1 Multifunctional cork – alkali-activated fly ash composites: a sustainable material to enhance buildings’ energy and acoustic performance Rui M. Novais a, *, João Carvalheiras a , Luciano Senff b , Ana M. Lacasta c , Inma R. Cantalapiedra c , Jessica Giro-Paloma d , Maria P. Seabra a , João A. Labrincha a a Department of Materials and Ceramic Engineering / CICECO-Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal b Department of Mobility Engineering, Federal University of Santa Catarina (UFSC), 89.219-600 Joinville, SC, Brazil c Barcelona School of Building Construction, Universitat Politècnica de Catalunya, Av. Doctor Marañon 44, 08028 Barcelona, Spain d Departament de Ciència de Materials | Química Física, Universitat de Barcelona, C/ Martí i Franquès 1, 08028, Barcelona, Spain *Corresponding author: Tel.: +351234370371; fax: +351234370204 E-mail address: ruimnovais@ua.pt (Rui M. Novais) Declarations of interest: none