The immobilisation of heavy metals from sewage sludge ash in geopolymer mortars. - Tracz, T.; Mróz, K.; Zdeb, T.; Sitarz, Mateusz; Zdeb, Tomasz; Castro Gomes, João; Grünhäuser Soares, Erick; Hager, Izabela (MATEC Web of Conferences, 2020)