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