ACPA Quarter 3 2018

www.acpa.org Quarter 3, 2018 9 » continued from page 6 sweeping curve in the northern section of the road was not compliant with the current design speed, so INDOT agreed to have Primco adjust the outer edges of the 4.5 in. concrete overlay for proper superelevations. The outer edges of the superelevations in the curves were as thick as 10.5 in. in some areas to bring the road eleva- tion into compliance with INDOT standards, says Baumer. Lessons learned during the project included the importance of communication with residents and community members who travel in the areas of construction, Hoy says. “INDOT and the contractor did a good job making sure the closures were communicated and that residents had access to their property,” he says, adding there were also other things learned from this project. “We also needed to have plenty of ag- gregate on hand for temporary driveways and temporary passing lanes.” Finishing details also presented a challenge that require careful attention to detail, Taylor says. Because the southern section of the project is considered a rural road, corrugations (rumble strips) were required along the center and edge lines to enhance driver safety. Unlike traditional concrete with 16 ft joint spac- ing, the thin concrete overlay’s transverse joints occurred every 6 ft, says Taylor. “Since this was the first thin concrete overlay project in our area, the frequent joint cuts were not considered upfront,” he says. “Instead of a continuous grind, the contractor had to grind in smaller sections to avoid grinding within 1 ft of the joint.” Pavement was placed between September 9 and October 26, 2017, then prepared for final detail- ing. The road was fully opened to traffic in late November. “The road is greatly improved. It rides well and the correction of the cross-slopes and superel- evation improves the safety of the road as well,” says Taylor. “We are looking forward to seeing how it performs over time and what type of maintenance is required. We are hoping that thin concrete overlay will be the way to fix the many rural roads that have been covered with asphalt for years.” Unlike traditional concrete with 16 ft joint spacing, the thin concrete overlay’s transverse joints occurred every 6 ft. T H I N C O N C R E T E O V E R L A Y