Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Modifications of the C–S–H Gel by Hydration at 401C of Belite Cements from Coal Fly Ash Class C
Year:2008
Research Areas
  • Construction materials
Information
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–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).
International
Si
JCR
No
Title
J AMER CERAM SOCIETY
ISBN
0002-7820
Impact factor JCR
0
Impact info
Volume
91
Journal number
1
From page
209
To page
214
Month
ENERO
Ranking
Participants
  • Autor: Ana Guerrero Bustos (UPM)
  • Autor: Sara Goñi Elizalde (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Tecnología de la Construcción y Ciencia de los Materiales para la edificación y la obra Civil
  • Departamento: Ingeniería Civil: Construcción
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