Abstract
The thermal backfill is important for underground heavy crude oil storage tanks and oil pipelines to restrict the heat transfer through the source. The native soil might not be satisfactory as backfill material and, subsequently, require appropriate amendment. Biochar is a less thermally conductive material that can be amended to native soil to make it suitable for thermal backfill. A previous study found that adding different biochar fractions reduces the thermal characteristics of soil. However, in a previous study, soil-biochar composite (SBC) thermal characteristics were measured at maximum possible compaction states that are achieved at the maximum dry density and optimum water content. Consequently, the above results are the combination of the influence of maximum possible compaction states and biochar fractions. Therefore, to study the effect of different biochar fractions solitary on the thermal characteristics of SBC, the samples were compacted under two different conditions. In the first case, the sample was compacted at fixed load, while it was compacted at fixed density in the second case. The water content of SBC was kept the same for both cases. The soil was amended with three distinct biochar percentages (5, 10, and 15%) and three distinct biochar fractions [coarse (4.7–2 mm), medium (2–0.425 mm), and fine (0.425 mm-0.075 mm)], and their thermal characteristics were measured. The thermal characteristics of biochar admixed soil consistently reduced with a decrease in the size of biochar granules. Comparatively, the reverse trend was observed for the samples compacted at fixed density.
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Patwa, D., Ravi, K., Sreedeep, S. (2023). Impact of Biochar Fraction on Thermal Characteristics of Soil-Biochar Composite. In: Muthukkumaran, K., Rathod, D., Sujatha, E.R., Muthukumar, M. (eds) Transportation and Environmental Geotechnics . IGC 2021. Lecture Notes in Civil Engineering, vol 298. Springer, Singapore. https://doi.org/10.1007/978-981-19-6774-0_29
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