Open Access

ARTICLE

Research on Sleeve Grouting Density Detection Based on the Impact Echo Method

by Pu Zhang¹, Yingjun Li¹, Xinyu Zhu¹, Shizhan Xu¹, Pinwu Guan^1,*, Wei Liu², Yanwei Guo², Haibo Wang²

1 School of Civil Engineering, Zhengzhou University, Zhengzhou, 450000, China
2 Xixi Expressway Construction Co., Ltd., Nanyang, 474450, China

* Corresponding Author: Pinwu Guan. Email:

Structural Durability & Health Monitoring 2024, 18(2), 143-159. https://doi.org/10.32604/sdhm.2024.046986

Received 21 October 2023; Accepted 25 December 2023; Issue published 22 March 2024

Abstract

Grouting defects are an inherent challenge in construction practices, exerting a considerable impact on the operational structural integrity of connections. This investigation employed the impact-echo technique for the detection of grouting anomalies within connections, enhancing its precision through the integration of wavelet packet energy principles for damage identification purposes. A series of grouting completeness assessments were meticulously conducted, taking into account variables such as the divergent material properties of the sleeves and the configuration of adjacent reinforcement. The findings revealed that: (i) the energy distribution for the high-strength concrete cohort predominantly occupied the frequency bands 42, 44, 45, and 47, whereas for other groups, it was concentrated within the 37 to 40 frequency band; (ii) the delineation of empty sleeves was effectively discernible by examining the wavelet packet energy ratios across the spectrum of frequencies, albeit distinguishing between sleeves with 50% and full grouting density proved challenging; and (iii) the wavelet packet energy analysis yielded variable detection outcomes contingent on the material attributes of the sleeves, demonstrating heightened sensitivity when applied to ultrahigh-performance concrete matrices and GFRP-reinforced steel bars.

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Keywords

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