Relationships Between the Fatigue Properties of Asphalt Binders and the Fatigue Performance of Asphalt Mixtures (2022) / Chapter Skim
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1 Asphalt mixture fatigue response is a complex function of various parameters. As modulus increases, strain capacity decreases, which decreases fatigue life.
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2 Relationships Between the Fatigue Properties of Asphalt Binders and the Fatigue Performance of Asphalt Mixtures pavement applications. The correlation between SDENT extension and binder failure strain is also not as strong as for GRP.
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Summary 3 allow initial estimates of the precision of R-value, ΔTc, and related parameters, which is critical in establishing realistic specification limits. The current laboratory aging method for binder fatigue testing uses RTFOT conditioning followed by PAV aging for 20 hours.
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4 Relationships Between the Fatigue Properties of Asphalt Binders and the Fatigue Performance of Asphalt Mixtures specification should include a maximum value for R or some equivalent control such as a limit on ΔTc. NCHRP 09-59 also found evidence, though not as compelling, that low R-values can result in poor fatigue performance for thick pavements, where the strain is controlled by characteristics of the bound layers.
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Summary 5 4. This proposed maximum value for GRP and range for R-value should be considered tentative.
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