Abstract
It has been widely reported that self-compacting concrete and other cement-based materials are shear-thickening materials. However, there is a lack of an analytical model on the prediction of flow rate–pressure drop relation in the pumping of concrete that takes into account both the presence of the lubrication layer and the shear-thickening behavior of fresh concrete. This work fills this gap by extending analytical predictions of concrete pumping in the presence of a lubrication layer to nonlinear rheological models including the Herschel–Bulkley model and the modified Bingham model. In doing so, a new method is developed to obtain the flow rate–pressure drop relation for the steady Hagen–Poiseuille coaxial flow of two immiscible, incompressible fluids. Analytical expressions are presented for the flow rate–pressure drop relation, shear rate distribution, and velocity distribution based on the two-fluid Herschel–Bulkley model and separately based on the two-fluid modified Bingham model. With those analytical expressions, volumetric flow rate vs. pressure loss curves can be readily constructed, given values for the other eight quantities: three for the rheological properties of the bulk concrete, three for the rheological properties of the fluid in the lubrication layer, pipe radius, and thickness of the lubrication layer.
| Original language | English |
|---|---|
| Article number | 107035 |
| Number of pages | 17 |
| Journal | Cement and Concrete Research |
| Volume | 163 |
| DOIs | |
| Publication status | Published - Jan 2023 |
Funding
This work was funded by Nazarbayev University under Faculty-development competitive research grants program for 2020-2022 Grant №240919FD3925 fdcrgp2019, Y.W. and under the Social Policy Grant. This work was also funded by the National Key Research and Development Program of China ( 2017YFB0310100 ) and the State Key Laboratory of High-Performance Civil Engineering Materials ( 2014CEM001 ). Y.W. acknowledges Qianqian Zhang (Sobute), Yong Yang (Sobute), Dr. Xin Shu (Sobute), Prof. Dr. Qianping Ran (Southeast University, China), and Prof. Dr. Kamal H. Khayat (Missouri S&T) for useful inputs and valuable comments on an earlier version of the work. This work was funded by Nazarbayev University under Faculty-development competitive research grants program for 2020-2022 Grant №240919FD3925 fdcrgp2019, Y.W. and under the Social Policy Grant. This work was also funded by the National Key Research and Development Program of China (2017YFB0310100) and the State Key Laboratory of High-Performance Civil Engineering Materials (2014CEM001). Y.W. acknowledges Qianqian Zhang (Sobute), Yong Yang (Sobute), Dr. Xin Shu (Sobute), Prof. Dr. Qianping Ran (Southeast University, China), and Prof. Dr. Kamal H. Khayat (Missouri S&T) for useful inputs and valuable comments on an earlier version of the work.
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 3 Good Health and Well-being
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SDG 4 Quality Education
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SDG 6 Clean Water and Sanitation
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SDG 7 Affordable and Clean Energy
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SDG 9 Industry, Innovation, and Infrastructure
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SDG 12 Responsible Consumption and Production
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SDG 13 Climate Action
Keywords
- Concrete
- Lubrication layer
- Pumping
- Rheology
- Shear-thickening
ASJC Scopus subject areas
- Building and Construction
- General Materials Science
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