Mn/ROAD Case Study Using CalBack and CalME

This paper demonstrates the applicability of using CalBack and CalME in predicting in-situ pavement performance of the Minnesota Road Research Project (Mn/ROAD) case study. The benefits of using CalBack to backcalculate the layer moduli chronically from deflection data are manifold to evaluate the influence of freeze/thaw and seasonal changes of subgrade, the confining effect of aggregate base, and the hardening/aging effect of asphalt concrete. The comprehensive Mn/ROAD database provides necessary inputs to run CalME simulations, including data from falling weight deflectometer, traffic, environment, condition survey, and material testing. Two mainline cells (Cell 3 and Cell 21) of flexible pavements were selected because of material availability for developing material response/performance models for CalME simulation and because of their contrasting pavement performances in fatigue cracking and rutting. The simulation results indicate that the presumed bottom-up fatigue cracking results from CalME match reasonably well with the recognized top-down cracking condition survey results for all the cells. The question of whether or not there is top-down fatigue cracking remains moot. The CalME was able to predict rutting performance of cell 3 appropriately; however, the rutting performance of cell 21 was completely out of prediction which the possible over-asphalting during construction might contribute to the premature rutting failure. The use of CalBack and CalME seems to be very promising and capable of predicting pavement performance in a rational way.


  • English

Media Info

  • Media Type: DVD
  • Features: Figures; References; Tables;
  • Pagination: 23p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01157677
  • Record Type: Publication
  • Report/Paper Numbers: 10-3373
  • Files: TRIS, TRB
  • Created Date: Jan 25 2010 11:42AM