Abstract
In order to enrich the porosity and high-temperature performance of geopolymer, a facile synthesis of foamed fly ash/slag-based cenosphere/geopolymer composite and its in-situ formation of porous ceramic via heat treatment were provided. The synergistic effects of H2O2 and fly ash cenospheres (FACs) on the phase evolution, pore distribution and properties were investigated. Results showed that the foamed samples with amorphous structure could be synthesized at room temperature and fully crystallized to porous ceramics containing mullite and leucite after treated above 1000 °C. Porosity of the samples was enhanced with the increase of H2O2 ratio (1–6 wt%) and treated temperature (600–1200 °C). Compressive strength of the whole composites was improved after treatment, which was attributed to the crystallization, good interface combination (between FACs and matrix), fractured spheres and crack deflection. Thesamples also showed lowest thermal conductivityof 0.115 W/(m⋅K) and 0.107 W/(m⋅K) before and after high-temperature treatment, respectively. It provided a strategy to prepare porous foam using solid waste and had the application to be used in insulationfields.
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