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.
Highlights
The conversion of organic bio-waste material into an energy has received significant attention as a sustainable alternative in various applications
The bio-derived resource materials serves as a solution for environmental management to scale down global threats such as Greenhouse gas emission, climate change, and waste management [1,2]
The conversion of bioresource materials reduces the dependency of other resource materials and promotes the direction towards a bio-based economy [3,4]
Summary
The conversion of organic bio-waste material into an energy has received significant attention as a sustainable alternative in various applications. The bio-derived resource materials serves as a solution for environmental management to scale down global threats such as Greenhouse gas emission, climate change, and waste management [1,2]. The conversion of bioresource materials reduces the dependency of other resource materials and promotes the direction towards a bio-based economy [3,4]. The unique properties of biochar is considered an appropriate tool to impede climate change [6,7] and sequester carbon in the soil [8,9]. The properties on state of the art studies on Biochar Amended Soils (BAS) gained much recognition in several applications
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