GABRIELA EMILIA POPITA1, CRISTINA ROSU1*, DORIN MANCIULA1, OFELIA CORBU2, ANTOANELA POPOVICI3, OVIDIU NEMES4, ANDREI VICTOR SANDU5,6*, MARIAN PROOROCU7, SEBASTIAN BOGDAN DAN1 1 Babes Bolyai University, Faculty of Environmental Science and Engineering 30 Fantanele Str., 400294, Cluj Napoca, Romania 2 Technical University of Cluj-Napoca, Central Laboratory of the Faculty of Civil Engineering, 28 Memorandumului Str., 400114, Cluj Napoca, Romania 3 National Environmental Protection Agency, 294 Splaiul Independenþei, 060031 Bucharest, Romania 4 Technical University, Cluj-Napoca, Faculty of Materials and Environmental Engineering, 28 Memorandumului Str., 400114, Cluj Napoca, Romania 5 Gheorghe Asachi Technical University of Iasi, Faculty of Materials Science and Engineering, 41 D. Mangeron Blvd., 700050, Iasi, Romania 6 Centre of Excellence Geopolymer & Green Technology (CeGeoGTech), School of Material Engineering, University Malaysia Perlis (UniMAP), P. O. Box 77, d/a Pejabat Pos Besar, 01000 Kangar, Perlis Malaysia 7 University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca, 3-5 Calea Manastur, 400372, Cluj Napoca, Romania