Mina Anna L, Trezos Konstantinos G, Petrou Michael F
Laboratory of Reinforced Concrete, School of Civil Engineering, National Technical University of Athens, 5 Iroon Polytechniou Street, 15773 Zografou, Greece.
Department of Civil and Environmental Engineering, University of Cyprus, 75 Kallipoleos Avenue, P.O. Box 20537, Nicosia 1678, Cyprus.
Materials (Basel). 2021 Sep 6;14(17):5098. doi: 10.3390/ma14175098.
This study describes an extensive experimental investigation of various mechanical properties of Ultra-High-Performance Fibre-Reinforced Concrete (UHPFRC). The scope is to achieve high strength and ductile behaviour, hence providing optimal resistance to projectile impact. Eight different mixtures were produced and tested, three mixtures of Ultra-High-Performance Concrete (UHPC) and five mixtures of UHPFRC, by changing the amount and length of the steel fibres, the quantity of the superplasticizer, and the water to binder (/) ratio. Full stress-strain curves from compression, direct tension, and flexural tests were obtained from one batch of each mixture to examine the influence of the above parameters on the mechanical properties. The Poisson's ratio and modulus of elasticity in compression and direct tension were measured. Additionally, a factor was determined to convert the cubic strength to cylindrical. Based on the test results, the mixture with high volume (6%) and a combination of two lengths of steel fibres (3% each), water to binder ratio of 0.16% and 6.1% of superplasticizer to binder ratio exhibited the highest strength and presented great deformability in the plastic region. A numerical simulation developed using ABAQUS was capable of capturing very well the experimental three-point bending response of the UHPFRC best-performed mixture.
本研究描述了对超高性能纤维增强混凝土（UHPFRC）各种力学性能的广泛实验研究。其目的是实现高强度和延性行为，从而提供对弹丸冲击的最佳抵抗力。通过改变钢纤维的数量和长度、高效减水剂的用量以及水胶比，制备并测试了八种不同的混合料，其中包括三种超高性能混凝土（UHPC）混合料和五种UHPFRC混合料。从每种混合料的一批试件中获取了压缩、直接拉伸和弯曲试验的完整应力-应变曲线，以研究上述参数对力学性能的影响。测量了泊松比以及压缩和直接拉伸时的弹性模量。此外，还确定了一个将立方体强度转换为圆柱体强度的系数。基于试验结果，体积分数为6%且包含两种长度（各3%）钢纤维、水胶比为0.16%以及高效减水剂与胶凝材料之比为6.1%的混合料表现出最高强度，并且在塑性区域具有很大的变形能力。使用ABAQUS进行的数值模拟能够很好地捕捉UHPFRC性能最佳混合料的试验三点弯曲响应。
