Dedicated to providing knowledge, the Pavement Research Center uses innovative
research and sound engineering
principles to improve pavement structures, materials, and technologies.

NEWS (Previous News Items)

  • A new study to assess the performance of permeable interlocking concrete pavers in pavement applications has recently been initiated at the UCPRC facility at UC Davis on behalf of the Interlocking Concrete Pavement Institute Foundation for Education and Research. Construction of a two-lane, 30m long test track using this technology was completed in late January 2014. HVS testing is scheduled to start on the track in early February. Posted 2/6/2014.
  • The two Caltrans/UCPRC Heavy Vehicle Simulators have completed testing of four different full-depth pavement reclamation strategies on one of the instrumented test tracks at the UC Davis pavement research facility. These strategies include pulverization with no stabilizer (FDR-NS), with cement (FDR-PC), with foamed asphalt/cement (FDR-FA), and with engineered emulsion (FDR-EE). Data analysis and preparation of the project report continues. A second round of HVS testing to assess the sections in a soaked state is currently being discussed with Caltrans. Posted 1/6/2014.
  • The International Symposium on Pavement LCA will be held in Davis, California, on October 14-16, 2014. The deadline for paper submission has been extended to April 10, 2014. Information and registration are available here. Posted 11/27/2013.

Winter and Spring 2014 UCPRC Activities

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Candidate for fully permeable shoulder retrofit validation site

Inertial Profiler Certification Center. Inertial Profilers (IPs) measure the longitudinal profiles of wheelpaths, and the resulting profiles are typically used to calculate the pavement’s International Roughness Index (IRI). For the past twenty years, IP equipment has commonly been used to collect network-level IRI data for pavement management systems. On July 15, 2013, the California Department of Transportation (Caltrans) introduced specifications for project-level measurement of as-built smoothness in terms of IRI on construction projects using calibrated IP equipment. In order to ensure the accuracy of this IP-collected data, the equipment must be periodically checked at controlled sites.

Previously, having California IP equipment certified required a trip of approximately 1,800 miles to College Station, Texas, the location of the nearest certification center. However, in order to facilitate equipment checks for Caltrans and other IP operators in western states, the UCPRC assisted Caltrans with recommendations for the set up and operation of a new Caltrans Sacramento IP certification site, a Caltrans standard equipment certification process based on comparisons of measured profiles, and a process for operator certification. The project also included set up of the new site, which opened in late July 2013, and through October 2013 a total of 17 operators and 9 profilers had been certified. For more information click here.

Images on the right depict the six steps required for IP operator certification and also show the location of the Center’s new Sacramento-area site.


Important Note for Caltrans Users: Prior to scheduling pavement preservation (preventive maintenance or CAPM) or roadway rehabilitation work on flexible pavement highway sections, the District Materials Engineer and/or the Project Manager should review this spreadsheet to ensure that the proposed project does not include sections active in the “Quieter Pavement Research” (QPR) testing program. If the proposed project is within a QPR test section, please contact Linus Motumah of the Caltrans Office of Pavement Design before scheduling the work.

To view maps that show where the sections are located, click the following link: http://maps.google.com/maps?q=http://www.ucprc.ucdavis.edu/qpsectionsmap.kmz (or copy-and-paste it into a new browser window for a slightly larger view).

For more information, contact John Harvey of the UCPRC or Linus Motumah.