Memorias de investigación
Artículos en revistas:
Effect of temperature on the durability of class C fly ash belite cement in simulated radioactive liquid waste: Synergy of chloride and sulphate ions
Año:2008
Áreas de investigación
  • Materiales de construccion
Datos
Descripción
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.
Internacional
Si
JCR del ISI
No
Título de la revista
J HAZARD MATER
ISSN
0304-3894
Factor de impacto JCR
0
Información de impacto
Volumen
DOI
Número de revista
0
Desde la página
903
Hasta la página
908
Mes
ENERO
Ranking
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Participantes
  • Autor: V.R. ALLEGRO
  • Autor: Sara Goñi Elizalde UPM
  • Autor: Ana Guerrero Bustos UPM
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Tecnología de la Construcción y Ciencia de los Materiales para la edificación y la obra Civil
  • Departamento: Ingeniería Civil: Construcción