Microbially Induced Sand Cementation Method Using &lt;i&gt;Pararhodobacter&lt;/i&gt; sp. Strain SO1, Inspired by Beachrock Formation Mechanism

Danjo, Takashi; Kawasaki, Satoru

doi:10.2320/matertrans.m-m2015842

Cited by 65 publications

(55 citation statements)

References 21 publications

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“…The precipitated carbonate crystals coat the soil particles, cement the soil matrix, fill the voids partially, hence increases the desired mechanical properties including strength and stiffness of the soil matrix [4,5]. Despite being a relatively new technique, many MICP studies have been investigated for several geotechnical applications including liquefaction control, erosion mitigation, coastline preservation, sand dunes stabilization, borehole stabilization and settlement control [6][7][8][9]. Most of the investigations have been focused on the behavior of MICP treated sand, providing information on the strength and stiffness characteristics under different testing conditions [2,5,6,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Feasibility study for slope soil stabilization by microbial induced carbonate precipitation (MICP) using indigenous bacteria isolated from cold subarctic region

et al. 2019

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Microbial induced carbonate precipitation (MICP) is relatively an innovative soil improvement technique, learnt from the bio-mediated geochemical reactions that naturally occur in the earth surface. During the MICP, CaCO 3 is metabolically precipitated in soil pores, cement the particle contacts and improves the strength and stiffness of soil. Environment temperature is one of the most key factors that determines the efficiency MICP. The purpose of this study is to investigate the feasibility of stabilizing the slope soil of cold subarctic region (Hokkaido, Japan). The implication of MICP in cold subarctic zones remains as a major challenge, as the enzymatic performance of the bacteria typically declines during lower temperatures hence insufficient formation of CaCO 3 in soil matrix. Therefore, as a potential approach, this study attempted to investigate the feasibility of using the bacteria which have been adapted to native cold climatic conditions. The objectives of this paper are evaluating (1) the effect of temperature in bacterial response, and (2) the effect of grain size distribution in cementation mechanism. The observations suggest that the enzyme activity of the bacteria is negligible at and above 30 °C, whereas it is significant at relatively lower temperatures. The comparison of treated soils suggests that the fine content in slope soil increased number of particle contacts, facilitated effective packing, and promoted the effectiveness of MICP compared to that of uniformly graded sands. Finally, the technical feasibility in slope soil stabilization was well demonstrated using model solidification test. The limitations in stabilizing the slope are also discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Feasibility study for slope soil stabilization by microbial induced carbonate precipitation (MICP) using indigenous bacteria isolated from cold subarctic region

et al. 2019

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“…Based on formation methods observed by Danjo and Kawasaki [5]- [7] the sand cementation process is very much suitable, eco-friendly, cheaper and sustainable for the areas in Asia where the temperature, sand properties and other conditions is almost same as Japan and the results of this study will contribute to the application of a new technique for coastal sand improvement and biostimulation.…”

Section: Artificial Beachrock Formation Through Beach and Sand Solidimentioning

confidence: 77%

“…Danjo and Kawasaki [5]- [7] found that, Column specimens were cemented up to UCS of 10 MPa after 28 days under the conditions (curing temperature; 30°C, injection interval; 1 day, Ca 2+ concentrations in cementation solution; 0.3 M). Based on formation methods observed by Danjo and Kawasaki [5]- [7] the sand cementation process is very much suitable, eco-friendly, cheaper and sustainable for the areas in Asia where the temperature, sand properties and other conditions is almost same as Japan and the results of this study will contribute to the application of a new technique for coastal sand improvement and biostimulation.…”

Section: Artificial Beachrock Formation Through Beach and Sand Solidimentioning

confidence: 99%

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Combination Technology of Geotextile Tube and Artificial Beachrock for Coastal Protection

Imran¹

2017

GEOMATE

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ABSTRACT:In recent years, traditional forms of river and coastal structures have become very expensive to build and maintain, because of the shortage of natural rock. Therefore, the materials used in hydraulic and coastal structures are changing from traditional rubble and concrete systems to cheaper, sustainable, and ecofriendly materials and systems such as artificial rock, gabion, slags, geosynthetics, and so on. Moreover, shorelines are being continually eroded by the wave action of the sea, and the river and coastal structures are frequently damaged by both anthropogenic and natural causes such as over wash and storm. How to deal with eroding coastal problems is a main topic of this article. Recently, artificial beachrock and geotextile tube technology has changed from being an alternative construction technique and, in fact, has advanced to become the prime solution of choice. Therefore, the objectives of the present study is to find out the feasibility to protect coastal erosion in Asia along with using artificial beachrock and geotextile tube technology in a cheaper, sustainable and eco-friendly way.

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“…This method can be applied to ground improvement and coastal protection [6]- [8], and it is believed that it is environmentally friendly and low cost. In previous studies, precipitation in sand specimens was evaluated by measuring the unconfined compressive strength (UCS).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Porosity in Biogrouted Sand Using Microfocus X-Ray Ct

Mitsuyama¹,

Nakashima²,

Kawasaki³

2017

GEOMATE

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Biogrouting is a method employed for ground improvement based on microbially induced calcium carbonate precipitation. It is commonly believed that biogrout has environmental and economic benefits. However, there remains the need to clearly understand the internal structure of biogrouted soil. In this study, we use microfocus X-ray computed tomography (CT) to evaluate the porosity in biogrouted sand. X-ray CT is useful as a non-distractive inspection tool. First, we prepare small specimens using coral sand at different dilution rates of culture solution. After carrying out a solidification test for 2 wks., we perform an unconfined compressive strength (UCS) test and measure the porosity of the specimens. Our aim is to investigate the influence of the dilution rate on the UCS and the porosity of sand specimens. The results show that a lower dilution rate resulted in a lower sand-specimen porosity and an increase in the UCS. We investigate the precipitation that fills a void. Then, we investigate the relationship between UCS and the ratio of porosity. There was a negative correlation between UCS and porosity, which closely agrees with previous research. We confirm the validity of the result, and we determine the UCS from the porosity.

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Microbially Induced Sand Cementation Method Using <i>Pararhodobacter</i> sp. Strain SO1, Inspired by Beachrock Formation Mechanism

Cited by 65 publications

References 21 publications

Feasibility study for slope soil stabilization by microbial induced carbonate precipitation (MICP) using indigenous bacteria isolated from cold subarctic region

Feasibility study for slope soil stabilization by microbial induced carbonate precipitation (MICP) using indigenous bacteria isolated from cold subarctic region

Combination Technology of Geotextile Tube and Artificial Beachrock for Coastal Protection

Evaluation of Porosity in Biogrouted Sand Using Microfocus X-Ray Ct

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