Abstract
Açai seed ash (ASA) was assessed as a new alkaline activator in alkali-activated binders (AAB) based on blast-furnace slag (BFS). ASA was produced by calcination of açai seed in the laboratory, and it is mainly composed of K2O (33.75 wt%) and P2O5 (22.59 wt%), with a pH of 12.3 and solubility in water of over 35 wt%. Due to the harmful soluble phosphate, ASA was combined with Ca(OH)2 (CH) to form insoluble calcium phosphate. Four AAB mixtures were assessed after 1 day of curing at 60 °C: BFS/water, BFS/CH/water, BFS/ASA/water, and BFS/ASA/CH/water. Microstructural studies of pastes showed that the BFS/ASA/CH/water mixture presented the formation of insoluble hydroxylapatite by X-ray diffraction, the highest reaction product content (26.52 %) by Fourier transform infrared spectroscopy, and densest microstructure by scanning electron microscopy. The compressive strength of mortars showed that BFS/ASA/CH/water mixture presented the highest value of 8.7 MPa.
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