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Validating the Fatigue Endurance Limit for Hot Mix Asphalt (2010) / Chapter Skim
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Appendix C - Proposed Standard Practice for Extrapolating Long-Life Beam Fatigue Tests Using the Ratio of Dissipated Energy Change (RDEC)
Pages 111-115

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From page 111...
... The failure point of low strain tests generally needs to be extrapolated by one of the methods described in this document. Proposed Standard Practice for Extrapolating Long-Life Beam Fatigue Tests Using the Ratio of Dissipated Energy Change (RDEC)
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From page 112...
... 9. Beam Fatigue Test Data 9.1 Test Specimen Fabrication 9.1.1 Prepare test specimens to the target air void content and aging condition in accordance with AASHTO T 321.
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From page 113...
... 10. Data Analysis to Extrapolate Long-life Fatigue Test Using RDEC Beam fatigue tests conducted at low strain levels are unlikely to fail in a reasonable number of cycles.
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From page 114...
... Nf50 = 50% stiffness reduction failure point 10.1.2 PV calculation for low strain testing 10.1.2.1 Plot the DE-LC data and fit the DE-LC curve using the power law relationship. Obtain the f factor of the curve.
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From page 115...
... "Application of Dissipated Energy Concept in Fatigue Endurance Limit Testing" In Transportation Research Record 1929, Transportation Research Board, Washington, DC, 2005, Pp 165-173.
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Key Terms

  • dissipated energy
  • initial stiffness
  • loading cycles
  • fatigue life
  • strain levels

  • fatigue tests
  • energy change
  • low strain
  • fatigue test
  • air void

  • void content
  • flexural bending
  • target air
  • repeated flexural
  • specimen fabrication

  • strain testing
  • law relationship
  • average ratio
  • prediction using
  • using rdec

  • mix asphalt
  • normal strain
  • life prediction
  • power law
  • loading cycle

  • endurance limit
  • tests conducted
  • rdec approach
  • using equation
  • test specimen


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