Flexible overlays for rigid pavements : final report, February 2010.
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2010-02-01
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Edition:Final report; 1/2006-8/2009.
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Abstract:Approximately 45% of the New Jersey Department of Transportation’s (NJDOT) roadways are
composite (hot mix asphalt overlying Portland cement concrete). Hot mix asphalt (HMA) is used as
the overlying material because of its inexpensive nature when compared to most PCC
rehabilitation/reconstruction alternatives. In addition to being economical, HMA also allows faster
repairs resulting in shorter construction duration and lower “User” delay costs. However, due to the
majority of the PCC pavements being in average to poor condition, many HMA overlays are exposed
to extreme movements (both vertical and horizontal). The combination of associated load and
environmentally induced movements creates complex stresses and strains in the vicinity of expansion
joints and cracks in the PCC, thus dramatically reducing the life of the HMA overlay, typically in the
form of reflective cracking. It should be noted that there currently does not exist an AASHTO
accepted pavement design method for the pavement design of composite pavements.
A research project was undertaken to evaluate how the NJDOT can optimize the use of hot mix
asphalt overlays when rehabilitating PCC/composite pavements. Field test sections were evaluated
and instrumented to measure the PCC joint movements and pavement specific traffic conditions.
Asphalt mixtures placed on the test sections were sampled and evaluated under laboratory tests that
model field movements and conditions. The collected field and laboratory data, as well as collected
Literature Review information and National Survey information, provided valuable information used to
develop an asphalt mixture design and selection procedure for the NJDOT. The procedure was able
to predict the early (only 2 years of service life was available for comparison) reflective cracking, as
determined by the percent of PCC joints cracked, to within 9% of the measured values.
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