(Silver Award) State Highway 51, Blaine County, Canton, Okla.
Contractor: Duit Construction Co., Inc.
Owner/Engineer: Oklahoma DOT
The Oklahoma DOT originally designed this project as a 3 in. asphalt overlay to resurface this 5.52 mile section. It was bid twice, but because of asphalt oil prices and limited bidders, it appeared asphalt pavement was not a good choice for the project.
The Oklahoma DOT flipped the project to concrete overlay, and when they did so, they received four bids instead of the one they received when the job was specified asphalt pavement. With the new 5 in. concrete using the existing milled asphalt base, the pavement could prove to have a 50 year life.
Duit Construction* faced many challenges with this bonded concrete overlay project. Strict placement specifications required the milled asphalt surface to be dry before placing the concrete. This limited the amount of moisture used in the milling operation and made timing critical to achieve the correct moisture for the bond.
Surface temperature and concrete strength specifications during the summer were hurdles had to overcome when placing the 98,485 SY of concrete with 39,700 lbs of fiber to be completed.
Daily summertime temperatures of 94 degrees and higher on the milled asphalt put the concrete paving operation out of placement specification range. Also, the project had a 45 minute daytime limit for placement of concrete, and because of these factors, the concrete paving had to be done at night.
Duit Construction was able to use a trimmer capable of milling/trimming at least 1 in. of asphalt on a single, 16 ft. pass. By performing the trimming/milling during the day and concrete paving at night, the concrete paving was completed in 20 days for the 29,136 linear ft of two lane highway.
To help with access during construction, Duit set up a paving plan that determined which business driveways could be closed and which ones could remain open.
The contractor also determined the section roads or intersections to detour traffic around the work zone. By doing so, Duit was able to determine limits for traffic restrictions and make the paving as seamless as possible.
Thanks to planning, communications, and persistence this 5.52 miles of roadway was completed about 90 days from the time of bid to final construction.
(Gold Award) State Highway 13 Resurfacing Project, Moffat County, Colo.
Contractor: Castle Rock Construction Company
Owner: Colorado DOT – Region 3
Engineer: Colorado DOT – Region 3– Craig Residency
Castle Rock Construction Co. (CRCC)* was responsible for constructing the 6 in. concrete overlay on State Highway 13 north of Craig, Colo. The project was originally let as concrete or asphalt alternate, but during the bidding process, concrete pavement was determined to be the most economical material.
This area of the state traditionally uses only asphalt, but the project allowed the concrete pavement industry to break into the secondary road market, which had been impossible previously.
Because concrete was the first-cost low selection without any life cycle cost adjustment ($650,000) confirms project owners can afford the long-lasting benefits of concrete paving.
To produce the concrete for this job, CRCC mined and processed 47,000 tons of rock and sand. The company’s concrete batch plant provided the concrete for all 131,000 SY of concrete overlay. The existing asphalt surface was roto-milled to smooth both the profile and cross slope prior to paving. The milled asphalt was then placed as road base material for shouldering.
Pilot car traffic control was used to facilitate the half width paving approach. This system operated without major incident and only caused minor delays to traffic.
During excavation, the contractor had to clean out of a ditch and culvert pipes to create better flow and prevent the ditch and neighboring land from flooding. After the work was done, CRCC placed riprap to keep the slopes from eroding in the future.
This project serves as proof that concrete overlays can be and are competitive with the asphalt industry, both financially and in pavement smoothness. CRCC and the Colorado DOT worked partnered together on decision-making and other aspects of the project.
This project will also serve as an example in future promotional efforts throughout the state. State Highway 13, which boasts a high quality, exceptionally smooth concrete overlay, will serve the people of northwest Colorado and the traveling public for decades to come.
* ACPA Member.