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Effect of temperature on the durability of class C fly ash belite cement in simulated radioactive liquid waste: Synergy of chloride and sulphate ions

AuthorsGuerrero Bustos, Ana María; Goñi Elizalde, Sara; Allegro, Virgina
KeywordsFly ash belite cement
Chloride + sulphate waste
Issue Date15-Jun-2009
PublisherElsevier BV
CitationJournal of Hazardous Materials 165(1-3): 903-908 (2009)
AbstractThe durability of class C fly ash belite cement (FABC-2-W) in simulated radioactive liquid waste (SRLW) rich in a mixed sodium chloride and sulphate solution is presented here. The effect of the temperature and potential synergic effect of chloride and sulfate ions are discussed. This study has been carried out according to the Koch-Steinegger test, at the temperature of 20 °C and 40 °C during a period of 180 days. The durability has been evaluated by the changes of the flexural strength of mortar, fabricated with this cement, immersed in a simulated radioactive liquid waste rich in sulfate (0.5 M), chloride (0.5 M) and sodium (1.5 M) ions - catalogued like severely aggressive for the traditional Portland cement - and demineralised water, which was used as reference. The reaction mechanism of sulphate, chloride and sodium ions with the mortar was evaluated by scanning electron microscopy (SEM), porosity and pore-size distribution, and X-ray diffraction (XRD). The results showed that the chloride binding and formation of Friedel's salt was inhibited by the presence of sulphate. Sulphate ion reacts preferentially with the calcium aluminate hydrates forming non-expansive ettringite which precipitated inside the pores; the microstructure was refined and the mechanical properties enhanced. This process was faster and more marked at 40 °C. © 2008 Elsevier B.V. All rights reserved.
Publisher version (URL)http://dx.doi.org/10.1016/j.jhazmat.2008.10.073
Identifiersdoi: 10.1016/j.jhazmat.2008.10.073
issn: 0304-3894
Appears in Collections:(IETCC) Artículos
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