Rheo-viscoelastic behavior and viscosity prediction of calcium sulphoaluminate modified Portland cement pastes

Peng, Y. M., Unluer, C. and Shi, J.Y. (2021) Rheo-viscoelastic behavior and viscosity prediction of calcium sulphoaluminate modified Portland cement pastes. Powder Technology, 391, pp. 344-352. (doi: 10.1016/j.powtec.2021.06.023)

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In this study, the rheo-viscoelastic behaviors of calcium sulphoaluminate (CSA) modified Portland cement (PC) pastes were investigated. The shear stress, apparent viscosity, frequency sweep and time sweep curves of composite pastes with different PC and CSA volume fractions were analyzed, and the minimum apparent viscosity (ηmin) of PC-CSA pastes were predicted. Results show that with the increase of PC and CSA volume fractions, ηmin, critical strain and flow strain of pastes increase at both 5 min and 60 min resting time, and the phase angle varies under different time spots. The accuracy of viscosity prediction models for 5 min and 60 min are both relatively high. Meanwhile, the reason why the prediction accuracy of 5 min is higher than 60 min is that with the prolongation of resting time, the relationships between particle volume fractions and rheological properties are affected by early microstructure formed by flocs and hydration products, thus affecting their original functional relationship at 5 min.

Item Type:Articles
Additional Information:This work was financially supported by China Scholarship Council (grant number: 202006370082).
Glasgow Author(s) Enlighten ID:Unluer, Dr Cise
Authors: Peng, Y. M., Unluer, C., and Shi, J.Y.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Powder Technology
ISSN (Online):1873-328X
Published Online:18 June 2021
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Powder Technology 391:344-352
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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