Spatio-Temporal Distribution of the Sources of Acoustic Events in Notched Fiber-Reinforced Concrete Beams under Three-Point Bending

被引:6
|
作者
Triantis, Dimos [1 ]
Stavrakas, Ilias [1 ]
Loukidis, Andronikos [1 ]
Pasiou, Ermioni D. [2 ]
Kourkoulis, Stavros K. [2 ]
机构
[1] Univ West Attica, Dept Elect & Elect Engn, Elect Devices & Mat Lab, 250 Thivon Ave, Athens 12244, Greece
[2] Natl Tech Univ Athens, Sch Appl Math & Phys Sci, Dept Mech, Lab Testing & Mat, Zografou Campus, Athens 15773, Greece
关键词
acoustic emissions; acoustic sources; plain concrete; fiber-reinforced concrete; three-point bending; EMISSION; CLASSIFICATION; COMPRESSION; FAILURE;
D O I
10.3390/ma16145118
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The acoustic activity, generated in notched, beam-shaped concrete specimens, loaded under three-point bending, is studied in terms of the position of the sources of acoustic events, and the frequency of their generation. Both plain specimens (without any internal reinforcement) and specimens reinforced with various types of short fibers were tested. The target of the study is to investigate the existence of indices that could be considered as pre-failure indicators of the upcoming fracture. In addition, an attempt is undertaken to classify the damage mechanisms activated to tensile or shear nature. Considering comparatively the spatio-temporal evolution of the position of the acoustic sources and the respective temporal evolution of the frequency of generation of acoustic events, it was concluded that for relatively low load levels the acoustic sources are rather randomly distributed all over the volume of the specimens. As the load increases toward its maximum value, the acoustic sources tend to accumulate in the immediate vicinity of the crown of the notch and the average distance between them approaches a minimum value. When this minimum value is attained, the load is maximized and the generation frequency of the acoustic events increases rapidly. The simultaneous fulfillment of these three conditions is observed a few seconds before the onset of propagation of the catastrophic macrocrack for all classes of specimens tested, providing a kind of warning signal about the upcoming fracture. Moreover, the classification of the damage mechanisms to tensile and shear ones revealed a crucial difference between the plain and the reinforced specimens after the maximization of the load applied. Indeed, while for the plain specimens, the prevailing damage mechanism is tensile microcracking, for the reinforced specimens a balance between tensile and shear damage mechanisms is observed after the load applied has attained its peak and starts decreasing.
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页数:19
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