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NEWS (Previous News Items)

  • The UCPRC will be sampling and testing throughout California on state highways and on a few construction projects. The objective is to build up the material library for use with Caltrans' mechanistic empirical design method (CalME). We are evaluating the in-situ stiffness of various materials, including cement treated base, lean concrete base, cold in place recycled material, and full depth recycled materials with or without stabilizing agents. Several rounds of testing will be conducted to capture the effects of seasonal variation, curing/aging, and trafficking on layer stiffness. Please remember to drive slow for the cone zone, and move away a lane if possible. We appreciate it. Posted 6/15/2015.
  • In April, the Caltrans/UCPRC-operated Inertial Profiler Certification Center completed its second 2015 session of operator and profiler exams. These sessions are conducted as part of an effort to support Caltrans' implementation of IRI-based smoothness specifications in the state. Coordinating its efforts with Caltrans at the Sacramento certification site, the UCPRC certified 22 operators and 11 profiler vehicles, the largest number of each certified in any session to date. More information about this program and its services are available here, including details on the next scheduled certification date in June 2015. Posted 6/15/2015.
  • The Caltrans/UCPRC Heavy Vehicle Simulators are currently testing different full-depth pavement reclamation strategies on one of the instrumented test tracks at the UC Davis research facility. The strategies include pulverization with no stabilizer (FDR-NS), pulverization with cement (FDR-PC), pulverization with foamed asphalt/cement (FDR-FA), and pulverization with engineered emulsion (FDR-EE). Testing is currently taking place under soaked conditions on the FDR-NS test section with 120mm asphalt surfacing and under high pavement temperatures in dry condition on the FDR-FA test section. HVS testing on this project is scheduled to end at the end of June 2015. Posted 5/18/2015.
  • A presentation was made at the California Asphalt Pavement Association (CalAPA) conference in Ontario on April 16th by John Harvey. The presentation included a look at the 2000 pavement research vision document and a review of progress towards its 15 year goals, a look at ahead at some expected major future research challenges, an overview of the current Caltrans/UCPRC Pavement Research Roadmap projects related to asphalt pavement, and a summary of the Asphalt Concrete Long Life (AC Long Life) long-life rehabilitation strategy that Caltrans District 8 is contemplating using on an upcoming segment of damaged freeway. Posted 4/21/2015.
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Spring 2015 UCPRC Activities


Candidate for fully permeable shoulder retrofit validation site

Pavement Sustainability. The Federal Highway Administration (FHWA) has been supporting the dissemination of pavement LCA knowledge and development of pavement LCA guidelines since 2010 through their Sustainable Pavements program. The FHWA has recently published a Towards Sustainable Pavement Systems: A Reference Document, which is a review of pavement systems and best practices for improving their sustainability, and is organized around a life cycle perspective. It also includes an overview of pavement LCA and economic and social sustainability considerations.

The reference document is available at:

The FHWA has also published two technical briefs; one provides an overview of pavement sustainability, while the other summarizes Life Cycle Assessment (LCA) as applied to pavements.

The UCPRC was a member of the team that wrote the Reference Document and edited it in consultation with the asphalt and concrete pavement industries. The FHWA team will be presenting webinars on the material in the Reference Document between May and September, 2015. The team is also preparing additional technical briefs on practices to improve the sustainability of concrete and asphalt pavements, and guidelines for pavement LCA.

Tech Briefs are available at:

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: (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.