Materials such as ceramic matrix composites are developed for mechanical applications at high temperature, but their cost remains a limitation. Consequently, the use of acid-based geopolymer matrices may be an alternative to reduce costs. In this study, the sample was prepared from metakaolin and phosphoric acid. FTIR and NMR spectroscopies, XRD and thermal measurements were used to understand the structural evolution of acid-based geopolymers (binders) during consolidation and after thermal treatments. According to the results, the consolidation of the binder has been divided into four steps: the dissolution of the metakaolin, the polycondensation reactions forming AlPO 4 entities and hydrated phases, the breakdown of Si-O-Al bonds with formation of various hydrated silica *Manuscript Click here to download Manuscript: manuscript.docx Click here to view linked References
Highlights: (maximum 85 characters, including spaces, per bullet point). Acid-based geopolymers display different processing-dependent working properties. Acid-based geopolymers are mostly composed of Al-O-P and Si(OH)4 networks. The quantities of Al-O-P and unreacted metakaolin govern the thermal resistance. The increase of the Young's modulus is related to a higher thermal resistance. Ordered structures and low amounts of physisobed water lead to water resistance.
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