Geotechnical behavior of a beta-1,3/1,6-glucan biopolymer-treated residual soil

Abstract. Biopolymers, polymers produced by living organisms, are used in various fields (e.g., medical, food, cosmetic, medicine) due to their beneficial properties. Recently, biopolymers have been used for control of soil erosion, stabilization of aggregate, and to enhance drilling. However, the inter-particle behavior of such polymers on soil behavior are poorly understood. In this study, an artificial biopolymer (β-1,3/1,6-glucan) was used as an engineered soil additive for Korean residual soil (i.e., hwangtoh ). The geotechnical behavior of the Korean residual soil, after treatment with β-1,3/1,6-glucan, were measured through a series of laboratory approaches and then analyzed. As the biopolymer content in soil increased, so did its compactibility, Atterberg limits, plasticity index, swelling index, and shear modulus. However, the treatment had no effect on the compressional stiffness of the residual soil, and the polymer induced bio-clogging of the soil’s pore spaces while resulting in a decrease in hydraulic conductivity.

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