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.

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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.

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