Shear Strength, Excess Pore Water Pressure, and Durability Response of Class F Fly Ash Treated with Hydrated Lime
Publication: Geo-Congress 2023
ABSTRACT
Many researchers have suggested lime treatment of class F fly ash to achieve the desired strength and durability for its use as fill material in geotechnical applications. However, stress-strain and pore pressure response of lime-treated fly ash under a saturated state has not been explored. In this study, shear strength, pore water pressure response, and durability of lime-treated class-F fly ash have been evaluated. Unconfined compressive strength of lime-treated fly ash was determined for different curing time periods (7–84 days). A series of consolidated undrained (CU) triaxial tests were performed, and a new procedure for saturation of lime-treated specimens was developed to ensure its B (saturation value) to be 0.95. This study was further extended to conduct the durability analysis for two cases: soaking under water and wetting-drying cycles. Lime-treated specimens exhibited improved strength and durability response. In addition, lime-treated specimens under saturated state showed higher dilative behavior and brittle response than untreated fly ash.
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Geo-Congress 2023
Pages: 391 - 401
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Published online: Mar 23, 2023
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