Fractal characteristics and damage evaluation of corroded beams under four-point bending tests based on acoustic emission techniques

• DOI: 10.1016/j.measurement.2022.111792
• Publication Date: 2022-08-27T19:02:15Z
• Authors: Yonglai Zheng; Yuan Wen; Tanbo Pan; Yongcheng Liu; Yujue Zhou; Ruizhi Li; Yubao Zhou
• Keywords: Acoustic Emission

Concrete Structures<br/>Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.<br/>This study investigated the relationship between the acoustic emission (AE) signals parameter sequence fractal characteristics and the damage evolution information of corroded reinforced concrete (RC) beams under four-point bending. Strength deterioration behavior and AE data can be obtained by coupling the four-point bending test and the AE monitoring. The results show that AE ringing counts of corroded and uncorroded beams had prominent fractal characteristics. The fractal dimension values of corroded RC beams all showed a fluctuating rise to a peak and then a sharp drop before the failure. The damage index corresponding to the peak point decreases with the increase of corrosion degree. Fractal dimension peak point could be used as an early warning point for corroded RC beams' failure. Moreover, the AE fractal dimension analysis can effectively reflect the pattern of crack development, which have an important value for evaluating the process of corroded RC beams rupture.<br/>