Sustainable Foundations: Integration of Recycled Materials and Geosynthetics in Intelligent Design

The demand for innovative, sustainable foundation engineering solutions has increased due to the rising pressure to lessen the environmental impact of major developments. The integration of geosynthetics and recycled materials into intelligent foundation design is critically examined in this work as a means of achieving robust, low-carbon, and resource-efficient infrastructure systems. This paper's thematic analysis and structured literature review demonstrate how waste-derived materials, including fly ash, recycled concrete aggregates, waste plastics, and industrial by-products, can successfully replace conventional building materials in ground improvement and foundation applications. Furthermore, geosynthetics—such as geotextiles and geogrids—provide lightweight, long-lasting, and eco-friendly reinforcement substitutes that improve soil performance while using less material. The study also looks at how real-time monitoring, sensor technologies, and artificial intelligence (AI) might improve structural performance, maximise material selection, and prolong the life of foundation systems. The results of life cycle assessment (LCA) and life cycle cost analysis (LCCA) show significant economic and environmental advantages, such as lower energy use, greenhouse gas emissions, and overall project costs. However, the main obstacles to broad adoption are found to be issues like material heterogeneity, a lack of standardisation, and a limited degree of digital integration. To promote sustainable foundation practices through material innovation, digital transformation, and the concepts of the circular economy, the study ends by offering practical suggestions for researchers, industry practitioners, and legislators. The results provide insightful information on how smart, sustainable foundation design may support the global shift to more resilient and environmentally friendly built environments.