The increasing amount of waste electronic circuit boards i.e. Printed Circuit Board (PCB) is a serious environmental issue. This chapter explores the ability to use PCB waste as a sustainable addition to concrete, transforming e-waste into a valuable building material. Based on experimental data, the research highlights how adding PCB waste can improve concrete properties, like flexural and compressive strength, while also offering environmental benefits like reduction in usage of natural resources, reduction in landfill waste, and minimizing the carbon footprint of traditional concrete production. The study examines how finely mixed PCB components enhance concrete's strength, durability, and environmental efficiency, showing its suitability for modern infrastructure. It also discusses the role of this innovative material in smart infrastructure, emphasizing its contribution to sustainable development and the promotion of a circular economy. Linking e-waste management with sustainable construction provides a practical solution aligned with global sustainability goals.