On the evaluation of interface quality in concrete repair system by means of impact-echo signal analysis

Abstract

h i g h l i g h t sConcrete substrate roughness and microcracking influence stress wave propagation. No relation between bond strength and amplitudes of frequency peaks in IE spectrum. Proposed FE model is useful for simulation of stress wave propagation in repair systems with different interface quality. Bond strength estimation with IE needs advanced signal analysis e.g. wavelet analysis. a r t i c l e i n f o b s t r a c tAccording to Concrete Repair Manual as well as ACI 562-16 and European EN 1504-10 standards, a bond strength as a measure of adhesion is one the main feature of repair system necessary to be assessed. The most common laboratory and engineering method for bond strength evaluation is pull-off test. This is however a semi-destructive method that needs a repair in a place of measurement. Recently, the great interest in nondestructive techniques (NDT) development is noted. Impact-echo (IE) is considered as one of the most promising methods for this purpose.In this paper, the study on the usability the IE test based on frequency spectrum analysis for bond strength evaluation is analyzed. Both Finite Element Method (FEM) simulation and experimental tests were performed in order to obtain potential relations between IE frequency spectrum and parameters characterizing concrete substrate quality that may affect the final bond strength and the real value of pull-off bond strength measured on samples as well. It was concluded that the IE method can be a useful tool for interface quality and bond strength evaluations in concrete repair system. However, more complex signal analysis, e.g. wavelet analysis, should be considered in the future.

Analysis method of impact echo based on variational mode decomposition

“…But IE can be used in single-faceted detection. This method has obvious advantages compared with other traditional methods [8].…”

Failure Monitoring and Condition Assessment of Steel-Concrete Adhesive Connection Using Ultrasonic Waves

“…One of the most efficient techniques to characterize a contact between connected components is a method utilizing the phenomenon of elastic wave propagation. Ultrasonic waves have been successfully used in the evaluation of bolted connections between metal elements [18][19][20], adhesive connections between metal elements [21][22][23] or adhesive connection between concrete substrate and repair materials [24][25][26]. Recently, studies of damage evaluation based on the concept of ultrasound monitoring have been reported The examples of their application include monitoring of damage in concrete samples [27], reinforced concrete beams [28][29][30] or in an adhesive lap joint of metal elements [31].…”

Multi-Scale Evaluation of the Interphase Zone between the Overlay and Concrete Substrate: Methods and Descriptors

“…Although the sand patch test [14,25] and the profilometric method [44,65] are still popular for evaluating the surface morphology of concrete, Tayeh et al [30], Siewczyńska [66], Hoła et al [67] and Sadowski et al [68] successfully used the 3D laser scanning method to evaluate the interphase zone between the overlay and concrete substrate. At the meso level, NDT involved the analysis of acoustic descriptors obtained with the use of the impact-echo method [69,70], the ultrasonic echo method [71,72], the ultrasonic pulse velocity method [73] and the acoustic emission method [74]. In literature, the infrared thermography method has been also used for the evaluation of the bond between overlay and concrete substrate [75].…”