The primary focus of this study revolves around the utilization of sintered fly ash (SFA) aggregate as a partial replacement for coarse aggregate in concrete pavement. The aim is to improve the environmental sustainability of concrete pavement while still maintaining its structural integrity under mechanical loads. By incorporating SFA aggregate, notable enhancements in the thermal behaviour of rigid pavement can be achieved, attributed to the increased void content and reduced thermal conductivity of the material. Through a series of experiments, coarse aggregate was systematically substituted with SFA aggregate in intervals of 10%, up to a 40% volumetric replacement ratio. The design of the rigid pavement adhered to Indian standards, with a consistent water-cement ratio of 0.36, aiming to attain a minimum compressive strength of 40 N/mm2. Various mechanical properties essential for pavement sustainability were examined, including compressive strength, abrasion resistance, and impact strength. Notably, a slight reduction in compressive strength was observed as SFA was introduced into the concrete mix. A similar trend was identified in the concrete's abrasion and impact resistance behaviour. In summation, the study concludes that incorporating SFA leads to a marginal decline in the mechanical performance of concrete. However, this reduction remains within an acceptable range. More importantly, utilizing SFA within specific limits contributes positively to the sustainability of the pavement. Notably, it enhances permeability and thermal conductivity, crucial aspects of pavement performance, especially when considering environmental factors. Therefore, when judiciously employed, SFA holds promise as a valuable component in concrete pavement construction, balancing the need for mechanical robustness with improved environmental considerations.