Non-invasive interventions on three concrete structures of high cultural and aesthetic value

This contribution reports on the restoration of three concrete structures of high cultural and aesthetic values located in Switzerland. The three case studies highlight the importance of understanding cultural values of engineering structures and concrete architecture in particular, in view of interventions to satisfy demands of modern use. Non-invasive interventions for re- establishing durability and for structural strengthening were developed and realized. In all cases, UHPFRC (Ultra-High Performance Fiber-Reinforced Cement-based composite material) has been applied. It is shown how non-invasive and thus low cost interventions can be performed on “old” concrete structures with adequate respect of cultural and aesthetic values in order to improve them in view of a second service duration.