JP4841912B2 - Magnesium oxide powder for soil hardening material - Google Patents
Magnesium oxide powder for soil hardening material Download PDFInfo
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- JP4841912B2 JP4841912B2 JP2005272597A JP2005272597A JP4841912B2 JP 4841912 B2 JP4841912 B2 JP 4841912B2 JP 2005272597 A JP2005272597 A JP 2005272597A JP 2005272597 A JP2005272597 A JP 2005272597A JP 4841912 B2 JP4841912 B2 JP 4841912B2
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Description
本発明は、土壌硬化材用の酸化マグネシウム粉末に関する。 The present invention relates to a magnesium oxide powder for a soil hardening material.
酸化マグネシウム粉末は、軟弱土壌の硬化材として用いられることがある。酸化マグネシウム粉末は、土壌硬化材として同じく用いられる酸化カルシウムと比べて低アルカリであることから、環境への負荷が少ないなどの利点がある。土壌硬化材用の酸化マグネシウム粉末には、一般に軽焼酸化マグネシウム粉末が用いられる。 Magnesium oxide powder is sometimes used as a hardener for soft soils. Magnesium oxide powder is less alkaline than calcium oxide, which is also used as a soil hardening material, and therefore has advantages such as less environmental burden. Lightly burned magnesium oxide powder is generally used as the magnesium oxide powder for soil hardening material.
特許文献１には、軽焼酸化マグネシウム粉末と、リン酸塩、硫酸塩、炭酸塩、有機酸のいずれか一種以上とからなる土壌固化材が開示されている。この特許文献１の実施例では、軽焼酸化マグネシウム粉末として全て市販試薬の軽焼酸化マグネシウム粉末が用いられている。 Patent Document 1 discloses a soil-solidifying material comprising light-burned magnesium oxide powder and at least one of phosphate, sulfate, carbonate, and organic acid. In the Examples of Patent Document 1, commercially available light burned magnesium oxide powder is used as the light burned magnesium oxide powder.
特許文献２には、軽焼酸化マグネシウム粉末と、石膏、ポルトランドセメント及び高炉スラグから選ばれる一種以上、水溶態リン酸肥料又は活性汚泥焼却灰、又は吸着焼成メタリン酸、及びオキシカルボン酸塩又はケトカルボン酸塩からなる土壌固化材が開示されている。この特許文献２の実施例では、軽焼酸化マグネシウム粉末として全て中国産軽焼酸化マグネシウム粉末が用いられている。
上記のように、酸化マグネシウム粉末は軟弱土壌の硬化材として有用な材料であるが、従来の土壌硬化材に用いられている酸化マグネシウム粉末は反応性が低いため、これを軟弱土壌に添加しても土壌の硬化が発現するのが遅いという問題がある。このため、土壌硬化の発現が速い酸化マグネシウム粉末が望まれている。但し、酸化マグネシウム粉末の反応性が高くなりすぎて、酸化マグネシウム粉末の土壌への添加と同時に急激に硬化が始まると、軟弱土壌と酸化マグネシウム粉末とを均一に混合するのが難しくなるという実用上の問題が発生する。
従って、本発明の目的は、実用上扱いやすい速度で、土壌硬化が発現する酸化マグネシウム粉末を提供することにある。
As described above, magnesium oxide powder is a useful material as a hardener for soft soil, but magnesium oxide powder used in conventional soil hardeners has low reactivity, so it can be added to soft soil. There is also a problem that the hardening of the soil is slow to develop. For this reason, the magnesium oxide powder whose expression of soil hardening is quick is desired. However, the reactivity of the magnesium oxide powder becomes too high, and if hardening begins suddenly at the same time as the magnesium oxide powder is added to the soil, it is difficult to uniformly mix the soft soil and the magnesium oxide powder. Problems occur.
Accordingly, an object of the present invention is to provide a magnesium oxide powder that develops soil hardening at a practically manageable speed.
