Stabilization of an expansive artificial clay mixture with C/F type fly ash and sand

Fly ash, which is an industrial by-product from coal-fired thermal power plants, is accumulating in large quantities in many countries. In this study the possible utilization of fly ash as a stabilizing agent for expansive soils is investigated. Two types of fly ash, classified as types F and C according to ASTM C 618 (ASTM, 1993), were employed together with sand to stabilize a highly expansive clay mixture. Classification tests and chemical composition of the materials as well as free swell, primary swell time and swell pressure of the test specimens were determined. Some of the specimens were also cured for 7 and 28 days before subjecting them to the tests. The results showed that samples treated with fly ash exhibited a decrease in free swell and swell pressure. The stabilization with type C fly ash was more effective. Increasing the curing time also improved the stabilization effect. With sand replacing fly ash, the reduction in swelling is enhanced. The specimen with 15% type C fly ash and 10% sand and with 28 days cure yielded the best performance.
Geotechnical Engineering


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Citation Formats
E. Çokça, “Stabilization of an expansive artificial clay mixture with C/F type fly ash and sand,” Geotechnical Engineering, pp. 93–99, 2002, Accessed: 00, 2021. [Online]. Available: