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Abstract

Clayey soil stabilization is one of the important topics of the geotechnical engineering where binder stabilization is widely used to increase the bearing capacity and reduce the settlements of the soil layers. However mechanical performance of the binder stabilized clays is generally lower than sands and more dependent on soil properties. Utilization of the alkali-activated by-products, such as fly-ash (FA) and ground granulated blast furnace-slag (GGBS) as a binder in clays is an emerging topic where traditional cement can be replaced with these industrial waste materials. Recycling these materials provides advantages in reduction of the carbon footprint and construction costs while supporting the sustainability in circular economy and environment. However complex geochemical nature of the clays demands more attention than sands when stabilized with alkali-activated binders (AAB). Applicability of the AAB in clayey soils is investigated in this study with laboratory tests performed on the clay samples collected from a site. GGBS and FA materials from local sources of Turkey were utilized in the investigation. Unconfined compression strength (UCS) tests were performed on the prepared samples after 10, 16 and 52 weeks. Modulus of elasticity of the samples are also determined. Mechanical performance of the AAB stabilized clay samples was evaluated. UCS and modulus of elasticity values were compared with the applications performed on the sand samples.

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