We describe the feasibility of a nondestructive evaluation (NDE) method for concrete based on the propagation of highly nonlinear solitary waves (HNSWs) along a one-dimensional chain of spherical particles placed in contact with the concrete to be tested. The chain is part of a built-in transducer designed and assembled to excite and detect HNSWs. The method exploits the dynamic interaction between the particles and the concrete. The hypothesis is that the interaction depends on the stiffness of the concrete and influences the time of flight and amplitude of the solitary pulses reflected at the transducer/concrete interface, and traveling within the chain. The results show that the time of flight is monotonically dependent upon the modulus of elasticity of the concrete and that the transducers designed and assembled in this study are reliable and repeatable. In the future, the proposed NDE method may potentially serve as a cost-effective tool for the rapid evaluation of existing concrete structures.
Amir Nasrollahi, Wen Deng, and Piervincenzo Rizzo, "Highly nonlinear solitary waves to estimate the modulus of concrete with different water-to-cement ratios," Proc. SPIE 10169, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017, 101691C (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 28, 2017; Published: 19 April 2017); https://doi.org/10.1117/12.2258556.
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