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The rotation speed-torque transformation equation of the Robertson-Stiff model in wide gap coaxial cylinders rheometer and its applications for fresh concrete
Cement & Concrete Composites ( IF 10.5 ) Pub Date : 2020-01-03 , DOI: 10.1016/j.cemconcomp.2020.103511
Yu Liu , Caijun Shi , Qiang Yuan , Xiaopeng An , Lingli Zhu , Bin Wu

The rheological properties of fresh concrete can be characterized by the function between shear rate and shear stress. However, neither shear rate nor shear stress can be measured directly, but transformed from the rotation speed and torque logged by the rheometer. Therefore, the relationship between the rheological model and the torque-rotation speed function needs to be established. In order to describe the nonlinear rheological behavior of fresh concrete, the Robertson-Stiff model was proposed in this paper, and the relationship between rotation speed-torque and rheological parameters measured by the coaxial cylindrical rheometer was derived. Eight concrete mixtures were made, and its rheological properties were tested with ConTec 5 viscometer. Then raw data was utilized to validate the model. The results showed that the Robertson-Stiff model could be used to describe the rheological behavior of fresh concrete.



中文翻译:

大间隙同轴圆柱流变仪中Robertson-Stiff模型的转速-转矩转换方程及其在新拌混凝土中的应用

新鲜混凝土的流变特性可以通过剪切速率和剪切应力之间的函数来表征。但是,剪切速率和剪切应力都无法直接测量,而只能通过流变仪记录的转速和扭矩进行转换。因此,需要建立流变模型与转矩-转速函数之间的关系。为了描述新拌混凝土的非线性流变特性,提出了Robertson-Stiff模型,推导了同轴圆柱流变仪测得的转速-转矩与流变参数之间的关系。制备八种混凝土混合物,并用ConTec 5粘度计测试其流变性。然后利用原始数据来验证模型。

更新日期:2020-01-04
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