本発明は、平均ペリクレース結晶子径が１０〜５０ｎｍの範囲にあり、ＢＥＴ比表面積が５〜２０ｍ2／ｇの範囲にあり、平均粒子径が１〜５μｍの範囲にあって、粒子径が１０μｍを超える粒子の割合が１０体積％を超えることがなく、そして見かけ密度が０．３〜０．８ｇ／ｃｍ3の範囲にある土壌硬化材用の酸化マグネシウム粉末にある。本発明の酸化マグネシウム粉末は、硫酸根を０．５〜２．５質量％の範囲の量にて含んでいてもよい。 The present invention has an average periclase crystallite diameter in the range of 10 to 50 nm, a BET specific surface area in the range of 5 to 20 m 2 / g, an average particle diameter in the range of 1 to 5 μm, and a particle diameter of 10 μm. In the magnesium oxide powder for soil hardening material, the proportion of particles exceeding 10% does not exceed 10% by volume and the apparent density is in the range of 0.3 to 0.8 g / cm 3 . The magnesium oxide powder of the present invention may contain a sulfate group in an amount in the range of 0.5 to 2.5% by mass.
本発明の土壌硬化材用酸化マグネシウム粉末を用いることによって、従来の土壌硬化材用酸化マグネシウム粉末を用いる場合と比べて、軟弱土壌を適度な速さで硬化させることが可能となる。 By using the magnesium oxide powder for soil hardening material of the present invention, soft soil can be hardened at an appropriate speed as compared with the case of using the conventional magnesium oxide powder for soil hardening material.
本発明の土壌硬化材用酸化マグネシウム粉末は、平均ペリクレース結晶子径が１０〜５０ｎｍの範囲にあり、ＢＥＴ比表面積が５〜２０ｍ2／ｇの範囲にあり、平均粒子径が１〜５μｍの範囲にあって、粒子径が１０μｍを超える粒子の割合が１０体積％を超えることがなく、そして見かけ密度が０．３〜０．８ｇ／ｃｍ3の範囲にある。 The magnesium oxide powder for soil hardening material of the present invention has an average periclase crystallite diameter in the range of 10 to 50 nm, a BET specific surface area in the range of 5 to 20 m 2 / g, and an average particle diameter in the range of 1 to 5 μm. Thus, the proportion of particles having a particle diameter exceeding 10 μm does not exceed 10% by volume, and the apparent density is in the range of 0.3 to 0.8 g / cm 3 .
平均ペリクレース結晶子径は、１０〜５０ｎｍの範囲、好ましくは２０〜４０ｎｍの範囲である。平均ペリクレース結晶子径は、酸化マグネシウム粒子を形成する結晶子の平均径である。平均ペリクレース結晶子径は、酸化マグネシウム粉末の反応性を表す指標の一つとなる。平均ペリクレース結晶子径が上記の範囲よりも小さいと、反応性が高くなりすぎることになる。一方、平均ペリクレース結晶子径が上記の範囲よりも大きいと、土壌硬化の発現が遅くなる。 The average periclase crystallite diameter is in the range of 10 to 50 nm, preferably in the range of 20 to 40 nm. The average periclase crystallite diameter is an average diameter of crystallites forming the magnesium oxide particles. The average periclase crystallite diameter is one of the indexes representing the reactivity of the magnesium oxide powder. When the average periclase crystallite diameter is smaller than the above range, the reactivity becomes too high. On the other hand, when the average periclase crystallite diameter is larger than the above range, the onset of soil hardening is delayed.
ＢＥＴ比表面積は、５〜２０ｍ2／ｇの範囲、好ましくは１０〜２０ｍ2／ｇの範囲である。ＢＥＴ比表面積は、酸化マグネシウム粉末の反応性を表す指標の一つとなる。ＢＥＴ比表面積が上記の範囲よりも小さいと、土壌硬化の発現が遅くなる。一方、ＢＥＴ比表面積が上記の範囲よりも大きいと、反応性が高くなりすぎることになる。 BET specific surface area in the range of 5 to 20 m 2 / g, preferably in the range of 10 to 20 m 2 / g. The BET specific surface area is one of the indexes representing the reactivity of the magnesium oxide powder. When the BET specific surface area is smaller than the above range, the onset of soil hardening is delayed. On the other hand, if the BET specific surface area is larger than the above range, the reactivity becomes too high.
平均粒子径は、１〜５μｍの範囲である。平均粒子径は、酸化マグネシウム粉末の分散性やハンドリング性を表す指標の一つとなる。平均粒子径が上記の範囲よりも大きいと、土壌が軟弱な場合に均一に分散させることが難しくなる。一方、平均粒子径が上記の範囲よりも小さいと、粉末のハンドリング性が低下する。 The average particle size is in the range of 1-5 μm. An average particle diameter becomes one of the indexes showing the dispersibility and handling property of magnesium oxide powder. When the average particle size is larger than the above range, it is difficult to uniformly disperse when the soil is soft. On the other hand, when the average particle diameter is smaller than the above range, the handling property of the powder is lowered.
