Instrumentation and Field Testing of Whitetopping Pavements in Colorado and Revision of the TWT Design Procedure [Interim Report]

Details

• Creators:
  Wu, Chung ; Sheehan, Matthew J.
• Corporate Creators:
  Construction Technology Laboratories, Inc. (CTLGroup)
• Corporate Contributors:
  Colorado. Department of Transportation ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  • Instrumentation
  • Field tests
  • Construction
  • Rehabilitation
  • Performance
  • Asphalt
  • Laboratory tests
  • Whitetopping
• Publication/ Report Number:
  CDOT-DTD-R-2002-3
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Colorado
• Edition:
  Interim Report
• Corporate Publisher:
  Colorado. Department of Transportation
• Description:
  Whitetopping has recently been generating considerable interest and greater acceptance as an approach to asphalt pavement rehabilitation. A number of thin whitetopping (TWT) and ultra-thin-whitetopping (UTW) pavement test sections have been constructed during the past 10 years, and the pavements have demonstrated considerable advantages as a rehabilitation technique. In 1996 the Colorado Department of Transportation (CDOT) sponsored a research project to develop a mechanistic design procedure for TWT pavements.(1, 5) Construction Technology Laboratories, Inc. (CTL) installed the instrumentation, conducted the load testing on the instrumented test sections, performed a theoretical analysis, and developed a TWT design procedure for CDOT. Many variables were considered in the construction of the test sections, including concrete overlay thickness, slab dimension, existing asphalt layer thickness, different asphalt surface preparation techniques, and the use of dowel bars and tie bars. Based on the original design procedure development, there are several observations and conclusions regarding use of TWT pavements for rehabilitation that should be examined more extensively with a supplemental investigation. The items include subgrade support conditions, required thickness of asphalt beneath the concrete layer, and effects of variable joint spacings. New TWT pavement test sections were constructed during 2001 in conjunction with a TWT project constructed by CDOT on SH 121 near Denver, Colorado. This provided an opportunity to instrument and load test additional TWT test sections and use the data to calibrate and verify the existing observations and design procedure. Therefore, the objective of this project is to instrument, load test, and monitor the new and original TWT test section performances to supplement and confirm the results of the 1996 study.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/93408/dot_93408_DS1.pdf
• File Type:
  [PDF - 7.39 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:c94e9b3277e9cda9000f052ffdc15d7f48be482783ec95be28120f76e4f218df4fa1f0107a376f4eac3d881fa2f2f5d3c7c31b2023d7bb08c1ded38a17dac36f