In the current study the effect of various recycling agents on the thixotropic behaviour of rejuvenated binders is explored. Thixotropy is indicative of the shear history of the asphalt binder, its effectiveness in characterizing the rejuvenated binders is investigated. The structural kinetic model is used to study thixotropy of rejuvenated binders using 8 mm dynamic shear rheometer (DSR) measurements. It is seen that the viscoelastic effects from the purview of thixotropy provides qualitative data, which can aid in selection of recycling agents for rejuvenation. As per the healing coefficients of the rejuvenated binders, the ranking of the recycling agent would be Prefalt, 650/900, Sylvaroad, V1500 and Nygen in descending order. In case of breaking coefficient, it would be Prefalt, 650/900, Sylvaroad, V1500 and Nygen. However, incorporation of these effects in the viscoelastic model needs more research for estimation of binder performance.

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Unveiling the Dynamics of Thixotropic Behaviour in Rejuvenated Asphalt Binders

  • Anish Kumar,
  • Abhishek Savarnya,
  • Sanjeev Sinha,
  • Sameer Sen

摘要

In the current study the effect of various recycling agents on the thixotropic behaviour of rejuvenated binders is explored. Thixotropy is indicative of the shear history of the asphalt binder, its effectiveness in characterizing the rejuvenated binders is investigated. The structural kinetic model is used to study thixotropy of rejuvenated binders using 8 mm dynamic shear rheometer (DSR) measurements. It is seen that the viscoelastic effects from the purview of thixotropy provides qualitative data, which can aid in selection of recycling agents for rejuvenation. As per the healing coefficients of the rejuvenated binders, the ranking of the recycling agent would be Prefalt, 650/900, Sylvaroad, V1500 and Nygen in descending order. In case of breaking coefficient, it would be Prefalt, 650/900, Sylvaroad, V1500 and Nygen. However, incorporation of these effects in the viscoelastic model needs more research for estimation of binder performance.