Laboratory Evaluation on Residue in Castor Oil Production as Rejuvenator for Aged Paving Asphalt Binder

In this study, residue in castor oil production is evaluated as a rejuvenator for aged paving asphalt binder. Different contents of the bio-based rejuvenator, ranging from 0% to 50%, were added to PAV aged binder to prepare samples. DSR tests and BBR tests were carried out to characterize rheological properties of rejuvenated binder. Furthermore, continuous PG grading temperatures were determined from DSR and BBR test data. Test results and data analyses show a notable decrease in complex modulus and an increase in phase angle with increasing rejuvenator content, indicating restoration in viscoelastic properties of the binder. The binder with 30% rejuvenator reaches a level similar to original binder in rutting parameter. The binder with 20% rejuvenator reaches a level similar to original binder in control thermal cracking parameter. The grading temperatures show that all the upper, lower, and intermediate grading temperatures decrease with increasing rejuvenator content, indicating a negative effect on rutting resistance, and positive effects on thermal and fatigue cracking resistances of the binder. The serviceability temperature shows that the gaining in low temperature behavior is more significant than the loss in high temperature behavior, indicating an improving effect of the rejuvenator on temperature susceptibility of the rejuvenated binder.

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  • English

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  • Accession Number: 01690254
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 21 2018 3:28PM