摘要
本文旨在探讨冻融循环与氯盐侵蚀耦合作用对混凝土物理力学性能的影响,揭示其劣化机制,并基于冻融循环与氯盐侵蚀的相互作用机理,设计了系统的冻融-氯盐侵蚀试验方案。在试验过程中,观察了混凝土的外观变化、质量损失,测试了不同冻融循环次数下混凝土的抗压强度与超声波传播速度。结果表明:随着冻融循环次数的增加,混凝土的抗压强度显著下降,经过150次冻融循环后,混凝土的抗压强度从41.2 MPa降低至34.7 MPa,损失率达到15.8%,且混凝土外观形态发生明显劣化,质量也随着循环次数的增加而逐渐下降。该研究为深入理解冻融-氯盐耦合侵蚀对混凝土性能的影响规律、评估混凝土的耐久性能及优化其抗冻融设计提供了理论依据和数据支持。
This study investigates the impact of the coupled action of freeze-thaw cycles and chloride salt erosion on the physical and mechanical properties of concrete,revealing its deterioration mechanism.Based on the interaction mechanism between freeze-thaw cycles and chloride salt erosion,a systematic freeze-thaw and chloride salt erosion test scheme is designed.During the testing process,the visual changes and mass loss of concrete are observed,and its compressive strength and ultrasonic pulse velocity are measured at different numbers of freeze-thaw cycles.The results indicate that as the number of freeze-thaw cycles increases,the compressive strength of concrete decreases significantly.After 150 freeze-thaw cycles,its compressive strength decreases from 41.2 MPa to 34.7 MPa,representing a loss rate of 15.8%.Concurrently,the concrete exhibited obvious visual deterioration,along with a progressive mass loss.This research provides theoretical foundations and data support for a deeper understanding of the influence patterns of coupled freeze-thaw and chloride salt erosion on concrete performance,the assessment of concrete durability,and the optimization of its frost-resistant design.
出处
《混凝土世界》
2025年第9期42-45,共4页
China Concrete
关键词
冻融循环
钢筋锈蚀
劣化机制
耐久性能
Freeze-thaw cycles
reinforcement corrosion
deterioration mechanism
durability
