轨道交通杂散电流腐蚀对混凝土基本力学性能的影响

发布时间：2024-06-14 20:27

　　轨道交通能够大幅缓解交通压力、带动国民经济快速发展。杂散电流是以走行轨为回流线的电气化轨道交通难以避免的现实问题。杂散电流能够对下部钢筋混凝土构件和结构等产生腐蚀。与自然自然腐蚀不同,杂散电流腐蚀中的绝大部分属腐蚀电化学非线性系统范畴,腐蚀速率可达自然腐蚀的数倍甚至百倍,,因此杂散电流腐蚀是列车的运营安全的潜在威胁之一。本文针对杂散电流作用对混凝土抗压、抗折和疲劳三种基本力学性能的影响展开研究。(接下来主要谈控制哪些试验条件、做了多少混凝土试样、进行了哪些试验研究等试验设计方面的内容)主要研究目的是研究压缩混凝土时恒定电流强度的影响,混凝土弯曲强度和混凝土压缩疲劳强度时的变化。为了进行研究,在实验室条件下创建了与实际情况类似的条件,其中具体在外部直流电的影响下进行测试。在这些条件下,混凝土长时间暴露于电场和机械载荷。为了确定混凝土电场的强度,我们使用了两个主要因素-电流作用在混凝土上的电流和电场暴露于混凝土的时间。混凝土弯曲和压缩试验每个月通过三个月。疲劳试验在研究开始三个月后进行。(本段要给出通过试验研究,在抗压、抗折和疲劳三方面内容上,得到的主要结论)随着供应给混凝土的电力电压的增...

【文章页数】：89 页

【学位级别】：硕士

【文章目录】：
摘要
Abstract
Chapter 1 Introduction
    1.1 Research Background
    1.2 Objectives and Significance of the Research
        1.2.1 Objectives of the Research
        1.2.2 Stray Current Corrosion Risk
        1.2.3 Significance of the Research
    1.3 Literature Review
    1.4 Main Research Content and Basic Study Method
        1.4.1 Main Research Content
        1.4.2 Basic Study Method
Chapter 2 Corrosion Mechanism of the Reinforcement Caused by the Stray Current
    2.1 Introduction of Chapter
    2.2 Electrochemical Corrosion Mechanism of Reinforced Concrete Structures
    2.3 Corrosion Mechanism of Stray Current in Reinforced Concrete Structures
    2.4 Summary of the Chapter
Chapter 3 Raw Materials and Experimental Methods
    3.1 Introduction of Chapter
    3.2 The Materials Used
        3.2.1 Determination of Crushing Index of Crushed Stone
        3.2.2 Determination of Apparent Density of Gravel and Sand
        3.2.3 Determination of Concrete Slump
        3.2.4 Preparation of Electrode in Concrete Specimen
        3.2.5 Plexiglass Mold
    3.3 Production of Concrete Samples
    3.4 Control of Experimental Conditions for Concrete Specimen
    3.5 Creation of an Electric Field
    3.6 Summary of the Chapter
Chapter 4 Determination of Mechanical Properties of Concrete
    4.1 Introduction of Chapter
    4.2 Change Mass of Metal Plates
    4.3 Investigations of the Effect of Electric Current on Compressive Strength of Concrete
        4.3.1 Compression Test Conditions and Test Procedure
        4.3.2 Results and Description Results of Compression Test
    4.4 Investigations of the Effect of Electric Current on Bending Strength of Concrete
        4.4.1 Bending Test Conditions and Test Procedure
        4.4.2 Results and Discussion of Bending Test
    4.5 Fatigue Test
        4.5.1 Fatigue Test Conditions and Test Procedure
        4.5.2 Results and Discussion of Fatigue Test
    4.6 Summary of the Chapter
Conclusion
References
Acknowledgements
Resume



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