Investigation and development of a non-destructive system to evaluate critical properties of asphalt pavements during the compaction process.

Details

• Creators:
  Schmitt, Robert L. ; Faheem, Ahmed ; Al-Qadi, Imad L.
• Corporate Creators:
  University of Wisconsin--Platteville. Department of Civil and Environmental Engineering ; University of Illinois at Urbana-Champaign. Department of Civil and Environmental Engineering
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Asphalt pavements
  • Compaction
  • Nondestructive tests
  • Thermogravimetric analysis
  • Ground penetrating radar
  • Seismometers
  • Nuclear density gages
  • Evaluation and assessment
  • Field studies
• Publication/ Report Number:
  0092-11-01
• Resource Type:
  Tech Report
• Geographical Coverage:
  Wisconsin
• Corporate Publisher:
  Wisconsin. Dept. of Transportation. Research and Library Unit ; Wisconsin Highway Research Program
• Abstract:
  The purpose of this report is to present findings from a two-stage investigation to develop a non-destructive system to ; evaluate critical properties and characteristics of asphalt pavements during the compaction process. The first stage aligned ; critical properties and characteristics with available non-destructive testing (NDT) technologies. A quantitative ranking was ; created with an objective and unbiased scoring system to determine the most appropriate NDTs for field evaluation. Based ; upon this ranking system, the three higher-ranked NDTs for the evaluation and selected for a field evaluation were: Infrared ; Thermography (IR), Ground Penetrating Radar (GPR), and Portable Seismic Pavement Analyzer (PSPA). The nuclear ; density gauge was also used in the evaluation. ; The second stage of the investigation collected field data from three projects, analyzed the data using a variety of methods, ; and developed an implementation plan based upon the findings. Continuous infrared (IR) thermal readings measured mat ; temperature at 12 transverse offsets spaced 13 in apart, and at a 1 ft longitudinal spacing. Analysis of the data found greater ; variability along centerline of the paving mat. The average nuclear density on the three projects was nearly identical, ; ranging from 92.4% to 92.6%, and standard deviations of 2.21%, 1.66%, and 1.40%. The GPR density standard deviation ; was about half that of nuclear density. GPR thickness among the projects had a standard deviation ranging from 0.1 to 0.2 ; inches. Variability closer to the pavement centerline was generally higher. Average modulus normalized at 130°F on ; Project 1 was 3616 ksi, Project 2 at 3014 ksi, and Project 3 at 2530 ksi. ; Data from the three projects found no definitive relationship between continuous thermal temperatures behind the paver and ; final density measured by GPR and nuclear density gauge. Placement temperature did not appear to affect modulus; this ; finding is limited to the three projects in this study and may not be true for all mixes placed in Wisconsin or other states.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/26998/dot_26998_DS1.pdf
• File Type:
  [PDF - 9.42 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:c57ef9743050404c620f53635f7fa1cece37843c237394d733e13556ccbd9ec19b91670aceeb7e97d365cf21b7ca737e8068ec8164b39e4e420b7d69e8c60437