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Experimental investigation on mechanical properties of Hybrid Fibre Reinforced Concrete

机译：混杂纤维混凝土力学性能的试验研究。

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In order to improve the work behaviour of Plain Concrete (PC) of the shear keys in the immersed tunnel, a series of test programs consisting of direct shear, four points flexure, uniaxial tensile, uniaxial compression and splitting tensile tests were carried out to find the optimized mixture proportion of the fibres in Hybrid Fibre Reinforced Concretes (HFRC). The optimized unit weight of the hybrid fibres was obtained through the parametric studies on the improvements of different fibre contents on the mechanical properties of the HFRC, especially the shear strength and toughness. Additionally, the influences of incorporating hybrid fibres on flexure, direct shear toughness and residual load were also studied. The direct shear strength, shear toughness and residual shear load significantly increased due to the addition of steel fibres and basalt fibres. Through extensive experimental studies, the comparisons of the mechanical properties of the HFRC with different fibre content revealed that group C2 containing 180 kg/m(3) steel fibres and 4.5 kg/m(3) basalt fibres performed the best in terms of shear strength and toughness. The contributions of different types of fibres to the mechanical properties of HFRC were also investigated. The observations from the tests offer a practical guidance to concrete composites designers on the shear strength and shear deformation ability of different structures, especially for use in constructing the shear keys of an immersed tunnel. (C) 2017 Elsevier Ltd. All rights reserved.
机译：为了改善沉水隧道中剪切键的普通混凝土工作性能，进行了一系列试验程序，包括直接剪切，四点弯曲，单轴拉伸，单轴压缩，劈裂拉伸测试。混合纤维增强混凝土（HFRC）中纤维的最佳混合比例。通过对不同纤维含量对HFRC力学性能（尤其是剪切强度和韧性）进行改进的参数研究，获得了杂化纤维的最佳单位重量。此外，还研究了混合纤维对弯曲，直接剪切韧性和残余载荷的影响。由于添加了钢纤维和玄武岩纤维，直接剪切强度，剪切韧性和残余剪切载荷显着增加。通过广泛的实验研究，比较了不同纤维含量的HFRC的机械性能，发现C2组含有180 kg / m（3）的钢纤维和4.5 kg / m（3）的玄武岩纤维在剪切强度方面表现最佳和韧性。还研究了不同类型的纤维对HFRC力学性能的贡献。测试的观察结果为混凝土复合材料设计人员提供了有关不同结构的抗剪强度和剪切变形能力的实用指南，特别是用于构造沉管隧道的抗剪键。 （C）2017 Elsevier Ltd.保留所有权利。

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