Abstract
The degradation of natural fibers in cementitious matrices due to alkali hydrolysis and mineralization is a main concern in the development of sustainable cementitious composites. This work aims to (1) study the degradation phenomena of flax fibers subjected to 90 days aging in cement paste and (2) investigate the effect of a zirconium dioxide coating on the durability of flax fibers in cement paste. The degradation of flax fibers was evaluated by measuring the variations in their mechanical properties. Thermogravimetric and X-ray diffraction analyses were performed to assess the degree of degradation in each condition (untreated, pre-treated, and ZrO2-treated fibers). Scanning electron microscopy and EDS analyses were carried out on the specimens which were subjected to 90 days aging in cement paste. Results show that ZrO2-treated flax fibers encountered less degradation compared to untreated and pre-treated flax fibers.
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