Abstract
A novel method that combines enzyme-induced carbonate precipitation (EICP) and lignin was proposed to improve the mechanical properties of silt in the Yellow River flood area. The silt in this area is characterized by poor particle gradation, weak cohesion and low strength. It is essential to focus on the modification of silt by environmentally friendly methods. The work described in this paper investigated the unconfined compressive strength (UCS), elastic modulus, cohesion, internal friction angle and microstructure of EICP-lignin treated silt. A series of laboratory experiments was conducted, including the unconfined compressive strength (UCS) test and consolidated undrained (CU) triaxial test. The results proved that the EICP-lignin treatment enhanced silt obtained from the Yellow River flood area. All the strength parameters increased and then decreased with increasing lignin content, and their values were optimum for approximately 5% lignin. Specifically, the optimum UCS strength, cohesion and internal friction angle improved to approximately 5, 10, and 3 times those of untreated silt. In addition, the strength parameters gradually increased with curing time. Microstructure analyses were used to illustrate the physical basis for the improvement in strength with increasing aggregation of lignin and calcite.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.