Laboratory testing of precast paving notch system.
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Laboratory testing of precast paving notch system.

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  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;
  • Abstract:
    Bridge approach pavement settlement and the resulting formation of ‘bumps’ at the end

    of bridges is a recurring problem on a number of Iowa bridges. One of the contributing

    factors in this settlement is failure of the bridge paving notch. A paving notch (also

    known as a corbel or a paving support) consists of a horizontal shelf constructed on the

    rear of a bridge abutment and is used to support the adjacent roadway pavement. Over

    time, these paving notches have been observed to deteriorate/fail due to a number of

    conditions including horizontal abutment movement due to seasonal temperature

    changes, loss of backfill materials by erosion, inadequate construction practices,

    foundation soil settlement, heavy traffic loads, salt brine that leaks through the expansion

    joint, and an open expansion joint that tends to fill with dirt and debris and ‘push’ the

    approach pavement off the paving notch. In some cases, the condition of the paving

    notch deterioration may not be noticed until the deterioration reaches a critical state and

    the approach pavement is removed.

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