The aim of this work focuses on the study of the effect of moisture on the mechanical properties of natural fiber composite (NFC) plaster/Rhecktophyllum camerunense (RC). Indeed, the treated with NaOH and untreated RC fiber reinforced plaster composites are fabricated and hygro-thermally aged at 23%, 54% and 75% relative humidity at 23°C. Flexural test was carried out using a three-point bending approach according to NF EN 658-3 standard on specimen. The results indicate that the flexural properties of the aged composites decreased with increasing humidity due to the degradation of the fiber matrix interface.

Keywords: RC fiber, natural fiber composites, Water absorption, Flexural test.