2/gである高炉スラグ微粉末50〜300重量部およびブレーン比表面積が2000〜8000cm2/gである石灰石微粉末5〜50重量部を含有してなる硬化材組成物である。
【0011】
【発明の実施の形態】
本発明において用いられるセメントは普通ポルトランドセメントであれば、特に制限されず、公知の、ブレーン比表面積2000〜6000cm2/gのセメントを用いることができる。
【0012】
本発明に用いられる高炉スラグは通常の高炉水砕スラグありで、ブレーン比表面積が3000〜8000cm2/gのものであり、好ましくは3500〜7000cm2/gである。ブレーン比表面積が3000cm2/g未満のものは強度発現性に劣り、8000cm2/gを超えるものはコスト的に高くなり不経済である。
【0013】
本発明において用いられる高炉スラグの配合量は、上記セメント100重量部に対し50〜300重量部、好ましくは70〜250重量部である必要がある。50重量部未満であっても又は300重量部を超える場合であっても強度の発現性が低下し好ましくない。
【0014】
本発明において用いられる石灰石微粉末はブレーン比表面積が2000〜8000cm2/gのものであり、好ましくは2500〜7000cm2/gである。2000cm2/g未満であると強度発現性が低下し好ましくない。また8000cm2/g超えると強度など物性は向上せず、粉砕コストが高くなり好ましくない。
【0015】
本発明において用いられる石灰石微粉末の配合量は、セメント100重量部に対し5〜50重量部であることが必要である。5重量部未満又は50重量部を超えると強度の発現性が劣り好ましくない。
【0016】
本発明において、硬化材組成物には、本発明の効果を損なわない範囲で、他のセメント混和材などを配合することができる。該混和材としてはたとえば、石膏、硫酸ナトリウムや減水剤等の添加剤等があげられる。また高圧噴射攪拌工法などに用い、ブリージングが起こることが予想される場合は、ブリージングを抑えるために上記硬化材組成物にベントナイトやセルロース系の増粘剤を本発明の効果を損なわない範囲で加えることもできる。例えばベントナイトならば硬化材組成物の1〜20重量%、セルロース系増粘剤ならば1重量%前後添加するのが好ましい。
【0017】
本発明の硬化材組成物の製造方法は特に制限されず、必要に応じて、上記したブレーン比表面積を満足するようにボールミルなどで粉砕した上記した各成分を、公知の方法により混合すれば良い。混合装置としては、例えば、二軸ミキサーや傾胴ミキサーなどが挙げられる。
【0018】
本発明において、該硬化材組成物を用いての軟弱砂質土を改良する施工方法は、従来公知の方法で硬化材をミルク状で混入する方法又は粉体のまま混合する施工法が採用される。ミルクを混入する施工法ではミルクの水比即ちW/C(水/硬化材)は通常60〜150%であり、土1m3に混入するミルクの量は0.1〜1m3である。
【0019】
さらに本発明の硬化材の使用分野は、裏込めや根固めあるいは注入などは含まれず、機械攪拌工法や高圧噴射攪拌工法など土壌との混合を伴う分野である。
【0020】
【発明の効果】
本発明の硬化材組成物を砂又は砂質土である軟弱地盤に対し該組成物を粉体のまま混合し,或いは該組成物に水を加えて混練して硬化材ミルクを調合しこれを軟弱地盤に混入し、該軟弱地盤を高い強度の地盤に改良することが可能である。
【0021】
【実施例】
以下、本発明を更に具体的に説明するために、実施例および比較例を掲げて説明するが、本発明はこれらの実施例に限定されるものものではない。
【0022】
なお、実施例および比較例では、硬化する対象土壌として、土質分類が砂である真砂土を用いた。この真砂土は細粒分(シルトおよび粘土分)9%、含水比14%、湿潤密度1.95g/cm3である。
【0023】
土に硬化材を添加して改良強度を評価する試験は、硬化材ミルクを調整して、対象土に混入し、硬化体供試体を作成し一軸圧縮強度を測定することにより行った。硬化材ミルクはW/C135%で調整し、ミルク:対象土=0.5:1(体積比)で対象土とミルクを混練し、型枠に充填し28日間養生した。硬化体供試体は5cmφ×10cmHであり、JIS A 1216に規定する方法に準じて一軸圧縮強度を測定した。
【0024】
実施例1
