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NCHRP Web Doc 14 Laboratory Determination of Resilient Modulus for Flexible Pavement Design Final Report (1997) / Chapter Skim
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F: Effect of Laboratory Testing Variability on Pavement Thickness
Pages 387-396

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From page 388...
... of the resilient modulus due to testing errors is considered reasonable to use in a reliability analysis when a single specimen is tested in a production oriented laboratory: Material Asphalt Concrete Unstabilized Base Subgrade Coefficient of Variation (CV 0.10 0.15 0.15 Laboratory experimental errors, as defined for this study, include sample preparation, sample alignment, and instrumentation measurement errors. As discussed subsequently, these coefficients of variation can be readily combined with the values used in the AASHTO reliability analysis.
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From page 389...
... MONTE CARLO RELIABILITY ANALYSIS The Monte Cario method of simulation was used, in addition to the AASHTO reliability approach, to investigate the effect of laboratory testing variability on required pavement thickness. The Monte CarIo method involves determining, for a given set of mean design parameters, a large number of structural thickness designs considering the likely random variation in design parameters.
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From page 390...
... SIR · "0,~ pal BASE SIR ~ SS,000 pal SUBGRADE SIR ' ~ "l APSI .
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From page 391...
... Lack of equation fit to the observed AASHO Road Test performance was by far the most important factor contributing to the combined value of SO. All variables randomly varied in the Monte CarIo simulation had a normal probability distribution except for the IS hip single axle loadings (ESALs)
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From page 392...
... ANALYSIS OF PAVEMENT SECTIONS Monte CarIo and 1986 AASHTO Guide type reliability analyses were performed on both full depth asphalt concrete sections and sections having thick unstabilized aggregate bases. Unless otherwise indicated, the mean value of the variables used in the analyses were as follows: (~)
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From page 393...
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From page 396...
... c · D ._ oo L
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Key Terms

  • aashto guide
  • monte cario
  • pavement thickness
  • probability distribution
  • reliability analysis

  • asphalt concrete
  • modulus testing
  • testing variability
  • testing error
  • laboratory testing

  • aasho road
  • weighted value
  • aashto reliability
  • aggregate base
  • required pavement

  • cario simulation
  • variability due
  • combined value
  • cario method
  • determined using

  • design parameters
  • road test
  • design equation
  • variation due
  • normal probability

  • laboratory experimental
  • randomly selected
  • depth asphalt
  • test performance
  • base thickness


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