MFRWA: A Multi-Frequency Rayleigh Wave Approximation Method for Concrete Carbonation Depth Evaluation

Author:

Sun Xiangtao1ORCID,Cui Yongxiang1ORCID,Chen Jiawei2,Yi Shanchang3,Li Xiuquan1,Chen Lin1

Affiliation:

1. Department of Disaster Mitigation for Structures, Tongji University, Shanghai 200092, China

2. College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China

3. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China

Abstract

Carbonation depth is essential to determine the durability and predict the remaining service life of concrete structures. This study proposes a multi-frequency Rayleigh wave approximation method (MFRWA) to evaluate carbonation depth by exploiting the frequency-dependent penetration depths of ultrasonic Rayleigh waves. A series of numerical simulations are conducted to investigate the effective penetration depth of Rayleigh waves and the feasibility of the proposed MFRWA method on carbonation depth evaluation. Subsequently, the accelerated carbonation experiment is conducted to evaluate the carbonation depth using low-frequency and high-frequency Rayleigh waves, and the measured results from the Rayleigh wave method are compared with the ones from the phenolphthalein indicator and thermalgravimetric analysis (TGA) method. The results show that carbonation depth measured by Rayleigh wave method meets well with the one from TGA technique, demonstrating that the proposed method could provide a non-destructive and precise carbonation depth estimation. The proposed MFRWA method contributes a novel scheme for concrete carbonation evaluation and holds substantial potential in both laboratory and field applications.

Funder

National Natural Science Foundation of China

Publisher

MDPI AG

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