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Monitoring the service condition of concrete structures requires the quantitative assessment of properties and corrosion rate
of structural steels surrounded by concrete. A multi-cell sensor system that included a reference electrode, a chloride content
sensor, a macrocell current unit and an electrical resistance measurement unit was developed. This system provided the following
important electrochemical data in the cover-zone concrete on site: open circuit potential, macrocell current from anodes to
cathode, chloride profile, concrete resistance and corrosion rate of built-in anodes. The experimental results show that the
macrocell current increases when the chloride content in concrete is higher. Thus, monitoring the chloride content is a good
method for monitoring the corrosion state. The chloride ion content and cover depth are the key factors that affect the electrical
resistance of concrete. Without considering the temperature and time, a simplified model of the instantaneous corrosion rate
of steel rebar in a concrete structure based on the measured chloride contents and concrete resistance was proposed. The test
results further prove the reliability of this simplified predicting model. 相似文献
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瓦斯灾害是煤矿中最严重的灾害之一,瓦斯治理是我国煤矿安全的主攻方向。瓦斯涌出量的预测对遏制矿山瓦斯灾害、保证矿山安全和矿山技术经济指标都有重要意义。传统的方法预测精度不高,而神经网络在构建网络模型时具有一定的主观性。将混沌时间序列理论引入瓦斯预测中,为构建神经网络模型提供理论依据。通过实例证明在实际应用中是可行的。 相似文献
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卢爽 《武汉理工大学学报(材料科学英文版)》2009,(Z1):161-165
A novel Ti/MnO2 reference electrode (TMRE) used for concrete environment was fabricated by the electro-deposition method and encapsulated carefully.The properties of the electrode were characterized by open-circuit potential,potentiodynamic polarization behavior in synthetic concrete pore solutions and electrochemical performance in cement mortar.The experimental results indicate that the TMRE shows good stability with and without the addition of Cl-ions and desirable polarization behavior in synthetic pore solution.Results of tests in cement mortar indicate that the potential of TMRE will be stable after about 7 days.The stability and desirable polarization behavior make it a promising reference electrode for concrete environment. 相似文献
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运用分子自组装技术在铜电极表面分别制备了双水杨醛缩邻苯二胺(简称A)和双邻香兰素缩邻苯二胺(简称B)两种席夫碱缓蚀膜。采用电化学方法研究了两种席夫碱自组装单分子层膜在质量分数3.5%的NaCl溶液中对铜的缓蚀行为。在25 ℃下,席夫碱A溶液浓度为10 mmol/L,组装时间为4 h时缓蚀效果最佳,席夫碱B溶液浓度为15 mmol/L,组装时间为6 h时缓蚀效果最佳,A、B的缓蚀效率分别达到94.06%和96.62%。结果表明,两种缓蚀剂对铜具有很好的缓蚀性能,且缓蚀效果B>A。 相似文献
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