Measurement of entrained air-void parameters in Portland cement concrete using micro X-ray computed tomography
| Autor: | Karl Peterson, Haizhu Lu, Oleksiy Chernoloz |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Void (astronomy)
Materials science Pixel 0211 other engineering and technologies Mineralogy Image processing 02 engineering and technology 021001 nanoscience & nanotechnology Durability Thresholding law.invention Portland cement Mechanics of Materials law 021105 building & construction Air entrainment Tomography 0210 nano-technology Civil and Structural Engineering |
| Zdroj: | International Journal of Pavement Engineering. 19:109-121 |
| ISSN: | 1477-268X 1029-8436 |
| DOI: | 10.1080/10298436.2016.1172705 |
| Popis: | The entrained air-void system in concrete is closely related to freeze-thaw durability in concrete pavements or other structures. For either research or forensic purposes, reliable and economical methods for the quantification of entrained air are desirable. This study explores the potential of using micro X-ray computed tomography (μCT) to measure entrained air-void parameters in concrete. A series of small cores (6 mm dia.) were retrieved from larger (100-mm-dia.) cores from two different concrete pavements, representing both adequate and marginal air contents, and scanned at a resolution of 7.5 μm/pixel. A systematic procedure based on image processing is proposed to address practical difficulties such as void/solid thresholding, air-type discernment (entrained air-voids vs. voids in aggregate) and the separation of bubbles within close proximity to each other (e.g. clustered air-voids). Air content and specific surface were measured directly from the three-dimensional (3D) reconstructed X-ray ... |
| Databáze: | OpenAIRE |
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