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

作　　者：Pu Zhang Yingjun Li Xinyu Zhu Shizhan Xu Pinwu Guan Wei Liu Yanwei Guo Haibo Wang 

机构地区：[1]School of Civil Engineering,Zhengzhou University,Zhengzhou,450000,China [2]Xixi Expressway Construction Co.,Ltd.,Nanyang,474450,China

出　　处：《Structural Durability & Health Monitoring》2024年第2期143-159,共17页结构耐久性与健康监测（英文）

基　　金：supported by financial support from the National Natural Science Foundation of China(U1904177);the Excellent Youth Natural Science Foundation of Henan Province of China(212300410079);the Subproject of the Key Project of the National Development and Reform Commission of China(202203001);the Project of Young Key Teachers in Henan Province of China(2019GGJS01);Horizontal Research Projects(20230352A).

摘　　要：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 highstrength 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.

关 键 词：Prefabricated building steel grouting sleeve impact echo method wavelet packet energy grouted defect 

分 类 号：TV543[水利工程—水利水电工程]