Towanda Barnes Road is located on the east side of Bloomington/Normal Illinois. It consists of four lanes with a bi-directional center turn lane. This project included a 2” milling and resurfacing with a ½” level binder and ½” of HMA Surface Course mix D N70.

Upon arriving on the job, Tim Zahrn, the AMI field support engineer, reviewed the J-Band checklist with the prime contractor and agency representatives.

J-Band was applied at 18” wide between the binder course and the surface curse with a target rate of 1.47 lb./ft. All four joints were treated with J-Band on this road. J-Band cooled from 300°F to 174°F in just five minutes.

Tim Zahrn, the field support engineer on this job, noted that this application was done very consistently by the Illiana crew. After paving the surface course, J-Band was seen the migrate up to ¾” into the overlay height. The total migration height after compaction is between 50-75% of the overlay height and will can be measured directly from core samples.

The area above the J-Band was soft and spongy. Shadowing in this area was also seen. This soft texture and visible shadowing are both telltale signs of J-Band migration. This means that J-Band was performing as expected and the joint is now protected from the intrusion of air and water.