粒子径が１０μｍを超える粒子の割合は、１０体積％未満である。酸化マグネシウム粉末の分散性を表す指標の一つとなる。粒子径が１０μｍを超える粒子の割合が１０体積％を超えると、土壌が軟弱な場合に均一に分散させることが難しくなる。 The proportion of particles having a particle diameter exceeding 10 μm is less than 10% by volume. It becomes one of the indexes showing the dispersibility of the magnesium oxide powder. When the ratio of the particles having a particle diameter exceeding 10 μm exceeds 10% by volume, it becomes difficult to uniformly disperse when the soil is soft.
見かけ密度は、０．３〜０．８ｇ／ｃｍ3の範囲、好ましくは０．５〜０．８ｇ／ｃｍ3の範囲である。見かけ密度は、酸化マグネシウム粉末の分散性やハンドリング性を表す指標の一つとなる。見かけ密度が上記の範囲よりも小さいと、粉末のハンドリング性が低下する。一方、見かけ密度が上記の範囲よりも大きいと、土壌が軟弱である場合に均一に分散させることが難しくなる。 The apparent density is in the range of 0.3 to 0.8 g / cm 3 , preferably in the range of 0.5 to 0.8 g / cm 3 . The apparent density is one of the indexes representing the dispersibility and handling properties of the magnesium oxide powder. When the apparent density is smaller than the above range, the handleability of the powder is lowered. On the other hand, when the apparent density is larger than the above range, it is difficult to uniformly disperse when the soil is soft.
本発明の土壌硬化材用酸化マグネシウム粉末は、海水に水酸化カルシウムなどのアルカリを加えて生成させた水酸化マグネシウム粒子を、６５０〜９００℃の温度、好ましくは６８０〜９００℃の温度にて焼成することによって製造することができる。海水から得られる水酸化マグネシウム粒子には、海水中の硫酸根が取り込まれるため、この水酸化マグネシウム粒子を上記の温度範囲にて焼成して得られる酸化マグネシウム粉末には、通常は硫酸根が０．５〜２．５質量％の範囲の量にて含まれる。焼成時間は、焼成温度や水酸化マグネシウム粒子サイズなどの要因によって異なるが、一般に１０〜１２０分間である。 The magnesium oxide powder for soil hardening material of the present invention is obtained by firing magnesium hydroxide particles produced by adding alkali such as calcium hydroxide to seawater at a temperature of 650 to 900 ° C, preferably 680 to 900 ° C. Can be manufactured. Since magnesium hydroxide particles obtained from seawater incorporate sulfate radicals in seawater, the magnesium oxide powder obtained by firing the magnesium hydroxide particles in the above temperature range usually has no sulfate radical. Included in an amount in the range of 5-2.5% by weight. The firing time varies depending on factors such as the firing temperature and the magnesium hydroxide particle size, but is generally 10 to 120 minutes.
本発明の土壌硬化材用酸化マグネシウム粉末は、リン酸塩（例、過リン酸石灰）、硫酸塩（例、石膏）、有機酸塩（例、クエン酸ナトリウム）などの土壌硬化材として用いられている公知の材料と混合して用いることができる。リン酸塩の混合割合は、酸化マグネシウム粉末１００質量部に対して１〜１００質量部の範囲であることが好ましい。硫酸塩の混合割合は、酸化マグネシウム粉末１００質量部に対して１〜１００質量部の範囲であることが好ましい。有機酸塩の混合割合は、酸化マグネシウム粉末１００質量部に対して０．０１〜２０質量部の範囲であることが好ましい。 The magnesium oxide powder for soil hardening material of the present invention is used as a soil hardening material for phosphates (eg, superphosphate), sulfates (eg, gypsum), and organic acid salts (eg, sodium citrate). It can be used by mixing with known materials. The mixing ratio of the phosphate is preferably in the range of 1 to 100 parts by mass with respect to 100 parts by mass of the magnesium oxide powder. The mixing ratio of the sulfate is preferably in the range of 1 to 100 parts by mass with respect to 100 parts by mass of the magnesium oxide powder. The mixing ratio of the organic acid salt is preferably in the range of 0.01 to 20 parts by mass with respect to 100 parts by mass of the magnesium oxide powder.
