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The effect of steel fiber on the bond between concrete and deformed steel bar in SFRCs

机译：钢纤维对SFRC中混凝土与变形钢筋粘结的影响

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In this study, the effect of steel fiber amount and concrete cover on concrete deformed steel bar bond of steel fiber concretes (SFRCs) has been investigated. Steel fibers with l/d ratios of 60 and 80 were added to the concretes designed in C20, C40 and C60 classes in 10, 20, 30, 40, 60 and 80 kg/m~3 amounts. S420 deformed steel bars with 14 mm diameter were embedded at 70 mm bond length to cubic specimens prepared from the concretes produced with and without steel fiber enabling the concrete cover to be 40, 55 and 70 mm. The specimens were subjected to pullout test. Moreover, 28-day mechanical tests of the concretes produced were defined. As a result of the studies conducted, the pullout loads are found to increase by 7-16% when the amount of steel fibers and aspect ratio in the SFRCs produced increase when compared to concretes without steel fiber. In addition, the concrete reinforcement bond was mathematically modeled using 28-day mechanical properties of the concretes and the concrete covers.
机译：在这项研究中，研究了钢纤维量和混凝土覆盖层对钢纤维混凝土的混凝土变形钢筋粘结的影响。将l / d比为60和80的钢纤维以10、20、30、40、60和80 kg / m〜3的量添加到C20，C40和C60类设计的混凝土中。将S420变形的直径为14 mm的钢筋以70 mm的粘结长度嵌入到立方标本中，该标本由使用和不使用钢纤维生产的混凝土制备而成，混凝土覆盖层的厚度分别为40、55和70 mm。对样品进行拉拔测试。此外，对所生产的混凝土进行了28天的机械测试。进行研究的结果是，与不含钢纤维的混凝土相比，当生产的SFRC中钢纤维的数量和长宽比增加时，拉拔载荷将增加7-16％。此外，使用28天的混凝土和混凝土保护层力学性能对混凝土钢筋粘结进行数学建模。

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