高炉水砕スラグをボールミルにて粉砕し、ブレーン比表面積4200cm2/gの高炉スラグ微粉末を得た。また、CaCO3純度95%以上の石灰石をボールミル粉砕しブレーン比表面積3900cm2/gの石灰石微粉末を得た。得られた高炉スラグ微粉末および石灰石微粉末のそれぞれ100重量部および10重量部をブレーン比表面積3350cm2/gの普通ポルトランドセメント(トクヤマ社製)100重量部とヘンシェルミキサーにより混合して硬化材組成物を製造した。表1に配合材のブレーン比表面積及び硬化材の配合重量比を示した。
【0025】
得られた硬化材組成物と水をW/C=135%で3分間スリーワンモーターにて混練し、硬化材ミルクを調合した。さらに得られた硬化材ミルクと真砂土とを体積比0.5:1の割合でソイルミキサー(ホバート社製、MODEL N−50 MIXER)にて3分間混練した後、28日間養生した硬化材混合土の一軸圧縮強度を測定した。その結果を表1に示した。
【0026】
実施例2
石灰石微粉末の配合量を20重量部とした他は実施例1と同様にして硬化材組成物を製造した。
【0027】
得られた硬化材組成物を用い、実施例1と同様に硬化材ミルクを調合して、硬化材混合土の一軸圧縮強度を測定した。その結果を表2に示した。
【0028】
実施例3
高炉スラグ微粉末及び石灰石微粉末の配合量をそれぞれ80重量部および20重量部とした他は実施例1と同様にして硬化材組成物を製造した。
【0029】
得られた硬化材組成物を用い、実施例1と同様に硬化材ミルクを調合して、硬化材混合土の一軸圧縮強度を測定した。その結果を表2に示した。
【0030】
比較例1
高炉スラグ微粉末及び石灰石微粉末を混合せずにトクヤマ社製普通ポルトランドセメント単味で実施例1と同様に硬化材ミルクを調合して、硬化材混合土の一軸圧縮強度を測定した。その結果を表2に示した。
【0031】
比較例2〜4
石灰石微粉末の配合量をそれぞれ0、2、70重量部とした他は実施例1と同様にして硬化材組成物を製造した。
【0032】
得られた硬化材組成物を用い、実施例1と同様に硬化材ミルクを調合して、硬化材混合土の一軸圧縮強度を測定した。その結果を表2に示した。
【0033】
実施例4、比較例5
高炉スラグ微粉末のブレーン比表面積をそれぞれ6100cm2/g、2500cm2/gとした他は実施例2と同様にして硬化材組成物を製造した。
【0034】
得られた硬化材組成物を用い、実施例1と同様に硬化材ミルクを調合して、硬化材混合土の一軸圧縮強度を測定した。その結果を表2に示した。
【0035】
比較例6
石灰石微粉末のブレーン比表面積をそれぞれ1000cm2/gとした他は実施例2と同様にして硬化材組成物を製造した。
【0036】
得られた硬化材組成物を用い、実施例1と同様に硬化材ミルクを調合して、硬化材混合土の一軸圧縮強度を測定した。その結果を表2に示した。
【0037】
実施例5
高炉スラグ微粉末及び石灰石微粉末の配合量をそれぞれ200重量部および25重量部とした他は実施例1と同様にして硬化材組成物を製造した。
【0038】
得られた硬化材組成物を用い、実施例1と同様に硬化材ミルクを調合して、硬化材混合土の一軸圧縮強度を測定した。その結果を表2に示した。
【0039】
比較例7
高炉スラグ微粉末及び石灰石微粉末の配合量をそれぞれ40重量部および15重量部とした他は実施例1と同様にして硬化材組成物を製造した。
【0040】
得られた硬化材組成物を用い、実施例1と同様に硬化材ミルクを調合して、硬化材混合土の一軸圧縮強度を測定した。その結果を表2に示した。
【0041】
比較例8
高炉スラグ微粉末及び石灰石微粉末の配合量をそれぞれ400重量部および25重量部とした他は実施例1と同様にして硬化材組成物を製造した。
【0042】
得られた硬化材組成物を用い、実施例1と同様に硬化材ミルクを調合して、硬化材混合土の一軸圧縮強度を測定した。その結果を表2に示した。
【0043】
比較例9
石灰石微粉末の代わりにブレーン比表面積4150cm2/gの無水石膏を用いた他は実施例2と同様にして硬化材組成物を製造した。
【0044】
得られた硬化材組成物を用い、実施例1と同様に硬化材ミルクを調合して、硬化材混合土の一軸圧縮強度を測定した。その結果を表2に示した。
【0045】
【表1】
【0046】
【表2】
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hard ground-improving hardening material, which is made of sand or sandy soil as a target soil and is mixed with the target soil to improve the ground.
