Effect of Polyethylene and Steel Fibers on the Fracture Behavior of Coral Sand Ultra-High Performance Concrete

作者：Hongwei Han, Xue Xiao, Dongxu Hou, Wei Li, Hao Han, Yudong Han · 发表于：Journal of Composites Science · 年份：2025 · DOI：10.3390/jcs9090493 · 被引用次数：3 · 研究领域：Innovative concrete reinforcement materials、Structural Behavior of Reinforced Concrete、Fire effects on concrete materials

As a representative high-performance construction material, ultra-high performance concrete (UHPC) is typically prepared using quartz sand and steel fibers. To alleviate the shortage of building materials in island and reef regions, this study employs coral sand for UHPC preparation and investigates the effects of different fibers on its mechanical properties. This study demonstrates that this approach mitigates brittle failure patterns and enhances the durability of structures. To investigate the enhancement effects of PE and steel fibers on the mechanical properties of coral sand ultra-high performance concrete (CSUHPC), 12 mix designs were formulated, including a plain (no fiber) reference group and PE fiber-reinforced, steel fiber-reinforced, and hybrid fiber combinations. Compressive tests, tensile tests, and three-point bending tests on pre-notched beams were conducted. Key parameters such as 28-day compressive strength, tensile strength, and flexural strength and toughness were measured. A multi-criteria evaluation framework was established to comprehensively assess the integrated performance of each group. The experimental results demonstrated that fiber incorporation significantly enhanced the compressive strength and fracture properties of CSUHPC compared to the plain reference group. Steel fiber-only reinforcement exhibited the most pronounced improvement in compressive strength and fracture properties, while hybrid fiber combinations provided superior tensile perf...