Ruggedness Investigation of the 3-Point Bending Cylinder (3PBC) Test for Fatigue Characterization of Asphalt Mixtures

Fatigue cracking is one of the critical distress modes in asphalt pavements. Naturally, laboratory testing methods for fatigue characterization are time-consuming and require sophisticated procedures. In an effort to improve the speed and quality of the information gained from laboratory fatigue tests, a new testing approach, known as the Three-Point Bending Cylinder (3PBC) test, was recently introduced. This new approach included an analysis approach based on the Timoshenko Beam Theory along with the viscoelastic continuum damage (VECD) theory to model the mechanical response of asphalt specimens. In this study, the results of a ruggedness study for the 3PBC test are presented. The factors selected for ruggedness analysis included specimen diameter, span length and air void content. The results showed that the VECD theory successfully applied to all the selected geometries. The C-S curves were used to obtain the Nf value of each selected combination. Based on the selected levels for each factor, specimen diameter was found to significantly affect the 3PBC test results and fatigue performance values. Specimen span length and air void content, however, did not appear to have a considerable effect on the fatigue life of the mixture. Certainly, the proposed methodology possesses great potential to significantly reduce the testing cost and substantially increase the testing speed. Nevertheless, enhancements including modifications of the VECD formulations to capture the diameter effects on the fatigue life of asphalt mixtures followed by an inter-laboratory study are needed.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: 19p

Subject/Index Terms

Filing Info

  • Accession Number: 01763599
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-00361
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:06AM