Abstract
Approximately 100,000 m3 of atmospheric fluidized bed combustion (FBC) ash and stoker ash were used as structural fill in the construction of a large roadway embankment. The embankment is ∼200 m long and 10 m high, and it supports an extension of a street across a gravel quarry in West Lafayette, Ind. The use of coal combustion by-products on this project was motivated by the need to find cost-effective alternatives to the disposal of these materials in solid-waste landfills. Similar projects have been completed using the more common bottom ash and fly ash. However, little information is available related to the performance of FBC and stoker ashes in this application. An overview of the project and construction operations is described, and the results of geotechnical laboratory tests and field monitoring are presented. Instruments used in the monitoring of fill behavior include settlement plates, vertical and horizontal inclinometers, seismic cross-hole tests, and postconstruction standard penetration tests. The compacted FBC material exhibited significant swell stresses and strains and is still expanding 2 years after construction.
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