本発明の酸化マグネシウム粉末は、従来の土壌硬化材用の軽焼酸化マグネシウム粉末と混合して用いてもよい。この場合、本発明の酸化マグネシウム粉末の配合割合は、酸化マグネシウム粉末全体の４０質量％以上であることが好ましく、６０質量％以上であることがさらに好ましい。 The magnesium oxide powder of the present invention may be used by mixing with a light burned magnesium oxide powder for a conventional soil hardening material. In this case, the blending ratio of the magnesium oxide powder of the present invention is preferably 40% by mass or more, and more preferably 60% by mass or more of the entire magnesium oxide powder.
本発明の土壌硬化材用酸化マグネシウム粉末は、硬化対象の軟弱土壌に粉末の状態で添加してもよいし、水に分散させた懸濁液の状態で添加してもよい。硬化対象の土壌への酸化マグネシウム粉末の添加量は、土壌の固形分に対して１〜３０質量％となる量、好ましくは５〜２０質量％となる量である。 The magnesium oxide powder for soil hardening material of the present invention may be added in the form of powder to the soft soil to be hardened, or may be added in the form of a suspension dispersed in water. The amount of magnesium oxide powder added to the soil to be hardened is an amount of 1 to 30% by mass, preferably 5 to 20% by mass, based on the solid content of the soil.
実施例及び比較例にて用いた酸化マグネシウム粉末について、平均ペリクレース結晶子径、ＢＥＴ比表面積、平均粒子径、粒子径が１０μｍを超える粒子の割合、見かけ密度、純度及び硫酸根量を測定した。平均ペリクレース結晶子径、平均粒子径、粒子径が１０μｍを超える粒子の割合及び見かけ密度は、下記の方法により測定した。 For the magnesium oxide powders used in Examples and Comparative Examples, the average periclase crystallite diameter, BET specific surface area, average particle diameter, ratio of particles having a particle diameter exceeding 10 μm, apparent density, purity, and sulfate radical amount were measured. The average periclase crystallite diameter, the average particle diameter, the ratio of particles having a particle diameter exceeding 10 μm, and the apparent density were measured by the following methods.
［平均ペリクレース結晶子径］
Ｘ線回折装置を用いて、管電圧４０ｋＶ、管電流２０ｍＡの条件で酸化マグネシウム粉末ペリクレース結晶子の（２００）面のＸ線回折パターンを測定して、平均ペリクレース結晶子径を求める。標準試料にはシリコンを使用する。
[Average periclase crystallite diameter]
Using an X-ray diffractometer, the X-ray diffraction pattern of the (200) plane of the magnesium oxide powder periclase crystallite is measured under the conditions of a tube voltage of 40 kV and a tube current of 20 mA to determine the average periclase crystallite diameter. Silicon is used as the standard sample.
［平均粒子径、粒子径が１０μｍを超える粒子の割合］
酸化マグネシウム粉末をイオン交換水に投入し、超音波分散処理を３０秒間行なった後、レーザ回折式粒度分布測定装置（ＳＫレーザーＬＭＳ−３０、（株）セイシン企業製）を用いて粒度分布を測定して、平均粒子径、及び粒子径が１０μｍを超える粒子の割合を求める。
[Average particle diameter, ratio of particles having a particle diameter exceeding 10 μm]
Magnesium oxide powder is put into ion-exchanged water, and after ultrasonic dispersion treatment is performed for 30 seconds, the particle size distribution is measured using a laser diffraction particle size distribution analyzer (SK Laser LMS-30, manufactured by Seishin Enterprise Co., Ltd.). Then, the average particle diameter and the ratio of the particles having a particle diameter exceeding 10 μm are obtained.
［見かけ密度］
容量５０ｃｍ3メスシリンダーに、酸化マグネシウム粉末を、メスシリンダーの５０ｃｍ3の標線まで少しずつゆっくり投入した後、メスシリンダー内の酸化マグネシウム粉末の質量を秤量して、下記の式により見かけ密度を算出する。
見かけ密度（ｇ／ｃｍ3）＝酸化マグネシウム粉末の質量（ｇ）／５０（ｃｍ3）
[Apparent density]
After slowly adding magnesium oxide powder to a 50 cm 3 measuring cylinder in small increments up to the 50 cm 3 marked line of the measuring cylinder, weigh the mass of magnesium oxide powder in the measuring cylinder and calculate the apparent density using the following formula. To do.
