Abstract
Raman spectroscopy was used to characterise the corrosion products of reinforcing steel embedded in activated fly ash mortars in the presence of 0.4% and 2% chlorides. Two alkaline solutions with different soluble silica contents were utilised to activate the fly ash. Raman spectra were obtained using two excitation wavelengths (532 and 633nm) and making power scans to select the suitable conditions of register for each wavelength. The main steel corrosion products identified were iron oxyhydroxides with low crystallinity, goethite (α-FeOOH) and lepidocrocite (γ-FeOOH). These products need to be studied using a spectrometer with the laser line of 532nm at low powers from 0.025 to 0.25mW or a spectrometer with the laser line of 633nm at high power between 2.5 and 25mW.
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