@article { author = {}, title = {AN INVESTIGATION OF BACTERIAL CALCIUM CARBONATE PRECIPITATION IN ORGANIC SOIL FOR GEOTECHNICAL APPLICATIONS}, journal = {Iranian Journal of Science and Technology Transactions of Civil Engineering}, volume = {39}, number = {C1}, pages = {201-205}, year = {2015}, publisher = {Shiraz University}, issn = {2228-6160}, eissn = {}, doi = {10.22099/ijstc.2015.2768}, abstract = {This study focused on the process of bacterial calcium carbonate (CaCO3) precipitation(BCCP) in organic soil. Two samples, organic soil and sand, in glass boxes having dimensions6×6×2 cm were immersed in bacterial medium (Bacillus pasteurii, urea, and CaCl2) for 4 days.During the treatment period, the samples were treated with urea medium and CaCl2 every 6 h.Changes in pH values were monitored at different time intervals. At the end of the treatmentperiod, the amount of CaCO3 was determined with a calcimeter test. The test results showed thatthe pH values fluctuated between 9 and 9.4 during the treatment period. This range of pH valuesindicates that the treatment medium is appropriate for BCCP. The amount of precipitated CaCO3in the organic soil sample increased about 8% compared with the untreated sample. Calciumcarbonate precipitation in sand is found to be higher than the organic soil. The results weresupported by Scanning Electron Microscopy (SEM) analysis and Energy-Dispersive X-ray (EDX)analysis.}, keywords = {Bacillus pasteurii,organic soil,bacterial calcium carbonate precipitation,calcimeter test}, url = {https://ijstc.shirazu.ac.ir/article_2768.html}, eprint = {https://ijstc.shirazu.ac.ir/article_2768_e820632390aed4e03e31dacc7c37027f.pdf} }