Abstract
Coal combustion residuals (CCR) are waste products generated during the operation of coal-fired electric power stations, but the effect of CCR inclusions on the deterioration of road infrastructure at or near power plants remain uncertain. This study measured the resilient modulus (M r ) of low-plasticity clay (FS) mixtures with different proportions of CCR obtained from a coal-fired power station, without any additional cementitious substances or stabilizers. Resilient moduli were determined for both the raw materials (FS and CCR) and for mixtures ranging between 10% and 40% CCR by weight. All materials were characterized physically, chemically, and mineralogically. Resulting physical and mechanical-behavior parameters were compared across the CCR content range, specifically the change in index properties, USCS classification, maximum dry density, and resilient-modulus degradation. Results highlight the strong dependence of the soil’s resilient moduli on water content due to the inherent partially-saturated character of the material.
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