In the past decades, efforts have been made to substitute cementing material for the Portland cement by using industrial byproduct such as ground granulated blast slag (GGBS), from the iron production process. When GGBS is reacting with different alkali-activators, alkali-activated slag (AAS) can produce binding material to filling the gap between aggregates. By adding biochar to the AAS system, the extremely porous structure of biochar enables to reserve water inside and release the water as the hydration process goes on. The gradual release of water can improve the hydration degree of AAS, leading to enhanced mechanical and durability performance. In this study, the admixture of GGBS, hydrated lime, and biochar was applied to stabilize the calcareous sand. The strength of the biochar-enhanced AAS stabilized calcareous sand was measured. The results showed that with the addition of biochar AAS, the stabilized soil doesn't compromise on the strength and even shows higher strength in some cases.
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