Zhan Yijian, Gong Jian, Huang Yulin, Shi Chong, Zuo Zibo, Chen Yiqun
General Engineering Institute of Shanghai Construction Group, Shanghai Construction Group Co., Ltd., Shanghai 200080, China.
Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China.
Materials (Basel). 2019 Apr 30;12(9):1415. doi: 10.3390/ma12091415.
The use of self-consolidating concrete and advanced pumping system enables efficient construction of super high-rise buildings; however, risks such as clogging or even bursting of pipeline still exist. To better understand the fresh concrete pumping mechanisms in detail, the discrete element method is employed in this paper for the numerical simulation of local pumping problems. By modeling the coarse aggregates as rigid clumps and appropriately defining the contact models, the concrete flow in representative pipeline units is well revealed. Important factors related to the pipe geometry, aggregate geometry and pumping condition were considered during a series of parametric studies. Based on the simulation results, their impact on the local pumping performance is summarized. The present work demonstrates that the discrete element simulation offers a useful way to evaluate the influence of various parameters on the pumpability of fresh concrete.
自密实混凝土和先进泵送系统的使用使得超高层建筑的高效施工成为可能；然而，管道堵塞甚至爆裂等风险仍然存在。为了更详细地了解新拌混凝土的泵送机制，本文采用离散元法对局部泵送问题进行数值模拟。通过将粗骨料建模为刚性团块并适当定义接触模型，很好地揭示了代表性管道单元中的混凝土流动情况。在一系列参数研究中考虑了与管道几何形状、骨料几何形状和泵送条件相关的重要因素。基于模拟结果，总结了它们对局部泵送性能的影响。目前的工作表明，离散元模拟为评估各种参数对新拌混凝土可泵性的影响提供了一种有用的方法。
