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

Guerrero Bustos, Ana and Goñi Elizalde, Sara and Allegro, V.R. (2008). Effect of temperature on the durability of class C fly ash belite cement in simulated radioactive liquid waste: Synergy of chloride and sulphate ions. "Journal of Hazardous Materials", v. 165 (n. 1-3); pp. 903-908. ISSN 0304-3894. https://doi.org/10.1016/j.jhazmat.2008.10.073.

Description

Title: Effect of temperature on the durability of class C fly ash belite cement in simulated radioactive liquid waste: Synergy of chloride and sulphate ions
Author/s:
  • Guerrero Bustos, Ana
  • Goñi Elizalde, Sara
  • Allegro, V.R.
Item Type: Article
Título de Revista/Publicación: Journal of Hazardous Materials
Date: January 2008
ISSN: 0304-3894
Volume: 165
Subjects:
Freetext Keywords: Fly ash belite cement, Durability, Synergy, Chloride + sulphate waste, Microstructure
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ingeniería Civil: Construcción
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The 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 theKoch–Steinegger test, at the temperature of 20 ◦Cand 40 ◦Cduring a period of 180days. The durability has been evaluated by the changes of the flexural strength of mortar, fabricatedwith this cement, immersed in a simulated radioactive liquid waste rich in sulfate (0.5 M), chloride (0.5M) and sodium (1.5M) 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.

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