| Title |
Homogeneity Evaluation of Fiber-Reinforced Concrete Using Diffuse Ultrasound |
| Authors |
강승군(Kang, Seunggun) ; 김주석(Kim, Joo-seok) ; 최열(Choi, Yeol) ; 강상구(Kang, Sanggoo) |
| DOI |
https://doi.org/10.5659/JAIK.2025.41.9.343 |
| Keywords |
Fiber-Reinforced Concrete; Non-Destructive Testing; Diffuse Ultrasound; Homogeneity |
| Abstract |
This study aims to evaluate the homogeneity of concrete using the diffuse ultrasound theory. Ultrasound propagating within concrete undergoes diffusion and dissipation due to changes in the microstructure, which can be approximated as scattered wavelengths using the diffuse ultrasound theory. Therefore, analyzing the diffusion and dissipation processes of ultrasound enables the detection of changes in internal homogeneity. In this study, fiber inclusion was introduced as a factor influencing changes in the concrete microstructure. To evaluate the versatility of the homogeneity analysis method, experiments were conducted using commonly used reinforcement fibers: CARBON, JUTE, GLASS, and STEEL. Additionally, fiber content was categorized into 0.5% and 1% to analyze its effect on homogeneity changes. The experimental results showed that the diffusion coefficient was highest in the concrete specimen without fiber reinforcement (NC), and in most fiber-reinforced specimens, an increase in fiber content led to a decrease in the diffusion coefficient. This phenomenon is attributed to the increased ultrasonic scattering caused by decreased internal homogeneity, resulting in delayed diffusion. In the case of dissipation, most fiber-reinforced specimens exhibited lower dissipation coefficients than the NC specimen, except for specific mixtures. However, no clear correlation was observed between fiber content and changes in the dissipation coefficient. This result suggests that dissipation is significantly influenced by the size and shape of internal inhomogeneities. |