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. 2022 Oct 2;14(19):4134. doi: 10.3390/polym14194134

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Typical stress–strain curves of pure geopolymer and PFRGs with various fiber contents (a) Flax fibers: 0–4.1 wt% [97], (b) phormium tenax fibers: 0–10 wt% [116].