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Failure mechanism of fibre reinforced concrete under splitting test using digital image correlation

机译:基于数字图像相关的纤维混凝土劈裂试验的破坏机理

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摘要

The study aims at analysing the fracture mechanism of steel fibre-reinforced concrete in tensile splitting using digital image correlation. The work also aims to exam the influence of both the steel fibre addition and the compressive strength on the behaviour of fibre-reinforced concrete (FRC) in splitting tension test. Cylindrical concrete specimens having 110 mm diameter and 220 mm height were subjected to splitting tests. The cylinders specimens were made with different concrete types and reinforced with steel fibres of two aspect ratios (65 and 80) using three volume fractions (0, 0.5 and 1 %). The types of concretes with various compressive strengths and rheology consisted of an ordinary concrete, a self-compacting concrete and a high strength concrete. The test results revealed the existence of two failure mechanisms; the first one is associated with a central unique crack, whereas the second is related to a secondary cracks initiated at the edges of the test specimens after the main one. Moreover, correlations between the main mechanical properties were developed. The results show that the fibres and the compressive strength of concrete have a significant effect on the behaviour of FRC in splitting. The fibres were more effective in high strength matrix by increasing both the ultimate load and the ductility. This increase, which reached up to 70 %, is attributed to a better quality bond between the steel fibres and the matrix.
机译:该研究旨在利用数字图像相关分析来分析钢纤维增强混凝土在拉伸劈裂中的断裂机理。这项工作还旨在检验钢纤维添加量和抗压强度对分切拉伸试验中纤维增强混凝土(FRC)行为的影响。对直径为110毫米,高度为220毫米的圆柱形混凝土试样进行劈裂测试。圆柱试样由不同的混凝土类型制成,并使用两种体积比(0%,0.5%和1%)的两种长宽比(65和80)的钢纤维增强。具有不同抗压强度和流变性能的混凝土类型包括普通混凝土,自密实混凝土和高强度混凝土。测试结果表明存在两种故障机制。第一个与中央独特裂纹相关,而第二个与主要裂纹之后在试样边缘产生的次要裂纹相关。此外,开发了主要机械性能之间的相关性。结果表明,混凝土的纤维和抗压强度对FRC的劈裂行为有重要影响。通过增加极限载荷和延展性,纤维在高强度基质中更有效。高达70%的这种增加归因于钢纤维和基体之间更好的粘结质量。

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