The feasibility of newly developed abraded arch-type steel fibers as reinforcement in ultra-high-performance concrete (UHPC) is investigated in this study. To this end, twelve abraded arch-type steel fibers with two different curvatures of 0.04/mm and 0.10/mm, three different sandpaper grits of 120, 400, and 800, and two different sanding directions, i.e., longitudinal and transverse, were adopted along with the commercial smooth, straight (plain) steel fiber. To evaluate the effect of surface roughness on the interfacial bond behavior, the surface roughness parameters of plain and abraded steel fibers were quantitatively analyzed with atomic force microscopy. Test results indicate that the surface roughness of plain fiber increased substantially by the sanding process, while smaller grit with coarse particles produced higher roughness on the surface. The abraded arch-type fibers provided better pullout performance than the plain fiber in the same UHPC matrix: the highest bond strengths and energy absorption capacity were approximately two times greater than those of the plain fiber. The higher fiber curvature, smaller sandpaper grit, and longitudinal sanding process were more effective in enhancing the pullout performance of the steel fiber from the UHPC matrix than the counterparts. The abraded arch-type steel fibers generated relatively minor matrix damages during the pulling out process in comparison with conventional deformed steel fibers from the UHPC matrix, thus they can be considered as effective alternatives to the deformed fibers for enhancing the tensile performance of UHPC reinforced with the smooth, straight steel fibers.

在这项研究中研究了新开发的磨拱形钢纤维在超高性能混凝土（UHPC）中的可行性。为此，采用了十二种磨损的弓形钢纤维，其曲率分别为0.04 / mm和0.10 / mm，三种砂纸分别为120、400和800，砂纸方向为纵向和横向，分别为两种。以及商用的光滑，笔直（普通）钢纤维。为了评估表面粗糙度对界面粘结行为的影响，使用原子力显微镜对平整和磨耗钢纤维的表面粗糙度参数进行了定量分析。测试结果表明，普通纤维的表面粗糙度在打磨过程中显着增加，而较小的粗粒颗粒会在表面产生更高的粗糙度。在相同的UHPC基质中，磨光的弓形纤维比普通纤维具有更好的拔出性能：最高的粘结强度和能量吸收能力大约是普通纤维的两倍。较高的纤维曲率，较小的砂纸粒度和纵向打磨工艺比从对应的材料中更有效地增强了从UHPC基质中拉出钢纤维的性能。与常规的UHPC基体变形钢纤维相比，磨砂拱形钢纤维在拔出过程中产生的基体损伤相对较小，因此可以认为它们是变形纤维的有效替代品，可增强UHPC增强UHPC的拉伸性能。顺利