ForConstructionPros.com

The section of the road selected for study in this county measured 4.1 miles in length, 20 feet in width with minimal shoulders, and had a ¼-inch cross-slope consisting of an asphalt surface with thickness ranging from 5.25 to 14 inches (average of 10.28 inches). The original pavement was underlain by a base course ranging from one to 11 inches (average of 5.18 inches) thick.

The pavement sampling and design was to be carried out by EDP Consultants under the supervision of OSU. A total of nine sections were constructed using the following six mixes:

• 4-percent lime with 6-percent fly ash, 8-inch stabilization depth (0.7 mile)
• 5-percent lime kiln dust with 5-percent fly ash, 8-inch stabilization depth (0.6 mile)
• 3-percent lime kiln dust with 1.4 gallons per square yard emulsion, 8-inch stabilization depth (0.7 mile)
• 5-percent cement, 12-inch stabilization depth (0.8 mile)
• 2-percent cement with 1.6 gallons per square yard emulsion, 8-inch stabilization depth (0.3 mile)
• 5-inch mill and fill (two 0.1-mile sections at the north and south ends of the project, and a 0.7-mile as well as 0.1-mile sections near the middle of the project).

The FDR rehabilitation of the section Line Road was completed in five phases. Beginning in August, Strawser Paving first milled and removed 5 inches of the existing pavement asphalt surface. In the second phase, Base Construction pre-pulverized the remaining pavement materials to various depths as listed above.

The third phase involved treating the pulverized pavement materials with admixtures as outlined above. Water was then added to the mix and it was compacted immediately. The last phase involved resurfacing the pavement with 5 inches of hot mix asphalt and was completed by mid-October.

"All construction has been completed and our office believes that the construction portion of the project has cost-efficiently improved the structural strength and has allowed for the existing roadway materials to be homogenously stabilized by integrating fly ash, lime, and lime kiln dust," says Jerry Ungashick, project manager, Delaware County Engineer's Office.