Ostrowski Krzysztof, Sadowski Łukasz, Stefaniuk Damian, Wałach Daniel, Gawenda Tomasz, Oleksik Konrad, Usydus Ireneusz
Faculty of Mining and Geoengineering, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Cracow, Poland.
Faculty of Civil Engineering, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland.
Materials (Basel). 2018 Aug 7;11(8):1372. doi: 10.3390/ma11081372.
When understanding the effect of the morphology of coarse aggregate on the properties of a fresh concrete mixture, the strength and deformability of self-compacting high-performance fibre-reinforced concrete (SCHPFRC) can be seen to be critical for its performance. In this research, regular and irregular grains were separated from granite coarse aggregate. The morphology of these grains was described while using digital image analysis. As a result, the aspect ratio, roundness and area ratio were determined in order to better understand this phenomenon. Then, the principal rheological, physical, and mechanical properties of SCHPFRC were determined. The obtained results indicated that the morphology of the grains of coarse aggregate has an impact on the strength and stiffness properties of SCHPFRC. Moreover, significant differences in the transverse strain of concretes were observed. The morphology of the coarse aggregate also has an impact on the rheological parameters of a fresh concrete mixture. To better understand this phenomenon, the hypothesized mechanism of the formation of SCHPFRC caused by different morphology of coarse aggregate was proposed at the end of the article.
在理解粗集料形态对新拌混凝土混合料性能的影响时，自密实高性能纤维增强混凝土（SCHPFRC）的强度和变形能力对其性能至关重要。在本研究中，从花岗岩粗集料中分离出规则和不规则颗粒。利用数字图像分析描述了这些颗粒的形态。结果，确定了长宽比、圆度和面积比，以便更好地理解这一现象。然后，测定了SCHPFRC的主要流变、物理和力学性能。所得结果表明，粗集料颗粒的形态对SCHPFRC的强度和刚度性能有影响。此外，观察到混凝土横向应变存在显著差异。粗集料的形态对新拌混凝土混合料的流变参数也有影响。为了更好地理解这一现象，文章末尾提出了由粗集料不同形态导致的SCHPFRC形成的假设机制。
