The Yield Stress of Cement Pastes as Obtained by Different Rheological Approaches
Different rheological methods for yield stress estimation of cement pastes during initial hydration were used and results were compared. These methods include measuring of the hysteresis loop, flow curves (recalculated to the same time of hydration) and large amplitude oscillating strain (LAOS). Exp...
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2015-10-01
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doaj-174b5c23d8f745b4a6d722b5bb17f63e2021-09-06T19:41:56ZengDe GruyterApplied Rheology1617-81062015-10-0125591910.3933/applrheol-25-53517The Yield Stress of Cement Pastes as Obtained by Different Rheological ApproachesMbasha Willy0Masalova Irina1Haldenwang Rainer2Malkin Alexander3Department of Civil Engineering, Cape Peninsula University of Technology, P.O. Box 652,Cape Town8000, South AfricaDepartment of Civil Engineering, Cape Peninsula University of Technology, P.O. Box 652,Cape Town8000, South AfricaDepartment of Civil Engineering, Cape Peninsula University of Technology, P.O. Box 652,Cape Town8000, South AfricaDepartment of Civil Engineering, Cape Peninsula University of Technology, P.O. Box 652,Cape Town8000, South AfricaDifferent rheological methods for yield stress estimation of cement pastes during initial hydration were used and results were compared. These methods include measuring of the hysteresis loop, flow curves (recalculated to the same time of hydration) and large amplitude oscillating strain (LAOS). Experiments were performed with four Ordinary Portland Cements from one manufacturer, produced at different factories and one polycarboxylate acid based superplasticiser (SP). The yield stress values obtained by constructing flow curves is the only method which gives information about the evolution of the rheological properties, reflecting structure evolution of cements pastes. It was shown that the yield stress values established by the LAOS method and that calculated from the flow curves are similar while the values found from the downward part of the hysteresis loops are much lower. Differences in the yield stress values obtained by various methods are related to the different states of the material corresponding to the kinetics of hydration. The hysteresis loops provide information about thixotropic characteristics of the material including characteristic times of rebuilding and the rate of yield stress evolution of cements. The rheological properties are very sensitive to the chemical and physical differences of the cements and could be used for their characterization.https://doi.org/10.3933/applrheol-25-53517yield stresshydrationsuperplasticiserrheologyflow curveshysteresis loopsthixotropy |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Mbasha Willy Masalova Irina Haldenwang Rainer Malkin Alexander |
spellingShingle |
Mbasha Willy Masalova Irina Haldenwang Rainer Malkin Alexander The Yield Stress of Cement Pastes as Obtained by Different Rheological Approaches Applied Rheology yield stress hydration superplasticiser rheology flow curves hysteresis loops thixotropy |
author_facet |
Mbasha Willy Masalova Irina Haldenwang Rainer Malkin Alexander |
author_sort |
Mbasha Willy |
title |
The Yield Stress of Cement Pastes as Obtained by Different Rheological Approaches |
title_short |
The Yield Stress of Cement Pastes as Obtained by Different Rheological Approaches |
title_full |
The Yield Stress of Cement Pastes as Obtained by Different Rheological Approaches |
title_fullStr |
The Yield Stress of Cement Pastes as Obtained by Different Rheological Approaches |
title_full_unstemmed |
The Yield Stress of Cement Pastes as Obtained by Different Rheological Approaches |
title_sort |
yield stress of cement pastes as obtained by different rheological approaches |
publisher |
De Gruyter |
series |
Applied Rheology |
issn |
1617-8106 |
publishDate |
2015-10-01 |
description |
Different rheological methods for yield stress estimation of cement pastes during initial hydration were used and results were compared. These methods include measuring of the hysteresis loop, flow curves (recalculated to the same time of hydration) and large amplitude oscillating strain (LAOS). Experiments were performed with four Ordinary Portland Cements from one manufacturer, produced at different factories and one polycarboxylate acid based superplasticiser (SP). The yield stress values obtained by constructing flow curves is the only method which gives information about the evolution of the rheological properties, reflecting structure evolution of cements pastes. It was shown that the yield stress values established by the LAOS method and that calculated from the flow curves are similar while the values found from the downward part of the hysteresis loops are much lower. Differences in the yield stress values obtained by various methods are related to the different states of the material corresponding to the kinetics of hydration. The hysteresis loops provide information about thixotropic characteristics of the material including characteristic times of rebuilding and the rate of yield stress evolution of cements. The rheological properties are very sensitive to the chemical and physical differences of the cements and could be used for their characterization. |
topic |
yield stress hydration superplasticiser rheology flow curves hysteresis loops thixotropy |
url |
https://doi.org/10.3933/applrheol-25-53517 |
work_keys_str_mv |
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