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Mechanical performance of glass-based geopolymer matrix composites reinforced with cellulose fibers
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SYSNO ASEP 0500393 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Mechanical performance of glass-based geopolymer matrix composites reinforced with cellulose fibers Author(s) Taveri, Gianmarco (UFM-A)
Bernardo, E. (IT)
Dlouhý, Ivo (UFM-A) RID, ORCIDNumber of authors 3 Article number 2395 Source Title Materials. - : MDPI
Roč. 11, č. 12 (2018)Number of pages 11 s. Language eng - English Country CH - Switzerland Keywords Cellulose fibers ; Cellulose modification ; Geopolymer composite ; Wastes incorporation Subject RIV JI - Composite Materials OECD category Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics Institutional support UFM-A - RVO:68081723 UT WOS 000456419200053 EID SCOPUS 85057294993 DOI 10.3390/ma11122395 Annotation 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2019
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