Fracture process and reliability of concrete made from high grade recycled aggregate using acoustic emission technique under compression

Kencanawati, Ni Nyoman; Iizasa, S.; Shigeishi, Mitsuhiro

doi:10.1617/s11527-012-9986-z

Cited by 30 publications

(11 citation statements)

References 3 publications

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“…Meanwhile, this observation shows that the crushing zones mainly appear in the middle of the specimen, meaning that stress concentration area forms in the middle of the specimen. According to many researchers [53][54][55][56][57], the relationship between RA value (RA = rise time/ amplitude) and average frequency (AF) (AF = counts/duration time) can be used to classify the tensile and shear crack. The tensile crack is considered to be an AE signal with higher AF and lower RA.…”

Section: Failure Morphologymentioning

confidence: 99%

Damage Evolution and Failure Behavior of Post-Mainshock Damaged Rocks under Aftershock Effects

et al. 2019

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Rock stability has long been a hot topic during underground energy exploitation, but the failure process of rock materials under earthquake effects is extremely complicated, and the failure mechanism still remains unclear. In order to investigate the fatigue damage and failure behavior of rocks under aftershock effects considering the post-mainshock damage states, a series of laboratory tests were conducted on marble specimens subjected to stepwise cyclic loading. Four levels of peak stress (i.e., 10, 30, 50, and 70 MPa) were applied in the first cycle, to simulate mainshock damage.The results indicate that, with the increase of initial cycle amplitude, mainshock damage has a significant effect on deformation behavior, dissipated energy, P-wave velocity, and AE characteristics of tested specimens during aftershock process. The increasing amplitude of initial cycle enhances irreversible deformation and weakens the resistance to deformation, which accelerates the expansion of specimen volume and results in the reduction of bearing capacity. Furthermore, the increasing amplitude of initial cycle obviously changes the failure morphologies and intensifies the final macro-fracture scale of tested specimens, which are verified by acoustic emission AF-RA value and b-value, respectively.

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Section: Failure Morphologymentioning

confidence: 99%

Damage Evolution and Failure Behavior of Post-Mainshock Damaged Rocks under Aftershock Effects

et al. 2019

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“…Acoustic Emission (AE) monitoring is a pertinent technique for monitoring fracture processes in concrete, both on material and structural levels, e.g. [3,[15][16][17][18][19][20][21]. The method is based on the small elastic stress waves produced by sudden movements in stressed materials caused by crack initiation and growth.…”

Section: Acoustic Emissionmentioning

confidence: 99%

Meso Mechanical Study of Cracking Process in Concrete Subjected to Tensile Loading

Flansbjer

Lindqvist

2018

Nordic Concrete Research

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This project focused on how the cracking process in concrete is influenced by both the micro and meso structures of concrete. The aim was to increase knowledge pertaining to the effect of critical parameters on the cracking process and how this is related to the material’s macroscopic properties. A methodology based on the combination of different experimental methods and measuring techniques at different scales was developed. Crack propagation during tensile loading of small-scale specimens in a tensile stage was monitored by means of Digital Image Correlation (DIC) and Acoustic Emission (AE). After testing, crack patterns were studied using fluorescence microscopy.

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“…However, in practical application, such as the increase of wall cracks has become the bottleneck of the development of this new construction material. In this regard, scanning electron microscopy (SEM) observation [24]- [26], acoustic signal feedback information processing [25], [27], [28] and other technologies have been used to analyze the internal primary structure of recycled concrete, as well as its micro-damage and damage mechanism [29]. It is of great practical engineering significance to use acoustic emission technology to study the safety performance evaluation and non-destructive detection technology of concrete structures [30].…”

Section: Introductionmentioning

confidence: 99%

Research and Application of Acoustic Emission Signal Processing Technology

2019

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Acoustic emission signal processing has always been a key problem in damage assessment of components and materials, and parameter analysis and waveform analysis are two important means of acoustic emission signal processing. In this paper, the parameter analysis method in signal processing and the meaning and characteristics of each parameter are introduced. Then, the waveform analysis method is introduced and the basic theory of wavelet transform and its spectrum analysis in waveform analysis method are mainly analyzed. The comparison between wavelet transform and Fourier transform is made: traditional Fourier transform signal processing methods can only be used to process transient stationary signals, and the transient non-stationary signals cannot be analyzed locally. The wavelet transform can take into account the characteristics of both the time and frequency domains, and it can also reflect the local signal well. Through the analysis of the signals in the process of concrete damage, it is found that the two signal processing methods mentioned above can well characterize the damage evolution of materials and damage precursors.

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Fracture process and reliability of concrete made from high grade recycled aggregate using acoustic emission technique under compression

Cited by 30 publications

References 3 publications

Damage Evolution and Failure Behavior of Post-Mainshock Damaged Rocks under Aftershock Effects

Damage Evolution and Failure Behavior of Post-Mainshock Damaged Rocks under Aftershock Effects

Meso Mechanical Study of Cracking Process in Concrete Subjected to Tensile Loading

Research and Application of Acoustic Emission Signal Processing Technology

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