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Concrete Pavement Technology Update
Highlights of CPTP Expert Task Group Meetings
CPTP's Executive Expert Task Group (ETG) held its first meeting in Washington, DC, on August 26, 2004. The membership, including a full spectrum of stakeholder representatives, provides guidance concerning CPTP-related needs of transportation agencies and industry and on product implementation strategies.
FHWA representatives King Gee, Paul Teng, Tommy Beatty, and Sam Tyson welcomed the group with brief overviews of the ETG's anticipated role in CPTP implementation. Some emphasis areas are the new mechanistic-empirical pavement design guide, guidelines for portland cement concrete pavement repair and rehabilitation, and new equipment for characterizing concrete quality. Implementation plans will target customer needs. The group recommended using a "tailored technology transfer" approach to meeting customer needs, including these methods:
The Executive ETG's second meeting, on June 1, 2005, in Atlanta, included discussions of CPTP products, their benefits to agencies, plans for marketing and demonstrations, and review of the CPTP long-term research and development plan for concrete pavements (see "Concrete Pavement R&D Road Map Moves Toward Implementation").
The Engineering ETG focuses on CPTP technology transfer, marketing, and communications. The group has met twice since the August 2004 Update was published. In Chicago, on November 18, 2004, an ambitious agenda included a report on the evaluation of whitetopping design software and a complete update of CPTP activities. In addition, Executive ETG Chairman Joseph Deneault gave an overview of that group's August meeting. The Engineering ETG reached consensus on continuing the technical review of the whitetopping design software and concrete curing guidelines, and proposed expanding the Update mailing list.
The group met in Denver on April 12, 2005. The agenda addressed CPTP presentations and workshops as well as completed and ongoing projects. Member-moderated discussions were held on agency and industry needs and CPTP's role in meeting those needs (moderated by David Huft and David Howard) and on CPTP products and implementation issues (moderated by Ahmad Ardani).
The group encouraged early publication of reports on the dowel bar scanning technology, the TEMP (Total Environmental Management for Paving), and concrete curing guidelines; the development of concise summaries on completed CPTP products; and early interaction of the CPTP with AASHTO pavement and materials groups.
International Conference on Best Practices for Ultrathin and Thin Whitetoppings
The April 2005 UTW/TW best practices conference attracted participants from six countries—Canada, France, Guatemala, Japan, Korea, and 26 States across the U.S.A. Attendees included Federal and State DOT officials, contractors, materials suppliers, consultants, equipment manufacturers, and other industry professionals.
The program consisted of presentations and discussions on new developments related to UTW and TWT technologies and lessons learned over the last decade in the use of these technologies. Implementable design and construction techniques that result in long-lasting UTW and TWT were the focus. Ahmad Ardani, Colorado DOT, commented that the conference was a "one-stop shop for everything you wanted to know about whitetopping. The speakers brought practical information that can be put to work." Topics included fatigue analysis, pavement evaluation, reflective cracking, joint spacing, high-performance concrete, and heavy loading. The conference proceedings should be of special interest to city, county, and State DOT engineers and related professionals who are using or contemplating the use of UTW and TWT.
According to Colin Franco, who presented the Rhode Island DOT's experience with intersection overlays, the conference confirmed that whitetopping is a good solution in places where asphalt under heavy loading and environmental considerations are concerns. "Those of us from State highway agencies are pretty much all in the same boat," said Franco, "convinced that white-topping is a good technique and ready for the next steps."
CPTP Task 65 has developed a best practices workshop on whitetopping that incorporates the findings from this conference (see "Long-Lasting Pavements: Best Practices Workshops and Presentations for Highway Agencies"). Related information is available in NCHRP Synthesis 338, Thin and Ultra-Thin Whitetopping—A Synthesis of Highway Practice.
For details on the new whitetopping workshop or the conference proceedings, contact Shiraz Tayabji (firstname.lastname@example.org).