A greater range of construction materials with innovative qualities are needed as modern engineering methods. It involves modifying existing materials qualities and combining them with additional suitable materials. Here one of the natural fibre is used to boost concrete's tensile strength. However, the primary drawback of choosing natural fibre is that it is biodegradable. To combat this, sodium hydroxide (NaOH) treatment is applied with the aim of enhancing fibre strength and reducing water absorption capacity. The ionisation of the hydroxyl group to the alkoxide is hence promoted by the addition of aqueous sodium hydroxide (NaOH) to natural fibre. Thus, the cellulosic fibril, the level of polymerization, and the extraction of lignin and hemi-cellulose components are all directly impacted by alkaline processing. The breaking of hydrogen bonds in the network structure caused by alkaline treatment is a significant alteration that raises surface roughness. When compared to normal cement concrete, this treatment increases the tensile strength of concrete by removing some of the lignin, wax, and oils that are present on the exterior of the fibre cell wall.