Evaluating Torsional Recovery Test for Interlinkage with Deformation-Recovery Measurement Metrics of Polymer Modified Bitumen

Strategic Insights -

Researchers at Islamic University of Technology (IUT) have conducted a study to evaluate the effectiveness of torsional recovery (TR) test in correlating with established methods for polymer modified bitumen (PMB) quality assessment. The study involved testing 15 PMBs prepared with five types of styrene-butadiene-styrene (SBS) and one base bitumen. The results showed strong linear relationships between TR and established methods, with linear regression R2 values exceeding 0.85 in many cases.

Key Takeaways:

  • The study aimed to evaluate the effectiveness of torsional recovery (TR) test in correlating with established methods for polymer modified bitumen (PMB) quality assessment.
  • The study involved testing 15 PMBs prepared with five types of styrene-butadiene-styrene (SBS) and one base bitumen.
  • The results showed strong linear relationships between TR and established methods, with linear regression R2 values exceeding 0.85 in many cases.
  • TR and elastic recovery-based ductilometer (ER-DB) exhibited R2 more than 0.90, especially within SBS-type specific cases, while global correlation was found to be 0.76.
  • TR results showed good global correlation with dynamic modulus values and associated parameters with R2 0.8.
  • The study concluded that TR can be reliably used for preliminary quantification of SBS-dosage with R2 of 0.88.

Statistics:

  • 15 PMBs were tested in the study.
  • 5 types of styrene-butadiene-styrene (SBS) and 1 base bitumen were used in the study.
  • Linear regression R2 values exceeding 0.85 were observed in many cases.
  • R2 values more than 0.90 were observed for TR and ER-DB in SBS-type specific cases.
  • Global correlation between TR and dynamic modulus values was 0.8.
  • TR results showed good global correlation with dynamic modulus values and associated parameters.

Sources:

  • NewsRx. Researchers at Islamic University of Technology (IUT) Zero in on Cleaner Materials Research (Evaluating Torsional Recovery test for interlinkage with deformation-recovery measurement metrics of polymer modified bitumen). Ecology, Environment & Conservation. June 13, 2025; p 1531.
  • Evaluating Torsional Recovery test for interlinkage with deformation-recovery measurement metrics of polymer modified bitumen. Cleaner Materials, 2025, 16():100309. (DOI: 10.1016/j.clema.2025.100309)