Abandoned ash pond beds, representing a vast resource of land, must have their stability ascertained under seismic conditions, as pond ash (PA) is prone to liquefaction. This study employed strain-controlled cyclic triaxial tests on large samples (70 mm \(\times \) 140 mm) to evaluate the dynamic properties of PA and the effectiveness of stabilization using sustainable waste admixtures. PA samples were collected from locations ranging from the inflow point (coarser) to the outflow point (finer) to account for spatial variation. The shear modulus (G) of the coarser PA near the inflow was observed to be greater than the finer PA near the outflow, and G decreases with increasing shear-strain amplitude and frequency. The damping ratio is greater in the finer ash. Waste Crumb Rubber (CR) and Coir Fiber (CF) were mixed with PA to enhance stability. Liquefaction resistance improved significantly when CR was added; the PA (85%) + CR (15%) mix took the maximum number of cycles to liquefy. Conversely, CF had essentially no effect on the number of cycles required to initiate liquefaction, but it significantly increased the dynamic shear modulus. The composite mix, PA (84%) + CR (15%) + CF (1%), was identified as optimal, showing greater liquefaction resistance than all PA-CF mixes and a greater G than all PA-CR mixes. The results confirm that the area near the inflow is more suitable for reclamation and that stabilization with this composite provides better overall dynamic properties for construction over ash pond beds.
