Since 1950, concrete pavements in California have been constructed without dowel bars in the transverse joints, Consequently, aggregate interlock has been the primary mechanism for load transfer across adjacent slabs. As the pavements age, the aggregate lock is diminished and load transfer decreases, leading to pavement distress. Load transfer restoration is a rehabilitation strategy for increasing the load transfer capability and extending the service life of concrete pavements. The most common technique for restoration is dowel bar retrofit (DBR) which involves the installation of dowel bars across the transverse joints or cracks of existing pavement. To evaluate the effectiveness of DBR, a test site on Route 80 near Colfax in Placer County was constructed in October 1998. Another test site was constructed on Route 101 near Ukiah in Mendocino County in January 2001. These sites were chosen primarily because the pavement exhibited low load transfer across transverse joints. This report evaluates the DBR performance at each site. 17 Figures, 2 tables, 26 p.
A dowel bar retrofit project on Interstate 405 near Irvine in Orange County began to exhibit sights of failure in the bond between the existing concre...
The project Resident Engineer requested that the Office of Rigid Pavement Materials and Structural Concrete examine cracking in replacement slabs and ...
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United States Department of Transportation
[PDF-7.49 MB]
