Cracking Behavior of Steel Fiber Reinforced Concrete Revealed by Means of Acoustic Emission and Ultrasonic Wave Propagation

10.14359/625 ◽  
1999 ◽  
Vol 96 (3) ◽  
Keyword(s):  
Acoustic Emission ◽  
Wave Propagation ◽  
Reinforced Concrete ◽  
Ultrasonic Wave ◽  
Steel Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Cracking Behavior ◽  
Ultrasonic Wave Propagation

Acoustic emission by steel fiber reinforced concrete under tensile damage

2017 ◽  
Vol 59 (7-8) ◽  
pp. 653-660 ◽  
Author(s):  
Wang Yan ◽  
Ge Lu ◽  
Chen Shi Jie ◽  
Zhou Li ◽  
Zhang Ting Ting
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Steel Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Tensile Damage

scholarly journals Acoustic Emission for Evaluating the Reinforcement Effectiveness in Steel Fiber Reinforced Concrete

2021 ◽  
Vol 11 (9) ◽  
pp. 3850
Author(s):  
Anastasios C. Mpalaskas ◽  
Theodore E. Matikas ◽  
Dimitrios G. Aggelis ◽  
Ninel Alver
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Steel Fiber ◽  
Mechanical Tests ◽  
Fiber Reinforced Concrete ◽  
Fracture Mechanisms ◽  
Shear Stresses ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Unreinforced Material

Steel fiber reinforcement in concrete strongly enhances its ductility and toughness. This is basically due to the additional fracture mechanisms and energy used to overcome the interlocking and adhesion between the fibers and the cementitious matrix. The enhancement of the final properties is measured by mechanical tests and can be assessed only at the end of loading. These processes can be targeted and monitored by acoustic emission (AE) indices offering real-time characterization of the material’s performance much earlier than the final failure or the termination of loading. In this study, steel fiber reinforced concrete (SFRC) beams were tested in bending with simultaneous AE monitoring. Tests conducted independently in different laboratories confirm that the AE behavior at low load levels is very indicative of the amount of reinforcement and consequently, of the final mechanical properties. The reason is that the reinforcement phase is activated through shear stresses in its interphase, a mechanism that is more profound in the presence of higher fiber content, and correspondingly is absent in plain unreinforced material. This finding opens the way to characterize the effectiveness of reinforcement with just a proof loading at less than 30% of the final load bearing capacity.

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