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See more I-5 construction photos on FlickrTraffic backs up for nearly thirty minutes during a weekend closure on southbound I-5 near N.E 205th Street. Drivers, check the Seattle traffic map to see where traffic is building before you go.Crews pouring concrete panels on southbound I-5 near I-90 during the first weekend of the I-5 Seattle to Shoreline Pavement Repair project.Tining the new concrete on southbound I-5 at I-90 during the first weekend of the I-5 Seattle to Shoreline Pavement Repair project. Tining improves skid resistance. See more I-5 construction photos on Flickr.The weekend of February 13-15, crews replaced 41 concrete panels on southbound I-5 between Stewart Street and I-90. After new concrete panels are poured, they are covered with insulating tarps and left to cure for 18 hours.Close up view of freshly ground pavement on the left. The grinding process removes about a half inch off of the pavement surface to provide a smoother ride with enhanced friction. See more I-5 construction photos on Flickr.Crews pouring and finishing a new concrete panel in south Seattle near Corson Avenue S. We use rapid set concrete to replace panels overnight. Rapid set concrete hardens within a couple of hours. A view of the front end of the pavement grinding machine on southbound I-5 in downtown Seattle on Feb. 24, 2009. The grinding machine features diamond-tipped circular blades that are stacked together on a roller that cuts a four-foot wide section of pavement.The back end of a pavement grinder on southbound I-5 in downtown Seattle on Feb. 24, 2009. See more I-5 construction photos on Flickr.The pavement on I-5 in King County is more than 40 years old, twice its planned design life. Crews will replace deteriorating concrete panels in both directions and in the express lanes. Heavy truck traffic has resulted in extensive cracking.Crews will also repave the NE 50th St. on-ramp to southbound I-5.