A new steel fiber reinforced concrete (SFRC) structure is proposed to improve the bond performance between steel rebars and concrete by aligning the limited steel fibers closely around the magnetized rebar, which is achievable to have both adequate steel fibers around rebar for high steel-concrete bonding and appropriate fiber content for good fluidity of concrete. An experimental test is performed to verify the effectiveness of the new structure. 41 specimens are designed and subjected to pull-out test to observe the effects of rebar magnetization, concrete consolidating condition and steel fiber content on bond behavior between steel rebars and SFRC. Results verify the positive effects of the new structure on bond behavior under the suitable conditions. Steel fibers can be aligned closely around the magnetized steel rebar and consequently increase bond behavior. In the present test, the average increments of bond strength are 28.2% and 20.8% for pull-out and splitting specimens as the magnetization intensity increased form 0 mT–30 mT, respectively. The maximum increment is up to 50.0%. Steel fiber shows dual roles to bond strength since it increases the concrete strength with deteriorated fluidity. The recommended content of steel fiber is about 0.25%–0.75% for the proposed structure. And, self-consolidating concrete with good fluidity is required for the movement of steel fiber under the attracted force from the magnetized rebar.

提出了一种新的钢纤维增强混凝土（SFRC）结构，通过将有限的钢纤维紧贴在磁化的钢筋周围来改善钢筋与混凝土之间的粘结性能，这可以实现在钢筋周围具有足够的钢纤维以用于高钢筋混凝土粘结和适当的纤维含量，以实现混凝土的良好流动性。进行了实验测试以验证新结构的有效性。设计了41个试样并进行了拉拔试验，以观察钢筋磁化强度，混凝土固结条件和钢纤维含量对钢筋与SFRC之间粘结性能的影响。结果证明了在适当条件下新结构对键合行为的积极影响。钢纤维可以在磁化的钢筋周围紧密对齐，从而提高粘结性能。在本测试中，随着磁化强度从0 mT–30 mT分别增加，拉出和劈裂试样的粘结强度平均增加分别为28.2％和20.8％。最大增量为50.0％。钢纤维对粘结强度具有双重作用，因为它可以增加混凝土强度并降低流动性。对于建议的结构，建议的钢纤维含量约为0.25％–0.75％。并且，在磁化钢筋的吸引力作用下，钢纤维的运动需要具有良好流动性的自固结混凝土。当磁化强度从0 mT–30 mT分别增加时，拔出和劈裂样品的8％。最大增量为50.0％。钢纤维对粘结强度具有双重作用，因为它可以增加混凝土强度并降低流动性。对于建议的结构，建议的钢纤维含量约为0.25％–0.75％。并且，在磁化钢筋的吸引力作用下，钢纤维的运动需要具有良好流动性的自固结混凝土。当磁化强度从0 mT–30 mT分别增加时，拔出和劈裂样品的8％。最大增量为50.0％。钢纤维对粘结强度具有双重作用，因为它可以增加混凝土强度并降低流动性。对于建议的结构，建议的钢纤维含量约为0.25％–0.75％。并且，在磁化钢筋的吸引力作用下，钢纤维的运动需要具有良好流动性的自固结混凝土。