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Low Temperature Performance Evaluation of Modified Asphalt Binders

Jahanbakhsh, Hamid | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45287 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Tabatabaei, Nader
  7. Abstract:
  8. Low temperature cracking is the most important type of asphalt pavement distress that occurs in cold climates. Up until the development of performance grading (PG) based binder specification, there was no irect indication of low temperature suitability of asphalt binders. PG specification was mainly developed for and validated by neat binders.
    With increased use of modified asphalt binders in recent years, some of the limitations and shortcomings of the original PG specifications have surfaced.Considering that low temperature cracking is a fracture failure, it was hypothesized that tests based on the fracture mechanics and fracture energy parameter can lead to better classification of low temperature properties of modified asphalt binders.In this research, low temperature performance of modified asphalt binder with SBS, PPA, and CRM were evaluated using direct tension test (DTT) and semi-circular bending (SCB). Tests were used to characterize the low temperature properties of modified binders and their results were compared with the Bending Beam Rheometer (BBR) test results and PG low temperature specifications.Results showed that DTT and SCB tests can be used to describe the low temperature performance of various modified asphalt binders. SCB test showed more consistent results with available field data without the difficulties of conducting DTT tests. It was shown that by using Sulfur as a crosslinking agent not only improves the high temperature storage stability of SBS modified asphalt binder, it ecreases the required amount of SBS by about 50% to yield a comparable result
  9. Keywords:
  10. Modified Bitumen ; Low Temperature Cracking ; Direct Tension Test ; Superpave Method ; Crosslinking Agent ; High Temperature Storage Stability ; Bending Beam Rheometer ; Semi Circular Bend

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