[0002]
[Prior art]
Since cement has the property of hardening, hardened materials based on cement alone or cement as a base material are widely used as hardeners for ground, soil, sludge, and the like. As a method for adding the hardened material to the soil or the like, a method of mixing the powder as it is, or a method of mixing or injecting a hardened material previously mixed with water and kneaded into a milk form is used.
[0003]
In addition to cement, other materials are generally blended with the hardener according to the purpose. Since blast furnace slag fine powder has latent hydraulic properties, it is already well known to add it to cement and use it as a compounding material for a hardener. In addition, limestone fine powder does not have latent hydraulic properties, but as a conventional technology for cement-based ground improvement material using this as a compounding material, cement is injected into the ground for the purpose of backfilling, rooting or water stopping, etc. And a curable liquid obtained by adding a thickener such as calcium carbonate to a curable liquid (see, for example, Patent Document 1), a grout material made of cement clinker, gypsum, water-cooled slag, and limestone (for example, see Patent Document 2). Can be mentioned.
[0004]
On the other hand, in the method of mixing the soil and the hardener, in the surface ground improvement, the method of mixing the powder as it is often done, but if it is difficult to knead the powder as it is, it is adjusted to a milk shape A mixing method is used. In the case of the deep layer mixing method, a method of mixing a milk-like one is widely used in both the mechanical stirring method and the high-pressure jet stirring method.
[0005]
When mixing hardened material adjusted to milk as a method of mixing hardened material into the soil, the water / hardened material ratio (W / C) including soil water is higher than the amount of powder mixed. As in the case of concrete, the strength development tends to decrease as the W / C value increases. Therefore, in the case of milk mixing, in order to obtain high strength, the milk mixing amount must be increased, and therefore the amount of the hardened material to be mixed must be increased. If the amount of milk mixed in increases, the amount of work increases accordingly, the amount of solidifying material used increases, and it becomes uneconomical. Further, when the amount of milk increases, the amount of slime, ie, the amount of mud, increases, and problems such as securing a waste disposal site and the need for extra costs for that purpose arise. Therefore, when the hardened material milk is mixed to improve the soft ground, a hardened material having a high strength expression is required particularly when a high improved strength is required. As such a hardener blend having high strength development, a cement-blast furnace slag-gypsum three-component system is known (see, for example, Patent Documents 3 and 4).
[0006]
[Patent Document 1]
JP 57-100180 A (Claim 1)
[Patent Document 2]
Japanese Patent Laid-Open No. 5-208853 (Claim 1)
[Patent Document 3]
JP 54-111391 A (Claim 1)
[Patent Document 4]
JP-A-60-137396 (Claim 1)
[0007]
[Problems to be solved by the invention]
However, this system exhibits higher strength against sludge and organic clay than cement and cement-slag two-component systems, but against sand and sandy soil, cement and cement As a result of the experiments by the present inventors, it has been clarified that the strength is not necessarily high as compared with the blast furnace slag system.
[0008]
Therefore, the development of a hardened material with high expressibility suitable for soft ground improvement in the case of sand or sandy soil as the target soil has been an issue.
[0009]
[Means for Solving the Problems]
As a result of repeated researches by the present inventors to solve the above-mentioned problems, a specific amount of blast furnace slag powder having a specific brane specific surface area and fine powder of limestone having a specific brane specific surface area are blended in a cement base material. As a result, a hardener composition exhibiting high strength development was found even when sandy or sandy soil prepared in a milky state was mixed, and the present invention was invented.
[0010]
That is, the present invention provides a cured material of interest soil soft ground is sand or sandy soil, ground granulated blast furnace slag Blaine specific surface area of 3000~8000cm2 / g to ordinary portland down sheet 1 00 parts by weight It is a hardener composition comprising 50 to 300 parts by weight of powder and 5 to 50 parts by weight of fine limestone powder having a Blaine specific surface area of 2000 to 8000 cm 2 / g.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Cement used in the present invention as long as ordinary portland down bets, not particularly limited, known, it is possible to use cement Blaine specific surface area 2000~6000cm2 / g.
