Comparative Analysis of Reinforcement Parameters on Yellow River Silt Solidified by MICP and EICP Technology

The Yellow River silt (YRS) is commonly used as construction material to address lack of sand resource. However, the YRS has the shortcoming of poor mechanical characteristic. Hence, in current study, enzyme-induced calcite precipitation (EICP) and microbial-induced calcite precipitation (MICP) techniques were adopted as the reinforce measures for the purpose of promoting the engineering properties of YRS. Among various factors that may influence the solidification effect, concentration of cement solution C and the number of grouting times N were selected for emphatical inspecting. Technical measures including unconfined compressive strength (UCS) test, the CaCO₃ content test, and scanning electron microscope (SEM) were utilized to assess the solidification effect with different biotreatment technology. The results show that the YRS samples solidified with EICP technology can reach higher UCS and CaCO₃ content. Compared to MICP technology, EICP technology is more capable of enhancing the geotechnical properties of YRS. The findings of this study can make contribution to the resource utilization of YRS.