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Improvement of the compressive strength of soft clayey soil using the bio-treatment method

Corresponding Author : Md. Nazmul Islam Rafi (rafi1998.nir@gmail.com)

Authors : M. S. Rahman (msr.ceesust@gmail.com), M. H. Rahman (taufiquehasan1994@gmail.com), A. Hameem (aseer.hameem@gmail.com), M. N. I. Rafi (rafi1998.nir@gmail.com)

Keywords : Ground Improvement, MICP, Microbe, Nutrient, Unconfined Compressive Strength

Abstract :

As environmental concerns, economic viability, and application practicability have grown in importance, the creation of novel methods to enhance the engineering qualities of soil has emerged as a new area of geotechnical engineering. Numerous techniques of soil improvement have been put forth in this respect in an effort to meet sustainability requirements, lower the overall cost of construction, and ensure safe field application. To fulfill these requirements, the Microbially Induced Calcite Precipitation (MICP) technique is now widely used. The objective of this particular study was to design a comprehensive experimental protocol to measure the improved strength of bio-treated cohesive soil in different conditions. To achieve this objective, three types of treatment (non-seeded treatment, bioconsortium treatment, and yeast treatment) were used to trigger calcium carbonate precipitation. Three variables were considered in this study, such as the concentration of the treating agent (bio-consortium or yeast), the concentration of the cementation reagent (urea and calcium chloride), and the treatment duration (days). For comparison, non-treated soil samples without MICP treatment were prepared. After treatment, the samples were tested with unconfined compressive strength measuring tools, which indicated a significant improvement of the MICP-treated soil with time. Among different treatment processes, yeast-treated soil with 18% water content under the B category (6% urea and 6

Published on October 23rd, 2024 in Volume 4 Issue 2, Civil Engineering, Environment and Architecture