Characterisation of corrosion-induced crack in concrete using ultrasonic diffuse coda wave

被引：17
作者：
Cheng W. [1 ]
Fan Z. [1 ]
Tan K.H. [2 ]
机构：
[1] School of Mechanical and Aerospace Engineering, Nanyang Technological University
[2] School of Civil and Environmental Engineering, Nanyang Technological University
来源：
Ultrasonics | 2023年 / 128卷
基金：
新加坡国家研究基金会;
关键词：
Crack characterisation; Diffuse coda wave; Non-destructive inspection; Reinforcing bar corrosion; Scattering cross-section;
D O I：
10.1016/j.ultras.2022.106883
中图分类号：
学科分类号：
摘要：
Corrosion damage in reinforcing steel bars has been a major cause of cracking and spalling of reinforced concrete. To extend the service life of concrete structures, non-destructive testing methods are necessary to assess the corrosion status in order to conduct a timely repair. At the early stage of corrosion, rust grows from the reinforcing bar, subsequently generates cracks towards the surface of the concrete. Ultrasonic methods have been widely used to detect cracks in concrete. However, it is challenging to characterise them due to the heterogeneous material properties of the concrete. In this paper, ultrasonic imaging technique based on diffuse coda wave has been explored to inspect and characterise corrosion-induced cracks. In this method, scattering cross-section of the crack is reconstructed with the Locadiff imaging technique. Based on the assumption that both crack tips have the same scattering cross-section, the size of the crack can be estimated when the location of the reinforcing bar is known. Numerical simulations were carried out to image straight and curved cracks, showing excellent accuracy. Experiments were designed subsequently on concrete samples with accelerated corrosion. The induced cracks were characterised by the proposed ultrasonic method, and compared with X-ray CT results, showing very good agreement. © 2022 Elsevier B.V.
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