Apparent density (g / cm 3 ) = mass of magnesium oxide powder (g) / 50 (cm 3 )
［実施例１］
海水に、１５質量％濃度の水酸化カルシウム懸濁液を、海水中のマグネシウム量に対するカルシウム量としてモル比で０．９となるように添加して、水酸化マグネシウム粒子を生成させ、水酸化マグネシウム懸濁液を得た。得られた水酸化マグネシウム懸濁液を固形分濃度が３５質量％となるように濃縮した。濃縮した水酸化マグネシウム懸濁液を工業用水にて洗浄した後、ろ過、乾燥して水酸化マグネシウム粉末を得た。得られた水酸化マグネシウム粉末の平均粒子径は３．３μｍであった。この水酸化マグネシウム粉末をロータリー型キルン焼成炉にて７００℃の温度で３０分間焼成して、酸化マグネシウム粉末を得た。
得られた酸化マグネシウム粉末は、平均ペリクレース結晶子径が３１ｎｍ、ＢＥＴ比表面積が１５．８ｍ2／ｇ、平均粒子径が３．３μｍ、粒子径が１０μｍを超える粒子の割合が７体積％、見かけ密度が０．６６ｇ／ｃｍ3であり、純度が９５．８８質量％、硫酸根の含有量が１．８２質量％であった。
[Example 1]
A calcium hydroxide suspension having a concentration of 15% by mass is added to seawater so that the molar ratio of calcium to the amount of magnesium in seawater is 0.9, thereby producing magnesium hydroxide particles. A suspension was obtained. The obtained magnesium hydroxide suspension was concentrated so that the solid content concentration was 35% by mass. The concentrated magnesium hydroxide suspension was washed with industrial water, then filtered and dried to obtain magnesium hydroxide powder. The average particle diameter of the obtained magnesium hydroxide powder was 3.3 μm. This magnesium hydroxide powder was fired at a temperature of 700 ° C. for 30 minutes in a rotary kiln firing furnace to obtain a magnesium oxide powder.
The obtained magnesium oxide powder has an average periclase crystallite diameter of 31 nm, a BET specific surface area of 15.8 m 2 / g, an average particle diameter of 3.3 μm, and a ratio of particles having a particle diameter exceeding 10 μm is 7% by volume. The density was 0.66 g / cm 3 , the purity was 95.88% by mass, and the sulfate radical content was 1.82% by mass.
上記のようにして得た酸化マグネシウム粉末１００質量部に対して、過リン酸石灰３０質量部、無水石膏５質量部、そしてクエン酸ナトリウム０．１質量部を加えて、ヘンシェルミキサーにて５分間混合して粉末組成物を製造した。 To 100 parts by mass of the magnesium oxide powder obtained as described above, 30 parts by mass of superphosphate lime, 5 parts by mass of anhydrous gypsum, and 0.1 part by mass of sodium citrate are added, and then for 5 minutes using a Henschel mixer. A powder composition was produced by mixing.
得られた粉末組成物１００ｇを正確に量り取り、コニカルビーカに入れた。次いで、粉末組成物が均質に湿潤するまで水を加えて湿潤混合物を得た（湿潤混合物の調製に必要な水の量は６５ｇであった）。得られた湿潤混合物の上方１０ｃｍの高さから、１分毎に重さ５ｇのステンレス製針を自然落下させ、湿潤混合物にステンレス製針を突き刺して、湿潤混合物の凝結の進行を調べた。湿潤混合物の調製後、湿潤混合物に突き刺したステンレス製針の侵入深さが湿潤混合物の厚さの５０％に相当する深さになるまでの時間（凝結始発時間）は、２０分であった。さらに、湿潤混合物の調製後、湿潤混合物に突き刺したステンレス製針の侵入深さが湿潤混合物の厚さの５％に相当する深さになるまでの時間（凝結終結時間）は２７分であった。 100 g of the obtained powder composition was accurately weighed and placed in a conical beaker. Water was then added until the powder composition was uniformly wet to obtain a wet mixture (the amount of water required to prepare the wet mixture was 65 g). From the height of 10 cm above the obtained wet mixture, a stainless needle having a weight of 5 g was naturally dropped every minute, and the wet mixture was pierced with a stainless needle to examine the progress of condensation of the wet mixture. After the preparation of the wet mixture, the time until the penetration depth of the stainless needle pierced into the wet mixture reached a depth corresponding to 50% of the thickness of the wet mixture (condensation start time) was 20 minutes. Furthermore, after the preparation of the wet mixture, the time required for the penetration depth of the stainless needle inserted into the wet mixture to reach a depth corresponding to 5% of the thickness of the wet mixture (condensation completion time) was 27 minutes. .
