Modifications of the C–S–H gel by hydration at 40 ºC of belite cements from coal fly ash class C

Goñi Elizalde, Sara and Guerrero Bustos, Ana (2008). Modifications of the C–S–H gel by hydration at 40 ºC of belite cements from coal fly ash class C. "Journal of the American Ceramic Society", v. 91 (n. 1); pp. 209-214. ISSN 1551-2916. https://doi.org/10.1111/j.1551-2916.2007.02108.x.

Description

Title: Modifications of the C–S–H gel by hydration at 40 ºC of belite cements from coal fly ash class C
Author/s:
  • Goñi Elizalde, Sara
  • Guerrero Bustos, Ana
Item Type: Article
Título de Revista/Publicación: Journal of the American Ceramic Society
Date: January 2008
ISSN: 1551-2916
Volume: 91
Subjects:
Freetext Keywords: Temperature of hydration, BET-N2 surface area and pore-size distribution, capillary porosity, C-S-H gel porosity, mechanical strength, fly ash belite cement.
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 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–calcinations 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).

More information

Item ID: 2891
DC Identifier: http://oa.upm.es/2891/
OAI Identifier: oai:oa.upm.es:2891
DOI: 10.1111/j.1551-2916.2007.02108.x
Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1551-2916.2007.02108.x/abstract
Deposited by: Memoria Investigacion
Deposited on: 06 May 2014 14:37
Last Modified: 20 Apr 2016 12:31
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