The Open Graded Friction Course (OGFC) asphalt mix is known for its uniform grading, predominantly containing single-sized coarse aggregates with minimal fines. It is typically applied in thin layers (around 20 mm) over impermeable road surfaces. OGFC offers notable advantages in regions with heavy rainfall, enhancing pavement surface infiltration capacity and lateral water drainage due to the underlying surface’s impermeability. However, challenges such as raveling and rutting have impacted the consistency of pavements using OGFC mixes. This study aims to mitigate raveling concerns by incorporating Polymer Modified Binder into OGFC mixes. Crumb Rubber (10, 15, 20 and 25% by weight of bitumen) and Reclaimed Polyethylene (2, 4, 6, 8 and 10% by weight of bitumen) were utilized to modify conventional bitumen. The optimal polymer quantity was determined by comparing draindown and abrasive resistance among OGFC mixes at different binder levels. Rutting susceptibility of both conventional and modified mixes was assessed at the optimum binder content. The findings revealed that OGFC mixes prepared with modified binders exhibited enhanced abrasive resistance compared to those using conventional binder. Specifically, the OGFC mix incorporating 6% reclaimed polyethylene modified binder demonstrated a remarkable 7.5% decrease in abrasion loss compared to the conventional mix. Additionally, it exhibited a 35.2% improvement in rutting susceptibility, surpassing the performance of the 20% crumb rubber modified mix. Consequently, reclaimed polyethylene modified mixes proved more effective in enhancing the rutting resistance of the OGFC layer.

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Enhancing OGFC Performance with Sustainable Modified Binders: Rutting Resistance and Durability Evaluation

  • Sakshi Sharma,
  • Chirag Bhasin,
  • Ankur Sharma,
  • Pardeep Kumar Gupta

摘要

The Open Graded Friction Course (OGFC) asphalt mix is known for its uniform grading, predominantly containing single-sized coarse aggregates with minimal fines. It is typically applied in thin layers (around 20 mm) over impermeable road surfaces. OGFC offers notable advantages in regions with heavy rainfall, enhancing pavement surface infiltration capacity and lateral water drainage due to the underlying surface’s impermeability. However, challenges such as raveling and rutting have impacted the consistency of pavements using OGFC mixes. This study aims to mitigate raveling concerns by incorporating Polymer Modified Binder into OGFC mixes. Crumb Rubber (10, 15, 20 and 25% by weight of bitumen) and Reclaimed Polyethylene (2, 4, 6, 8 and 10% by weight of bitumen) were utilized to modify conventional bitumen. The optimal polymer quantity was determined by comparing draindown and abrasive resistance among OGFC mixes at different binder levels. Rutting susceptibility of both conventional and modified mixes was assessed at the optimum binder content. The findings revealed that OGFC mixes prepared with modified binders exhibited enhanced abrasive resistance compared to those using conventional binder. Specifically, the OGFC mix incorporating 6% reclaimed polyethylene modified binder demonstrated a remarkable 7.5% decrease in abrasion loss compared to the conventional mix. Additionally, it exhibited a 35.2% improvement in rutting susceptibility, surpassing the performance of the 20% crumb rubber modified mix. Consequently, reclaimed polyethylene modified mixes proved more effective in enhancing the rutting resistance of the OGFC layer.