Geopolymer Microstructure and Hydration Mechanism of Alkali-Activated Fly Ash-Based Geopolymer

Abstract:

The microstructure and hydration mechanism of alkali-activated fly ash-based geopolymer were studied by means of scanning electron microscope (SEM) coupled with energy dispersive X-ray analysis (EDXA) and field emission scanning electron microscope (FESEM). The FESEM photomicrographs indicted that the fly ash-based geopolymer showed three dimensional frameworks with an average particle size of 50 nm. EDXA results demonstrated that the Na-PSS type geopolymer was produced via the disintegration of Si-O-Al and Si-O-Si chemical bonds and the polycondensation reaction between [SiO4]4-and [AlO4]5- tetrahedrons in spherical fly ash particles under alkaline condition.

• Periodical: Advanced Materials Research (Volumes 374-377)
• Pages: 1481-1484
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.374-377.1481
• Online since: October 2011
• Authors: Yao Jun Zhang, Hai Hong Li, Ya Chao Wang, De Long Xu
• Keywords: Alkaline Activation, Fly Ash (FA), Geopolymer, Hydration, Microstructure

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