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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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I: Comparison of Laboratory and Backcalculated Resilient Moduli
Pages 435-440

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From page 436...
... Both laboratory tests and backcalculation procedures from field data have important advantages and also important limitations. Important problems with resilient modulus measurement in the laboratory include fabricating specimens to duplicate field conditions and then simulating during testing the field stress states and environmental factors such as temperature and water content.
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From page 437...
... Summary -- The limited results of this study suggest it may be desirable to use a resilient modulus backcalculation procedure, such as Option ~ of the Texas Transportation Institute method. Since the Option ~ type backcalculation methoc!
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From page 438...
... Section 1 Section 7 AC Surface Course 2.0 2.0 AC Binder Course I.5 I.5 AC Base Course N/A 5.5 Aggregate Base Course 12.0 N/A Total AC Layer 3.5 , .
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From page 439...
... CEstimatec} from the pavement temperatures by considering the position of the mid-point of the individual specimens in the pavement Table I-3 Comparison of the laboratory-determ . ined versus backcalculated moduli values l Section | Mix | SurfaceC | Ma (ksi)
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Key Terms

  • resilient modulus
  • heavy duty
  • laboratory resilient
  • fixed analysis
  • transportation institute

  • texas transportation
  • test sections
  • proposed laboratory
  • backcalculation procedure
  • surface deflections

  • backcalculated moduli
  • duty surface
  • using option
  • siler city
  • modulus based

  • layer moduli
  • determined using
  • backcalculation procedures
  • moduli values
  • duty binder

  • user selects
  • backcalculatecl values
  • field data
  • evaluating structural
  • stress states

  • stiffness versus
  • resulting surface
  • preconditioning level
  • field conditions
  • modulus measurement


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