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DSR-Based Test Procedures and Specification Guidelines for Grading PG 58-XX and PG 64S-XX Asphalt Binders in Kansas
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    Final Report July 2017–September 2019
  • Abstract:
    This report addresses a shortcoming of the Multiple Stress Creep Recovery (MSCR) test method and specification system for virgin PG 58-XX and blends of PG 58-XX with reclaimed asphalt pavement (RAP) binders. The MSCR specification system limits the non-recoverable compliance, Jnr, to less than 4.5 kPa-1 for standard S-graded binders and disregards binders that do not satisfy this criterion. Also, the MSCR specification does not consider virgin binder grade adjustments when RAP is used. These binders, which are often blended with high percentages of RAP, have positively resulted in mostly a 64 ℃ high-temperature grade according to LTPPBind, with 98% reliability against rutting in Kansas. This research blended PG 58-28 and PG 58-34 virgin binders with four RAP binders and conducted MSCR tests to investigate this issue. Results showed that the high-temperature grade of PG 58-XX binders increased to 64 ℃ when they were mixed with RAP binder percentages of 15% or more. Furthermore, MSCR test results showed that the addition of RAP binder decreased the Jnr value to the S criteria when the requirement of Jnr difference percentage was omitted. Results also showed that the RAP binder can be screened using the rotational viscosity test to ensure the blends of PG 58-XX and RAP binders result in high-temperature grade adjustments and satisfy the S grade. A comprehensive set of PG 58-XX, PG 64S-XX, and multiple RAP binders used in Kansas should be tested to develop sound specification criteria based on PG and MSCR grading specifications.
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