Fly Ash Winner

By: Roads & Bridges

The Coal Combustion Products Partnership recently awarded first prize to a cold in-place (CIP) asphalt recycling project that was developed jointly by the Cement Division of Lafarge North America, Kansas City Power & Light (KCP&L), the University of Missouri at Kansas City (UMKC) and Jackson County, Mo.

CIP breaks up asphalt pavement and uses it as the base for a new roadway. Self-cementing fly ash, produced by KCP&L and marketed by Lafarge, was mixed with the recycled asphalt and acted as a cementing agent and stabilizer.

Dr. Anil Misra and a team of students from UMKC conducted a variety of tests on the road base. The tests will provide guidance for future pavement designs.

CIP reduces the need for virgin materials and eliminates the need for disposal of the old roadway. Construction costs are about one-third less than removal and replacement. Compared with other asphalt-recycling methods, the process uses less energy and creates pavements that last five times longer.