Journal article

Attenuated total reflectance Fourier transform infrared analysis of fly ash geopolymer gel aging

Catherine A Rees, John L Provis, Grant C Lukey, Jannie SJ van Deventer

LANGMUIR | AMER CHEMICAL SOC | Published : 2007

Abstract

Structural changes in fly ash geopolymers activated with different sodium hydroxide and silicate concentrations are investigated using attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy over a period of 200 days. A strong correlation is found between the concentration of silicate monomer in the activating solution and the position of the main Si-O-T stretching band in the FTIR spectrum, which gives an indication of the relative changes in the gel Si/Al ratio. The FTIR spectra of geopolymer samples with activating solution concentrations of up to 1.2 M SiO2 indicate that an Al-rich gel forms before the final gel composition is reached. The time required for the sy..

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University of Melbourne Researchers