Located in the Canadian province of Manitoba, Provincial Trunk Highway (PTH) 9 is a 53-mile-long provincial highway that runs from Winnipeg to Gimli. It is known as Main Street between Winnipeg and Selkirk. The 32-year-old concrete pavement required rehabilitation on a 2-mile section, due to transverse joint deterioration and uneven wear of the existing seal coat causing a rough ride. Having considered complete reconstruction and a bituminous overlay as options, Manitoba Infrastructure and Transportation (MIT) chose to perform Concrete Pavement Preservation (CPP) as a more cost-effective treatment method.
This project involved CPP in the form of diamond grinding, full- and partial-depth joint repairs, and resurfacing of the bituminous shoulders on the four-lane wide section of road. Prior to performing the rehabilitation, an unsuccessful attempt was made to remove the existing seal coat. It was determined that the seal coat could only be removed during the final diamond grinding operation, which was included as one of the rehabilitation treatments to improve the ride of the rehabilitated concrete. Prior to grinding, the average International Roughness Index (IRI) of the northbound travel lanes was 3.95 while the southbound lanes measured at 4.32, which was caused primarily by the deteriorated transverse joints and uneven wear of the seal coat. At the completion of the concrete rehabilitation, the IRI was recorded at 2.13 northbound and 1.83 southbound, resulting in a smoothness improvement of 46 percent and 58 percent respectively.
“We anticipate that this treatment will last 15 to 20 years, which would be similar to the bituminous overlay but less costly,” says Josh Plett, P. Eng., senior project engineer, MIT.
The total project value was $2,600,000, which was a cost savings compared to a bituminous overlay at $4,500,000 or total reconstruction at $12,800,000. The project was completed in October 2011.