Failure behavior of ultra high performance concrete (UHPC) beam under four-point bending identified by acoustic emission

Tayfur, Sena; Ege University; Turkey

Alver, N.; Ege University, Department of Civil Engineering; Turkey
Tanarslan, H.M.; Dokuz Eylul University; Turkey
Tayfur, S.; Ege University, Department of Civil Engineering; Turkey

ID: ECNDT-0433-2018
Session: Civil Infrastructure - AE
Room: J1
Date: 2018-06-12
Time: 14:30 - 14:50

Ultra High Performance Concrete (UHPC) is a cement-based composite material and has been widely used in the structural fields such as bridges and harbors. The studies indicate that UHPC having far higher mechanical superiorities than conventional concrete, has high strength and energy absorption under bending. Moreover, because presence of steel fibers increase the shear capacity, UHPC has become attractive to be used for productions of beams where high load carrying capacity is needed with smaller dimensions.
There are numerous techniques in order to monitor structural members subjected to loading. Acoustic Emission (AE) is one of these techniques and is a nondestructive testing method which is used for detection of damage under stress by detecting elastic waves.
In this study, in order to investigate the failure mechanism of UHPC beam under bending, AE monitoring was utilized. Thereafter, AE data obtained from the tests were processed by various AE analyses. Thus, failure behavior of UHPC beams was evaluated by comparing AE results with mechanical observations and effectiveness of AE method was revealed.
Keywords: Ultra High Performance Concrete (UHPC), Acoustic Emission, Failure Mechanism, Bending Behavior