Abstract
The use of coal fly ash (CFA) to produce ceramics is an effective approach to achieve its large-scale and high value-added utilization. In this work, a novel ceramic was prepared from CFA rich in CaO that was pretreated by alkali activation. The results showed that alkali activation promoted to generate zeolite P, covering the surface of CFA particles, which accelerated the densification process of ceramics. The prepared ceramics sintered at 1175 °C exhibited excellent physical properties with a water absorption of 0.22 ± 0.04%, an apparent porosity of 0.42 ± 0.09%, and a bending strength of 77.6 ± 2.31 MPa. The needle-shaped crystal of generated labradorite phase formed an interlocking network structure, which provided a high bending strength of ceramics. Such novel ceramics could be used as industrial structural materials and building floor materials.
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