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The FWD tests carried out on the pavement before and immediately after completion of rehabilitation show that FDR of the pavements with fly ash (and lime or lime kiln dust) increased the elastic modulus of the base layer. The fly ash sections exhibited elastic moduli of base layers similar to cement and cement plus emulsion sections.

FWD tests will continue to be carried out twice a year to determine the longer term elastic moduli of the various sections constructed in this project.

Benefits
The project findings will enable the users of the technology to reap significant cost savings when compared with the common practice of removing old pavement and rebuilding the roadway.

In addition, the technology addresses a very important environmental issue, says Professor William Wolfe of OSU's Department of Civil and Environmental Engineering and Geodetic Science.

"Since the production of one ton of cement produces about one ton of carbon dioxide, which is then released into the atmosphere," he says, "the widespread replacement of cement with fly ash in roadway reconstruction will result in significant reductions in the generation of this greenhouse gas."