基于红外感应加热的混凝土钢筋锈蚀检测研究

发布时间：2018-04-29 17:32

本文选题：钢筋混凝土 + 锈蚀　；参考：《重庆交通大学》2014年硕士论文

【摘要】：水工建筑物大多处于比较复杂的工程环境中,而水利工程建筑的使用年限往往是所有建筑物中较长的一类,对于水工建筑来说,钢筋混凝土结构的耐久性研究更为重要,钢筋锈蚀往往是影响其结构耐久性关键的因素之一。在实际工程中,最关注的问题就是对处于服役阶段的结构耐久性的评估,钢筋锈蚀情况是其评判其耐久性的最主要依据。目前钢筋锈蚀的检测方法繁多,但往往准确性不足,很难准确评估水工混凝土结构的锈蚀程度。本文以水工建筑物中混凝土中钢筋锈蚀为研究对象,采用物理模型和数值模拟试验相结合的方式对其进行研究,取得了一定的结论与成果。首先,本文开展了对钢筋混凝土试件的室内加速锈蚀试验,得到锈蚀钢筋试件后,采用红外电磁感应加热锈蚀钢筋的方法来检测钢筋的锈蚀情况。在室内给予氯盐的环境,采用电解的原理,对钢筋进行加速锈蚀以缩短试验的周期,然后应用电磁感应加热,采用红外技术来探测钢筋的锈蚀情况,获取不同锈蚀程度钢筋混凝土表面温度随时间变化的情况。在试验结果的机场,运用ANSYS软件建立钢筋混凝土的钢筋锈蚀仿真模型,来模拟热磁——热耦合场下的锈蚀钢筋在高频电源感应加热情况下的温度变化过程,得出多组工况下钢筋锈蚀因感应加热产生的温度和时间的关系。最后将室内物理模型试验的数据与数值模型的试验数据进行对比研究,对其进行多元线性回归对出加热时间与温度的关系,在此基础上,可通过对现场感应加热中钢筋温度增长速率测量,定量地判定结构中钢筋锈蚀的程度,
[Abstract]:Most hydraulic structures are in more complex engineering environment, and the service life of hydraulic engineering buildings is often the longer type of all buildings. For hydraulic structures, it is more important to study the durability of reinforced concrete structures. Steel bar corrosion is often one of the key factors affecting the durability of the structure. In practical engineering, the most important problem is to evaluate the durability of structures in service, and the corrosion of steel bars is the most important basis for evaluating the durability of structures. At present, there are many methods to detect the corrosion of steel bar, but the accuracy is often insufficient, so it is difficult to accurately evaluate the corrosion degree of hydraulic concrete structure. In this paper, the corrosion of steel bars in concrete in hydraulic structures is taken as the research object. The physical model and numerical simulation tests are used to study the corrosion of steel bars in hydraulic structures, and some conclusions and results have been obtained. First of all, the accelerated corrosion test of reinforced concrete specimens is carried out in this paper. After obtaining the specimens of corroded steel bars, infrared electromagnetic induction heating method is used to detect the corrosion of steel bars. In the environment where chlorine salt is given in the room, the principle of electrolysis is used to accelerate the corrosion of steel bars to shorten the test period, and then electromagnetic induction heating and infrared technology are used to detect the corrosion of steel bars. The change of surface temperature of reinforced concrete with different corrosion degree is obtained. In the airport of test results, the corrosion simulation model of reinforced concrete steel bar is established by using ANSYS software to simulate the temperature change process of corroded steel bar under thermal-magnetic-thermal coupling field under the condition of induction heating with high frequency power supply. The relationship between temperature and time of steel corrosion caused by induction heating under multiple working conditions is obtained. Finally, the experimental data of indoor physical model and numerical model are compared, and the relationship between heating time and temperature is analyzed by multivariate linear regression. The degree of steel bar corrosion in structure can be quantitatively determined by measuring the temperature growth rate of steel bar during field induction heating.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV33

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