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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Detection of Defects in Reinforced Concrete Structures Using Ultrasonic Nondestructive Evaluation with Piezoceramic Transducers and the Time Reversal Method
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Detection of Defects in Reinforced Concrete Structures Using Ultrasonic Nondestructive Evaluation with Piezoceramic Transducers and the Time Reversal Method

机译：压电陶瓷换能器的超声无损评估和时间反转法检测钢筋混凝土结构中的缺陷

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Reinforced concrete is of vital importance in many civil and industrial structural applications. The effective bonding between steel and concrete is the core guarantee of the safe operation of the structures. Corrosion or other interface debonding in steel-concrete is a typical failure mode during the long service period of the structures, which can severely reduce the load-bearing capacity. The Non-destructive Evaluation technique has been applied to civil engineering structures in recent years. This paper investigates the evaluation of reinforced concrete structures that have interface defects, including the cross-sectional loss and cracks, by using the piezoceramic induced ultrasonic wave and time reversal method. Ultrasonic wave is used as actuating wave to obtain the signals with defect information. Time reversal method is applied to localize and characterize defect along the interface of the steel-concrete and to image the defect through the cross-sectional scanning. Experiments were conducted to perform Nondestructive Evaluation by using six reinforced concrete components with different levels of defects. The invisible damages were made by the cutting part of the steel and embedding a table tennis ball inside concrete structures. The results show that the time reversed method can locate and evaluate the defects along the steel reinforced concrete, and the obtained defect images at the cross-section of the concrete structure are accurate.
机译：在许多民用和工业结构应用中，钢筋混凝土至关重要。钢与混凝土之间的有效粘结是结构安全运行的核心保证。钢筋混凝土中的腐蚀或其他界面剥离是结构长期使用期间的典型失效模式，这会严重降低承重能力。近年来，无损评估技术已应用于土木工程结构。本文利用压电陶瓷感应超声波和时间倒转方法研究了具有界面缺陷（包括截面损失和裂缝）的钢筋混凝土结构的评估。超声波用作激励波，以获取具有缺陷信息的信号。时间逆转方法用于沿着钢-混凝土界面定位和表征缺陷，并通过横截面扫描对缺陷成像。通过使用六个具有不同缺陷水平的钢筋混凝土组件进行了实验，以进行无损评估。看不见的损坏是由于切割了一部分钢材并将乒乓球嵌入混凝土结构中而造成的。结果表明，采用时间反演方法可以定位和评估钢筋混凝土中的缺陷，并且所获得的混凝土结构截面上的缺陷图像是准确的。

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