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Feasibility of Reducing the Fiber Content in Ultra-High-Performance Fiber-Reinforced Concrete under Flexure

机译:降低挠曲下超高性能纤维增强混凝土中纤维含量的可行性

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In this study, the flexural behavior of ultra-high-performance fiber-reinforced concrete (UHPFRC) is examined as a function of fiber length and volume fraction. Straight steel fiber with three different lengths ( l f ) of 13, 19.5, and 30 mm and four different volume fractions ( v f ) of 0.5%, 1.0%, 1.5%, and 2.0% are considered. Test results show that post-cracking flexural properties of UHPFRC, such as flexural strength, deflection capacity, toughness, and cracking behavior, improve with increasing fiber length and volume fraction, while first-cracking properties are not significantly influenced by fiber length and volume fraction. A 0.5 vol % reduction of steel fiber content relative to commercial UHPFRC can be achieved without deterioration of flexural performance by replacing short fibers ( l f of 13 mm) with longer fibers ( l f of 19.5 mm and 30 mm).
机译:在这项研究中,研究了超高性能纤维增强混凝土(UHPFRC)的弯曲行为与纤维长度和体积分数的关系。考虑具有13、19.5和30 mm的三种不同长度(l f)和0.5%,1.0%,1.5%和2.0%的四种不同体积分数(v f)的直钢纤维。测试结果表明,随着纤维长度和体积分数的增加,UHPFRC的开裂后挠曲性能(例如挠曲强度,挠曲能力,韧性和开裂行为)会改善,而初裂性能不受纤维长度和体积分数的影响。通过用较长的纤维(19.5 mm和30 mm的纤维)代替较短的纤维(13 f的纤维),可以使钢纤维含量相对于商用UHPFRC降低0.5 vol%,而不会降低挠曲性能。

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