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Effectiveness of two reflection crack attenuation techniques.
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Filetype[PDF-827.67 KB]

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  • Corporate Creators:
    Colorado State University
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  • Corporate Publisher:
    Colorado. Dept. of Transportation. Applied Research and Innovation Branch
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  • Description:
    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


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