Enhancing interfacial bond performance of steel fibers embedded in ultra-high-performance concrete through surface dezincification and chelation treatments

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-03-22 DOI:10.1016/j.cemconcomp.2025.106062

Lu Ke , Xiulong Wu , Zheng Feng , Chuanxi Li , Doo-Yeol Yoo , Banfu Yan

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Abstract

The flexural and tensile strength of ultra-high-performance concrete (UHPC) depend on the interfacial bond performance between the steel fibers and UHPC matrix. This study proposed a novel dezincification-chelation modification method for steel fibers, leveraging the dezincification effect of brass coating and the adsorption of chelating agents. To investigate the modification mechanisms, efficiency for fibers of varying diameters, and compare improvements, tests were conducted on dezincification, chelation, and dezincification-chelation methods. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) revealed that dezincification exposed the cold-drawn grooves of steel fibers, while chelation refined and expanded these grooves. Atomic force microscopy (AFM) showed that all treatments increased surface roughness, with dezincified-chelated fibers achieving a maximum 21.5-fold increase. All the surface treating methods improved the pullout behavior of the steel fibers, the optimal chelation and dezincification-chelation modification times of 6 h and 9 h, respectively, were independent of fiber size. The average bond strengths of the dezincified and dezincified-chelated short steel fibers increased by 45.3 % and 52.9 %, respectively, and the pullout energy increased by 96.6 % and 53.8 %, respectively, compared to the blank steel fiber. The average bond strengths of the dezincified and dezincified-chelated long steel fibers increased by 46.1 % and 64.3 %, respectively, and the pullout energy increased by 78.5 % and 70.8 %, respectively. Previous studies confirmed our findings that if the improvement in the root mean square roughness of chelated-modified steel fibers should exceed 10.0 times that of untreated steel fibers the pullout performance will decline.

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通过表面脱锌和螯合处理提高超高性能混凝土中嵌入钢纤维的界面结合性能

超高性能混凝土（UHPC）的抗弯和抗拉强度取决于钢纤维与UHPC基体之间的界面粘结性能。本研究利用黄铜涂层的脱锌作用和螯合剂的吸附作用，提出了一种新型的钢纤维脱锌螯合改性方法。为了研究不同直径纤维的改性机理、改性效率，并比较改性效果，对脱锌、螯合和脱锌-螯合方法进行了试验。扫描电镜（SEM）和能谱分析（EDS）表明，脱锌作用使钢纤维的冷拔槽暴露，而螯合作用使钢纤维的冷拔槽细化和扩展。原子力显微镜（AFM）显示，所有处理都增加了表面粗糙度，脱锌螯合纤维最大增加了21.5倍。所有表面处理方法均改善了钢纤维的拉拔性能，最佳的螯合时间为6 h，脱锌-螯合改性时间为9 h，与纤维尺寸无关。与空白钢纤维相比，脱锌短纤维和脱锌螯合短纤维的平均结合强度分别提高了45.3%和52.9%，拔出能分别提高了96.6%和53.8%。脱锌和螯合的长钢纤维的平均结合强度分别提高了46.1%和64.3%，拔出能分别提高了78.5%和70.8%。先前的研究证实了我们的发现，如果螯合改性钢纤维的均方根粗糙度的改善超过未处理钢纤维的10.0倍，则拔出性能会下降。

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.