Micro-Structural Characterization of Activating Solution with Siliceous Species on Chemical Reactivity of Geopolymer by Advanced Analytical Techniques

T. Revathi1,2, R. Jeyalakshmi2,* and N.P. Rajamane1

1Centre for Advanced Concrete Research, SRM University, Kattankulathur-603 203, India

2Department of Chemistry, SRM University, Kattankulathur-603 203, India

*Corresponding author: E-mail: rajyashree64@gmail.com

Abstract

Geopolymers are a class of inorganic polymer that act as an alumino-silicate sustainable binder alternative to ordinary portland cement. The environmental impact of fly ash in terms of its immense production and dumping huge quantity of fly ash in land-living is the major concern for everyone. It is synthesized from the industrial waste or by-products like fly ash, ground granulated blast furnace slag, metakaolin, red mud, etc., mediated in alkaline environment. The alkali mediated fly ash is one of the ecologically benign process which transforms partially/wholly vitreous structure into pozzolanic binder network. Geopolymer shows an excellent property in terms of early strength gain, resistant towards acid attack, sulfate attack, fire and maintains good performance when exposed to elevated temperatures. The chemistry of geopolymerization reaction is more complex and multi-phase nature of the precursor material shows disordered glassy layer network arrangement. The present article focused on the reactivity of fly ash, development of new NASH geopolymeric binder gel in alkaline environment were studied by X-ray fluorescence, X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, zeta potential, 29Si MAS-NMR and ATR FT-IR spectroscopies. Thermal steadiness of geopolymeric matrix was analyzed using TGA/DTA.

Keywords

Geopolymer, Fly ash, Siliceous species, Zeta potential.

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