Recycled hot asphalt mixtures with milled asphalt from geosynthetic-reinforced asphalt layers
DOI:
https://doi.org/10.58922/transportes.v33.e3061Keywords:
milling, RAP, reinforced asphalt, rehabilitation, geosyntheticAbstract
The increasing use of geosynthetic interlayers, such as geogrids, geocomposites, and paving mats in asphalt rehabilitation projects, has led to an increase in milling operations involving asphalt layers containing these materials. While milling conventional pavement layers is well-documented, experience with milling layers reinforced with geosynthetic polymeric or fiberglass interlayers remains limited. This study aimed to evaluate the mechanical performance of asphalt mixtures containing Reclaimed Asphalt Pavement (RAP) with geosynthetic fragments (G-RAP). An experimental section was constructed at Salvador International Airport (Brazil), featuring five test sections reinforced with geosynthetics, which were milled after construction. Field results indicated that all interlayers were millable, though with variable milling efficiencies and byproducts with different physical characteristics. A mean reduction of 18% in milling efficiency was observed in the reinforced layers compared to the unreinforced control section. The results indicate that there are no significant differences between the G-RAP millings and the control RAP, other than the presence of geosynthetic fragments, highlighting the feasibility of reusing G-RAP in applications similar to conventional RAP. The analysis of asphalt mixtures with 20% G-RAP demonstrated that the presence of geosynthetic fragments maintained the particle size distribution of the control RAP and did not compromise the resilience modulus. Furthermore, G-RAP proved beneficial for mechanical properties such as Marshall stability, flow, and indirect tensile strength, confirming its viability for use in recycled paving mixtures.
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