[0012]
The blast furnace slag used in the present invention is a normal granulated blast furnace slag, and has a Blaine specific surface area of 3000 to 8000 cm 2 / g, preferably 3500 to 7000 cm 2 / g. Those having a Blaine specific surface area of less than 3000 cm 2 / g are inferior in strength development, and those exceeding 8000 cm 2 / g are expensive and uneconomical.
[0013]
The blending amount of the blast furnace slag used in the present invention needs to be 50 to 300 parts by weight, preferably 70 to 250 parts by weight with respect to 100 parts by weight of the cement. Even if it is less than 50 parts by weight or more than 300 parts by weight, the development of strength is unfavorable.
[0014]
Limestone fine powder used in the present invention has a Blaine specific surface area of 2000~8000cm 2 / g, preferably from 2500~7000cm 2 / g. If it is less than 2000 cm 2 / g, strength development is reduced, which is not preferable. On the other hand, if it exceeds 8000 cm 2 / g, the physical properties such as strength are not improved, and the pulverization cost increases, which is not preferable.
[0015]
The compounding quantity of the limestone fine powder used in this invention needs to be 5-50 weight part with respect to 100 weight part of cement. If it is less than 5 parts by weight or exceeds 50 parts by weight, the strength development is inferior.
[0016]
In the present invention, the cement composition can be blended with other cement admixtures and the like as long as the effects of the present invention are not impaired. Examples of the admixture include additives such as gypsum, sodium sulfate and a water reducing agent. In addition, when it is expected that breathing will occur when used in a high-pressure jet stirring method or the like, bentonite or a cellulose-based thickener is added to the above-mentioned cured material composition in a range that does not impair the effects of the present invention. You can also For example, it is preferable to add 1 to 20% by weight of the hardener composition for bentonite and about 1% by weight for cellulose thickener.
[0017]
The method for producing the curable material composition of the present invention is not particularly limited, and if necessary, the above-described components pulverized with a ball mill or the like so as to satisfy the above-described Blaine specific surface area may be mixed by a known method. . Examples of the mixing apparatus include a biaxial mixer and a tilting cylinder mixer.
[0018]
In the present invention, the construction method for improving the soft sandy soil using the curing material composition employs a conventionally known method of mixing the curing material in the form of milk or a construction method in which the powder is mixed as it is. The The construction methods to incorporate milk water ratio or W / C (water / hardener) milk is usually 60 to 150%, the amount of milk to be mixed to the soil 1 m 3 is 0.1 to 1 m 3.
[0019]
Further, the field of use of the hardener of the present invention does not include backfilling, rooting or pouring, and is a field involving mixing with soil, such as a mechanical stirring method and a high-pressure jet stirring method.
[0020]
【The invention's effect】
The hardener composition of the present invention is mixed with the soft ground, which is sand or sandy soil, in the form of powder, or water is added to the composition and kneaded to prepare a hardener milk. It is possible to improve soft ground by mixing with soft ground.
[0021]
【Example】
Hereinafter, in order to describe the present invention more specifically, examples and comparative examples will be described. However, the present invention is not limited to these examples.
[0022]
In the examples and comparative examples, pure sand soil whose soil classification is sand was used as the target soil to be hardened. This pure sand soil has a fine grain content (silt and clay content) of 9%, a moisture content of 14%, and a wet density of 1.95 g / cm 3 .
[0023]
The test for evaluating the improved strength by adding a hardener to the soil was performed by adjusting the hardener milk and mixing it in the target soil, creating a hardened specimen, and measuring the uniaxial compressive strength. The hardened material milk was adjusted at W / C 135%, and the target soil and milk were kneaded with milk: target soil = 0.5: 1 (volume ratio), filled into a mold, and cured for 28 days. The cured body specimen was 5 cmφ × 10 cmH, and the uniaxial compressive strength was measured according to the method specified in JIS A 1216.
[0024]
Example 1
Granulated blast furnace slag was pulverized with a ball mill to obtain fine powder of blast furnace slag having a brain specific surface area of 4200 cm 2 / g. Also, limestone having a CaCO 3 purity of 95% or more was ball milled to obtain a fine limestone powder having a Blaine specific surface area of 3900 cm 2 / g. 100 parts by weight and 10 parts by weight of the obtained blast furnace slag fine powder and limestone fine powder, respectively, were mixed with 100 parts by weight of ordinary Portland cement (made by Tokuyama) having a Blaine specific surface area of 3350 cm 2 / g by a Henschel mixer, and a hardener composition The thing was manufactured. Table 1 shows the Blaine specific surface area of the compounding material and the compounding weight ratio of the curing material.
