Pressure Loss Prediction of Fresh Concrete Pumping Based on CFD Simulation
WEI Ziyi1, AN Xiaopeng1, SHI Caijun2, WU Bin1, YUAN Qiang3
1 State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024 2 Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082 3 National Engineering Laboratory for High Speed Railway Construction, School of Civil Engineering, Central South University, Changsha 410075
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.
作者简介: 魏子易,中国建筑材料科学研究总院硕士研究生,本科毕业于同济大学,申请国家发明专利2项, 史才军教授,国家第二批“千人计划”特聘专家、湖南省特聘专家、亚洲混凝土联合会副主席、湖南大学985工程创新平台首席科学家、特聘教授、博士研究生导师,中国建筑材料科学研究总院特聘教授、博士研究生导师,Taylor and Francis 学术期刊Journal of Sustainable Cement-based Materials创刊主编, 中国硅酸盐学会会刊《硅酸盐学报》副主编,Elsevier著名学术期刊Cement and Concrete Research,Cement and Concrete Compo-sites,Construction and Building Materials,Taylor&Francis学术期刊Journal of Structural Integrity and Maintenance,西班牙Materiales de Construccion,《材料导报》《建筑材料学报》《重庆交通大学学报》《中国水泥》等期刊编委;美国土木工程学会会刊Journal of Materials in Civil Engineering前副主编。国际上50多种著名学术期刊审稿人,中国硅酸盐学会理事,美国混凝土学会 (ACI)、美国材料与试验学会 (ASTM)、加拿大标准协会(CSA)及国际材料与结构联合会(RILEM)中多个专业委员会的会员、加拿大安大略省注册职业工程师。史才军教授在水泥和混凝土材料的设计、测试、耐久性、智能防渗漏材料及废物的利用和处置方面做了广泛深入的研究工作,发表高水平学术论文300余篇。出版英文著作6部,中文著作3部,合编国际会议英文论文集6本,组织和主持了8个国际学术会议和3次专题研讨会及3个全国性会议,在国际学术会议应邀担任专家委员会委员或分会主席100多次、大会主题报告50多次,并应邀到世界各地100多所大学和公司做学术报告和专题讲座;2014年获湖南省“潇湘友谊”奖。2015—2017年“建设与建造”领域中国高被引学者,2016年全球土木工程领域高被引学者,2001、2007和2016年分别当选为国际能源研究会、美国混凝土学会及国际材料与结构联合会的会士(Fellow)。
引用本文:
魏子易,安晓鹏,史才军,武斌,元强. 基于CFD模拟的新拌混凝土泵送压力损失预测[J]. 材料导报, 2019, 33(22): 3738-3743.
WEI Ziyi, AN Xiaopeng, SHI Caijun, WU Bin, YUAN Qiang. Pressure Loss Prediction of Fresh Concrete Pumping Based on CFD Simulation. Materials Reports, 2019, 33(22): 3738-3743.
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2019, Vol. 33 
