Abstract
Biomineralization is an environment -friendly technology to improve engineering properties of soil. One of common bio-mineralization processes is microbially induced calcite precipitation (MICP) . In this chapter, sand solidification tests were conducted using Pararhodobacter sp ., which is a local ureolytic bacteria isolated from the sand near beachrock in Okinawa, Japan. The goal of this paper is to perform solidification of the specimen having an estimated unconfined compressive strength (UCS) of more than several MPa for soil improvement and to investigate the influence of various factors on engineering properties (i.e., curing temperature, injection interval of cementation solution, Ca2+ concentration, curing time, bacterial population, re-injection of bacteria and particle size of sand) of treated soils catalyzed by ureolytic bacteria . The result of estimated UCS value showed that all the studied factors have an obvious effect on the MICP-treated sand. More than 3 MPa of the estimated UCS value was obtained from the solidified samples, and also, it was obtained more than 10 MPa of estimated UCS value for the testing cases of changing concentration of cementation media and re-injection of the bacterial solution after 7 days of curing period. UCS, SEM-EDX, X-ray CT, CaCO3 content of the sample and color measurement tests were conducted. Completely solidified samples were obtained by changing different testing conditions. The results indicate that the average estimated UCS value varied from 3.1 to 4.4 MPa. Overall, the results of this study will contribute to the application of a new technique for sand improvement and bio-stimulation.
Part of this book chapter has been published as: G. G. N. N. Amarakoon and S. Kawasaki (2018) Factors affecting sand solidification using MICP with Pararhodobacter sp. Materials Transactions 59 (1) 72–81. The Mining and Materials Processing Institute of Japan granted permission for the same to use in this book.
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Acknowledgements
This work was partly supported by JSPS KAKENHI Grant Number JP16H04404 and Grant for Environmental Research Projects from the Sumitomo Foundation.
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Amarakoon, G.G.N.N., Kawasaki, S. (2019). Utilization of Microbially Induced Calcite Precipitation for Sand Solidification Using Pararhodobacter sp.. In: Achal, V., Mukherjee, A. (eds) Ecological Wisdom Inspired Restoration Engineering. EcoWISE. Springer, Singapore. https://doi.org/10.1007/978-981-13-0149-0_4
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