Uncontrolled concrete bridge parapet cracking.
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2013-06-01
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Abstract:The Ohio Department of Transportation has recently identified the problem of wide-spread premature cracking of concrete bridge
parapets throughout its District 12 region (Northeast Ohio). Many of the bridge decks that contain these prematurely cracked
parapets are of relatively recent construction. In severe cases, replacement of the parapet may be required before replacement of
the bridge deck itself. This incurs a sunk cost upon the bridge owner, as the parapets will again be replaced during the regularly
scheduled replacement of the bridge deck. In a recent instance, the replacement of a cracked parapet (without replacing the deck)
cost District 12 approximately $140,000. In addition, parapet walls are a crucial safety feature of roadway bridge construction,
and severe deterioration of these barriers could introduce a significant safety hazard.
Premature cracking of concrete bridge parapets is a potentially complex problem, with a number of possible causes. The
objective of this study was to determine the reasons for uncontrolled concrete bridge parapet cracking, and to provide
recommendations to ODOT to prevent such cracking in the future. Potential factors examined in this study included: properties
of the concrete mixtures used, construction methods, joint details, composite structural action, and durability of the concrete and
reinforcement. Identifying the cause of, and avoiding this problem in the future, has several benefits, including: a potential cost
savings for the district, increasing the safety of these structures in future construction, and increasing the overall understanding of
the durability of these structures.
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