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A Rheological Model for Evaluating the Behavior of Shear Thickening of Highly Flowable Mortar
Neither the modified Bingham model nor the Herschel–Bulkley model can be used to characterize and calculate the performance of shear thickening of highly flowable mortar because of their incalculability of the rheological parameters. A new exponential rheological model was established to solve the c...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7917666/ https://www.ncbi.nlm.nih.gov/pubmed/33672935 http://dx.doi.org/10.3390/molecules26041011 |
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author | Li, Mengyuan Han, Jianguo Zhou, Yuqi Yan, Peiyu |
author_facet | Li, Mengyuan Han, Jianguo Zhou, Yuqi Yan, Peiyu |
author_sort | Li, Mengyuan |
collection | PubMed |
description | Neither the modified Bingham model nor the Herschel–Bulkley model can be used to characterize and calculate the performance of shear thickening of highly flowable mortar because of their incalculability of the rheological parameters. A new exponential rheological model was established to solve the characterization and calculation of shear thickening of the lubrication layer (highly flowable mortar) during the pumping of concrete in this paper. This new exponential rheological model has three rheological parameters, namely, yield stress, consistency coefficient, and consistency exponent. They can quantitatively describe the yield stress, differential viscosity, and shear thickening degree of highly flowable mortar. The calculating results of the rheological parameters of the newly established model for the mortars with different compositions showed that the consistency exponent of mortar decreased with the increase of its sand-binder ratio or the dosage of fly ash in the binder. This indicates that the shear thickening degree of mortar decreases. The consistency exponent of mortar initially decreases and subsequently increases with the increase in silica fume content or the dosage of the superplasticizer. It illustrates that the degree of the shear thickening of mortar initially decreased and subsequently increased. These varying patterns were confirmed by the rheological experiment of mortars. |
format | Online Article Text |
id | pubmed-7917666 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-79176662021-03-02 A Rheological Model for Evaluating the Behavior of Shear Thickening of Highly Flowable Mortar Li, Mengyuan Han, Jianguo Zhou, Yuqi Yan, Peiyu Molecules Article Neither the modified Bingham model nor the Herschel–Bulkley model can be used to characterize and calculate the performance of shear thickening of highly flowable mortar because of their incalculability of the rheological parameters. A new exponential rheological model was established to solve the characterization and calculation of shear thickening of the lubrication layer (highly flowable mortar) during the pumping of concrete in this paper. This new exponential rheological model has three rheological parameters, namely, yield stress, consistency coefficient, and consistency exponent. They can quantitatively describe the yield stress, differential viscosity, and shear thickening degree of highly flowable mortar. The calculating results of the rheological parameters of the newly established model for the mortars with different compositions showed that the consistency exponent of mortar decreased with the increase of its sand-binder ratio or the dosage of fly ash in the binder. This indicates that the shear thickening degree of mortar decreases. The consistency exponent of mortar initially decreases and subsequently increases with the increase in silica fume content or the dosage of the superplasticizer. It illustrates that the degree of the shear thickening of mortar initially decreased and subsequently increased. These varying patterns were confirmed by the rheological experiment of mortars. MDPI 2021-02-14 /pmc/articles/PMC7917666/ /pubmed/33672935 http://dx.doi.org/10.3390/molecules26041011 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Li, Mengyuan Han, Jianguo Zhou, Yuqi Yan, Peiyu A Rheological Model for Evaluating the Behavior of Shear Thickening of Highly Flowable Mortar |
title | A Rheological Model for Evaluating the Behavior of Shear Thickening of Highly Flowable Mortar |
title_full | A Rheological Model for Evaluating the Behavior of Shear Thickening of Highly Flowable Mortar |
title_fullStr | A Rheological Model for Evaluating the Behavior of Shear Thickening of Highly Flowable Mortar |
title_full_unstemmed | A Rheological Model for Evaluating the Behavior of Shear Thickening of Highly Flowable Mortar |
title_short | A Rheological Model for Evaluating the Behavior of Shear Thickening of Highly Flowable Mortar |
title_sort | rheological model for evaluating the behavior of shear thickening of highly flowable mortar |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7917666/ https://www.ncbi.nlm.nih.gov/pubmed/33672935 http://dx.doi.org/10.3390/molecules26041011 |
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