Warranty Project Transforms Rural State Highway

Distress types to be monitored during the five-year warranty include alligator cracking, block cracking, edge raveling, flushing, longitudinal cracking, longitudinal distortion, rutting, surface raveling, transverse cracking, transverse distortion, patching, pothole and slippage. The contract clearly defines the remedial action required to fix any of the distress types that may occur during the warranty period. Warranty work to be performed by Mathy on this project consists of remedial work, elective/preventive maintenance, and the required fourth year crack routing and sealing.

Fairly smooth delivery

According to Andrew Marinelli, P.E., Mathy project manager, work on the highway was executed without any signficant problems. There were some delays earlier in the summer completing the aggregate subbase and waiting for the City of Boscobel to complete sanitary sewer and water main facilities through the project, but Marinelli anticipated that all HMA placements would be completed on schedule. Mathy's Iverson Construction division had 165 days in the contract to place the 70,000 tons of HMA required to construct the new two-lane highway.

"We began working on the project in April by milling off the old asphalt overlay," Marinelli says. "We completed that phase of the project in three weeks, and then we brought in subcontractors to do a scratch grading of the subbase, expanding the existing 12-foot-wide travel lanes to 17-foot-wide lanes (to accommodate a paved shoulder/bicycle lane). The project required some vertical realignment, but no horizontal realignment.

"About the only significant challenge we've faced on this project has been in areas restricted by the protected prairie grass lands," he adds. "We had to install miles of silt fence and we could only push off topsoil so far to avoid encroaching on those designated protected areas. We also hit one silty/sandy area that we had to excavate and rebuild, but otherwise the subbase was in very good condition."

But once Marinelli's paving crew arrived on the project, they picked up the pace by averaging well over 4,000 tons placed per day. They actually set a Wisconsin production record for one portable plant supplying a single paver on August 3, placing 7,643 tons in one day. The crew was equipped with a Terex Cedarapids 452 paver with a Cedarapids material transfer device attached on the front.

That allowed for non-stop paving and eliminated any truck contact with the paver. Compaction was achieved with a Dynapac steel-drum breakdown roller, followed by a Dynapac pneumatic-tired roller and another Dynapac steel-drum roller for finish.

The paving crew was supplied by one of Mathy's portable plants, a Bituma 400-tph (tons per hour) parallel-flow facility, which was set up near the west end of the project.

All other work on the project — striping, grading of the gravel shoulders, landscaping and signage was handled by subcontractors.

With more road agencies awarding more warranty work, contractors like Mathy have more control and flexibility in how they deliver a quality project and road agencies are able to reallocate their resources where needed.

Lowry, who has been with WisDOT for the past 15 years, says he expects to see more future projects awarded as warranty contracts.

"It (warranty contract) allows us (WisDOT) to make better use of our resources," Lowry says. "We can allocate our field technicians to projects where they are needed and let contractors monitor their own work on projects like the Hwy. 133 project we just completed. For two-lane state highways like 133, the warranty approach makes a lot of sense for us and the contractor doing the work."