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Durability Improvement of Biocemented Sand by Fiber-Reinforced MICP for Coastal Erosion Protection

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Title: Durability Improvement of Biocemented Sand by Fiber-Reinforced MICP for Coastal Erosion Protection
Authors: Al Imran, Md Browse this author
Nakashima, Kazunori Browse this author
Evelpidou, Niki Browse this author
Kawasaki, Satoru Browse this author →KAKEN DB
Keywords: MICP
jute fiber
soil improvement
fiber reinforcement
coastal erosion protection
Issue Date: Apr-2022
Publisher: MDPI
Journal Title: Materials
Volume: 15
Issue: 7
Start Page: 2389
Publisher DOI: 10.3390/ma15072389
Abstract: Soil improvement via MICP (microbially induced carbonate precipitation) technologies has recently received widespread attention in the geoenvironmental and geotechnical fields. The durability of MICP-treated samples remains a critical concern in this novel method. In this work, fiber (jute)-reinforced MICP-treated samples were investigated to evaluate their durability under exposure to distilled water (DW) and artificial seawater (ASW), so as to advance the understanding of long-term performance mimicking real field conditions, along with improvement of the MICP-treated samples for use in coastal erosion protection. Primarily, the results showed that the addition of fiber (jute) improved the durability of the MICP-treated samples by more than 50%. Results also showed that the wet-dry (WD) cyclic process resulted in adverse effects on the mechanical and physical characteristics of fiber-reinforced MICP-treated samples in both DW and ASW. The breakdown of calcium carbonates and bonding effects in between the sand particles was discovered to be involved in the deterioration of MICP samples caused by WD cycles, and this occurs in two stages. The findings of this study would be extremely beneficial to extend the insight and understanding of improvement and durability responses for significant and effective MICP treatments and/or re-treatments.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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