This article presents a study on the ‘time evolution of acoustic emissions (AE)’ in terms of time-to-failure to understand the compressive fracture process in Steel Fiber Reinforced Concrete (SFRC). In other words, the study focuses on how generation of AE…
This article presents a study on the ‘time evolution of acoustic emissions (AE)’ in terms of time-to-failure to understand the compressive fracture process in Steel Fiber Reinforced Concrete (SFRC). In other words, the study focuses on how generation of AE changes with time. Several unconfined uniaxial compression tests were conducted in the laboratory on specimens with varying fiber content (Vf), and simultaneously, the generated AE were recorded. The present study considered time function (F) which is based on inter-hit time intervals to distinguish between different fracture stages involved in the compressive fracture process. The pre-peak behavior and post-peak behavior is analyzed separately on the logarithmic scale, providing a magnified view of fracture process at all the loadingstages. TheevolutionofF overtimereflectsarecurringsetofqualitativefeaturesforeachVf. The F involves the optimized selection of a sliding time window as it describes the resolution of the analysis. Thus, the variation of the sliding time window for F was also studied. The F was observed to be governed by a power law, with the exponent varying in proportion to Vf. The scaling described by power law is in accordance with the accelerated deformation law observed in seismology, which substantiates the universality law. The interpretation of the AE data provides useful information on pre-failure indication and contributes to an understanding of the mechanical behavior of SFRC.