Development of a new land restoration and conservation technology learned from beachrock formation mechanism
Project/Area Number |
16H04404
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Geotechnical engineering
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Research Institution | Hokkaido University |
Principal Investigator |
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Project Period (FY) |
2016-04-01 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2018: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2016: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
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Keywords | ビーチロック / 炭酸カルシウム / 微生物 / 国土保全 |
Outline of Final Research Achievements |
The purpose of this study was to develop man-made beachrocks cemented by precipitated CaCO3, which were produced by using natural coastal materials. This technique endowed the man-made beachrocks with an unconfined compressive strength (UCS) of approximately 20-30 MPa after approximately one month of curing. The technique was newly developed in this study and validated for its effectiveness. A search for ureolytic bacteria that yield high urease activity was conducted in coastal areas in Japan. Several types of discovered bacteria that exhibited suitable properties for precipitating CaCO3 were isolated from soil samples in areas such as Okinawa prefecture and Hokkaido. Accelerated laboratory solidification tests on sand samples were performed using the bacteria. The results demonstrated that after three weeks, the samples yielded approximately 20 MPa of UCS as measured in needle penetration tests. In conclusion, the effectiveness of the newly developed technique was validated.
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Academic Significance and Societal Importance of the Research Achievements |
海岸コンクリート構造物の修復保全時に,コンクリートの材料となるセメントを使用せずにCaCO3を使うことでCO2排出量の削減に貢献できる。また,海岸侵食に対する国土保全に加え,地盤の液状化対策,河川堤防の修復保全などに関する対策技術の選択肢が増えることにつながる。 将来的には,従来のコンクリート製による保全技術ではなく,現地の周辺材料で自然に加速固化する人工岩盤の自己形成・自己修復・自己保全技術としての適用が期待される。
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Report
(4 results)
Research Products
(113 results)
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[Presentation] Biocementation using ureolytic bacteria: an eco-friendly alternative for treatment of mine waste in Kabwe Mine site2018
Author(s)
W. Mwandira, K. Nakashima, S. Kawasaki, M. Ito, T. Sato, T. Igarashi, M. Chirwa, K. E. Banda, I. Nyambe and M. Ishizuka
Organizer
2nd International KAMPAI Symposium & JST Mid-term Evaluation Meeting, Lusaka, Zambia, August 14
Related Report
Int'l Joint Research
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[Presentation] Study of beachrocks in East Attica2016
Author(s)
A. Karkani, N. Evelpidou, H. Maroukian and S. Kawasaki
Organizer
14th International Conference of the Geological Society of Greece
Place of Presentation
Aristotle University of Thessaloniki (Thessaloniki, Greece)
Related Report
Int'l Joint Research
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