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Suitable Granular Road Base from Reclaimed Asphalt Pavement.
Oswaldo Guerrero-Bustamante1,2, Amparo Guillen1, Fernando Moreno-Navarro1
1Construction Engineering Laboratory, University of Granada (LabIC.UGR), 18071 Granada, Spain.
Materials (Basel, Switzerland)
|February 26, 2025
Summary
Reclaimed Asphalt Pavement (RAP) can replace virgin materials in road base construction. This study shows RAP offers superior load-bearing capacity and reduced permanent deformation compared to traditional granular bases.
Area of Science:
- Civil Engineering
- Materials Science
- Sustainable Construction
Background:
- Road construction relies heavily on virgin granular materials.
- Recycled materials like Reclaimed Asphalt Pavement (RAP) offer sustainable alternatives.
- RAP utilization can provide environmental and cost benefits in infrastructure.
Purpose of the Study:
- To assess the feasibility of using RAP as a granular base layer in road construction.
- To evaluate the performance of RAP under simulated in-service and full-scale load conditions.
- To investigate the impact of design variables like gradation and binder content on RAP performance.
Main Methods:
- Advanced laboratory testing simulating in-service conditions.
- Full-scale demonstration of material behavior under static and dynamic loads.
- Analysis of various gradations and binder contents for RAP.
Main Results:
- RAP exhibited higher load-bearing capacity than conventional granular bases.
- RAP demonstrated improved resistance to permanent deformation.
- Elastic modulus increased by up to 30%, and permanent deformations decreased by approximately 20%.
Conclusions:
- Reclaimed Asphalt Pavement (RAP) is a viable and high-performing material for granular base layers.
- RAP utilization enhances structural performance and reduces permanent deformation in road infrastructure.
- The inherent properties of RAP, including asphalt cement content, contribute to its superior mechanical behavior.
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