Applications of Acoustic Emission Technique Associated with the Fracture Process Zone in Concrete Beam – A Review

Abstract

This paper summarized the recent development within the application of acoustic emission technique in the formation of fracture process zone and the AE energy released during the fracture process in concrete beam specimens. AE technique is a non destructive technique which is a useful tool to study the energy released during the different failure mechanisms in different types of materials and fracture process is one of the failure mechanisms in concrete. Most of the researchers were applied three point bending test on plain concrete in order to determine the facture process zone of the concrete and some of them were used numerical modeling to verify their results. The results between AE data and experimental in different parameters such as specimens size and aggregate size are normally compared. As a conclusion, AE technique is a very useful tool to determine the fracture process zone in concrete.

Relationship Between Ae Signal Strength and Absolute Energy in Determining Damage Classification of Concrete Structures

“…The AE sensor type of R6I (40-100kHz) was mounted at the location using viscous coupling agent. The sensitivity of the AE sensor installation was verified using the Hsu-Nielsen source method and the threshold setting is 45dB to prevent the system detecting any noise from the surrounding area [19][20][21][22][23].…”

“…According to the felicity ratio value, the Kaiser effect is strongly present when the value is equal or greater than 1.0 while the structure is stable and it becomes unstable when the value is less than 1.0 [12,[21][22][23]. The value of Felicity Ratio is changeable depending on the structure condition, but most studies used 0.5 as the level for damage identification in RC columns [14,18,24].…”

“…The combination of two ratios parameter (absolute energy and signal strength) provides more information to access the condition on RC structure. These evaluation criteria were developed by Japanese Society of Nondestructive Inspection (JSNDI) [16,[23][24][25][26][27].…”