Soares Junior Paulo Roberto Ribeiro, Maciel Priscila Souza, Barreto Richard Rodrigues, Silva Neto João Trajano da, Siqueira Corrêa Elaine Carballo, Bezerra Augusto Cesar da Silva
Department of Materials Engineering, Federal Center for Technological Education of Minas Gerais, Belo Horizonte 30421-169, Brazil.
Department of Transports Engineering, Federal Center for Technological Education of Minas Gerais, Belo Horizonte 30421-169, Brazil.
Materials (Basel). 2019 Oct 11;12(20):3297. doi: 10.3390/ma12203297.
The present study evaluated the mechanical behaviour of thin high-performance cementitious composite slabs reinforced with short steel fibres. For this purpose, slabs with 1%, 3% and 5% vol. of steel fibres were moulded using the slurry infiltration method. Fibres concentrated in the region subjected to traction during bending stresses. After curing for 28 days, all slabs underwent flexural testing. The slabs with 5% fibre showed significantly higher flexural strength, deflection and toughness compared to those of the control group without reinforcement. The dense fibre distribution, resulting from the production process, led to profiles with multiple random cracks in the region of failure of the slabs as the fibre content increased. The results of the statistical analysis showed the intensity of the correlation between the variables and revealed that the increase of the fibre content significantly influenced the parameters of mechanical behaviour (load, flexural strength, deflection, toughness and toughness factor). Images obtained by optical microscopy aided in understanding the fibre-matrix interface, showing the bonding surface between the constituents of the composite.
本研究评估了用短钢纤维增强的薄高性能水泥基复合板的力学性能。为此，采用浆料渗透法制作了钢纤维体积分数为1%、3%和5%的板。纤维集中在弯曲应力作用下受拉的区域。养护28天后，所有板均进行了弯曲试验。与未增强的对照组相比，含5%纤维的板显示出显著更高的弯曲强度、挠度和韧性。生产过程导致的密集纤维分布，随着纤维含量的增加，在板的破坏区域产生了具有多个随机裂缝的剖面。统计分析结果显示了变量之间的相关强度，并表明纤维含量的增加显著影响了力学性能参数（荷载、弯曲强度、挠度、韧性和韧性因子）。通过光学显微镜获得的图像有助于理解纤维-基体界面，显示了复合材料各组分之间的结合表面。
