The built environment is fundamental to our daily lives, yet it is a major contributor to resource consumption and environmental pollution. With increasing construction demands in the Netherlands, sustainable solutions are urgently needed. The Dutch government aims to be climate neutral by 2050, with a 55% CO₂ reduction target by 2030. One strategy to support these goals is the reuse of structural elements from existing buildings, minimizing material demand and construction waste.

This research explores the feasibility of reusing cast-in-situ concrete elements in new building structures. Since these elements were not designed for disassembly, their reintegration poses structural and practical challenges, including cutting effects, transport, changes in support conditions, force distribution and reconnection detailing. A literature review and theoretical analysis were conducted to assess the structural implications of reuse. Additionally, two case studies were analyzed to validate theoretical challenges in real-world scenarios.

Several reconnection methods were designed and evaluated using a Multi-Criteria Analysis (MCA), considering element modification, applicability of standard techniques, construction effort, overdimensioning and required precision during placement. The results demonstrate that both fixed and hinged connections, with reused elements or in combination with new ones, can be successfully implemented. However, for initial application, hinged connections combining reused and new elements are recommended as the most practical approach.

The study concludes that reusing cast-in-situ concrete elements is structurally viable, provided that reconnection detailing and structural adaptation are carefully considered. For large-scale implementation, further research is needed to develop standardized assessment methods, align with modern design codes, and validate reconnection performance through full-scale testing. Additionally, exploring digital tools for inventory management and adaptive design could further support reuse feasibility. Addressing these challenges will help establish structural reuse as a standard practice, strengthening its role in circular construction strategies.

This design report presents the outcomes of a multidisciplinary project undertaken by a team with diverse backgrounds in civil engineering. The project focuses on a preliminary design for a new marina in San Antonio Este, Argentina, with the purpose of serving as a recreational spot and a terminal for a nautical connection to San Antonio Oeste. Recreational activities include whale watching and swimming with sea lions. Sustainability is a key guiding principle, aiming to blend the marina with the natural environment and add value to the region. The report starts with an introduction outlining the project’s background, goals, and scope, followed by a detailed methodology for the design process. The area study section highlights the environmental and hydrometeorological conditions of the project location, emphasizing the challenges posed by a significant tidal range. It also discusses the choice of a water bus stop location in San Antonio Oeste and provides recommendations for further data collection and development. The design stage presents the chosen preliminary design, detailing the pier, floating pontoon, gangway, mooring field, and boat ramp. Finally, the need is noted for more precise data, environmental assessments, and geotechnical investigations to improve the design.