HYDROLOGICAL IMPLICATIONS OF USING RECYCLED ASPHALT PAVEMENT AND WASTE-BASED REJUVENATORS IN SUSTAINABLE INFRASTRUCTURE
Hydrological Implications of Using Recycled Asphalt Pavement
DOI:
https://doi.org/10.55766/sujst8951Keywords:
Fourier Transform Infrared Spectroscopy, Recycled Asphalt Pavement, Rejuvenator, Stormwater Management, Surface Runoff Reduction, Urban Hydrology, Water InfiltrationAbstract
The depletion of natural resources has accelerated the demand for sustainable solutions in urban infrastructure, especially concerning hydrological impacts. This study explores the influence of Recycled Asphalt Pavement (RAP), in combination with rejuvenators such as Waste Cooking Oil (WCO) and Waste Engine Oil (WEO), on surface runoff and water infiltration behavior in urban environments. Aimed at restoring aged bituminous binder properties, the research involves comprehensive physical, chemical, and rheological analyses to ensure pavement durability while enhancing hydrological performance. Experimental findings show that WCO significantly improves the rheological and physical characteristics of aged asphalt binders, enhancing flexibility and reducing surface impermeability. Fourier Transform Infrared Spectroscopy (FTIR) confirms chemical compatibility between VG 30 bitumen and the rejuvenators, ensuring effective binder blending. Dynamic Shear Rheometer (DSR) tests indicate that aging increases stiffness, as evidenced by a higher complex shear modulus and lower phase angles. However, WCO rejuvenation effectively reverses this, achieving a peak shear stress of 120 kPa at 10% strain, outperforming the 80 kPa at 5% strain for WEO-modified RAP. Hydrological assessments reveal that RAP mixtures with 4% WCO improve infiltration rates by 12–15% and reduce surface runoff by approximately 10% compared to conventional pavements. These outcomes underscore the dual benefits of RAP and WCO in sustainable pavement design-enhancing structural performance while supporting urban stormwater management. The study establishes a clear linkage between environmentally conscious pavement technologies and improved urban hydrology, promoting the adoption of RAP-based pavements in climate-resilient infrastructure planning.
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