Better Roads Digital Magazine
Issue link: https://read.dmtmag.com/i/94328
HighwayContractor By Daniel C. Brown, Contributing Editor Manatts ran this paver at about 28 feet per minute, which helped produce a smooth ride on the pavement. smoothness and density just right Getting A n Iowa-based contractor has won 80 percent of the available bonus payments on a successful 18-mile, two-lane asphalt paving project near Grinnell, Iowa. The Iowa Department of Transportation award- ed Manatts Inc., Newton, a total of approximately $300,000 in incentives for smoothness and density on the State Highway146 project. Preliminary construction on the project began last March and was substantially complete in September. The existing roadway was a deteriorated, full-depth asphalt pavement that averaged 11.5 inches thick. The fi rst step in rehabilitating the pavement was cold-in-place recycling (CIR) to a depth of 4 inches, says Jeff Steinkamp, project manager for Manatts. The recycling process, by WK Construction, a subcontractor from Middleton, Wis., consisted of milling and rejuvenating the pavement, then laying the material back down in a windrow. Using a windrow pickup machine and asphalt paver, the subcontractor completed the cold recycling. Manatts' paving work began with widening the 24-foot-wide cold-recycled roadway. With a Wirtgen milling machine working 2 feet wide, the contractor cut a 6-inch-deep trench on each side of the pavement. Next, Manatts followed up with a Weiler Widener W-30 to place two lifts of asphalt into the trench and widen the road to 28 feet. The widening required 12,400 tons of hot-mix asphalt. When that was compacted, the road was ready for the 3-inch overlay. To place the fi rst 1.5-inch intermediate lift, Manatts ran a Roadtec RP-195 tracked asphalt paver at a speed of about 28 feet per minute. Running the paver at this Better Roads November 2012 5