Effect of temperature on the hydration of Portland cement blended with siliceous fly ash
Deschner F, Lothenbach B, Winnefeld F, Neubauer J, Neubauer J (2013)
Publication Language: English
Publication Type: Journal article
Publication year: 2013
Journal
Publisher: Elsevier
Pages Range: 169-181
Journal Issue: 52
DOI: 10.1016/j.cemconres.2013.07.006
Abstract
The effect of temperature on the hydration of Portland cement pastes blended with 50 wt.% of siliceous fly ash is investigated within a temperature range of 7 to 80 C. The elevation of temperature accelerates both the hydration of OPC and fly ash. Due to the enhanced pozzolanic reaction of the fly ash, the change of the composition of the C-S-H and the pore solution towards lower Ca and higher Al and Si concentrations is shifted towards earlier hydration times. Above 50 C, the reaction of fly ash also contributes to the formation of siliceous hydrogarnet. At 80 C, ettringite and AFm are destabilised and the released sulphate is partially incorporated into the C-S-H. The observed changes of the phase assemblage in dependence of the temperature are confirmed by thermodynamic modelling. The increasingly heterogeneous microstructure at elevated temperatures shows an increased density of the C-S-H and a higher coarse porosity. © 2013 Elsevier Ltd.
Authors with CRIS profile
Involved external institutions
Switzerland (CH)How to cite
APA:
Deschner, F., Lothenbach, B., Winnefeld, F., Neubauer, J., & Neubauer, J. (2013). Effect of temperature on the hydration of Portland cement blended with siliceous fly ash. Cement and Concrete Research, 52, 169-181. https://doi.org/10.1016/j.cemconres.2013.07.006
MLA:
Deschner, Florian, et al. "Effect of temperature on the hydration of Portland cement blended with siliceous fly ash." Cement and Concrete Research 52 (2013): 169-181.
BibTeX: Download