The technical summaries used for the course reflect the current practice
in design, construction, contracting methods, and quality control
and assurance procedures.
The target audience for the course includes
Federal, State, and local government employees; college and university
faculty; and consultant engineers. An undergraduate degree in geology,
engineering geology, or civil engineering, or equivalent engineering
experience in the highway/transportation field, is desired.
For more information on the course, contact Silas Nichols at the
FHWA Resource Center, 410-962-2460 (email: silas.nichols@fhwa.dot.gov),
or Larry Jones at NHI, 703-235-0523 (larry.jones@fhwa.dot.gov).
Information is also available online at www.nhi.fhwa.dot.gov.
Best Practices for Ultra-thin (UTW) and Thin Whitetoppings (TWT)
will be the focus of an International Conference to be held April
12-15, 2005, in Denver, Colorado. The conference will review progress
made in whitetopping technologies since 1992 and help identify best
practices for selecting candidate projects and designing, constructing,
and repairing UTWs and TWTs. The event is sponsored by FHWA, the Colorado
Department of Transportation, American Concrete Pavement Association,
Transportation Research Board, and the International Society for Concrete
Pavements.
Whitetopping is the resurfacing of an existing distressed asphalt
pavement with concrete. While conventional whitetopping is a well
established practice, UTW and TWT techniques only came into use in
the United States in the 1990s. These techniques involve thinner concrete
resurfacing and different jointing patterns. UTW has a concrete surface
thickness ranging from 50 to 100 mm (2 to 4 in), and TWT has a concrete
surface thickness of 100 to 150 mm (4 to 6 in).
Conference sessions will focus on implementable design and construction
techniques that result in long-lasting UTW and TWT. The conference
is targeted at pavement engineering and construction professionals
who are involved in various aspects of pavement design, construction,
testing and evaluation, and rehabilitation. This includes Federal,
State, and municipal engineers; consulting engineers; contractors;
materials suppliers; and members of academia.
For more information about the conference, contact Shiraz Tayabji
at Construction Technology Laboratories, Inc., 410-997-0400 (fax:
410-997-8480; email: stayabji@ctlgroup.com).
A 5-year contract was awarded in September 2004 to Cornell University
to begin work on National Pooled Fund Study TPF-5(039), "Falling
Weight Deflectometer (FWD) Calibration Center and Operational Improvements."
The study was initiated in 2002 to address issues related to aging
equipment at the four Long-Term Pavement Performance (LTPP) program
regional FWD calibration centers. Currently, 15 States have pledged
$565,000 through 2007 for the study, with additional commitments and
participation still encouraged.
|
| These photos show whitetopping in Spartanburg County,
SC (above), and on I-55 in Carroll County, MS (below) |
|
The project scope includes not only updating computer hardware, software,
and data acquisition equipment, but also modifying the current FWD
calibration procedure to reduce calibration time. The first 2 years
of thecontract will focus on making the initial necessary improvements.
During the remaining 3 years, additional work desired by State participants
may be addressed, such as establishing additional calibration facilities
and providing technical support for all of the calibration centers.
For more information, visit www.pooledfund.org
(search under TPF-5(039)), or contact Mike Moravec at FHWA, 410-962-5623
(email: mike.moravec@fhwa.dot.gov),
or Eric Weaver at FHWA, 202-493-3153 (email: eric.weaver@fhwa.dot.gov).
The climate data module of the LTPP Pavement Performance Database
has been updated with climate data from the LTPP test sections
from 1997-2002. The module contains weather statistics and
indices for each test section at 899 project sites, estimated from
nearby weather stations. The data sources are the National Climatic
Data Center for test sections in the United States and the Canadian
Climatic Center for Canadian test sections. As the performance of
a pavement is directly affected by its environment, of which climate
is a large part, knowing climatic conditions and trends for a particular
area is very important in making pavement design, maintenance, and
rehabilitation decisions.
The LTPP data is available online at www.datapave.com.
The next LTPP climatic data update is expected in 2008. More information
about the procedures used for climatic data updates and the structures
and elements of the climatic data module can be found in LTPP
Climatic Database Revision and Expansion (Publication No. FHWA-RD-00-133)
and Long-Term Pavement Performance, Information Management System:
Pavement Performance Database User Reference Guide (Publication
No. FHWA-RD-03-088). The climatic database publication is available
online at www.tfhrc.gov/pavement/ltpp/pdf/00133.pdf.
The database user reference guide is available at www.tfhrc.gov/pavement/ltpp/reports/03088/index.htm.
For more information or to obtain printed copies of the reports, contact
Eric Weaver at FHWA, 202-493-3153 (email: eric.weaver@fhwa.dot.gov).
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