An approximately 2-1/2-mile-long asphalt overlay project on M-50 in Lenawee County was done in July with a paver-placed surface treatment. The $350,000 project involved paving two 11-foot-wide lanes and 8-foot shoulders. Barrett Paving Materials Inc. was the prime contractor on the project. Barrett provided the paving materials. Midland Asphalt Materials, of Tonowanda, N.Y., a sister company to Barrett Paving Materials, was the paving subcontractor on the project.
Only the butt joints on the existing road were milled off prior to the overlay work. Butt joints were milled off 1 inch down at both ends of the project and at a bridge in the middle of the project.
"This paver-placed surface treatment is 3/4-inch thick and it is compacted down to 5/8-inch thick. The paver has a spray bar ahead of the screed that sprays a tack coat that is heavy on polymers, so it's very sticky. So, there is virgin oil on the existing road before the new blacktop hits it. It's a water-based oil, so when the blacktop hits it, it bubbles the oil and the stones get locked into the coat of oil that is on the road," Jonathan Emmick, paving foreman for Midland Asphalt Materials, said.
"Conventional paving operations will have a tack truck and you would have to drive a dump truck and paver through the oil. With our process, the spray bar is on the paver." The paver used on the project was manufactured by Midland Machinery.
The paver-placed surface treatment consists of a stone material with a polymer liquid. Approximately 1,700 tons of paver-placed surface treatment and approximately 13,000 gallons of liquid were placed on the project.
"We're taking out the rutting and the flushing of the old road and make it last a little longer. This will save the state a little money in the long run," Chris Lindahl, paving foreman for Barrett Paving Materials, Inc., said.
"The advantage of this product is that you're using less material to get the same additional lifespan out of the road. Instead of spending millions of dollars to mill and fill, you're spending much less to extend the life of the road the same amount of time. You can extend the life of the road from three to 10 years with this product," Emmick said.
"The process is relatively fast. We can cover a pretty good distance of road in one day. You can put traffic on the road quickly. We're in and out."