著者

川﨑 了 小潟 暁 広吉 直樹 恒川 昌美 金子 勝比古 寺島 麗

出版者

一般社団法人 日本応用地質学会

雑誌

応用地質 (ISSN:02867737)

巻号頁・発行日

vol.51, no.1, pp.10-18, 2010 (Released:2013-03-31)

参考文献数

12

被引用文献数

14 15

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筆者らは, 土や岩の代表的なセメント物質である炭酸カルシウムまたはシリカを主成分とし, 微生物の代謝活動により土や岩の間隙や岩の割れ目を自然に閉塞させる新たな概念に基づくグラウト, すなわち, バイオグラウトを開発するための基礎的な研究を実施中である. 本論文では, 炭酸カルシウムを用いたバイオグラウト, すなわち, 炭酸カルシウム法に関して検討を実施した結果について報告する. 具体的には, 日本各地より採取した自然の土壌中に生息する微生物を用いて試験管による炭酸カルシウムの析出試験を行い, 試験時における温度の違いが炭酸カルシウム析出に与える影響について調査した. その結果, 温度5~35℃の低~中温域において, 土壌微生物により炭酸カルシウムが試験管内に析出することが示唆された. 一方, 試験に用いた土壌微生物の菌数測定および遺伝子解析を実施し, 試験前後の土壌中に含まれる微生物相の変化に関して, 生菌数, 最も出現頻度の高い菌の菌数およびその帰属分類群を用いることにより比較を行った. その結果, それらは主にPenicillium属およびAspergillus属の菌類であり, 有機栄養源を活発に代謝することにより菌数が増加したものと推定された.

著者

笹木 圭子 小林 弘幸 恒川 昌美

出版者

The Mining and Materials Processing Institute of Japan

雑誌

資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan (ISSN:09161740)

巻号頁・発行日

vol.117, no.9, pp.747-752, 2001-09-25

被引用文献数

4

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Aragonite-type of light calcium carbonate was synthesized by the successive reaction using calcined-hydrous scallop shells and calcined lime stones in the aqueous system with Mg²⁺ ions under the CO₂ bubbling. In order to obtain the high aspect ratios of aragonite, the reaction temperature and concentrations of Ca²⁺ ions in the 2nd step were important. The aspect ratio of aragonite increased when the reaction temperature was higher in the 2nd step than in the 1st step of the successive reaction. When the smaller amounts of calcium source were added in the 2nd step than in the 1st step, and the reaction temperature was lower in the 2nd step than in the 1st step, large particles of aragonite were produced with no smooth surfaces. The successive reaction was useful to extend the variety of morphologies in aragonite.

著者

笹木 圭子 本郷 大 恒川 昌美

出版者

The Mining and Materials Processing Institute of Japan

雑誌

資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan (ISSN:09161740)

巻号頁・発行日

vol.114, no.10, pp.709-713, 1998-09-25

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Aragonite-type calcium carbonate was synthesized from calcined scallop shell using carbonates of orthorohombic structure (such as SrCO3) as seeds, by bubbling CO2 at ambient temperature. The products were examined by FTIR, SEM, EPMA, and XRD. The addition of SrCO3 increased aragonite content in the products, but BaCO3 and PbCO3 did not play the role of seed crystals due to the difference of their lattice parameters to those of aragonite, whereas lattice parameters of SrCO3 are the most similar to them. With increasing SrCO3 -addition, formation of aragonite was accelerated to a limit in the amount. Light calcium carbonate rich in aragonite was formed in agglegates consisting of needle-like crystals with large specific surface areas.

著者

平島 剛 保坂 文教 本多 覚 恒川 昌美 伊藤 正澄 佐川 孝広

出版者

The Mining and Materials Processing Institute of Japan

雑誌

資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan (ISSN:09161740)

巻号頁・発行日

vol.119, no.9, pp.553-558, 2003-09-25

被引用文献数

2 2

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Fine waste concrete smaller than 5mm obtained from a recycling plant of waste concrete was used as feed and ground by a wet attrition mill. Recovery of the fine aggregate and cement hydrate powder from the ground fine waste concrete was investigated using a laboratory / pilot scale Mozley multi-gravity separator (MGS). The water absorption of the fine aggregate obtained as the high specific gravity product was less than 3.5 % and the dry density was larger than 2.4 g/cm³. The powder obtained as low specific gravity product contained about 29 % of fine aggregate. The reference for normal clinker and the mixture prepared by mixing the reference materials with 38 wt% of the powder were heated at 1,500 °C, with the hydraulic modulus adjusted to 2.18, the silica modulus to 2.8, and the iron modulus to 1.64. The phases of the clinker were identified and quantitatively determined by a microscopic point-count procedure and by the Rietveld analysis using XRD data. There was good agreement in the clinker minerals of the reference and the mixture clinkers. These results show that the fine aggregate and cement hydrate powder recovered from fine waste concrete by MGS can be recycled in cement and concrete production.

著者

笹木 圭子 本郷 大 恒川 昌美

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.114, no.10, pp.709-713, 1998-08-25 (Released:1999-10-01)

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Aragonite-type calcium carbonate was synthesized from calcined scallop shell using carbonates of orthorohombic structure (such as SrCO3) as seeds, by bubbling CO2 at ambient temperature. The products were examined by FTIR, SEM, EPMA, and XRD. The addition of SrCO3 increased aragonite content in the products, but BaCO3 and PbCO3 did not play the role of seed crystals due to the difference of their lattice parameters to those of aragonite, whereas lattice parameters of SrCO3 are the most similar to them. With increasing SrCO3 -addition, formation of aragonite was accelerated to a limit in the amount. Light calcium carbonate rich in aragonite was formed in agglegates consisting of needle-like crystals with large specific surface areas.

著者

笹木 圭子 小林 弘幸 恒川 昌美

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.117, no.9, pp.747-752, 2001 (Released:2006-01-08)

参考文献数

10

被引用文献数

3 4

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Aragonite-type of light calcium carbonate was synthesized by the successive reaction using calcined-hydrous scallop shells and calcined lime stones in the aqueous system with Mg2+ ions under the CO2 bubbling. In order to obtain the high aspect ratios of aragonite, the reaction temperature and concentrations of Ca2+ ions in the 2nd step were important. The aspect ratio of aragonite increased when the reaction temperature was higher in the 2nd step than in the 1st step of the successive reaction. When the smaller amounts of calcium source were added in the 2nd step than in the 1st step, and the reaction temperature was lower in the 2nd step than in the 1st step, large particles of aragonite were produced with no smooth surfaces. The successive reaction was useful to extend the variety of morphologies in aragonite.