Mechanical properties of steel fiber reinforced concrete (SFRC) mixed with NaCl solutions of varying concentrations

作者：Ying Li, Xiangzhe Kong, Zhudi Cao, Lin Yang, Wenda Xu, Danying Gao · 发表于：Case Studies in Construction Materials · 年份：2025 · DOI：10.1016/j.cscm.2025.e05389 · 被引用次数：2 · 研究领域：Innovative concrete reinforcement materials、Concrete and Cement Materials Research、Recycled Aggregate Concrete Performance

Steel fiber reinforced concrete (SFRC) specimens were prepared using NaCl solutions of varying concentrations (0, 3, 6, and 9 wt%) as mixing water. Over a 14-month exposure period in a high-humidity environment (RH≥95%), the cubic compressive strength, flexural properties and splitting-tensile properties of SFRC were monitored. Results demonstrated that the steel fibers inside concrete were hardly corroded, and only a few rust spots were found on the surface of specimens. The mechanical properties of chloride-mixed SFRC did not decrease but instead improved after 14 months of exposure. In which, the compressive strength increased by 15.5%, the flexural toughness improved by 10.6–20.7%, and the splitting-tensile strength rose by 12.9–23.8%. SFRC demonstrated exceptional chloride tolerance, maintaining mechanical integrity with NaCl solutions as mixing water. The results validated the technical viability of seawater-mixed SFRC for marine infrastructure, eliminating freshwater dependency while ensuring the durability.