2021 Fiscal Year Final Research Report
Development of the tempera assisted bio-based 1shot ground improvement technics.
| Project/Area Number |
19H02239
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 22030:Geotechnical engineering-related
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| Research Institution | Hiroshima University |
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Principal Investigator |
Hata Toshiro 広島大学, 先進理工系科学研究科(工), 教授 (30435424)
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| Co-Investigator(Kenkyū-buntansha) |
笠間 清伸 九州大学, 工学研究院, 教授 (10315111)
米田 純 国立研究開発法人産業技術総合研究所, エネルギー・環境領域, 主任研究員 (40760187)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 微生物固化 / テンペラ / 結晶サイズ |
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| Outline of Final Research Achievements |
In this study, The one-shot microbial solidification technique focuses on reducing the number of injection times of the chemicals. The chemicals contain the urea, calcium chloride, and urease enzyme (purified enzyme or urease production microbes). The conventional method is to produce ammonia byproducts, which will change the nitrate or nitrite that are classified as toxic chemicals. The main object of this research will be to reduce the volume of these toxic chemicals to support the additional chemicals named tempera． The advantage point of additional chemicals named tempera can enhance the crystal sizes more than the conventional MICP/EICP method.
The test results showed that the proposed method could produce higher strength with a smaller amount of calcium carbonate precipitation than the conventional technique. This phenomenon was confirmed with the SEM images and XAFS analysis. The tempera was made from the daily food waste that can promote the SDG's goals.
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| Free Research Field |
地盤工学
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| Academic Significance and Societal Importance of the Research Achievements |
1990年代から検討が進められてきた微生物固化技術では，①尿素の加水分解に伴い発生するアンモニアの処理，②目標強度達成に必要となる炭酸カルシウム析出量確保のために複数回の施工が必須である，といった課題が指摘されている．このような問題に対し，本研究では展色材（テンペラ）を組み合わせることで従来よりも大きなサイズの炭酸カルシウム結晶を砂粒子間に効率的に析出させることで従来よりも少ない固化剤添加量で必要な強度を得る新しい技術の有効性を示した．提案手法により従来技術の課題を解決できることはもちろん，展色材に食品廃棄物を活用することで農業資材と食品廃棄物を利用した新しい地盤改良技術の普及を目指す．
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