Abstract
Concrete, when exposed to high temperatures, presents important changes in its properties of strength and deformation and, in extreme situations, these alterations can constitute risks to the integrity and the safety of the structures. This work presents extensive campaign with 70 cylindrical specimens and seven different mixture proportions: two of mortar and five of concrete, to analyze the propagation profile of longitudinal and transverse ultrasonic waves in concrete cylindrical specimens, associating the variation of the ultrasonic pulses with the level of compression stresses and the degree of damage imposed by high temperature. The compressive strength was within the range of 32 and 64 MPa and the specimens were exposed to temperatures of 250°, 300° and 350°C. The results indicate that longitudinal and transverse ultrasonic waves can be successfully applied in the evaluation of diffuse damage cause by uniaxial compression load and exposure to high temperatures.
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ACKNOWLEDGMENTS
Authors thank Capes and CNPq for their financial support, essential for the conclusion of this major step forward. Also thanks to Senai and Letmacc (Civil Construction Materials Technological Test Laboratory), especially to coordinator Ana Paula Alencar for her friendship, efficiency and offering the laboratory to perform the technological tests. Also to laboratory technicians David Macedo, Felipe Clayton and Nelson Martins for their vital, help in carrying out the tests.
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Silva, F.A., Nogueira, C.L., Silva, J.A. et al. Ultrasonic Assessment of Damage in Concrete under Compressive and Thermal Loading Using Longitudinal and Transverse Waves. Russ J Nondestruct Test 55, 808–816 (2019). https://doi.org/10.1134/S1061830919110081
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DOI: https://doi.org/10.1134/S1061830919110081