基于CFD模拟的新拌混凝土泵送压力损失预测

doi:10.11896/cldb.18120197

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Abstract Concrete pumping technology is becoming more and more popular in civil engineering. But the prediction of pumping pressure loss lacks effective technical methods for a long time, it relies on large coil experiments which consume a lot in engineering applications. In this paper, the influence of rheological parameters on the pressure loss of concrete pumping is studied by computational fluid dynamics (CFD) simulation, and take the experimental results as a comparison. The results showed that the SST·k-ω turbulence model can accurately predict the concrete pumping pressure loss. Viscosity is the main factor affecting pump pressure loss. The pumping loss per unit length is proportional to the viscosity. The higher the viscosity, the greater the resistance of concrete due to shearing increases with the increase of viscosity, the pressure loss increases. The pressure loss decreases with the increase of the yield stress, and when the concrete yield stress is less than 150 Pa, the pressure loss decreases more significantly as the yield stress increases. When the stress is greater than 150 Pa, the effect of yield stress on pumping loss is not obvious. The simulation method proposed in this paper could effectively determine the pumping pressure loss. In addition, the influence mechanism of rheological parameters on pumping pressure loss was studied. The results show that the rheological parameters of concrete are the main factors influencing the pressure loss. When the yield stress of fresh concrete increases, the thickness of the shear layer in the pump tube decreases, thus reducing the pressure loss per unit length in the pump tube. As the viscosity of the concrete increases, the resistance due to shearing in the pump tube increases, thereby increasing the pumping loss per unit length in the pump tube.

Key words： concrete pumping pressure loss velocity profile computational fluid dynamics (CFD) simulation

Published: 16 September 2019

CLC number:

TU528

Fund:This work was financially supported by the National Key R & D Program of China (2017YFB0310100) and National Natural Science Foundation of China (51502279).

About author:: Ziyi Wei, obtained his master's degree from the China Building Materials Academic, and obtained his bachelor's degree from Tongji University. He has applied for 2 national invention patents.
Caijun Shiis currently a chair professor of College of Civil Engineering, Hunan University and China Academy of Building Materials Academy. He received his B. Eng and M. Eng from Southeast University, Nanjing, China and his Ph.D. degree from University of Calgary, Canada. He is an Editor-in-Chief of Journal of Sustainable Cement-based Materials, associate editor of Journal of Materials in Civil Engineering, and an editorial board member of Cement and Concrete Research,Cement and Concrete Composites,Journal of Chinese Ceramic Society and Journal of Building Materials. Dr. Shi is a member of many technical committees within ACI and RILEM. His research interests include characterization and utilization of industrial by-products and waste materials, design and testing of cement and concrete materials, development and evaluation of cement additives and concrete admixtures, and solid and hazardous waste management. He has developed several novel technologies and products in these areas, and has been granted four US patents and eight Chinese patents. One of his inventions-self-sealing/self-healing barrier has been used as a municipal landfill liner in the world's largest landfill site in South Korea. He has authored/coauthored more than 290 technical papers, five English books, two Chinese books and edited/co-edited six international conference proceedings. In re-cognizing his contributions to researches in waste management and concrete technology, he was elected as a fellow of International Energy Foundation in 2001, and a fellow of American Concrete Institute in 2007.

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	WEI Ziyi
	AN Xiaopeng
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Cite this article:

WEI Ziyi,AN Xiaopeng,SHI Caijun, et al. Pressure Loss Prediction of Fresh Concrete Pumping Based on CFD Simulation[J]. Materials Reports, 2019, 33(22): 3738-3743.

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http://www.mater-rep.com/EN/10.11896/cldb.18120197 OR http://www.mater-rep.com/EN/Y2019/V33/I22/3738

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