A section of portland cement concrete (PCC) pavement on Interstate 5 near Tacoma was the site of an experimental installation of the URETEK® Method of undersealing and the URETEK® Process called Stitch-In-Time for restoring load transfer to PCC pavements. After six years, the average load transfer efficiency of the 15 movable Stitch-In-Time joints, called accumulator joints, is 38 percent. In contrast, the average load transfer efficiency of the dowel bar retrofit joints installed at the same time is 82 percent.
The URETEK undersealing method is doing an excellent job of supporting all of the panels in the experimental section. However, there is considerable cracking and spalling in the locked joints that are located between accumulator joints indicating areas of high stress concentration.
The Stitch-In-Time Process is not recommended as a viable method to restore load transfer in PCC pavements.
Washington State Department of Transportation, Materials Laboratory
Portland cement concrete, Undersealing, Structural analysis, Load transfer, Experiments, Dowels (Fasteners), Pavement joints, Pavements.