Performance analysis of sustainable asphalt mixes containing reclaimed asphalt pavement and crumb rubber
DOI:
https://doi.org/10.15282/construction.v6i1.13458Keywords:
Reclaimed asphalt pavement, Crumb rubber , Milled material, Aggregate replacement , Marshall stability test, Resilient modulusAbstract
Due to the increased demand for aggregates in road construction, intensifying environmental issues including soil erosion, water pollution, and ecosystem degradation caused by aggregate extraction. To mitigate these impacts, this study utilized recycled materials such as reclaimed asphalt pavement (RAP) and crumb rubber (CR) as partial aggregate replacements, incorporating 40% RAP and 2–6% CR in the mix. Marshall stability, resilient modulus, and dynamic creep tests were performed to assess load-bearing capacity, stiffness, and deformation behaviour under different conditions. The Marshall test results also provided insights into the relationship between stability, flow, and stiffness. Additionally, based on existing literature and current findings, the study identifies key limitations, discusses practical applications, and proposes directions for future research. The test results showed that recycled mixes, particularly RAP40 and RAP40CR2, performed better than traditional hot mix asphalt (HMA) in the Marshall test. In the resilient modulus test, both RAP40 and RAP40CR2 outperformed the control mixture, with RAP40CR2 achieving the greatest values 42.23% and 69.9% higher at 25°C and 40°C, respectively. Similarly, dynamic creep results revealed that mixtures containing RAP40, RAP40CR2, and RAP40CR6 exhibited enhanced resistance to permanent deformation compared to the control, with RAP40CR2 providing the most significant stability improvement. Overall, the study concludes that combining RAP and CR helps mitigate environmental impacts by incorporating waste materials, while also performing well across different temperatures and loading conditions.
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