pugmill unit on the rear of the B unit. Because Highway 141 had received
On Highway 141 the Paveover recycling train used two preheaters on the existing asphalt.
picks up the asphalt from the A unit, heats the milled surface again and mills off 1 more inch. So now we have milled off a total of 2 inches." The B unit can also receive virgin hot mix. On the
Highway 141 project, Ray estimates that Paveover added an average of about 30 percent virgin asphalt to the to- tal recycled material. The recycled asphalt plus the virgin material, plus any rejuvenator needed, go to a twin-shaft
chip seals, that asphalt mixed in well with the recycled material and pre- cluded the need for a rejuvenator. Ray says that a contributing fac- tor to the project's award was the smoothness that Paveover and Mays/ United achieved. At a minimum, a section of pavement must have a Half-Car Roughness Index (HRI) of 65 inches per mile to receive a smoothness bonus. For an HRI of less than 45, a contractor can win the maximum bonus.
On Highway 141, the contractors received the maxi-
mum bonus on many one-tenth-mile segments. And the team averaged 61 inches per mile on the southbound side and 62 on the northbound side. The total of bonuses awarded was $28,000, Ray says. "You have to look at what process gives you the best
life cycle cost," says Lee Smith. "And on this project, ev- eryone agrees that we got it right."
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Write 177 on Reader Service Card or visit www.betterroads.com/info Better Roads July 2012 31
