The Project
MN 169 is located in South central Minnesota, near the town of Blue Earth. The 5,120-foot section that was applied on October 4 was part of a larger, 6.5-mile long project.
Before the application began, Rodney Honeycutt (the field engineer from Asphalt Materials) reviewed the J-Band checklist with crew leaders. This application was scheduled to be applied at 18” wide at a rate of 0.90 lb./ft. The application rate was low due to the fineness of the surface course mix.
J-Band was applied to an existing Type B NovaChip mix. The temperature of the material was 270°F at application and 130°F in just three minutes. Traffic can typically cross J-Band at this temperature without tracking.
Paving began later the same day. The surface course was paved with a 9.5 mm fine-graded mix. Before compaction began, Rodney reviewed ideal roller operations for handling a pavement treated with J-Band with the roller operators. The final depth after compaction was 1.75.”
The Results
While no shadowing was observed on this job, J-Band was directly measured to migrate ¾” up into the mix. The total migration height after compaction is between 50-75% of the overlay height and will can be measured directly from core samples. This means that the pavement at the joint is now protected against the intrusion of air and water. The J-Band team will collect data on this project over the years to document how well J-Band withstands Minnesota conditions.
Location: Faribault County, MN
Date: October 4, 2018
Road Type: Rural state road
Project Length: 5,120 feet
AADT: MISSING
Prime Contractor: Ulland Brothers
J-Band Applicator: Road Fabrics, Inc.
J-Band Supplier: Asphalt Materials, Inc.
J-Band Field Engineer: Rodney Honeycutt
Photos
