Bio-cement production using microbially induced calcite precipitation (MICP) method: A review

To meet the demands of highly developing construction distribution over the world, the production of more amount of cement is mandatory. But, the production process of cement is highly energy consumable, environmentally unsafe, and forms crack. These issues are basic motivations to introduce new construction biomaterial using the microbially induced calcium carbonate precipitation (MICP) process. It is the production of CaCO3 in the presence of Urea, CaCl2, and Sporosarcina pasteurii bacteria. The bacteria serve as a nucleation site for Ca2+ ion attraction in its cell due to its negative charge and produces urease enzyme to facilitate urea hydrolysis. Properly produced CaCO3 helps to create a strong bond between each soil particle having high unconfined compression strength and low water permeability. In this paper, previous studies related to the production of bio-cement using MICP and factors that affect the process, namely bacteria, pH, cementation solution, injection, and temperature are thoroughly reviewed. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

This study reviews the production of bio-cement using MICP and factors affecting the process, including bacteria, pH, cementation solution, injection, and temperature. Bacteria serve as nucleation sites for Ca2+ ions, promoting the formation of CaCO3 and soil cementation. MICP can enhance the compressive strength and reduce water permeability.