Variance Index and Repeatability Limit of Damage Characteristic Curve using Resampling Method

The simplified viscoelastic continuum damage model (S-VECD) has been widely accepted as a tool to predict fatigue performance of asphalt concrete. One key component in the model is the damage characteristic curve that results from a cyclic fatigue test. This curve characterizes the relationship between the material integrity (stiffness) and the level of damage in the material. As with any experimental measurement, it is important to know and quantify the variability of the damage curve, but traditional statistical methods are ill-suited for experiments that yield functional data as opposed to univariate data. In this study, a variance index of the damage characteristic curve is first proposed and compared with the expert judgement of the variance of a set of 9 different asphalt mixtures. Then an example analysis for establishing the repeatability limit of a specific mixture as the application of the variance index is presented using the resampling method and hypothesis test. The major findings are: (1) the proposed variance index can match expert judgement of variability; (2) the shape of the damage characteristic curve can affect the performance of the variance index; (3) the resampling method and hypothesis test can be applied to flag inconsistent data in multi-user or multi-laboratory results; and (4) the resampling method can also be used to construct repeatability limit of the variance index.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 25p

Subject/Index Terms

Filing Info

  • Accession Number: 01763641
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-03242
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:07AM