［比較例１］
酸化マグネシウム粉末として、平均ペリクレース結晶子径が２２ｎｍ、ＢＥＴ比表面積が３１．０ｍ2／ｇ、平均粒子径が３．６μｍ、粒子径が１０μｍを超える粒子の割合が１．９体積％、見かけ密度が０．１１ｇ／ｃｍ3であり、純度９８．８６質量％、硫酸根の含有量０．３９質量％の酸化マグネシウム粉末（関東化学（株）製、試薬１級品）を用いた以外は、実施例１と同様にして、粉末組成物を製造した。
[Comparative Example 1]
As the magnesium oxide powder, the average periclase crystallite size is 22 nm, the BET specific surface area is 31.0 m 2 / g, the average particle size is 3.6 μm, the proportion of particles having a particle size exceeding 10 μm is 1.9% by volume, the apparent density Is 0.11 g / cm 3 , and a magnesium oxide powder having a purity of 98.86% by mass and a sulfate radical content of 0.39% by mass (manufactured by Kanto Chemical Co., Ltd., reagent grade 1 product) is used. A powder composition was produced in the same manner as in Example 1.
得られた粉末組成物１００ｇを正確に量り取り、コニカルビーカに入れた。次いで、次いで、粉末組成物が均質に湿潤するまで水を加えて湿潤混合物を得た（湿潤混合物の調製に必要な水の量は２５０ｇであった）。得られた湿潤混合物に実施例１と同様にしてステンレス製針を突き刺して、湿潤混合物の凝結の進行を調べた。その結果、凝結始発時間は２３０分であった。しかし、湿潤混合物の調製後、７２０分経過しても、湿潤混合物に突き刺したステンレス製針の侵入深さは、湿潤混合物の厚さの５％に相当する深さにはならなかった。すなわち、市販試薬の酸化マグネシウム粉末を用いた粉末組成物は、本発明に従う酸化マグネシウム粉末を用いた粉末組成物（実施例１）と比べて凝結が起こりにくいことが確認された。 100 g of the obtained powder composition was accurately weighed and placed in a conical beaker. Then, water was added until the powder composition was uniformly wetted to obtain a wet mixture (the amount of water required to prepare the wet mixture was 250 g). The obtained wet mixture was pierced with a stainless steel needle in the same manner as in Example 1 to examine the progress of the condensation of the wet mixture. As a result, the initial setting time was 230 minutes. However, even after 720 minutes have passed since the preparation of the wet mixture, the penetration depth of the stainless needle stuck into the wet mixture did not correspond to a depth corresponding to 5% of the thickness of the wet mixture. That is, it was confirmed that the powder composition using the magnesium oxide powder as a commercially available reagent is less likely to cause coagulation than the powder composition using the magnesium oxide powder according to the present invention (Example 1).
［比較例２］
酸化マグネシウム粉末として、平均ペリクレース結晶子径が５８ｎｍ、ＢＥＴ比表面積が１２．９ｍ2／ｇ、平均粒子径が１５．８μｍ、粒子径が１０μｍを超える粒子の割合が６７体積％、見かけ密度が０．６８ｇ／ｃｍ3であり、純度９６．９４質量％、硫酸根の含有量０．０３質量％の酸化マグネシウム粉末（中国産軽焼酸化マグネシウム粉末）を用いた以外は、実施例１と同様にして、粉末組成物を製造した。
[Comparative Example 2]
As the magnesium oxide powder, the average periclase crystallite size is 58 nm, the BET specific surface area is 12.9 m 2 / g, the average particle size is 15.8 μm, the proportion of particles having a particle size exceeding 10 μm is 67% by volume, and the apparent density is 0. .68 g / cm 3 , except that magnesium oxide powder (China light burned magnesium oxide powder) having a purity of 96.94% by mass and a sulfate radical content of 0.03% by mass was used. Thus, a powder composition was manufactured.
