Optimum Use of Sugar Cane Straw Ash in Alkali-Activated Binders Based on Blast Furnace Slag

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Bassan de Moraes, Joao Claudio [UNESP]
Tashima, Mauro Mitsuuchi [UNESP]
Pinheiro Melges, Jose Luiz [UNESP]
Akasaki, Jorge Luis [UNESP]
Monzo, Jose
Victoria Borrachero, Maria
Soriano, Lourdes
Paya, Jordi

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Asce-amer Soc Civil Engineers


Alkali-activated binders (AABs) are a material obtained from the combination of a solid precursor and an alkaline activating solution. In this study, one solid precursor used was blast-furnace slag (BFS) and the other was an agro waste: sugar cane straw ash (SCSA). Sodium hydroxide was used for preparing activating solutions. In order to reach the potential reactivity of the SCSA, a study varying the BFS/SCSA mass ratio and H2O/Na2O molar ratio was carried out. The BFS/SCSA ratio varied from 100/0 to 70/30, and H2O/Na2O was studied in the range of 11.1-18.5. To fulfill this objective, specimens were assessed by their compressive strength of mortars and microstructural studies of pastes [X-ray diffraction (XRD); thermogravimetric analysis (TGA); Fourier transform infrared spectroscopy (FTIR); and field emission scanning electron microscopy (FESEM)] in the curing time range of 3-90 days at 25 degrees C. Results from these tests showed that the best BFS/SCSA and H2O/Na2O ratios were 70/30 and 18.5, respectively. This study revealed an interesting valorization of the SCSA as a complementary precursor in BFS-based AABs because of the improvement of mechanical properties and the reduction in the consumption of BFS in AAB.



Agro waste, Optimum replacement, Microstructural studies, Compressive strength

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Journal Of Materials In Civil Engineering. Reston: Asce-amer Soc Civil Engineers, v. 30, n. 6, 12 p., 2018.