海洋环境混凝土结构耐久性原位监测及其机理研究

项目名称： 海洋环境混凝土结构耐久性原位监测及其机理研究

项目编号： No.51272090

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 程新

作者单位： 济南大学

项目金额： 85万元

中文摘要： 海洋混凝土服役环境恶劣，采用智能传感器对其耐久性进行持续监测是评价其服役寿命及保障结构安全运营的重要前提。本项目拟研发适用于海洋环境的埋置式压电传感器，以期有效实现对海洋环境混凝土结构中钢筋腐蚀的原位监测。研究传感器的耐腐蚀性、稳定性和可靠性，获得谐振频率、频带宽度、灵敏度、频率响应及阻抗频率特性等参数，优化传感器的制备工艺；模拟海洋环境下氯离子侵蚀，将传感器埋入钢筋混凝土结构中，采用应力波传播和机电阻抗技术，研究氯离子扩散、边界条件及环境条件变化等对传感器接收的超声波、声发射波及机电阻抗特征参数的影响规律，明确钢筋腐蚀速率、程度与不同特征参数间的相关性，获得各特征参数与钢筋腐蚀损伤之间的定量关系；揭示多场耦合作用下的钢筋腐蚀机制及基于压电传感器的钢筋腐蚀监测机理，建立反映钢筋腐蚀程度的损伤量化指标，为海洋环境下混凝土结构耐久性的智能监测与评估提供理论和应用依据。

中文关键词： 水泥；混凝土；钢筋锈蚀；压电；监测

英文摘要： The continued durability monitoring of concrete in bad marine environment by using intelligent sensor is important to guarantee the safety of concrete structure. This project aims at developing embedded piezoelectric sensor which is suitable for marine environment to realize the in-situ corrosion monitoring of steel bar in marine environment concrete. The corrosion resistance, stability and reliability will be studied as well as the performance parameters of the sensor, such as resonance frequency, frequency band, sensitivity, frequency response and impedance-frequency feature etc. The fabrication technique of the sensor will also be optimized. The sensor will be embedded into the reinforced concrete structure and the chloride ion penetration in marine environment concrete will also be simulated. Based on stress wave propagation and electromechanical impedance technology, the influences of chloride diffusion, boundary condition and variation of environment condition on receiving ultrasonic wave, acoustic emitting wave and electromechanical impedance characteristic parameters will be studied, and the correlation between corrosion rate, extent of steel bar and kinds of characteristic parameter will also be cleared. The quantitative relationship between kinds of parameters and corrosion damage of steel bar will be

英文关键词： cement；concrete；steel corrosion；piezoelectric；monitoring