得られた粉末組成物１００ｇを正確に量り取り、コニカルビーカに入れた。次いで、粉末組成物が均質に湿潤するまで水を加えて湿潤混合物を調製した（湿潤混合物の調製に必要な水の量は６５ｇであった）。得られた湿潤混合物に実施例１と同様にしてにステンレス製針を突き刺して、湿潤混合物の凝結の進行を調べた。その結果、湿潤混合物の調製後７２０分経過しても、湿潤混合物に突き刺したステンレス製針の侵入深さは、湿潤混合物の厚さの５０％に相当する深さにはならなかった。すなわち、中国産軽焼酸化マグネシウム粉末を用いた粉末組成物は、本発明に従う酸化マグネシウム粉末を用いた粉末組成物（実施例１）と比べて凝結が起こりにくいことが確認された。 100 g of the obtained powder composition was accurately weighed and placed in a conical beaker. A wet mixture was then prepared by adding water until the powder composition was uniformly wet (the amount of water required to prepare the wet mixture was 65 g). The resulting wet mixture was pierced with a stainless steel needle in the same manner as in Example 1 to examine the progress of condensation of the wet mixture. As a result, even after 720 minutes had passed since the preparation of the wet mixture, the penetration depth of the stainless needle stuck into the wet mixture did not become a depth corresponding to 50% of the thickness of the wet mixture. That is, it was confirmed that the powder composition using the light-burned magnesium oxide powder produced in China is less likely to set than the powder composition using the magnesium oxide powder according to the present invention (Example 1).
［実施例２］
標準砂（豊浦砂）に前記実施例１にて製造した粉末組成物と水とを、粉末組成物が標準砂（豊浦砂）に対して９質量％となる量、水が全体量に対する含水率として９質量％となる量にて加え、ソイルミキサーにて５分間混合した。
得られた混合物を、内径１００ｍｍ、高さ１２７ｍｍの円柱状容器に充填し、次いで、円柱状容器内の混合物に高さ３０ｃｍの位置から２．５ｋｇの分銅を２５回繰り返し落として、混合物を円柱状に加圧成形した。円柱状混合物を容器から抜き出して、防湿フィルムで被覆して、温度２５℃、相対湿度９５％ＲＨ以上に調節した恒温高湿槽内で２８日間養生させた。
２８日養生後の円柱状混合物の圧縮強度を、ＪＩＳ−Ａ−１２１６「土の一軸圧縮試験方法」に準拠した方法により測定したところ、３９００ｋＮ／ｍ2であった。
[Example 2]
The standard sand (Toyoura sand), the powder composition produced in Example 1 and water, the amount of the powder composition to 9% by mass with respect to the standard sand (Toyoura sand), the water content to the total amount In an amount of 9% by mass and mixed for 5 minutes with a soil mixer.
The obtained mixture was filled into a cylindrical container having an inner diameter of 100 mm and a height of 127 mm, and then 2.5 kg of weight was repeatedly dropped from the position of 30 cm to the mixture in the cylindrical container 25 times, and the mixture was circularly Press-molded into a columnar shape. The columnar mixture was extracted from the container, covered with a moisture-proof film, and cured for 28 days in a constant temperature and high humidity tank adjusted to a temperature of 25 ° C. and a relative humidity of 95% RH or higher.
It was 3900 kN / m < 2 > when the compressive strength of the cylindrical mixture after 28-day curing was measured by the method based on JIS-A-1216 "uniaxial compression test method of soil".
［比較例３］
粉末組成物に前記比較例２にて製造した粉末組成物を用いる以外は実施例２と同様にして、円柱状混合物を作成し、この円柱状混合物の２８日養生後の圧縮強度を測定した。その結果、圧縮強度は１５００ｋＮ／ｍ2であり、実施例２で得られた圧縮強度の１／２以下であった。
[Comparative Example 3]
A cylindrical mixture was prepared in the same manner as in Example 2 except that the powder composition produced in Comparative Example 2 was used as the powder composition, and the compressive strength after 28-day curing of this cylindrical mixture was measured. As a result, the compressive strength was 1500 kN / m 2 , which was 1/2 or less of the compressive strength obtained in Example 2.
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