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Experimental Study on RAP with High Recycling Content Based on High-Modulus Asphalt Mixture.
Xin Wang1, Bangwei Wu1, Zhengguang Wu1,2
1College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China.
Materials (Basel, Switzerland)
|June 27, 2025
Summary
High-modulus asphalt mixtures effectively recycle Reclaimed Asphalt Pavement (RAP), showing improved high-temperature performance and economic benefits. This method offers a sustainable approach for high-content RAP recycling in road construction.
Area of Science:
- Civil Engineering
- Materials Science
- Sustainable Construction
Background:
- Reclaimed Asphalt Pavement (RAP) contains aged asphalt with properties similar to hard asphalt.
- High-modulus asphalt mixtures (EME) are suitable for high-content RAP recycling.
- Current recycling methods face limitations in maximizing RAP utilization.
Purpose of the Study:
- To evaluate the feasibility of using RAP in High-modulus Asphalt Mixtures (EME).
- To analyze the performance of EME with varying RAP content.
- To compare the economic viability of RAP-based EME with traditional asphalt mixtures.
Main Methods:
- Characterization of reclaimed asphalt, hard asphalt, and SBS-modified asphalt.
- Design of EME13 mixtures with 0-60% RAP content.
- Comparison with Styrene-Butadiene-Styrene (SBS)-modified Sup13 mixtures.
Main Results:
- Reclaimed asphalt shares characteristics with hard asphalt, validating its use in EME.
- Increasing RAP content in EME13 improved high-temperature performance (20-60%) but slightly reduced low/intermediate-temperature crack resistance (10-20%).
- EME13 with high RAP content demonstrated significant economic advantages over SBS-modified Sup13 despite minor performance differences.
Conclusions:
- High-modulus Asphalt Mixtures (EME) can effectively incorporate high percentages of Reclaimed Asphalt Pavement (RAP).
- RAP-based EME offers a cost-effective alternative to conventional asphalt mixtures.
- This research presents a viable technical strategy for sustainable, high-content RAP recycling.
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