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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;
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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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