Olive-stone biomass ash (OBA): An alternative alkaline source for the blast furnace slag activation
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Data
2018-07-30
Autores
de Moraes Pinheiro, Sayonara Maria
Font, Alba
Soriano, Lourdes
Tashima, Mauro M. [UNESP]
Monzó, José
Borrachero, Maria Victoria
Payá, Jordi
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Resumo
Alkali activated materials (AAM) are being investigated as an alternative binder that could be more eco-efficient than Portland cement. The effect of olive-stone biomass ash (OBA) on the activation of blast furnace slag (BFS) was studied. The mechanical behaviour of mortars in which OBA was replaced, or added to, BFS were compared to those found for BFS mortars activated with potassium hydroxide (KOH) and sodium hydroxide (NaOH) solutions in the range of 4–12 mol·kg−1. The results showed the high efficiency of OBA as activating reagent because it provided similar, or higher, strengths when compared to the alkali hydroxide activating solutions. The microstructural characteristics of the new binding OBA/BFS systems were assessed by X-ray diffraction (XRD), thermogravimetric analysis (TGA), field emission scanning electron microscopy (FESEM) and mercury intrusion porosimetry (MIP). These systems showed lower mean pore diameter and scarcer formation of zeolite structures when compared to KOH/BFS systems. These promising results demonstrated the viability of the use of these type of ashes as activating reagents in AAM.
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Palavras-chave
Alkali activated material, Blast furnace slag, Conservation, Olive-stone biomass ash, Strength development
Como citar
Construction and Building Materials, v. 178, p. 327-338.