Cost effective prevention of reflective cracking of composite pavement : research project capsule.
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Cost effective prevention of reflective cracking of composite pavement : research project capsule.

Filetype[PDF-186.09 KB]


English
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  • Creators:
    Elseifi, M.
  • Corporate Creators:
    Louisiana Transportation Research Center
  • Corporate Contributors:
  • Subject/TRT Terms:
  • Publication/ Report Number:
    08-1P
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Louisiana
  • Edition:
    Research project capsule; Dec. 2008.
  • Corporate Publisher:
    Louisiana Transportation Research Center
  • Abstract:
    Reflection cracks are caused by discontinuities (cracks or joints) in underlying layers, which

    propagate through a hot-mix asphalt (HMA) overlay due to continuous movement at the crack

    prompted by thermal and traffic loading. If the new overlay is bonded to the distressed layer,

    cracks in the existing pavement usually propagate to the surface within one to five years and

    even as early as few months have been reported. Excessive seasonal temperature variations

    and movements of a cement-treated base layer may also result in shrinkage cracking, which

    extends to the pavement surface to cause reflection block cracks. Reflection cracking leads to

    premature failure of overlays by allowing water infiltration through the cracks, which cause

    stripping in HMA layers and weakening and deterioration of the base and/or subgrade.

    Since the early 1930s, considerable resources and efforts have been spent to find new and

    relatively inexpensive techniques to delay reflection cracking. Different methods, including the

    use of interlayer systems (e.g., glassgrid, stress absorbing membranes, paving fabrics, etc.)

    and rubblization, have been suggested for enhancing pavement resistance to reflective

    cracking. Experimental investigations of these crack control treatments indicate that their

    performances have been mixed and cannot be considered conclusive.

    Louisiana has experience with various techniques and treatments to control reflection

    cracking since the 1970s; however, the cost-effectiveness and performance of these methods

    have not been reliably evaluated. In addition, scientific evaluation and testing of these

    treatment methods was not performed on many projects. To ensure successful control of this

    distress and effective allocation of maintenance funds, there is a critical need to assess the

    performance of pavement sections across the state built with various treatment methods and

    to determine the most cost-effective techniques to delay or to prevent reflection cracking in

    composite pavements.

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