Abstract
The present study deals with the acoustic emission (AE) monitoring of fracture behavior of repaired marble specimens. Different types of specimens were ultrasonically interrogated. Subsequently, the damage was induced to these specimens by three-point bending. The damaged specimens were repaired using a suitable epoxy agent; then, they were mechanically loaded again. Apart from the well-known correlation of pulse velocity to strength for building materials, which also holds for the materials used in this study, AE provides a unique insight into the fracture behavior of the specimens. A statistical analysis of the experimental data has been performed to investigate the correlation between AE parameters and the strength of the specimens. This work discusses the passive monitoring of fracture in repaired marble specimens and shows that AE parameters, well-known to successfully characterize cementitious materials, also provide satisfactory results in characterizing monolithic materials such as marble. It is concluded that AE monitoring during a proof loading can provide good insight information of the materials and characterize their restoration.
Highlights
Acoustic emission has been used for the monitoring of cement-based materials like concrete and mortars, and metals, rocks, marbles, and granites covering all the commonly used materials that are included in structural elements at the constructions The basic principle of the AE is the record of the elastic pulses after crack initiation and propagation incidents with the usage of piezoelectric sensorsIn the present study we wish to study the effect during the early stages of loading in three-point bending of repaired marble specimensThe damaged specimens were repaired using a suitable epoxy agent they were mechanically loaded againThe average frequency and RA value showed a satisfactory characterization of the capacity of the material even during early loading
The RA values of repaired specimens during the different stages of loading characterize the bonding failure between the fracture surface and the epoxy resin used for the repair of the specimens
For the acoustic emission energy emitted, the most significant role is on the interface bonding between the epoxy and the marble at the fracture surface because the level of restoration seems to correlate with the cumulative Energy
Summary
Acoustic emission has been used for the monitoring of cement-based materials like concrete and mortars, and metals, rocks, marbles, and granites covering all the commonly used materials that are included in structural elements at the constructions The basic principle of the AE is the record of the elastic pulses after crack initiation and propagation incidents with the usage of piezoelectric sensors. The average frequency and RA value showed a satisfactory characterization of the capacity of the material even during early loading. It was an initial effort to correlate low load AE (approximately one-third of the ultimate load) to the final maximum load of marble strength both in the intact and the repaired state. The RA values of repaired specimens during the different stages of loading characterize the bonding failure between the fracture surface and the epoxy resin used for the repair of the specimens
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