输电线路铁塔基础结构钢筋锈蚀参数监测分析
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摘要
输电线路铁塔基础结构钢筋锈蚀是影响整条输电线路正常运行的关键问题,引起基础结构钢筋锈蚀的因素很多,主要有PH值、Cl~-浓度及氧气含量等。针对广东茂名地区的输电线路,采用监测设备对输电线路铁塔基础结构的地下环境参数进行了监测。监测结果表明:PH值为弱碱性、Cl~-浓度偏大等,在有氧气的地下环境中,铁塔基础结构易发生锈蚀。
The corrosions of the steel reinforcement bars in foundation of power transmission tower structures is one of the key factors that affecting the safe operation of power transmission lines. Among many potential factors, electrochemical properties such as, pH value, Cl concentration and oxygen content are factors that might induce the corrosion of the steel reinforcement bars. This paper presents a case history of corrosion monitoring of the subsurface environmental conditions for the steel reinforcement bars in foundation of power transmission towers in Maoming area. The monitoring results indicated that, the power transmission towers are located in the coastal area so that the pH is slightly alkane and chloride content is high, corrosion of the steel reinforcement bars was observed under the oxygen rich environments.
The corrosions of the steel reinforcement bars in foundation of power transmission tower structures is one of the key factors that affecting the safe operation of power transmission lines. Among many potential factors, electrochemical properties such as, pH value, Cl concentration and oxygen content are factors that might induce the corrosion of the steel reinforcement bars. This paper presents a case history of corrosion monitoring of the subsurface environmental conditions for the steel reinforcement bars in foundation of power transmission towers in Maoming area. The monitoring results indicated that, the power transmission towers are located in the coastal area so that the pH is slightly alkane and chloride content is high, corrosion of the steel reinforcement bars was observed under the oxygen rich environments.
引文
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[3] JOHN E. SLATER. Corrosion of metals in Association with Concrete [M]. Philadelphia:ASTM SPECIAL TECHNICAL PUBLICATION, 1983.
[4] 贡金鑫,赵国藩.钢筋混凝土结构耐久性研究的进展[J].工业建筑,2000,30(5):1-5.
[5] 马红岩,邢锋,董必钦,等.海砂混凝土中钢筋锈蚀特性的电化学表征研究[J].混凝土,2007(7):20-23.
[6] 谢燕,吴笑梅,樊粤明,等.内掺氯离子对钢筋锈蚀的影响及不同材料对氯离子的固化[J].华南理工大学学报:自然科学版,2009,37(8):132-139.
[7] 赵炜璇,巴恒静.含氧量对临界氯离子浓度及钢筋锈蚀速率影响[J].中国矿业大学学报,2011,40(5):714-719.
[8] 马孝轩,仇新刚,孙秀武.钢筋混凝土桩在沿海地区腐蚀规律试验研究[J].混凝土与水泥制品,2002(1):23-24.
[9] 顾明亮,丁永辉.沿海区段输电线路铁塔及基础防腐分析[J].山西建筑,2007,33(35):151-152.
[10] 朱小丹.气体在土体中的运移规律初步研究[D].东南大学,2012.
[11] 宫鹏.钢筋混凝土构件锈蚀的光纤监测技术与锈胀的评定方法[D].大连理工大学,2012.
[12] 杨彪.旧有输电铁塔混凝土基础主柱老化损伤修复研究[D].中国矿业大学,2017.
[13] 混凝土质量标准控制(GB50164—2011)[S].
[14] 王龙胜.海洋环境下既有桩基耐久性评估研究[D].青岛理工大学,2016.
[15] 耿欧.混凝土氧气扩散性能的预测模型[J].中国矿业大学学报,2010,39(4):471-474.
[16] 110—500 kV架空电力线路施工及验收规范(GB50233—2005)[S].