Development of Mechanistic-Empirical Structural Design Program for Hot-Mix Asphalt Overlaid Rubblized Portland Cement Concrete Pavements

In Iowa, most surfaced highway pavements are of Portland Cement Concrete (PCC) type. These pavements deteriorate over time due to distresses caused by a combination of traffic loads and weather conditions. The most commonly used rehabilitation technique for deteriorated PCC pavements is to overlay it with Hot Mix Asphalt (HMA). However, the performance of HMA overlaid PCC pavements is hindered due to the occurrence of reflection cracking, resulting in significant reduction of pavement serviceability. Reflective cracking is minimized by reducing the slab action using various fractured slab techniques including rubblization, crack and seat, and break and seat. Among all the fractured slab techniques, rubblization of PCC is considered to be the most effective approach. Currently, the HMA overlay thickness design methodology used in the state of Iowa is purely empirical. A study was undertaken to develop a Mechanistic-Empirical (M-E) design procedure for HMA overlay thickness design for rubblized PCC pavements. The objective of this paper is to discuss the different stages involved in the development of the design system. In this design procedure, failure criteria such as the tensile strain at the bottom of HMA layer and the vertical compressive strain on top of subgrade are used to consider HMA fatigue and subgrade rutting, respectively. The mechanistic component of the design system was validated using field results from an instrumented trial section in Polk County, Iowa. Finally, the developed M-E design system was implemented in a Visual Basic computer program with a user-friendly interface.


  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 24p
  • Monograph Title: TRB 85th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01024868
  • Record Type: Publication
  • Report/Paper Numbers: 06-2221
  • Files: BTRIS, TRIS, TRB
  • Created Date: May 31 2006 7:55AM