红外热像法在水工混凝土裂缝检测中的应用研究

发布时间：2018-03-26 13:46

本文选题：混凝土裂缝　切入点：红外热成像法　出处：《重庆交通大学》2017年硕士论文

【摘要】：混凝土材料具有强度高、造价低廉、施工方便及就地取材等优点被广泛运用于水利工程建设中。然而在水泥水化热、外荷载以及自然灾害等因素的影响下,混凝土表面及内部极易产生裂缝。尤其对于水工混凝土,裂缝的产生将在不同程度上影响结构的整体性及耐久性,严重时还会影响到结构的承载能力,引起工程事故。因此,寻找一种有效的无损检测方法检测混凝土中裂缝的位置及尺寸,对水利工程质量评估提供参考具有重要意义。基于此,本文采用红外热像法对混凝土内部裂缝进行检测,主要开展了以下研究工作:(1)介绍混凝土无损检测方法、红外热成像无损检测技术的应用与研究现状。在现有的混凝土裂缝无损检测方法的基础上,将红外热像法引用出来,并应用到混凝土裂缝检测当中,然后阐述红外热成像无损检测相关理论、感应加热理论。(2)采用基于辐射热源的红外热像法检测混凝土内部裂缝。选用远红外石英加热板和太阳辐射作为热源对混凝土试件表面进行热激励,通过红外热像仪采集试件受热激励表面的温度数据,得到试件表面的温度分布情况以及表面温度随时间的变化情况,通过对此结果进行分析来定位裂缝的位置、判断裂缝的大小。(3)采用基于钢筋感应加热的红外热像法检测混凝土内部裂缝。选用高频感应加热仪对混凝土试件内部钢筋进行加热,通过红外热像仪采集与感应加热仪正对的试件表面的温度数据,得到试件表面的温度分布情况以及表面温度随时间的变化情况,通过对此结果进行分析来定位裂缝的位置、判断裂缝的大小。
[Abstract]:Concrete material has the advantages of high strength, low cost, convenient construction and local material selection. However, under the influence of hydration heat of cement, external load and natural disaster, etc. It is easy to produce cracks on the surface and inside of concrete. Especially for hydraulic concrete, the occurrence of cracks will affect the integrity and durability of the structure to some extent, and will also affect the bearing capacity of the structure when serious, and cause engineering accidents. It is of great significance to find an effective nondestructive testing method to detect the position and size of cracks in concrete, which can provide a reference for water conservancy engineering quality evaluation. Based on this, the infrared thermal image method is used to detect the internal cracks of concrete. The following research work is mainly carried out: (1) introducing the methods of nondestructive testing of concrete, the application and research status of infrared thermal imaging nondestructive testing technology. Based on the existing methods of nondestructive testing of concrete cracks, the infrared thermal image method is quoted. And applied to concrete crack detection, and then elaborated the infrared thermal imaging nondestructive testing related theory, The infrared thermal image method based on radiative heat source is used to detect the internal cracks of concrete. The far infrared quartz heating plate and solar radiation are used as heat sources to heat the surface of concrete specimen. The temperature data of the heated excited surface of the specimen were collected by infrared thermal imager, and the temperature distribution on the surface of the specimen and the change of the surface temperature with time were obtained. The location of the crack was located by analyzing the results. To determine the size of the crack, the infrared thermal image method based on induction heating of steel bar is used to detect the inner crack of concrete. The high frequency induction heating instrument is used to heat the steel bar inside the concrete specimen. The temperature distribution of the specimen surface and the change of the surface temperature with time are obtained by collecting the temperature data on the surface of the specimen which is directly aligned with the induction heating instrument by the infrared thermal imager. The location of the crack is located by analyzing the results. Judge the size of the crack.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN219;TV544

【参考文献】