English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/4950
COMPARTIR / IMPACTO:
Estadísticas
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Título

Modifications of the C–S–H Gel by Hydration at 40ºC of Belite Cements from Coal Fly Ash Class C

AutorGoñi Elizalde, Sara; Guerrero Bustos, Ana María
Palabras claveTemperature of hydration
BET-N2 surface area and pore-size distribution
Capillary porosity
C-S-H gel porosity
Mechanical strength
Fly ash belite cement
Fecha de publicación2008
EditorAmerican Ceramic Society
John Wiley & Sons
CitaciónJ. Am. Ceram. Soc., 91(1): 209–214 (2008)
ResumenThe 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 40ºC, which favored the formation of pores of 3 nm in diameter leading to higher surface area values, compared with the C–S–H gel formed at 20ºC. At a microscale, the temperature led to an increase of capillary porosity (higher than 0.05 um)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 higher than 0.05 um) 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 40ºC, the correlations were not so clear probably due to another microstructural factor such as the increase of the larger capillary porosity (higher than 0.05 um).
Descripción6 pages.-- Final full-text version of the paper available at: http://dx.doi.org/10.1111/j.1551-2916.2007.02108.x.
URIhttp://hdl.handle.net/10261/4950
DOI10.1111/j.1551-2916.2007.02108.x
ISSN0002-7820
Aparece en las colecciones: (IETCC) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
JACERS-08-40ºC-uv.pdf541,5 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.