Memorias de investigación
Artículos en revistas:
Modifications of the C–S–H Gel by Hydration at 401C of Belite Cements from Coal Fly Ash Class C
Año:2008
Áreas de investigación
  • Materiales de construccion
Datos
Descripción
The influence of the temperature on two types of hydrated fly ash belite cement (FABC) pastes were investigated at a nanoscale (1–100 nm) by measuring the specific surface area and pore-size distribution by the sorption isotherms of nitrogen gas and the BET method, and at a microscale from the pore-size distribution measured by mercury intrusion porosimetry. The two belite cements were fabricated by the hydrothermal–calcination route of fly ash class C in NaOH 1M solution (FABC-2- N) and demineralized water (FABC-2-W). In the case of FABC- 2-W, a densification of the C–S–H gel was produced at the temperature of 401C, which favored the formation of pores B3 nm in diameter leading to higher surface area values, compared with the C–S–H gel formed at 201C. At a microscale, the temperature led to an increase of capillary porosity (40.05 lm) at a later age of hydration and, consequently, a decrease of compressive mechanical strength. In the case of FABC-2-N, the densification of the gel was less evident, but the increase of capillary porosity (pores of diameter 40.05 lm) was higher. Significant direct linear quantitative correlations were found among these nanostructure characteristics of the C–S–H gel and macrostructural engineering property such as the compressive mechanical strength, for the two FABC-2-W and FABC-2-N cements under normal conditions. At 401C, the correlations were not so clear probably due to another microstructural factor such as the increase of the larger capillary porosity (40.05 lm).
Internacional
Si
JCR del ISI
No
Título de la revista
J AMER CERAM SOCIETY
ISSN
0002-7820
Factor de impacto JCR
0
Información de impacto
Volumen
91
DOI
Número de revista
1
Desde la página
209
Hasta la página
214
Mes
ENERO
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Participantes
  • Autor: Ana Guerrero Bustos UPM
  • Autor: Sara Goñi Elizalde 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