Cost-Benefit Analysis of Investigating the Use of Pulverized Waste-Tyre Rubber in Construction of Pre-Cast Concrete Power Cable Trenches

Abstract: The increasing demand for sustainable and cost-effective construction materials has driven research into alternative materials that can replace conventional concrete components. This study evaluates the cost-benefit analysis, mechanical performance, durability, and environmental impact of incorporating pulverized waste-tyre rubber (PWTR) as a partial replacement for cement (2%) and sand (3.5%) in the production of pre-cast concrete power cable trenches. Conventional concrete trenches face challenges such as high material costs, excessive weight, and susceptibility to cracking and water ingress, leading to increased maintenance expenses and operational failures. A systematic experimental approach was adopted, including material selection, mix design, cost estimation, mechanical testing (compressive and flexural strength), durability analysis (water absorption and acid resistance), and environmental sustainability assessment. Results showed that the PWTR-modified concrete achieved a compressive strength of 24 MPa compared to 25 MPa for conventional concrete, with significant improvements in impact resistance, flexibility, and durability. Cost analysis revealed a 16% reduction in material costs, while the environmental impact assessment projected a 4,353.76 metric ton reduction in emissions and the repurposing of over 5.3 million waste tyres, contributing to 30% landfill diversion. These findings demonstrate that PWTR-modified concrete is a viable, cost-effective, and eco-friendly alternative for infrastructure applications, particularly in utility trench construction. Future research should focus on further optimizing mix designs, investigating long-term performance, and exploring surface treatments or supplementary cementitious materials to enhance mechanical properties and durability. Keywords: Cost-effective Construction; Eco-friendly; Pulverized Waste-Tyre Rubber; Sustainable Construction. Title: Cost-Benefit Analysis of Investigating the Use of Pulverized Waste-Tyre Rubber in Construction of Pre-Cast Concrete Power Cable Trenches Author: Dominic Wambugu Mwaniki, Fundi Sanewu Isaac, Mungathia Tulatia International Journal of Recent Research in Civil and Mechanical Engineering (IJRRCME) ISSN 2393-8471 Vol. 12, Issue 1, April 2025 - September 2025 Page No: 1-10 Paper Publications Website: www.paperpublications.org Published date: 24-April-2025 DOI: https://doi.org/10.5281/zenodo.15275360 Paper Download Link (Source) https://www.paperpublications.org/upload/book/Cost-Benefit%20Analysis%20of%20Investigating%20the%20Use-24042025-5.pdf