Influence of Bond Conditions on the Performance of Ultra-Thin Whitetopping (Bonded Concrete Resurfacing)

Ultra-Thin Whitetopping (UTW) is a pavement rehabilitation technique that involves the placement of a thin Portland Cement Concrete (PCC) overlay, 50 mm to 100 mm thick, over a distressed bituminous pavement. Performance of the UTW is dependent on the bond between the two layers. This study evaluated the influence of bond condition on the performance of UTW pavements. Two different test areas were constructed in the Indiana Department of Transportation (INDOT)/Purdue University Accelerated Pavement Testing facility. Each test area had different lanes that varied by concrete mix design, bond preparation, and pavement cross-section. These lanes were subjected to approximately 300,000 load applications. The pavements were instrumented and strains were recorded under loading. Evaluations were performed periodically to monitor distress development. With respect to the interfacial bond conditions, the observed amount of distress generally followed the expected trends. Lanes with a lower degree of bonding (partially bonded or unbonded conditions) typically exhibited higher amounts of distress. Conversely, fully bonded lanes typically showed the lowest degree of distress. The interfacial bond conditions did affect the strain distribution and maximum load induced strains. The measured strains in the bonded lanes matched the theoretical values well. There was some discrepancy between the measured and theoretical unbonded strain distributions. Further analysis into this discrepancy indicated that even in an unbonded condition there was a moderate level of friction between the UTW and Hot Mix Asphalt (HMA) layers. The interfacial bond conditions did have an influence on the estimated radius of relative stiffness as determined by Falling Weight Deflectometer (FWD). The results indicate that the FWD can be used as a method to determine whether or not the UTW was bonded. However, using the FWD to determine the degree of bonding did not provide very good results. The relative values of the radius of relative stiffness matched the trend exhibited by the bond strengths for cores taken from the same lanes.

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  • Supplemental Notes:
    • Abstract reprinted with permission from the International Society for Concrete Pavements.
  • Corporate Authors:

    International Society for Concrete Pavements

    6305 Oyster Bay Court
    Bridgeville, Pennsylvania  United States  15017
  • Authors:
    • Newbolds, Scott A
    • Olek, Jan
  • Conference:
  • Publication Date: 2008

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: CD-ROM; Figures; References; Tables;
  • Pagination: pp 878-893
  • Monograph Title: 9th International Conference on Concrete Pavements: The Golden Gate to Tomorrow's Concrete Pavements

Subject/Index Terms

Filing Info

  • Accession Number: 01494781
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 23 2013 11:16AM