Investigating the potential application of biochar on soil water retention properties (swrc) with different textures in geotechnical engineering structures

Articles in Press

Document Type : Original Article

Authors

1 Malayer university

2 Department of Engineering, Malayer University, Iran.

10.22034/road.2023.353589.2073

Abstract

Biochar is a sustainable carbon-rich product obtained through the thermal decomposition of plant and animal biomass. Soil is often amended with biochar due to beneficial properties such as carbon sequestration, improving crop growth and yield by increasing soil fertility, removing organic and inorganic pollutants, and improving soil water retention. Soil amendment with biochar changes soil water retention characteristics (SWRC). This issue is primarily due to the inherent properties of biochar, which include a large specific surface area due to pores within the particle and functional groups on the surface of biochar. SWRC is critical for agricultural soil and soil in geotechnical or geoenvironmental engineering structures due to vegetation. The effect of biochar on SWRC of agricultural soil was extensively studied. However, it is rarely studied for soil in geotechnical or geoenvironmental engineering structures, such as landfill cover, bioengineering slopes, embankments, green roofs, etc. In terms of compaction and design life, the soil in these structures is in specific conditions compared to agricultural soil. taking into account the various factors controlling the effect of biochar on SWRC, the effect of biochar amendment on soil SWRC has been reviewed and summarized. Literature review showed that soil amendment with biochar could improve SWRC, while few cases do not affect SWRC. Factors such as raw material type and heating temperature, biochar particle size, soil type, and compaction state have a role in the effect of biochar on SWRC.

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