Effect of temperature on the hydration of Portland cement blended with siliceous fly ash

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Deschner F, Lothenbach B, Winnefeld F, Neubauer J, Neubauer J
Zeitschrift: Cement and Concrete Research
Verlag: Elsevier
Jahr der Veröffentlichung: 2013
Heftnummer: 52
Seitenbereich: 169-181
ISSN: 0008-8846
Sprache: Englisch


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.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Neubauer, Jürgen apl. Prof. Dr.
Lehrstuhl für Mineralogie
Neubauer, Jürgen apl. Prof. Dr.
Naturwissenschaftliche Fakultät


Einrichtungen weiterer Autorinnen und Autoren

Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa) / Swiss Federal Laboratories for Materials Science & Technology


Zitierweisen

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://dx.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: 

Zuletzt aktualisiert 2018-09-08 um 16:38