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Lignin is an organic industrial by-product, stockpiles of which are rapidly accumulating worldwide. A feasibility investigation was carried out with respect to the stabilization of silty soils using lignin. The fall cone test method was employed to determine the undrained shear strength () and Atterberg limits of the lignin-stabilized silty soil with 7 days of curing. In addition, scanning electron microscopy (SEM) was conducted to qualitatively evaluate the changes in the microstructure of silty soil after treatment and better understand the mechanisms controlling the improvement in of the stabilized silty soil. The study revealed that the of silty soil increased with an increase in lignin content. This was mainly attributed to the bonding effect of lignin-based cementing materials, which creates the aggregation of soil particles and fills the pores between detached particles. The liquid limit () increased remarkably with increasing lignin content and the …