Exploiting Slow Dynamics Effects for Damage Detection in Concrete

Bentahar, Mourad; Bella, Angelo Di; Mechri, Charfeddine; Montrésor, Silvio; Scalerandi, Marco; Yu, Xiaomei

doi:10.3389/fbuil.2020.00064

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…It has been found that earthquakes induce a drop in subsurface seismic velocity, which is followed by a recovery on time scales ranging from a few days to several years [5][6][7] . The recovery dynamics resemble universal relaxation 8 , a phenomenon observed in rocks 9 , granular media 10 , concrete 11 and civil structures 12 . In the field, seismic velocity changes can be obtained through correlations of ambient seismic noise, a technique called seismic interferometry.…”

Section: Introductionmentioning

confidence: 81%

Predictable recovery rates in near-surface materials after earthquake damage

Illien,

Turowski,

Sens-Schönfelder

et al. 2024

Preprint

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Earthquakes introduce transient mechanical damage in the subsurface, which causes postseismic hazards and can take years to recover. This observation has been linked to relaxation, a phenomenon observed in a wide class of materials after straining perturbations, but its duration after earthquake ground shaking has not been constrained. Here, we analyse the effects of two successive large earthquakes and their aftershocks on ground properties using estimates of seismic velocity from ambient noise interferometry. We show that the relaxation time scale is a function of the state of the substrate at the time of seismic perturbation, rather than the intensity of ground shaking. Our study highlights the predictability of earthquake damage dynamics in the shallow subsurface and also in other materials. This finding may be reconciled with existing state variable frameworks by considering the superposition of different populations of damaged contacts.

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Section: Introductionmentioning

confidence: 81%

Predictable recovery rates in near-surface materials after earthquake damage

Illien,

Turowski,

Sens-Schönfelder

et al. 2024

Preprint

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“…To evaluate the effects of this atmospheric corrosion on the dynamic vibration (resonance) behavior of the bronze, the resonance frequencies of the corroded specimens and their damping (or quality factor) were evaluated under linear and nonlinear vibration conditions. Nonlinear techniques are known for their sensitivity to the mesoscopic structural evolutions of different materials (composites, metals, concrete…) [ 14 , 15 , 16 , 17 ]. Through excited standing waves, the evolution of real and imaginary components of the elastic modulus can be evaluated through the excited resonances.…”

Section: Introductionmentioning

confidence: 99%

“….) [14][15][16][17]. Through excited standing waves, the evolution of real and imaginary components of the elastic modulus can be evaluated through the excited resonances.…”

Section: Introductionmentioning

confidence: 99%

Does Atmospheric Corrosion Alter the Sound Quality of the Bronze Used for Manufacturing Bells?

Bentahar,

Petitmangin,

Blanc

et al. 2023

Materials

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Bells are made of bronze, an alloy of copper and tin. Art objects and musical instruments belong to tangible and intangible heritage. The effect of atmospheric alteration on their sound is not well documented. To address this question, alteration cycles of bronze specimens are performed in a chamber reproducing a realistic polluted coastal atmosphere. The corrosion layers are characterized by X-ray diffraction, electron microscopy and X-ray photoelectron spectrometry. The buried interface of the film (alloy-layer interface) is formed by a thin, adherent and micro-cracked layer, mainly composed of sulfates, copper oxide and chloride, on top of tin corrosion products. Near the atmosphere-film interface, less adherent irregular clusters of soot, calcite, gypsum and halite developed. Through these observations, an alteration scenario is proposed. To correlate the bronze corrosion effect on the bell sound, linear and nonlinear resonance experiments are performed on the corroded bronze specimens, where resonance parameters are monitored as a function of increasing driving force using a shaker. Results show that the corrosion effect on the acoustic properties can be monitored through the evolution of the acoustic nonlinear parameters (damping and resonance). These well-calibrated original experiments confirm the effect of corrosion on the acoustic properties of bronze.

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“…AE event rate was also used to study salt crystallization in limestones [ 13 ]. Some research revealed that AE signals can also be used to understand the nonlinear relaxation (slow dynamics) of concrete taken at the initial and micro-cracked states [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission Monitoring of Progressive Damage of Reinforced Concrete T-Beams under Four-Point Bending

et al. 2022

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Acoustic Emission (AE) is revealed to be highly adapted to monitor materials and structures in materials research and for site monitoring. AE-features can be either analyzed by means of physical considerations (geophysics/seismology) or through their time/frequency waveform characteristics. However, the multitude of definitions related to the different parameters as well as the processing methods makes it necessary to develop a comparative analysis in the case of a heterogeneous material such as civil engineering concrete. This paper aimed to study the micro-cracking behavior of steel fiber-reinforced reinforced concrete T-beams subjected to mechanical tests. For this purpose, four-points bending tests, carried out at different displacement velocities, were performed in the presence of an acoustic emission sensors network. Besides, a comparison between the sensitivity to damage of three definitions corresponding to the b-value parameter was performed and completed by the evolution of the RA-value and average frequency (AF) as a function of loading time. This work also discussed the use of the support-vector machine (SVM) approach to define different damage zones in the load-displacement curve. This work shows the limits of this approach and proposes the use of an unsupervised learning approach to cluster AE data according to physical and time/frequency parameters. The paper ends with a conclusion on the advantages and limitations of the different methods and parameters used in connection with the micro/macro tensile and shear mechanisms involved in concrete cracking for the purpose of in situ monitoring of concrete structures.

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Exploiting Slow Dynamics Effects for Damage Detection in Concrete

Cited by 5 publications

References 36 publications

Predictable recovery rates in near-surface materials after earthquake damage

Predictable recovery rates in near-surface materials after earthquake damage

Does Atmospheric Corrosion Alter the Sound Quality of the Bronze Used for Manufacturing Bells?

Acoustic Emission Monitoring of Progressive Damage of Reinforced Concrete T-Beams under Four-Point Bending

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