Valorizing wind turbine blade waste in mortar: mechanical and environmental impact

The disposal of turbine blades after exceeding service life presents a significant challenge in the context of green energy and industrial sustainability. This study investigates the effects of recycled turbine blade powder (RTBP) and recycled turbine blade fibre (RTBF) on the mechanical performance and environmental impact of mortar incorporating silica fume, with potential applications in coastal engineering. The experimental program involved partial replacement of silica sand with RTBP at 5%, 10%, and 15%, and incorporation of RTBF into the mortar matrix at 2%, 4%, and 6%. The inclusion of RTBP and RTBF resulted in substantial improvements in mechanical properties. Compressive strength increased by up to 45%, tensile strength by 25%, and flexural strength by 80% compared to the control mix. The significant enhancements in fracture energy and stiffness were also observed. In addition, a life cycle assessment showed a 5% reduction in climate change impact and a 10% reduction across various environmental impact categories, including land use, resource depletion (fossil fuels, minerals, and metals), and water consumption. These findings highlight the potential of RTBP and RTBF as sustainable, performance-enhancing alternatives in eco-friendly mortar production.