Potential implementation of the woody biochar waste as an eco-friendly soil stabilization material in sandy environments

Mohamed Megrousse; Mahmoudi  Youcef; Abdellah Cherif Taiba; Hamou Azaiez; Mostefa Belkhatir

doi:10.7764/RDLC.23.3.497

Authors

Mohamed Megrousse Laboratory of Material Sciences and Environment, Hassiba Ben Bouali, University of Chlef, Chlef (Algeria)
Mahmoudi Youcef Laboratory of Material Sciences and Environment, Hassiba Ben Bouali, University of Chlef, Chlef (Algeria)
Abdellah Cherif Taiba Laboratory of Architecture, Cities and Environment, Hassiba Ben Bouali, University of Chlef, Chlef (Algeria)
Hamou Azaiez Laboratory of Material Sciences and Environment, Hassiba Ben Bouali, University of Chlef, Chlef (Algeria)
Mostefa Belkhatir Alexander von Humboldt Foundation Researcher, Berlin (Germany)

DOI:

https://doi.org/10.7764/RDLC.23.3.497

Keywords:

Sand, Biochar, shear strength, interlocking, dilative character

Abstract

This experimental analysis aims to develop a fundamental understanding of the geotechnical properties of soils treated with an organic material named biochar. In this context, an experimental protocol was set using the Casagrande shear box apparatus to effectively demonstrate the combined influence of the biochar fraction (F_bio=0%, 5%, 10% and 15%), the initial relative density (D_r = 20%, D_r= 54%, and D_r= 90%), and the initial normal stress (σ_n = 100, 200, and 300 kPa) on the mechanical behavior of Chlef sand. The obtained results clearly show that biochar has a significant influence on the mechanical behavior of the tested materials. Additionally, the shear strength decreases with increasing biochar content up to a threshold value of (F_bio = 10%). Beyond that, the shear strength increases with the increase of biochar content up to the value of (F_bio= 15%) for all the considered parameters. The observed trend of increasing shear strength with the addition of the biochar content (F_bio = 15%) can be attributed to the amplification of the particle interlocking due to the presence of biochar particles between the large particles of Chlef sand, inducing an increase in the dilative character of the tested materials; offering implications for various geotechnical applications. Moreover, pertinent correlations were obtained between the residual shear strength and the grain size characteristics of the sand-biochar mixtures.

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