钢–聚丙烯纤维混凝土协同增强混凝土力学性能

Synergistic Enhancement of Concrete Mechanical Properties by Steel-Polypropylene Fiber Reinforced Concrete

摘要: 土木工程技术持续升级这一背景里，传统混凝土抗拉强度偏低，韧性不够，容易产生裂缝的固有缺陷，已经很难达到桥梁，隧道这种复杂工程对材料综合性能的严苛要求，金属纤维里面，钢纤维凭借其高强度与高弹性模量的优势，能把混凝土的承载能力与抗冲击性能给提上去，而聚丙烯纤维这类化学纤维质地轻便，耐腐蚀，在阻止混凝土早期微裂缝这一块表现突出，两种纤维借助微观–宏观协同作用形成正向混杂效应，聚丙烯纤维在微观尺度阻断裂缝萌生与扩展，钢纤维则在宏观尺度实现裂缝桥接，二者协同优化混凝土内部孔隙结构与界面粘结性能，明显改善其整体力学性能。

Abstract: Against the background of the continuous upgrading of civil engineering technology, the tensile strength of traditional concrete is low, the toughness is insufficient, and it is easy to produce cracks. It is difficult to meet the strict requirements of bridges and tunnels such as complex engineering for the comprehensive performance of materials. In metal fibers, steel fiber relies on its advantages of high strength and high elastic modulus, it can improve the bearing capacity and impact resistance of concrete, while chemical fibers such as polypropylene fiber are light in texture and corrosion-resistant, which is outstanding in preventing early microcracks of concrete. The two fibers form a positive mixing effect with the help of micro-macroscopic synergy, and polypropylene fiber blocks fractures at the micro scale. Sprouting and expansion, steel fiber realizes crack bridging on a macroscopic scale. The two work together to optimize the internal pore structure and interface bonding performance of concrete, and significantly improve its overall mechanical properties.