Silver Award –DOT 4 ft. Shoulder and Ramp Replacement, Guilford/Randolph County, N.C.
Contractor: Andale Construction*
Owner: North Carolina Department of Transportation
Engineer: NCDOT District 7 RCE
When the North Carolina District 7 Department of Transportation wanted to rehabilitate a 7-mile section of Interstate 85—north and south bound—located between Archdale and High Point, officials selected roller compacted concrete for the 10 ft. outside shoulder.
Because RCC adds a significantly higher structural value to the shoulders, NC DOT also decided to see if the contractor could pave a 4 ft.-wide inside shoulder as well so that the entire roadway would be concrete. A typical RCC section of 4 ft. RCC had never been successfully constructed before the North Carolina project.
Andale Construction modified its high density screed paver and with detailed upfront planning handled the project. The construction time for both of the north and south bound lanes was 16 days from start to finish. The typical section of the 35,887 SY inside shoulder was 6 in. in depth with wider areas placed to meet bridge approaches and slope protections.
In addition to the inside shoulders, Andale also replaced the two concrete exit and entrance ramps at the Archdale #111 exit with broom-finished RCC. The ramps were removed, reconstructed with RCC and reopened in 1O total working days, including demolition of the existing 8 to 11 in. concrete section.
The speed with which the RCC was placed saved NC DOT three months of construction time on the inside shoulder and four months on the ramp replacement. The inside shoulders took 16 total days to remove and replace and the ramps took 10 total days – including curing time.