Dynamics of Biochar-Silty Clay Interaction Using In-House Fabricated Cyclic Loading Apparatus: A Case Study of Coastal Clay and Novel Peach Biochar from the Qingdao Region of China

Junwei Liu, Suriya Prakash Ganesan, Xin Li, Ankit Garg, Aman Singhal, Karthik Datta Dosetti and Haibao Feng
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Junwei Liu: Institute of Civil Engineering, Qingdao University of Technology, Shibei District, Qingdao 266033, China
Suriya Prakash Ganesan: Institute of Civil Engineering, Qingdao University of Technology, Shibei District, Qingdao 266033, China
Xin Li: Institute of Civil Engineering, Qingdao University of Technology, Shibei District, Qingdao 266033, China
Ankit Garg: Department of Civil and Environmental Engineering, Guangdong Engineering Centre for Structure Safety and Health Monitoring, Shantou University, Jinping District, Shantou 515063, China
Aman Singhal: Institute of Civil Engineering, Qingdao University of Technology, Shibei District, Qingdao 266033, China
Karthik Datta Dosetti: Institute of Civil Engineering, Qingdao University of Technology, Shibei District, Qingdao 266033, China
Haibao Feng: State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Nankai, Tianjin 300072, China

Sustainability, 2020, vol. 12, issue 7, 1-14

Abstract: Biochar has been recently investigated as an eco-friendly material in bio-engineered slopes/landfill covers. A majority of recent studies have focused on analyzing water retention behavior while very few have examined dynamic behavior (i.e., cyclic loading due to earthquake, wind, or wave) of biochar amended soil. As far as the authors are aware, there is no study on the dynamic behavior of biochar amended soils. Considering the above mentioned study as a major objective, field excavated soil was collected and mixed with in-house produced biochar from peach endocarps, at three amendment rates (5%, 10%, and 15%). The un-amended bare soil and biochar amended soil were imposed to a cyclic load in a self-designed apparatus and the corresponding stress-strain parameters were measured. Dynamic parameters such as shear modulus and damping ratio were computed and the results were compared between bare and biochar amended soil. Furthermore, the residual cyclic strength of each soil types were correlated with an estimated void ratio to understand the interrelation between dynamic loading responses and biochar amended soils. The major outcomes of this study show that the addition of biochar decreases the void ratio, thereby increasing the shear modulus and residual cyclic strength. However, the modulus and strength values attenuates after 15 cycles due to an increase in pore water pressure. In contrary, at higher amendment rates, Biochar Amended Soils (BAS) forms clay-carbon complex and decreases both shear modulus and residual cyclic strength.

Keywords: biochar amended soils; dynamic loading; shear modulus; residual cyclic strength; void ratio (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
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