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Application of x-ray computed tomography to characterize the pore structure of one-part alkali-activated slag/fly ash mortars containing waste ceramic aggregates [Elektronski vir]
Mastali, M. ...
One-part alkali-activated slag/fly ash mortars bring the advantages of both eco-friendly construction material and acceptable mechanical properties. One-part or "just add water" alkali-activated ...binders are an approach to reduce the negative aspects of using alkali solution during the preparation of the traditional two-part alkali activated binders. Despite the advantages of this material, the efficiency of alkali-activated slag/fly ash mortars is significantly governed by the pore distribution and size. One of the main aims of this paper was utilizing ceramic waste as aggregate in alkali-activated blast-furnace slag/fly ash binders. Since the effects of ceramic aggregates on the pore structure and strength could be critical on the strength due to their irregular shapes and providing hard casting conditions, therefore, the characterizations of pore structure and tortuosity were determined by using X-ray computed tomography (CT) technique. In this investigation, ground granulated blast-furnace slag (45% binder in mass) and fly ash (45% binder in mass) were activated by using an anhydrous sodium metasilicate (10% binder in mass). Additionally, porcelain ceramic wastes were employed as recycled aggregates. Moreover, a comparative study was conducted by using two other mix compositions, which were prepared by incorporating normal aggregates and slag as the only used precursor in the mix composition to clarify the effects of ceramic wastes and fly ash on the porosity and strength, respectively. Promisingly, this study presented that replacing normal aggregates with ceramic waste aggregates had no significant influence on the compressive strength loss (around 5%).
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