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Evaluation of new binders using newly developed fracture energy test.
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Filetype[PDF-2.90 MB]

  • Publication/ Report Number:
    BDK75 977-75
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  • Abstract:
    This study evaluated a total of seven asphalt binders with various additives

    using the newly developed binder fracture energy test. The researchers prepared and

    tested PAV-aged and RTFO-plus-PAV-aged specimens. This study confirmed previous

    research findings that fracture energy is unaffected by loading rates. This research

    outlines the characteristics of true stress-true strain curves for asphalt binders with

    various additives. The results indicate that SBS polymer-modified asphalt binder

    exhibits a true stress-true strain curve with a distinct second stress peak at all loading

    rates, and has high fracture energy. Four binders exhibited comparable fracture energy

    with and without RTFO testing, while the fracture energy of other three increased

    significantly after RTFO testing. Limited information is available regarding the

    additives in the tested binders and their relative contents; however, the BFE test appears

    to clearly identify the presence of SBS polymer modifier and rank the cracking

    resistance of tested binders in terms of fracture energy. The BFE test successfully

    identified three binders which failed to meet the Superpave PG 76-22 grading

    requirements and clearly distinguished between the remaining four qualified binders.

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