Effects of fibers length on the properties of kenaf fibers- reinforced geopolymer concrete

Geopolymer composites reinforced with natural Fibers: A review of recent advances in processing and properties

“…However, this energy depends mainly on fiber stiffness, fiber size, fiber orientation, fiber content, and fiber-binder interfacial bonding. Natural fibers such as hemp [44,148], jute [149], kenaf [150,151], flax [152][153][154], and wood [155] have been widely used to reinforce geopolymer composites, considering their excellent mechanical properties, wide availability, cost-effectiveness, biodegradability, non-toxicity, and low density. However, natural fiber-geopolymer interfacial bonding depends on the external surface and aspect ratio (length/diameter) of the natural fiber.…”

“…Additionally, fiber size is another important factor that affects the compressive behavior of fiber-reinforced composites. Abbas et al [150] investigated the effects of kenaf fibers lengths (20 mm, 30 mm, and 40 mm) on compressive behavior of plain geopolymer. It was observed that the increase in kenaf fibers length reduced the compressive strength of geopolymer composites.…”

“…Interestingly, this value is much higher than that observed for compressive strength. However, increasing fiber length has normally found to enhance the bending strength of geopolymer composite [150,159,163]. Long fibers result in a homogeneous dispersion of fibers in geopolymer binder, while a random distribution of short fibers results in many fibers not penetrating a single plane, which decreases the bending strength.…”