钢纤维增强橡胶混凝土长期性能与环境适应性研究

Research on the Long-Term Performance and Environmental Adaptability of Steel Fiber Reinforced Rubber Concrete

摘要: 本论文聚焦钢纤维增强橡胶混凝土在长期服役过程中的性能演变与环境适应性，通过开展干湿循环、碳化、氯离子侵蚀、超低温冻融及盐雾腐蚀等系列加速老化试验，系统研究混凝土在不同环境作用下的抗压、抗拉强度衰减规律，揭示钢纤维锈蚀对混凝土性能的影响机制，并分析橡胶掺量对钢纤维锈蚀的抑制作用。结果表明，适量钢纤维(1.0%~1.5%)与橡胶(5%~10%)掺量可显著提升混凝土在极端环境下的耐久性，其氯离子渗透深度较基准混凝土降低40%，−40℃超低温冻融500次后抗压强度保持率达75%。本研究为钢纤维增强橡胶混凝土在复杂环境道路工程中的应用提供了理论依据与数据支撑。

Abstract: This thesis focuses on the performance evolution and environmental adaptability of steel fiber reinforced rubber concrete during its long-term service. By conducting a series of accelerated aging tests such as dry-wet cycling, carbonation, chloride ion erosion, ultra-low temperature freeze-thaw and salt spray corrosion, it systematically studies the attenuation laws of compressive and tensile strength of concrete under different environmental effects. We establish a life prediction model based on time-varying parameters to reveal the influence mechanism of steel fiber corrosion on the performance of concrete, and analyze the inhibitory effect of rubber dosage on steel fiber corrosion. The results show that an appropriate dosage of steel fiber (1.0%~1.5%) and rubber (5%~10%) can significantly enhance the durability of concrete in extreme environments. The chloride ion penetration depth is 40% lower than that of the benchmark concrete, and the compressive strength retention rate reaches 75% after 500 freeze-thaw cycles at −40˚C. This research provides a theoretical basis and data support for the application of steel fiber reinforced rubber concrete in road engineering in complex environments.