Wu Wanrong, Chen Wang, Lu Guoyi, Wang Jiaqian, Tian Guangtian, Xu Boxuan, Deng Chao
College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China.
State Key Laboratory of Key Technologies of Lifting Machinery, ZoomLion, Changsha, 410803, China.
Sci Rep. 2023 Nov 27;13(1):20828. doi: 10.1038/s41598-023-45702-2.
In contrast to traditional approaches to simulating fresh concrete, the model applied here allows issues such as liquid phase and the motion of sub-scale particles to be considered. The rheological behavior of fresh concrete materials was investigated, and the slump test and pumping process of fresh concrete were simulated by combining the smooth particle hydrodynamics coupled with discrete element method. Based on Bi-viscosity model and Bingham model, linear and nonlinear fitting of rheometer data and the derivation equations were educing. Bi-viscosity model and the Bingham model were compared in slump test. The results show that the Bi-viscosity model is more accurate in simulation, and the error percentage is less than 10%. The Bi-viscosity model was used to simulate and predict the results of slump experiment, and the influence of rheological parameters on the slump velocity and shape was obtained. The simulation analysis model of concrete single-cylinder pumping is established, and the experimental and simulation analysis models are compared. The results show that the SPH-DEM pumping pressure prediction is very close to the experimental results.
与传统的模拟新拌混凝土的方法不同，此处应用的模型能够考虑诸如液相和亚尺度颗粒运动等问题。研究了新拌混凝土材料的流变行为，并通过结合光滑粒子流体动力学和离散元方法模拟了新拌混凝土的坍落度试验和泵送过程。基于双黏度模型和宾汉模型，对流变仪数据进行了线性和非线性拟合并推导了方程。在坍落度试验中对双黏度模型和宾汉模型进行了比较。结果表明，双黏度模型在模拟中更准确，误差百分比小于10%。采用双黏度模型模拟和预测坍落度试验结果，得出了流变参数对坍落度速度和形状的影响。建立了混凝土单缸泵送的模拟分析模型，并对试验和模拟分析模型进行了比较。结果表明，光滑粒子流体动力学-离散元法对泵送压力的预测与试验结果非常接近。
