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After the mellow period, 6-percent fly ash from Zimmer power plant of Duke Energy was blended into the mix to a depth of 12 inches. Water was added to the mix and it was compacted immediately. The last phase involved resurfacing the pavement with 4 inches of hot mix asphalt and was completed by mid-September.

"Our office is glad to be a partner with Ohio State University, the Ohio Coal Development Office and Base Construction (as well as many other private suppliers) in this FDR project using fly ash," says ," says Kurt E. Weber, P.E., P.S., chief deputy engineer, Warren County Engineer's Office. "Using FDR to repair Long Spurling Road was much more cost-effective than the alternative method of total full depth reconstruction. We're anxious to see the long term results of this project and how this method can be utilized in repairing county and township roads in the future."

Pavement instrumentation and monitoring
During construction, the Delaware and Warren pavement sections were instrumented with the following structural and environmental monitoring devices:

• Strain gauges at bottom of asphalt layer
• Pressure cells at bottom of stabilized base layer
• Pore pressure devices at bottom of stabilized base layer
• LVDTs for measuring vertical deflections of pavement
• Lysimeters installed within the stabilized base to monitor leachate quality.

Data collection from the above monitoring devices is being carried out on a quarterly basis.

Falling Weight Deflectometer (FWD) tests (to measure pavement load deflection behavior, resilient modulus of pavement layers and subgrade soil, and base structural layer coefficient) are being carried out by the Ohio Department of Transportation.