This study presents an experimental investigation into the sustainable use of waste materials in cement concrete by incorporating rubber tyre crumbs and human hair as partial substitutes for natural aggregates. Fibre-reinforced concrete is known to improve crack resistance and mechanical properties, addressing the inherent tensile weakness of conventional concrete. Human hair, an abundantly available non-degradable material, offers an economical reinforcement option, while rubber tyre crumbs enhance sustainability by reducing environmental pollution. Together, these materials contribute to better ductility, crack control, and durability of concrete. Concrete remains the most widely consumed construction material worldwide due to its strength and versatility, but the growing demand for infrastructure is exerting pressure on natural resources, leading to higher costs and ecological concerns. To overcome these challenges, this research replaces natural aggregates with rubber tyre crumbs at varying proportions (0%, 3%, 6%, 9%, and 12%) while maintaining a fixed 1.5% human hair content. The mixes were evaluated through standard tests, including compressive strength, flexural strength, split tensile strength, bulk density, water absorption, impact value, and crushing value, with a constant water–cement ratio of 0.5.Results indicated that workability decreased as the percentage of rubber tyre crumbs increased. However, compressive and tensile strengths improved up to an optimal replacement level of around 20%, after which strength properties declined. This demonstrates the potential of rubber tyre crumbs and human hair as sustainable alternatives in concrete production, promoting cost-effectiveness and environmental conservation in construction.
Sustainable concrete, Rubber tyre crumbs, Human hair fibre, Mechanical properties, Waste utilization.
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