A Raman spectroscopy study of steel corrosion products in activated fly ash mortar containing chlorides
2015
Criado, María | Martínez-Ramírez, S. | Bastidas Rull, José María | Comunidad de Madrid | Ministerio de Ciencia e Innovación (España) | European Commission | Comisión Interministerial de Ciencia y Tecnología, CICYT (España) | Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
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 633 nm) 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 (a-FeOOH) and lepidocrocite (c-FeOOH). These products need to be studied using a spectrometer with the laser line of 532 nm at low powers from 0.025 to 0.25 mW or a spectrometer with the laser line of 633 nm at high power between 2.5 and 25 mW.
Show more [+] Less [-]M. Criado expresses her gratitude to the Spanish Ministry of Science and Innovation for her Juan de la Cierva contract (Ref. JDC-2010). The authors express their gratitude to Project BIA2008-05398 from CICYT, Spain, for financial support. European Community and Comunidad de Madrid for supporting two Geomateriales programs S2013/MIT- 2014.
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