Potential applications of paving fabrics to reduce reflective cracking.
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2005-02-01
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Edition:Final report; Feb. 2004-Feb. 2005.
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Abstract:Asphalt concrete overlay on the existing pavement is often used as a cost-saving
surface treatment for deteriorating pavements. A major problem encountered with asphalt
resurfacing is the phenomenon termed reflective cracking, the propagation of existing
cracks from old or existing pavement into the new overlay. Reflective cracking is one of
the most significant factors in pavement deterioration. It is caused by shear and tensile
stresses in the asphalt layer induced by traffic loads, change in temperature, expansive
subgrade soils, moisture changes, existing cracks, and joint and crack movements in the
underlying pavement.
In this project, the available literature on the applications and effectiveness of
stress-relieving interlayers, known as paving fabrics, to reduce reflective cracking is
synthesized. Basic functions of paving fabrics, fabric specifications, mechanism, long-term
performance, life cycles and cost effectiveness, factors influencing performance, recent
innovations, and lessons learned from installation are discussed. In addition, a survey of
the current paving fabric applications in the State of Mississippi was conducted to
determine the various practices and performances of the paving fabric systems to reduce
reflective cracking. The field performance of overlays using fabric interlayers has
generally been successful, although there have been cases where the paving fabric systems
provided little or no improvements. In particular, paving fabrics may not reduce cracking
significantly with thin overlays. A summary of current practices as well as possible
directions for future research is reported.
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