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Mechanical performance of glass-based geopolymer matrix composites reinforced with cellulose fibers
- 1.0500393 - ÚFM 2019 RIV CH eng J - Journal Article
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. ISSN 1996-1944. E-ISSN 1996-1944
EU Projects: European Commission(XE) 642557 - CoACH
Institutional support: RVO:68081723
Keywords : Cellulose fibers * Cellulose modification * Geopolymer composite * Wastes incorporation
OECD category: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics
Impact factor: 2.972, year: 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.
Permanent Link: http://hdl.handle.net/11104/0293353
Number of the records: 1