Mechanical performance of glass-based geopolymer matrix composites reinforced with cellulose fibers

0500393 - ÚFM 2019 RIV CH eng J - Článek v odborném periodiku
Taveri, Gianmarco - Bernardo, E. - Dlouhý, Ivo
Mechanical performance of glass-based geopolymer matrix composites reinforced with cellulose fibers.
Materials. Roč. 11, č. 12 (2018), č. článku 2395. E-ISSN 1996-1944
GRANT EU: European Commission(XE) 642557 - CoACH
Institucionální podpora: RVO:68081723
Klíčová slova: Cellulose fibers * Cellulose modification * Geopolymer composite * Wastes incorporation
Obor OECD: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics
Impakt faktor: 2.972, rok: 2018

Glass-based geopolymers, incorporating fly ash and borosilicate glass, were processed in conditions of high alkalinity (NaOH 10-13 M). Different formulations (fly ash and borosilicate in mixtures of 70-30 wt% and 30-70 wt%, respectively) and physical conditions (soaking time and relative humidity) were adopted. Flexural strength and fracture toughness were assessed for samples processed in optimized conditions by three-point bending and chevron notch testing, respectively. SEM was used to evaluate the fracture micromechanisms. Results showed that the geopolymerization efficiency is strongly influenced by the SiO2/Al2O3 ratio and the curing conditions, especially the air humidity. The mechanical performances of the geopolymer samples were compared with those of cellulose fiber-geopolymer matrix composites with different fiber contents (1 wt%, 2 wt%, and 3 wt%). The composites exhibited higher strength and fracture resilience, with the maximum effect observed for the fiber content of 2 wt%. A chemical modification of the cellulose fiber surface was also observed. © 2018 by the authors.
Trvalý link: http://hdl.handle.net/11104/0293353