[0025]
The obtained hardener composition and water were kneaded with a three-one motor at W / C = 135% for 3 minutes to prepare hardener milk. Furthermore, after mixing the obtained hardened material milk and pure sand soil at a ratio of 0.5: 1 by a soil mixer (made by Hobart, MODEL N-50 MIXER) for 3 minutes, the hardened material was cured for 28 days. The uniaxial compressive strength of the soil was measured. The results are shown in Table 1.
[0026]
Example 2
A hardener composition was produced in the same manner as in Example 1 except that the amount of fine limestone powder was 20 parts by weight.
[0027]
Using the obtained hardener composition, hardener milk was prepared in the same manner as in Example 1, and the uniaxial compressive strength of the hardener mixed soil was measured. The results are shown in Table 2.
[0028]
Example 3
A hardener composition was produced in the same manner as in Example 1 except that the blending amounts of the blast furnace slag fine powder and the limestone fine powder were 80 parts by weight and 20 parts by weight, respectively.
[0029]
Using the obtained hardener composition, hardener milk was prepared in the same manner as in Example 1, and the uniaxial compressive strength of the hardener mixed soil was measured. The results are shown in Table 2.
[0030]
Comparative Example 1
The hardened material milk was prepared in the same manner as in Example 1 using ordinary Portland cement made by Tokuyama without mixing the blast furnace slag fine powder and limestone fine powder, and the uniaxial compressive strength of the hardened material mixed soil was measured. The results are shown in Table 2.
[0031]
Comparative Examples 2-4
A hardener composition was produced in the same manner as in Example 1 except that the amount of fine limestone powder was 0, 2, and 70 parts by weight, respectively.
[0032]
Using the obtained hardener composition, hardener milk was prepared in the same manner as in Example 1, and the uniaxial compressive strength of the hardener mixed soil was measured. The results are shown in Table 2.
[0033]
Example 4 and Comparative Example 5
The Blaine specific surface area of the ground granulated blast furnace slag, respectively 6100cm 2 / g, except that a 2500 cm 2 / g was prepared a cured material composition in the same manner as in Example 2.
[0034]
Using the obtained hardener composition, hardener milk was prepared in the same manner as in Example 1, and the uniaxial compressive strength of the hardener mixed soil was measured. The results are shown in Table 2.
[0035]
Comparative Example 6
A hardener composition was produced in the same manner as in Example 2 except that the specific surface area of the limestone powder was 1000 cm 2 / g.
[0036]
Using the obtained hardener composition, hardener milk was prepared in the same manner as in Example 1, and the uniaxial compressive strength of the hardener mixed soil was measured. The results are shown in Table 2.
[0037]
Example 5
A hardener composition was produced in the same manner as in Example 1 except that the blending amounts of the blast furnace slag fine powder and the limestone fine powder were 200 parts by weight and 25 parts by weight, respectively.
[0038]
Using the obtained hardener composition, hardener milk was prepared in the same manner as in Example 1, and the uniaxial compressive strength of the hardener mixed soil was measured. The results are shown in Table 2.
[0039]
Comparative Example 7
A hardener composition was produced in the same manner as in Example 1 except that the blending amounts of the blast furnace slag fine powder and the limestone fine powder were 40 parts by weight and 15 parts by weight, respectively.
[0040]
Using the obtained hardener composition, hardener milk was prepared in the same manner as in Example 1, and the uniaxial compressive strength of the hardener mixed soil was measured. The results are shown in Table 2.
[0041]
Comparative Example 8
A hardener composition was produced in the same manner as in Example 1 except that the blending amounts of blast furnace slag fine powder and limestone fine powder were 400 parts by weight and 25 parts by weight, respectively.
[0042]
Using the obtained hardener composition, hardener milk was prepared in the same manner as in Example 1, and the uniaxial compressive strength of the hardener mixed soil was measured. The results are shown in Table 2.
[0043]
Comparative Example 9
A hardener composition was produced in the same manner as in Example 2, except that anhydrous gypsum having a brain specific surface area of 4150 cm 2 / g was used instead of the limestone fine powder.
[0044]
Using the obtained hardener composition, hardener milk was prepared in the same manner as in Example 1, and the uniaxial compressive strength of the hardener mixed soil was measured. The results are shown in Table 2.
[0045]
[Table 1]
[0046]
[Table 2]
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