Better Roads Digital Magazine
Issue link: https://read.dmtmag.com/i/85927
HighwayContractor COLD B Taking out the cracks ack in the mid-'90s some road managers would pre- scribe sawing and sealing joints in asphalt pavements, in similar fashion to concrete pave- ments. It didn't work out very well, as the Minnesota Department of Transportation (MnDOT) found on Highway 59 in Stevens County. "The theory was that if they sawed and sealed joints in the bituminous pavement, it would control the crack- ing," says Brad Cegla, an MnDOT construction engineer. "But because of the sawing and sealing on Highway 59, those joints faulted over the years. You got a bumpy pavement." To repair a 13-mile stretch of the two-lane road, MnDOT required mill- ing to a depth of 1.5 inches, cold-in- place recycling to a depth of 3 inches, and two lifts of hot-mix overlays, each 1.5-inch thick. The initial mill- ing assured the state that the height of the fi nal roadway would only rise 1.5 inches above the original grade – an important factor to keep crossings and entrances close to the existing height. Cegla says the state chose cold re- cycling because it would take out the faulted joints and prevent refl ective cracking later on. "The thinking was to break up that refl ective cracking from below, and provide a recycled layer between the original pavement and our new overlay," says Cegla. Anderson Brothers Construction of Brainerd, Minn., won a $3.5 million contract with MnDOT to rehabilitate the road. After the initial milling, a subcontractor, Midstate Reclamation of Lakeville, Minn., swung into action with its cold-in-place recycling train. IT'S LIKE YOU'RE THERE Bergkamp's new InPave™ System allows you to map, monitor and evaluate pothole patching performance. Maximize road quality and budget use no matter where you are. Phone: (785) 825-1375 • Email: sales@bergkampinc.com • www.bergkampinc.com Pothole Patchers • Slurry Seal & Micro Surfacing Pavers • Spreader Boxes APWA Booth 911 Write 170 on Reader Service Card or visit www.betterroads.com/info 16 August 2012 Better Roads Untitled-1 1 7/23/12 1:55 PM