Research on the Performance of Ultra-High-Content Recycled Asphalt Mixture Based on Fine Separation Technology
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View abstract on PubMed
Summary
This summary is machine-generated.Fine separation technology enhances reclaimed asphalt pavement (RAP) utilization by reducing variability. An optimal 60% RAP content is recommended for sustainable, high-performance asphalt mixtures.
Area Of Science
- Materials Science
- Civil Engineering
- Sustainable Construction
Background
- Reclaimed asphalt pavement (RAP) presents challenges in variability for high-value utilization.
- Fine separation technology offers a potential solution for pre-treating RAP.
Purpose Of The Study
- To investigate the efficacy of fine separation technology for RAP pre-treatment.
- To optimize mix design for ultra-high RAP content asphalt mixtures (50-70%).
- To evaluate the road performance of recycled asphalt mixtures with varying RAP content.
Main Methods
- Fine separation technology for RAP pre-treatment.
- Response Surface Methodology (RSM) for mix design optimization.
- Development of a predictive regression model for Optimal Binder Content (OBC).
- Evaluation of high-temperature rutting resistance and low-temperature cracking performance.
- Generalized sigmoidal model for dynamic modulus master curve construction.
Main Results
- Fine separation significantly reduced RAP variability (asphalt content CV < 5%, aggregate gradation CV < 10%) and minimized false particles.
- Ultra-high RAP mixtures showed improved high-temperature rutting resistance but decreased low-temperature performance.
- A 60% RAP content was identified as optimal, with 70% failing low-temperature cracking requirements.
- The generalized sigmoidal model accurately predicted the viscoelastic behavior of the recycled asphalt mixtures.
Conclusions
- Fine separation is a critical pre-processing step for producing high-quality, sustainable asphalt mixtures with ultra-high RAP content.
- Optimized mix design and performance evaluation are essential for utilizing RAP beyond conventional limits.
- The study provides a pathway for enhanced pavement sustainability through effective RAP recycling.
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