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Fly ash from Vales Point Power Station in New South Wales was tested with respect to its suitability for the construction of geosynthetic reinforced embankments and retaining structures. Fly ash may be corrosive for metal reinforcement, hence the choice of geogrids and geotextiles as tensile reinforcement. Direct shear tests and pull-out tests indicated that ash is suitable as a fill material for geosynthetic reinforced structures. Filtration tests showed that conventional geotextiles on their own may not be able to retain all ash particles and further studies of this problem are recommended.