自密实混凝土流变特性的精确评价（英文）

Accurate Estimation of Rheological Properties of Self-compacting Concrete

阐述了如何准确评价自密实混凝土的流变性能,屈服应力和塑性黏度。当前,混凝土的流变性能主要是通过流变仪测定。然而,由于不同的混凝土流变仪所测得的数据存在一定的差异,造成测试结果不完全可靠。这是由于自密实混凝土拌合物体系的不均匀性。为了对自密实混凝土流变性能进行可靠的评估,从均质黏性浆体和混凝土组成出发,通过微观力学方法对不均质混合体的塑性黏度进行了评估。另外,通过测定混凝土t_(500)和流体扩展度来评估屈服应力的大小,通过三维锥形流光滑粒子流体动力学方法评价流体扩展度。

We describe how the rheological properties of self-compacting concrete （SCC）, namely its yield stress and plastic viscosity can be accurately estimated. Currently these properties are measured using a rheometer, but these measurements are unreliable because they are very different depending on the rheometer used. This is to do with the heterogeneous nature of the SCC mix. To get a reliable estimate of these properties, a micromechanical procedure is described for estimating the plastic viscosity of the heterogeneous mix from the plastic viscosity of the homogeneous viscous paste and the mix composition. The yield stress on the other hand is estimated in an inverse manner from the measured ts0o and flow spread of the mix in a cone flow test using the three-dimensional smooth particle hydrodynamics （SPH） method for simulating the flow of SCC.