Abstract Coarse aggregates increase inhomogeneity and alter rheological properties of self-compacting concrete. In this work, the effect of coarse aggregates on self-compacting concrete is studied by considering its pipe flow. Self-compacting concrete is modelled as suspension of coarse aggregates in cement mortar and a two-phase Smoothed Particle Hydrodynamics (SPH) model is employed. Cement mortar, a yield-stress fluid, is modelled by fluid SPH particles, while each coarse aggregate is represented by a group of solid SPH particles, which moves as a rigid body. Simulation results show that, at the same volume fractions, the flow rate is higher for larger coarse aggregates, that is up to 24% in the investigated cases. Both effective yield stress and effective plastic viscosity of the concretes increase with the coarse aggregate content. Effective yield stress is smaller for bigger coarse aggregates. The reduction in effective yield stress is a consequence of bigger averaged gap between larger coarse aggregates through which the cement mortar flows.

中文翻译：

---

粗骨料对自密实混凝土流动影响的光滑粒子流体动力学研究

摘要 粗骨料会增加自密实混凝土的不均匀性并改变其流变特性。在这项工作中，粗骨料对自密实混凝土的影响是通过考虑其管流来研究的。自密实混凝土被建模为水泥砂浆中的粗骨料悬浮液，并采用两相平滑粒子流体动力学 (SPH) 模型。水泥砂浆是一种屈服应力流体，由流体 SPH 粒子建模，而每个粗骨料由一组固体 SPH 粒子表示，它们作为刚体移动。模拟结果表明，在相同的体积分数下，较大的粗骨料的流速更高，在调查的情况下高达 24%。混凝土的有效屈服应力和有效塑性粘度都随着粗骨料含量的增加而增加。对于较大的粗骨料，有效屈服应力较小。有效屈服应力的降低是水泥砂浆流过的较大粗骨料之间较大平均间隙的结果。