The mixing process performs a critical role in the concrete microstructure, which defines the final product’s quality. Optimizing mixing time and mixing speed during the mixing process can reduce the unit price and energy consumption without impacting product quality. Furthermore, the energy consumption to manufacture self-consolidating concretes (SCC) is more than that of conventional concretes due to their compositions and structures. Due to the fact that rheological and mechanical properties assess the performance of concrete, the effects of mixing energy on the mentioned properties of self-consolidating concretes are taken into consideration simultaneously in the current investigation. Accordingly, different mixtures contained polysaccharide-based viscosity modifying agent and limestone powder are made under different mixing speeds and mixing times. Drawing on the results of mixing time, the optimum time for mixing is 8 min in this study in order to improve the workability and to provide ideal levels of rheological features such as minimum yield stresses (static and dynamic). In the aspect of mixing speed, double increasing from 20 to 40 rpm rises the slump flow by 5%. Besides, accelerating mixing speed increases dynamic yield stress by 37% for 11 min mixed mixtures, which is more than that of other mixing times mixtures’ dynamic yield stress increment. In the aspect of mechanical properties, mixing time increment increases the concrete’s compressive strength. Nevertheless, other mechanical characteristic criteria do not significantly depend on mixing energy.

中文翻译：

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研究搅拌时间和搅拌速度对自密实混凝土的流变性能、和易性和机械性能的影响

混合过程在混凝土微观结构中起着关键作用，它决定了最终产品的质量。在混合过程中优化混合时间和混合速度，可以在不影响产品质量的情况下降低单价和能耗。此外，由于其成分和结构，制造自密实混凝土 (SCC) 的能耗高于传统混凝土。由于流变学和力学性能评估混凝土的性能，因此在当前的调查中同时考虑了混合能量对自密实混凝土的上述性能的影响。因此，含有多糖基粘度调节剂和石灰石粉的不同混合物在不同的混合速度和混合时间下制成。根据混合时间的结果，本研究中的最佳混合时间为 8 分钟，以提高和易性并提供理想水平的流变特性，例如最小屈服应力（静态和动态）。在搅拌速度方面，从20转40转一倍，坍落度提高5%。此外，加快混合速度使混合11 min 混合料的动态屈服应力增加37%，高于其他混合时间混合料的动态屈服应力增量。在力学性能方面，随着搅拌时间的增加，混凝土的抗压强度增加。尽管如此，