Evaluation of terminal blend rubberized asphalt incorporating high crumb rubber content
Currently there has been a trend of increasing the rubber content in rubberized asphalt due to the obvious environmental and decarbonizing benefits of this technology. Terminal Blend Rubberized Asphalt (TBRA) appears to be a feasible approach to safely increase the waste rubber content within the as...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-07-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509525000841 |
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| Summary: | Currently there has been a trend of increasing the rubber content in rubberized asphalt due to the obvious environmental and decarbonizing benefits of this technology. Terminal Blend Rubberized Asphalt (TBRA) appears to be a feasible approach to safely increase the waste rubber content within the asphalt binder. This study attempts to discuss the feasibility of highly-dosed TBRA and conduct a comprehensive evaluation on this modified asphalt. To do so, TBRA of different rubber contents (30%, 40%, 50%) are produced. To achieve high desulfurization and thermal degradation of the CR particles, enhancing the stability and processability of the TBRA samples, higher preparation temperatures (220°C) and extended shearing times (6 hours) were employed. The study assesses how these production conditions affect the asphalt's microstructure, chemical composition, and viscoelastic properties, using fluorescence microscopy, ATR-FTIR, and rheology master curves for analysis. Results show that the terminal blending process leads to CR particle breakdown and rubber molecule depolymerization, enhancing workability and stability up to a rubber dosage limit of approximately 40 %. However, while TBRA shows excellent low-temperature performance and fatigue resistance, its high-temperature properties are moderate, suggesting further modifications with materials like SBS or rock asphalt could enhance its performance. |
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| ISSN: | 2214-5095 |