Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Relating ultrasonic signals to concrete microstructure using X-ray computed tomography
Highlights Concrete examined nondestructively with both x-ray computed tomography and ultrasound. CT-based parameters based on grayscale and gradients can quantify structure of concrete. Diffuse ultrasound linked to CT-based measures of absorption and scattering potential. Diffusivity had strong correlation with paste capillary porosity.
Abstract With a goal to improve our understanding of the relationships between microstructural features and ultrasonic signal behavior, concrete specimens of varying water-to-cement ratio were imaged using X-ray computed tomography (CT), and subsequently subjected to ultrasonic testing. From the CT scans, measurements were made of cement paste density and number of interfaces. Ultrasonic signals produced using a through-transmission configuration were analyzed and fit to a diffusion model to separate absorption from scattering attenuation. The results showed that at the frequencies tested, ultrasonic dissipation rate correlated weakly with paste density, while diffusivity correlated well with number of interfaces, but only if entrained air is considered separately. Cement paste density was found to be very well predicted by diffusivity, leading to a clear power-law relationship between diffusivity and compressive strength.
Relating ultrasonic signals to concrete microstructure using X-ray computed tomography
Highlights Concrete examined nondestructively with both x-ray computed tomography and ultrasound. CT-based parameters based on grayscale and gradients can quantify structure of concrete. Diffuse ultrasound linked to CT-based measures of absorption and scattering potential. Diffusivity had strong correlation with paste capillary porosity.
Abstract With a goal to improve our understanding of the relationships between microstructural features and ultrasonic signal behavior, concrete specimens of varying water-to-cement ratio were imaged using X-ray computed tomography (CT), and subsequently subjected to ultrasonic testing. From the CT scans, measurements were made of cement paste density and number of interfaces. Ultrasonic signals produced using a through-transmission configuration were analyzed and fit to a diffusion model to separate absorption from scattering attenuation. The results showed that at the frequencies tested, ultrasonic dissipation rate correlated weakly with paste density, while diffusivity correlated well with number of interfaces, but only if entrained air is considered separately. Cement paste density was found to be very well predicted by diffusivity, leading to a clear power-law relationship between diffusivity and compressive strength.
Relating ultrasonic signals to concrete microstructure using X-ray computed tomography
Landis, Eric N. (Autor:in) / Hassefras, Emiel (Autor:in) / Oesch, Tyler S. (Autor:in) / Niederleithinger, Ernst (Autor:in)
26.09.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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