Abstract:
The sustainable utilisation of Kenaf fibres (KF) as environmentally friendly
reinforcement in mortar, concrete and polymer composites promotes the concept
of a circular economy and sustainable construction. However, the hydrophilic
nature of such biofibres adversely affects their structural applications as
reinforcement in concrete, mortar and polymer. Therefore, the study examined
the effect of alkali treatment (mercerization) on the surface sorption characteristics
of KF. The effect of water sorption characteristics on the mechanical properties
of surface-modified and untreated KF was also investigated in the study.
Scanning electron microscopy was performed to examine the morphology and
microstructure of the fibre surface along with the tensile fracture of the swollen/
un-swollen fibres. The water absorption studies revealed that mercerization
reduced the overall water uptake of KF by 16%, which enhanced the adhesion
of the fibre surface. The findings provide the knowledge required by scientists
and engineers for determining the water requirements for the design of biofibrous
concrete composites
