The Fly-Ash Based Geopolymer Composites as an Innovative Material for Circular Michał Łach, Agnieszka Grela, Barbara Kozub, Kinga Korniejenko and Brian Azzopardi MATEC Web Conf., 322 (2020) 01016 Published online: 14 October 2020 DOI: 10.1051/matecconf/202032201016