Abstract
Properties and characteristics of sodium silicate activated fly-ash-based geopolymers have been extensively investigated, but the utilization of sodium aluminate activation has received little attention. The present work, therefore, examines the properties of the starting materials and sodium aluminate solutions and their effect on the final material properties and microstructure of fly-ash-based geopolymers. To achieve this, starting sodium aluminate solutions were characterized with ATR-FTIR and 27Al NMR spectroscopies to determine the coordination state of aluminum as a function of solution concentration and [OH]/[Al] ratio. Various fly-ash-based geopolymeric matrixes were synthesized utilizing fly ash, kaolinite, K-feldspar, and slag as the mineral aluminum sources. The matrixes were activated with alkali silicate or alkali aluminate solutions as a function of pH, concentration, and alkali ion (Na+ or K+). FTIR and XRD studies combined with compressive strength tests demonstrated that in certain cases...
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