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Germans tour Arizona A-R pavements
German officials join the
list of hundreds of visitors to the
10-year-old SHRP test section on I-40 in northern Arizona, where the
Asphalt-Rubber sections have outlasted all other rehabilitation
strategies. Several Asphalt-Rubber projects are planned in Germany with
Advanced Recycling Sciences, Inc., an RPA member planning a tire
processing operation there.
Above, from
left: Dip.-Ing. Gerhard Kroker, Ministerium
fur Winschalt und Angeleganheiten der Europaischen, Meckenurg,
Vorpommern; George Way, ADOT pavement design engineer; Dip.-Ing. Thomas
Taschenbrecker, Baudirektor- Amsleiter, StuBenbauamnt-Scherin; Wilhelm
Burke, state secretary, Ministry of Economics, Mecklenburg, Vorpommern;
Prof.-Dr.-Ing. Klaus-Werner Damm, Asphalt-Labor Testing Laboratory,
Wahltedt; Ehrenfried Liebich, chairman, Advanced Recycling Sciences,
Tustin, CA.
Above: Dr. Julie Nodes,
ADOT, shows lan facilities to
Dip.-Ing Taschenbrecker and Prof. Damm.
RPA
research at TRB
The RPA sponsored research “Development of
Mechanistic-Empirical based Overlay Design Method for Reflective
Cracking,” will be presented Tuesday, January 15 in the session
sponsored by the TRB Committee on Pavement Rehabilitation from 3:45 in
the Shoreham Hotel. The authors are Dr. Jorge Sousa, Rachid Saim, and
Richard Stubstad, Consulpav International; Dr. Jorge Pais, University
of Minho, Portugal and George Way, Pavement Design Engineer, Arizona
Dept. of Transportation.
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Caltrans on fast
track to performance
based specification
At an October 22 meeting of the Rubberized Asphalt
Concrete Task Group (RACTG), Phil Stolarski, deputy division chief,
Engineering Services, Materials Engineering and Testing Services,
announced a performance based specification will be developed by
November 19 and used on five pilot projects representing
various climate and traffic loadings throughout the state in the 2002
construction season.
The specification will include the following: smoothness
requirement, friction course requirement (Open Graded Asphalt
Concrete), five year warranty against rutting,
bleeding, cracking, potholing and delaminating, repairs/emergency.
The specifications structural section rehabilitation
requirements will assume that
the half-thickness criteria are applicable for all rubberized products
and all products must
contain a minimum of 15% rubber.
Caltrans will conduct a five year post construction
evaluation of the projects. The purpose of the evaluation study is to
build Crumb Rubber Modified pavements under a five year performance
warranty. Caltrans is also considering warranties on future
microsurfacing and chipseal projects as a way to build and maintain
better longer lasting roadways.
The industry chair of the RACTG, Jeffrey Reed, said
“Asphalt-Rubber can easily exceed the five year warranty, while meeting
all the other goals of these projects. Caltrans’ history with using
Asphalt-Rubber has been excellent as demonstrated by the threefold
increase in it’s usage over the last three years. We, the industry,
look forward to working with Caltrans on these projects.”
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