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Characterization of Warm Mix Asphalt Containing Reclaimed Asphalt Binders

Safazadeh, Faramarz | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43998 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Tabatabaei, Nader
  7. Abstract:
  8. Utilization of RAP in HMA reduces the initial costs, conserves natural sources and avoids disposal problems. Aged binder from RAP will have some effects on resultant binder. To date, solvent extraction and recovery is the only method that physically separates the RAP binder from the RAP aggregate for characterization. Time consuming for recovery, altering the physical properties of the recovered asphalt binder like binder hardening and the possibility that Asphalt binder is not completely extracted from the aggregate are the weak points of this method. Addressing the need for non-solvent based RAP binder characterization; procedures for low temperature characterization of RAP binder properties using mix designs and back calculation of binder properties were developed. Low and intermediate temperature properties of RAP binder using mix designs is compared to properties of artificially aged binders. Virgin binder is aged in PAV to make artificial RAP binder. Comparison between physical parameters of RAP binder and binder aged in PAV is done and it’s concluded that about 37 hours is quite enough for stimulating the aging of RAP binder and making artificially aged binder. Results of this study on artificial RAP show that utilizing softer binder as the virgin binder increases the allowable percentage of RAP binder for about 8 percent. Investigation on low shear viscosity and workability of mixtures containing RAP binder shows that adding 2 percent Sasobit reduces the compaction temperature for about 20˚C
  9. Keywords:
  10. Recycling ; Reclaimed Asphalt Pavement (RAP) ; Mastic ; Binder Recovery ; Warm Mix Asphalt (WMA)

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