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Published on: May 31, 2022
Comprehensive Performance Evaluation of Epoxy Reclaimed Asphalt and Mixtures
Junhao Tian1, Dedong Guo1, Qi Xu1
1School of Transportation Civil Engineering, Shandong Jiaotong University, Ji'nan 250357, China.
This study enhanced recycled asphalt pavement (RAP) performance using epoxy recycled binder (ERB) and epoxy recycled mixtures (ERMs). The epoxy system significantly improved rheological properties and road performance, especially fatigue resistance.
Area of Science:
- Materials Science
- Civil Engineering
- Polymer Chemistry
Background:
- Reclaimed asphalt pavement (RAP) utilization is crucial for sustainable construction.
- Improving the performance of recycled asphalt mixtures remains a challenge.
- Epoxy asphalt offers potential for enhancing binder properties.
Purpose of the Study:
- To prepare and evaluate epoxy recycled binder (ERB) and epoxy recycled mixtures (ERMs).
- To investigate the impact of an epoxy system on the rheological and road performance of recycled asphalt.
- To quantify the correlation between epoxy dosage and performance indicators.
Main Methods:
- Preparation of ERB and ERMs with varying epoxy asphalt dosages.
- Rheological analysis of ERB using Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR).
- Road performance testing of ERM including bending, rutting, fatigue, and freeze-thaw resistance.
- Microstructure analysis using Fluorescence Microscopy (FM).
- Grey Relational Analysis (GRA) for correlation analysis.
Main Results:
- Epoxy system addition significantly improved ERB high- (458.3%) and low-temperature (97.9%) properties.
- ERM exhibited enhanced high-temperature (220.4%) and fatigue (80.5%) performance compared to SBS-modified mixtures.
- Dynamic modulus of ERM positively correlated with epoxy system dosage.
- GRA identified fatigue performance as most sensitive to epoxy system dosage.
Conclusions:
- Epoxy asphalt effectively enhances the rheological and road performance of recycled asphalt mixtures.
- The epoxy system offers a viable solution for improving RAP utilization in high-performance asphalt pavements.
- Optimizing epoxy system dosage is key to maximizing fatigue performance in recycled asphalt.
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