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Abstract:Asphalt overlays are one of the most common tools for rehabilitating existing asphalt and concrete pavements.
However, the performance of new overlays is often jeopardized by the cracking distress in the existing
pavement. This existing cracking propagates, or reflects, through the new overlay to the surface of the new
overlay. The rate at which this reflection cracking propagates to the surface is a function of overlay thickness,
crack severity, traffic loading and subgrade or subbase support. Once reflection cracks appear on the surface
of the new pavement, water and debris can enter the subbase and subgrade which can affect pavement strength
and reduce the life of the overlay. Therefore, reducing the rate at which these reflection cracks propagate to
the surface of the pavement is desirable in order to lengthen the time between rehabilitation projects or crack
sealing operations.
Various methods have been used in past decades in an attempt to reduce the rate of reflection crack
propagation. These include geosynthetic membranes and asphalt stress absorbing interlayers.
This study compares performance of a grid reinforcing system, a polymer modified asphalt-rich interlayer
system and control pavement test sections.
After five years of performance monitoring differences between the attenuation systems and the controls have
appeared.
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