Abstract:

Concrete remains the fundamental material in construction, with coarse aggregates comprising more than 50% of the mix. However, the depletion of natural aggregate sources and environmental concerns have made their procurement increasingly difficult. To address this challenge, Reclaimed Asphalt Pavement (RAP) aggregates have emerged as a viable alternative. RAP aggregates are widely available due to the replacement of flexible pavements with rigid pavements in India. Their incorporation in concrete mixtures not only reduces reliance on natural aggregates but also promotes efficient waste utilization, making them an economical and environmentally responsible choice. This study examines the effects of RAP aggregates on the strength and durability of concrete pavements. The primary objective is to evaluate variations in compressive and flexural strength when RAP aggregates partially replace natural aggregates in different proportions. Concrete cubes and beams are cast and tested, with RAP replacements set at 10%, 20%, 30%, 40%, and 50%. The RAP aggregates used in this research are sourced from the transportation laboratory of the college. The experimental results highlight the potential of RAP aggregates in pavement construction. The findings indicate that up to an optimal replacement level, RAP-incorporated concrete maintains satisfactory mechanical properties. However, beyond a certain percentage, a reduction in strength is observed due to the aged and processed nature of RAP materials. Despite this, RAP-modified concrete remains structurally stable, making it a feasible alternative for pavement applications, particularly in low to medium traffic roads where durability requirements are moderate. The use of RAP aggregates offers multiple advantages, including cost reduction, conservation of natural resources, and minimizing environmental impact. Additionally, it helps in addressing the growing problem of asphalt waste disposal by repurposing it effectively. This study underscores the importance of optimizing RAP content to ensure a balance between structural performance and environmental benefits. Future research could focus on assessing the long-term durability of RAP-based concrete under real-world conditions, including exposure to traffic loads and weathering effects.

Description:

,