TY - JOUR A1 - Landis, E. A1 - Hassfras, Emiel A1 - Oesch, Tyler A1 - Niederleithinger, Ernst T1 - Relating ultrasonic signals to concrete microstructure using X-ray computed tomography T2 - Construction and Building Materials N2 - 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. PB - Elsevier Ltd. KW - Concrete KW - Ultrasound KW - Strength KW - CT PY - 2021 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/52073 AN - OPUS4-52073 SN - 0950-0618 VL - 268 SP - Paper 121124, 1 EP - 12 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany