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Validating the Fatigue Endurance Limit for Hot Mix Asphalt (2010) / Chapter Skim
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Appendix F - NCHRP 9-38 Beam Fatigue Round Robin
Pages 126-127

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From page 126...
... We use the following formula for estimating the target sample weight for compaction: Target Weight = (Target Density − Correction Factor) ÷ 100 × Gmm × Compacted Sample Volume where, Target Density = 93%, Correction Factor = 2.5 accounts for surface voids and the fact that the center of a compacted sample tends to be denser, Gmm = 2.586, Compacted Sample = length x width x height in cm3 = Volume (for us)
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From page 127...
... Log-log plot of strain versus cycles to failure. Lab/Mix PG 64-22 at Optimum PG 64-22 at Optimum Plus PG 76-22 at Optimum NCAT X X X Asphalt Institute X X X University of Illinois X X X VA Transportation Research Council X SEM Materials X University of California X Table 1.
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Key Terms

  • air voids
  • asphalt content
  • endurance limit
  • optimum plus
  • fatigue testing

  • optimum asphalt
  • round robin
  • target density
  • sample preparation
  • content samples

  • compacted sample
  • correction factor
  • dry mass
  • x university
  • materials x

  • following describes
  • plus samples
  • council x
  • test track
  • width x

  • limit using
  • density divided
  • sample density
  • pacted sample
  • initial sample

  • x height
  • plus asphalt
  • precision statement
  • using beam
  • sample weight


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