Varied Specimen Geometry for Simplified VECD Test with Rest Period: Verification of a Small Specimen Size

The viscoelastic continuum damage (VECD) theory and relevant methods are main tools for interpretation of asphalt mixture’s fatigue and damage behavior, while asphalt mixture performance tester (AMPT) is the current standardized facility used for VECD characterization test. This paper focuses on AMPT specimens’ geometry effect on VECD tests and the resultant damage characteristic curves, with rest period after each load cycle. The research contains a series of specifically designed dynamic modulus tests and simplified VECD tests on three different sample geometries. The results have firstly agreed with existing finding that, in comparison to standard sizes, small specimen can produce reasonably accurate dynamic modulus master curves as well as relevant VECD parameters. The VECD tests are conducted with continuous loading and with 0.3s rest period after each load cycle, both under different temperatures (12 and 20oC) and 11 strain amplitudes. Remarkably, at both temperatures, a reduced size specimen is able to produce reasonably accurate damage characteristic curves with rest period after each load cycle, also to generate precise original damage curves (without rest period). Else, the small size specimen demonstrates high likelihood of control led failure location within the measuring range. The results increases confidence of using reduced specimen size for VECD and rest period healing research by AMPT, with benefit of saving significant experimental time and material consumption.

  • Supplemental Notes:
    • This paper was sponsored by TRB committee AFK50 Standing Committee on Structural Requirements of Asphalt Mixtures.
  • Corporate Authors:

    Transportation Research Board

    ,    
  • Authors:
    • Su, Yang
    • Asadi, Hossein
    • Nikraz, Hamid
  • Conference:
  • Date: 2019

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: 16p

Subject/Index Terms

Filing Info

  • Accession Number: 01697372
  • Record Type: Publication
  • Report/Paper Numbers: 19-04297
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 7 2018 9:25AM