Abstract
Wood waste ash (WWA) was utilized as sole solid precursor in alkali-activated material (AAM) with NaOH as alkaline activator. WWA was milled at different times (15–30-60–120-180–240-300–360-600 min) to obtain the optimum milling time. Characterization results showed that WWA was mainly composed of SiO2 (68.6 wt%); XRD identified amorphous phase, quartz, and calcite; and volume moment mean diameter (D[4,3]) was 9.97 µm after 240 milling minutes. XRD/FTIR of pastes showed that WWA reacted with NaOH, chemical shrinkage concluded that occurred formation of expansive reaction products, and SEM/EDS identified poorly compacted and layered Na-Si reaction products. Compressive strength of mortars reached 17.0 ± 0.8 MPa (3 days at 65 °C) and 5.0 ± 0.2 MPa (7 days at 25 °C). Highest reaction development and strength were obtained for AAM produced with WWA milled for 240 min.
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