This book provides selected papers presented at the 2nd International Conference on Durability, Repair and Maintenance of Structures, held in Porto, Portugal, March 13-14, 2025. The volume focuses on the durability, repair and maintenance processes of engineering structures. A wide range of topics like durability in civil engineering applications, fatigue and fracture characterization, repair of composite materials and structures,  structural joints durability, diagnostics and maintenance methodologies, and durability in aerospace and marine applications are covered.  The book presents novel research works and innovations in this field, useful  for students, researchers, as well as industry professionals in various fields of engineering structures.