Physical and mechanical properties of concrete reinforced with kenaf fibre

The world lacks eco-friendly materials and safe alternatives to concrete, which releases carbon dioxide due to high temperatures. Kenaf Fibre Reinforced Concrete (KFRC) could reduce CO₂ emissions and increase its usage in buildings. However, unpredictable weather affects concrete curing time, especially during monsoon seasons. Research is needed to prove the effectiveness of KFRC in concrete and its potential to improve its tensile and flexural properties while decreasing workability and compressive strength. This research aims to solve limitations and improve the mechanical and physical properties of concrete. This research is to characterize the physical and mechanical properties of KFRC and to analysis the impact of different fibre loading on the concrete properties. Preparation of KFRC is like Basic Concrete except the unit for this research the weight unit is small (wt%). Firstly, all the materials should be measured before mixing. The ratio for mix proportions is 1:3 for concrete/aggregate and for water/concrete is 1:0.5 followed with casting and compacting process. After that, all samples were carried in three different time such as 7 days, 14 days, and 28 days. Physical and mechanical testing run after the curing time, which is water absorption, compressive strength and bending strength. All the mechanical testing is used Univesal Testing Mechine (UTM). Higher water absorption rates affect surface porosity and the right amount of kenaf fiber should not exceed 0.03%. and core fibers provide concrete with more rigidity. The addition of kenaf fiber may increase void and pore, contributing to increased water absorption. Also improve post-cracking load and energy absorption capacity andchanging failure mode from brittle to ductile. Influences compressive strength by natural fiber length and fiber concentration and ideal Core fraction is 0.1%-0.2%, based on the studies applications. The study can assess the extent to which the properties of concrete can be improved and used as the main material construction. In addition, the benefits of using natural materials such as kenaf can maintain the sustainability of the environment by reducing chemical reactions.