40498 2017 eng 1 10 PRO 107 conferenceobject RILEM Publications S.A.R.L. 0 -- -- -- The aim of this study was to develop a lightweight composite façade element for refurbishment of existing façades. It was crucial to minimize the thermal bridges and to undercut the thermal requirement of the system existing façade new element. The awareness of the environmental impact of the building sector is increasing. In this context, ultra-high performance concrete (UHPC) materials are shown to be promising alternatives with advantages such as lower embodied energy and reduced environmental impact. Predictions suggest that UHPC composite elements for building envelopes could have other benefits such as an increased service life, optimized use of building area due to thinner elements and minimized maintenance due to the absence of reinforcement or use of non-corrosive reinforcing materials such as carbon fibers. In this framework, composite elements have been developed combining an autoclaved aerated concrete insulation layer with an external UHPC supporting layer. The results show that the lightweight composite element has a good performance in term of thermal transmittance and minimization of thermal bridges. Proceedings of XIV DBMC - 14th International Conference on Durability of Building Materials and Components 978-2-35158-159-9 XIV DBMC - 14th International Conference on Durability of Building Materials and Components Gent, Belgium 29.05.2017 31.05.2017 Lorenzo Miccoli Patrick Fontana O. Kreft B. Pietruszka A. Lukaszewska A. Klinge eng uncontrolled Composite panels eng uncontrolled Ultra-high performance concrete eng uncontrolled Autoclaved aerated concrete eng uncontrolled Hygrothermal behaviour eng uncontrolled Production technology Ingenieurwissenschaften und zugeordnete Tätigkeiten Sanitär- und Kommunaltechnik; Umwelttechnik Verlagsliteratur Datei im Netzwerk der BAM verfügbar ("Closed Access")