Analytische Chemie
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This presentation includes the results of a number of case studies of concrete properties using computed tomography (CT) in combination with various in-situ testing techniques, including those of mechanical loading, water transport, and fire. The results of these case studies demonstrate the potential of CT as an approach for obtaining unique, quantitative data about the structure of materials. This data can serve as the basis for calibrating and validating a new generation of numerical models that have a stronger foundation in micromechanical theory. This will contribute to the development of more accurate and versatile simulation approaches for concrete and other building materials.
This paper describes a novel methodology for quantitative in-situ moisture measurement without tracking agents using X-ray computed tomography (XCT). The high levels of grey-scale precision required for the measurement of moisture without tracking agents resulted in the need for an additional image calibration procedure to correct for water-related X-ray scattering and for equipment-variability related artefacts arising during in-situ testing. This calibration procedure was developed on the basis of existing principles of XCT image cor-rection. Resulting images of moisture distribution exhibit a high level of agreement with expected material behaviour. This research demonstrated that XCT can be successfully used to measure both moisture-front movement over time and changes in 3D moisture distribution within samples. This approach to moisture measurement lays the groundwork for the planned future investigation of the interaction between cracking induced by varying chemical and mechanical processes and water transport in concrete.