Basic characteristics of environment-friendly soil-cement material with added biochar

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Publication Title
Basic characteristics of environment-friendly soil-cement material with added biochar

Abstract
This paper describes research in which carbon-rich biochar is added to a soil-cement slurry in the laboratory with the purpose of offsetting the carbon emissions of the stabilizer used in cement-treated soil. The effect of the biochar on strength development and resistance to material separation is investigated. Blast furnace cement type B is used as the stabilizer, which is added to solidify the soil. Specimens with five different ratios of stabilizer relative to the volume of the soil-water mixture are tested (40, 80, 120, 150 and 300 kg/m3) and different proportions of biochar are added to offset and more than offset the CO2 emissions of the stabilizer. The assumed CO2 sequestration resulting from biochar addition is 2.51 kg-CO2/kg, based on methodologies used for the addition of biochar to mineral soil in cropland/grassland. The unconfined compression strength of the soil-cement with biochar after curing for 28 days tends to be higher than that of the material without biochar, except for the 40 kg/m3 cases. The maximum ratio of increase in unconfined compression strength is 1.04, 1.43, 1.37, 1.36 and 1.16 for the 40 to 300 kg/m3 cases. The material segregation resistance of the soil-cement is also improved when the amount of biochar added exceeds 30 kg/m3, regardless of the amount of stabilizer added.
Authors
Yuhei Kurimoto; Y. Asaka

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

E - Environment, water and energy

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