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Microbially mediated sand solidification using calcium phosphate compounds

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Title: Microbially mediated sand solidification using calcium phosphate compounds
Authors: Akiyama, Masaru Browse this author
Kawasaki, Satoru Browse this author →KAKEN DB
Keywords: Biogrout
Calcium phosphate compound
Unconfined compression strength
Ammonia source
Soil liquefaction
grouting material
amino acid
Issue Date: 1-Jun-2012
Publisher: Elsevier B.V.
Journal Title: Engineering Geology
Volume: 137-138
Start Page: 29
End Page: 39
Publisher DOI: 10.1016/j.enggeo.2012.03.016
Abstract: To evaluate the potential utility of a new biogrout based on calcium phosphate compounds (CPC) (CPC biogrout), we conducted unconfined compressive strength (UCS) tests and scanning electron microscope (SEM) observations of sand test pieces made from CPC biogrout. To produce CPC biogrout, we used soil extracts including microorganisms derived from two soils differing in pH, three amino acids, and urea as a pH increasing reactant. Temporal increase in pH was observed in slightly acidic soil by the addition of ammonia sources. On the other hand, there was no significant increase in pH in slightly alkaline soil except for urea. In most cases, the UCS of the test pieces made from CPC biogrout with soil extracts from acidic soil was higher than that without the addition of ammonia sources. Whisker-like crystals of CPC were identified SEM observation of test pieces with UCS of over 50 kPa. These results suggest that CPC biogrout has sufficient strength as a countermeasure for liquefaction and that amino acids can be made available as new pH-increasing reactants for CPC biogrout In addition, they suggest that either CPC biogrout or CPC chemical grout alone, or a combination of the two grouts, can be used depending on the various properties of grounds and soils.
Type: article (author version)
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)

Submitter: 川﨑 了

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