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
Lu Ke , Xiulong Wu , Zheng Feng , Chuanxi Li , Doo-Yeol Yoo , Banfu Yan
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引用次数: 0
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.
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.