APPLICATION OF ACOUSTIC EMISSION TESTING IN ORDER TO UNDERSTAND MODE I FRACTURE PROCESS IN STEEL FIBRE REINFORCED CONCRETE
Vidya Sagar RemalliGrand Ballroom C
This article presents characteristics of acoustic emissions (AE) generated during the mode I fracture process in steel fibre reinforced concrete (SFRC). Three-point bend SFRC specimens were tested in the laboratory by following EN-14651-2005 guidelines. A 2D planar location was adopted to mount the four 57 kHz resonant-type AE sensors on the test specimen to record the generated AE. The number of AE events reduced with the increase in the steel fiber content under the same experimental conditions. The fracture process zone (FPZ) was divided into major damage zone comprised of AE events with (i) high peak amplitude, (ii) low information entropy (iii) longer AE waveform duration. The major damage zone was located ahead of the notch tip very closely. AE testing is a useful testing method to study the fracture process in SFRC.